Abstract Introduction: Aquatic birds (AB) are usually associated with wetlands, which provide refuge, food, and/or nesting sites for resident and migratory species. Despite their ecological importance, there is little knowledge on AB in some tropical environments, such as those found on the Colima coast. Objective: To investigate the spatial and temporal composition of the AB community in Juluapan Lagoon, Colima, Central Mexican Pacific. Methods: Monthly counts were conducted between June 2017 and May 2018 during low-tide conditions to record habitat use by AB. Species richness and bird counts were obtained to compare sampling areas; mean richness and number of individuals were compared between seasons. Results: We detected 53 species and 5 750 individuals. The highest species richness and relative abundance values were obtained in winter at the lagoon area farthest from the connection with the marine system, where anthropogenic activity is lower. Diversity was greater in zones 2 and 3 in spring, summer, and fall. Muddy flats were the most used environment, and the most frequent activity was resting. Nesting activity was only recorded in the middle of the lagoon at the mangrove during spring. “Shorebirds” and “waders” were the most dominant groups in the bird community of the Juluapan lagoon. Conclusions: This coastal wetland is a site of great biological importance for aquatic birds; thus, conservation measures should be implemented, and there should be a continuous study of the effects of anthropogenic pressure.

Resumen Introducción: Las aves acuáticas (AA) son usualmente relacionadas a los humedales debido a que éstos funcionan como sitios de refugio, alimentación y anidación de diferentes especies residentes y migratorias. Sin embargo, el conocimiento sobre las aves acuáticas en algunos humedales es nulo. Objetivo: Investigar la composición espacio-temporal de la comunidad de AA en la laguna Juluapan, Colima, en el Pacífico Central Mexicano. Métodos: Entre junio de 2017 y mayo de 2018 se llevaron a cabo conteos mensuales en condiciones de marea baja para registrar el uso de hábitat de las AA. Se obtuvieron valores de riqueza de especies y número de individuos para realizar comparaciones entre zonas de muestreo, así como el promedio del número de especies y número de individuos para comparaciones entre temporadas. Resultados: Se registraron un total de 53 especies y 5 750 individuos. Los valores de riqueza de especies y densidad de individuos fueron más altos durante invierno, en la zona más alejada al ambiente marino, donde la actividad antropogénica es menor. La diversidad tuvo valores más altos en la zona 2 y 3, durante primavera, verano y otoño. El ambiente más explotado por las aves fueron las planicies lodosas; y el descanso fue la actividad más frecuente. Asimismo, la actividad de anidación sólo se registró en el manglar de la zona media durante primavera. Las “aves playeras” y “aves zancudas” fueron los grupos más predominantes en la comunidad de aves de la laguna Juluapan. Conclusiones: Este humedal costero es un sitio de gran importancia biológica para aves acuáticas, por lo que resulta necesario la implementación de medidas de conservación, así como el estudio de los efectos por la presión antropogénica.

Abstract Introduction: The Wood Thrush is a migratory bird that has experienced dramatic declines in its populations in recent decades. This species overwinters in forest fragments with intermediate levels of habitat modification in Central America. However, more studies detailing the use of remnant forests through time are needed to elucidate the threats this species faces in the wintering grounds. Objective: To understand the effects of environmental and forest structure variables on the occupancy of Wood Thrush in Northern Costa Rica. Methods: The study area was the Área de Conservación Guanacaste (ACG), located in Northern Costa Rica, in December 2016, and during the 2018-2019 migration season. We estimated Wood Thrush occupancy and detection probability in four locations of ACG (dry forest, cloud forest, and two locations in the wet forest) using single-season occupancy models. We also estimated Wood Thrush occupancy and probability of persistence in different months in three vegetation types (open area, secondary forest, and old-growth forest) in the wet forest of ACG using a multi-season occupancy model approach. Results: Wood Thrush occupancy was best described by precipitation in the four locations of the ACG; the probability of occupancy increased with precipitation. The average occupancy of Wood Thrushes varied with vegetation type: open area with shrubs and forest edge (0.69 ± 0.09), secondary forest (0.46 ± 0.1), and old-growth forest (0.61 ± 0.1). Wood Thrush probability of persistence responded partially to changes in precipitation, with an unexpected increase in persistence when the rainfall continued decreasing in the season. Conclusion: Wood Thrush occupancy was best predicted by changes in precipitation considering a larger spatial scale. Its probability of persistence partially varied with precipitation. An increase in persistence closer to Spring migration might be explained by the start of the breeding season of resident birds, potentially reducing territorial conflicts and conserving energy before migration. The long-term protection of wet forests in Northern Costa Rica is of paramount importance for the conservation of Wood Thrushes in their wintering grounds.

Resumen Introducción: El Zorzal del Bosque es un ave migratoria que ha experimentado caídas dramáticas en sus poblaciones en las últimas décadas. Esta especie pasa el invierno en fragmentos de bosque con niveles intermedios de modificación de hábitat en Centroamérica. Sin embargo, se necesitan más estudios que detallen el uso de los bosques remanentes a lo largo del tiempo para dilucidar las amenazas que enfrenta esta especie en las zonas de invernada. Objetivo: Comprender los efectos de variables ambientales y de estructura del bosque en la ocurrencia del Zorzal del Bosque en el Norte de Costa Rica. Métodos: El área de estudio fue el Área de Conservación Guanacaste (ACG), ubicada en el Norte de Costa Rica, en diciembre de 2016, y en la temporada migratoria 2018-2019. Estimamos la ocurrencia y la probabilidad de detección del Zorzal del Bosque en cuatro ubicaciones de ACG (bosque seco, bosque nuboso y dos ubicaciones en el bosque húmedo) utilizando modelos de ocurrencia de una sola temporada. También estimamos la ocurrencia del Zorzal del Bosque y la probabilidad de persistencia en diferentes meses en tres tipos de vegetación (área abierta, bosque secundario y bosque primario) en el bosque húmedo de ACG utilizando un enfoque de modelo de ocurrencia multi-estacional. Resultados: La ocurrencia del Zorzal del Bosque estuvo mejor descrita por la precipitación en las cuatro localidades del ACG; la probabilidad de ocurrencia aumentó con las precipitaciones. La ocurrencia media de zorzales varió con el tipo de vegetación: área abierta con arbustos y borde de bosque (0.69 ± 0.09), bosque secundario (0.46 ± 0.1) y bosque primario (0.61 ± 0.1). La probabilidad de persistencia del zorzal respondió parcialmente a cambios en la precipitación, con un aumento inesperado en la persistencia cuando las precipitaciones continuaron disminuyendo en la temporada. Conclusión: La ocurrecia del Zorzal del Bosque varió con la precipitación considerando una escala espacial mayor. Su probabilidad de persistencia varió parcialmente con la precipitación. Un aumento en la persistencia más cerca de la migración de primavera podría explicarse por el inicio de la temporada de reproducción de las aves residentes, lo que podría reducir los conflictos territoriales y conservar energía antes de la migración. La protección a largo plazo de los bosques húmedos en el norte de Costa Rica es de suma importancia para la conservación de los Zorzales del Bosque en sus zonas de invernada.

ABSTRACT Trees provide habitat and resources for resident and transient fauna on the cities. The choice of tree species for urban planting follows multifactorial criteria, but little consideration is given to the resources they provide. We aimed to identify functional groups of 154 native tree species indicated for urban afforestation in the municipality of São Paulo from the floral and fruiting resources made available to potential floral and fruiting visitors. We observed a proportional number of species with abiotic and biotic dispersal and a predominance of bee-pollinated tree species or fleshy fruits consumed by birds. We proposed eight functional groups characterized by sharing potential floral and frugivorous visitors that showed uneven richness. A choice focused on taxonomic identification and species size may promote high functional redundancy and impact the richness of plant-animal interactions and decrease the permeability of cities for fauna. criteria 15 beepollinated bee pollinated birds plantanimal plant animal 1

RESUMO Árvores fornecem habitat e recursos para a fauna residente e transiente nas cidades. A escolha de espécies arbóreas para plantio urbano segue critérios multifatoriais, mas pouco considera os recursos que elas disponibilizam para a fauna. Objetivamos identificar grupos funcionais de 154 espécies arbóreas nativas indicadas para plantio urbano do município de São Paulo a partir dos recursos florais e frutíferos disponibilizados para visitantes florais e frutíferos potenciais. Observamos um número proporcional de espécies com dispersão abiótica e biótica e um predomínio de espécies de arbóreas polinizadas por abelhas ou com frutos carnosos consumidos por aves. Propusemos oito grupos funcionais caracterizados pelo compartilhamento de visitantes florais e frugívoros potenciais que apresentaram uma riqueza desigual. Uma escolha focada na identificação taxonômica e porte das espécies pode promover uma alta redundância funcional e impactar a riqueza de interações planta-animal e diminuir a permeabilidade das cidades para fauna. multifatoriais 15 aves desigual plantaanimal planta animal 1

Resumen Presentamos un análisis de la diversidad y de los patrones biogeográficos de 260 especies de aves residentes de los bosques tropicales de México, realizado a partir de datos históricos (recolectados entre el siglo XVIII y 2007) y registros de presencia de la última década (2013-2023). Realizamos comparaciones del número y cambio de composición de especies, considerando las matrices de distribución “histórica” y “actual”, y un análisis de parsimonia de endemismos. De acuerdo con los datos históricos, la mayor riqueza de especies se localiza en la vertiente del Golfo de México y la península de Yucatán, mientras que los bosques estacionalmente secos de la costa del Pacífico y la Cuenca del Balsas presentaron los valores más altos de especies endémicas. Sin embargo, los datos recopilados en la última década muestran una disminución significativa del número de especies en todas las áreas analizadas. La estimación de la diversidad beta indicó valores elevados de cambio en la composición de especies para las matrices evaluadas. La hipótesis biogeográfica obtenida indica la existencia de 2 grandes grupos: i) vertiente pacífica de México y la Cuenca del Balsas y ii) norte de la provincia Veracruzana, el norte del Istmo de Tehuantepec y la península de Yucatán.

Abstract We present an analysis of diversity and biogeographic patterns of 260 resident bird species in the tropical forests of Mexico, based on historical data (collected between the 18th century and 2007) and presence records from the last decade (2013-2023). We performed comparisons of the number and composition change of species, considering the “historical” and “current” distribution matrices, and a parsimony analysis of endemicity. According to historical data, the highest species richness is located on the slope of the Gulf of Mexico and the Yucatán Peninsula, while the seasonally dry forests of the Pacific coast and the Balsas Basin presented the highest values of endemic species. However, data collected in the last decade show a significant decline in the number of species in all areas analyzed. The beta diversity estimation indicated high values of change in species composition for the matrices evaluated. Biogeographic hypothesis obtained indicates the existence of 2 main groups: i) Pacific slope of Mexico and the Balsas Basin and ii) north of the Veracruzan province, the north of the Isthmus of Tehuantepec and the Yucatán Peninsula.

ABSTRACT The Paranaguá Estuarine Complex (PEC) is internationally recognized for its economic, social, and environmental relevance. It is designated as a World Heritage site and part of selected wetland areas that protect and conserve biodiversity, especially waterbirds. However, it has historically been under pressure from human activities, and the information about waterbirds that use the region is fragmented. Thus, with this study, we sought to establish a baseline for the waterbirds using the bays of the PEC, considering aspects such as species richness, abundance, and conservation status. On board a boat, we conducted monthly surveys from March 2020 to February 2021 along 36 transects equally distributed among the three main bays of the PEC. We recorded 46 species distributed across 17 families and eight orders. The order Charadriiformes displayed the highest number of species, totaling 19. Among them, the Neotropic Cormorant, identified as Nannopterum brasilianum, stood out with the highest number of occurrences. Furthermore, we documented eight migratory species from the Northern Hemisphere, including Calidris pussilla, the Semipalmated Sandpiper, considered near threatened by the International Union for Conservation of Nature Red List. Additionally, we observed seven other species classified under some threat of extinction. Our results revealed that the PEC harbors a rich and diverse assemblage of waterbirds consisting of resident and migratory species, many of which are at some risk of population decline. Therefore, we reinforce the importance of continuous monitoring in the region, which can serve as a basis for public policies, supporting management and conservation strategies focused on waterbirds and the wetlands on which they depend. (PEC economic social relevance biodiversity However activities fragmented Thus study richness abundance status boat 202 3 4 1 orders 19 them Cormorant brasilianum occurrences Furthermore Hemisphere pussilla Sandpiper List Additionally extinction decline Therefore policies depend 20 2

Abstract. Greenspaces immersed in the large urban centers serve as shelters for biodiversity, reducing the negative impact of urbanization. To contribute to the knowledge of the avifauna of central Mexico, in the present study the bird diversity presents in the Sierra Hermosa Ecological, Tourist and Recreational State Park, a peri-urban area of the Metropolitan Area of Mexico City was determined, adjacent to the Felipe Ángeles International Airport. The data was obtained by carrying out field work over 29 months of sampling between 2019 and 2022. A total of 199 bird species were obtained, belonging to 46 families and 17 orders. The families that presented the highest species richness were Tyrannidae (19) and Parulidae (14). Ninety-two resident, 95 migratory and 12 introduced species were found. The most representative trophic group was that of insectivores (115) and the habitat with the highest species richness was abandoned buildings with induced trees (92). Three endemic species and six under some risk categories were found according to NOM-059-SEMARNAT-2010. The results indicate that is a site of great importance for feeding, shelter, and reproduction for populations of resident and migratory birds that inhabit the periphery of the urban area, and that in the local scenario could be used for future research on rehabilitation, restoration, and territorial planning in the Valley of Mexico.

Resumen. Los espacios verdes inmersos en los grandes centros urbanos sirven como refugios para la biodiversidad, reduciendo el impacto negativo que representa la urbanización. Con el objetivo de contribuir al conocimiento de la avifauna del centro de México, se determinó la diversidad de aves presente en el Parque Estatal Ecológico, Turístico y Recreativo Sierra Hermosa, que es un área periurbana de la Zona Metropolitana de la Ciudad de México, adyacente al Aeropuerto Internacional Felipe Ángeles. Los datos fueron obtenidos realizando trabajo de campo durante 29 meses de muestreo entre 2019 y 2022. Se obtuvo un total de 199 especies de aves, agrupados en 46 familias y 17 órdenes; las familias que presentaron la mayor riqueza de especies fueron Tyrannidae (19) y Parulidae (14). Se encontraron 92 especies residentes, 95 migratorias y 12 introducidas. El grupo trófico más representativo fue de los insectívoros (115) y el hábitat con mayor riqueza de especies fue las edificaciones abandonadas con arbolado inducido (92). Se hallaron tres especies endémicas y seis bajo alguna categoría de riesgo de acuerdo con la NOM-059-SEMARNAT-2010. Los resultados indican que es un sitio de gran importancia para la alimentación, refugio y reproducción para las poblaciones de aves residentes y migratorias que habitan en la periferia del área urbana, y que en el escenario local podría utilizarse para futuros estudios sobre rehabilitación, restauración y planificación territorial en el Valle de México.

Resumen Introducción: El humedal costero Poza de La Arenilla (HCPA), Callao, Perú, es un hábitat importante para el descanso y reposo de aves acuáticas, entre ellas la familia Laridae. Sin embargo, el humedal está sufriendo una degradación crítica debido al desarrollo de actividades antropogénicas. Objetivo: Evaluar la distribución espacio-temporal de las aves acuáticas de la familia Laridae reportadas en HCPA según la temporada del año entre 2013 y 2018. Métodos: Se realizaron muestreos quincenales en 11 zonas delimitadas de HCPA de enero 2013 a diciembre 2018, durante la mañana y la tarde, mediante el método de recuento total. Resultados: Se registraron 12 especies de la familia Laridae. Leucophaeus pipixcan fue la especie de mayor dominancia en la mayoría de las zonas estudiadas y su presencia se destaca en verano y primavera. Las especies con mayor distribución en el humedal son L. pipixcan, Larus dominicanus y Larus belcheri, que se registraron en todas las zonas estudiadas. La mayor abundancia total promedio de especies se registró en verano y la menor en invierno. Se observó un aumento gradual de la abundancia promedio de aves, siendo estos aumentos notables entre primavera y verano de un año a otro. Además, se observó una disminución de la riqueza global de los láridos durante el periodo evaluado. Se observó un patrón de variación estacional del índice de diversidad de Shannon-Weaver (H’) similar de un año a otro, debido a que los láridos son aves migratorias, y una tendencia a la disminución del índice con el paso del tiempo. Conclusiones: El HCPA desempeña un papel fundamental para la avifauna acuática de la región. Se ha registrado la presencia de cinco especies migratorias y siete residentes de esta familia, las cuales muestran preferencias espaciales en diferentes zonas del humedal. A pesar de que se observa una disminución en la riqueza global de las especies en el tiempo, la abundancia promedio de aves aumenta.

Abstract Introduction: The coastal wetland Poza de La Arenilla (HCPA), located in Callao (Peru), is an important resting and roosting habitat for aquatic birds, including the family Laridae. However, the wetland is suffering critical degradation due to the development of anthropogenic activities. Objective: To evaluate the spatiotemporal distribution of aquatic birds of the family Laridae reported at HCPA seasonally during the period 2013-2018. Methods: Biweekly sampling was carried out in 11 delimited zones in HCPA between January 2013 and December 2018, during morning and afternoon hours using the total count method. Results: A total of 12 species of Laridae birds were recorded. Leucophaeus pipixcan is the most dominant species in most of the studied zones and its presence is highlighted in summer and spring. The species with the greatest distribution in the wetland was L. pipixcan, Larus dominicanus, and Larus belcheri, which were reported in all the zones studied. The highest average total abundance of species was recorded in summer, while the lowest in winter. A gradual increase in the average abundance of aquatic birds was observed, with these increases being noticeable between the springs and summers from one year to the following. Also, overall richness of the larids was observed to decrease throughout the period evaluated. A similar seasonal variation pattern of the Shannon diversity index (H’) was observed from one year to the following, due the fact that Laridae are migratory, and a tendency for the index to decrease with the passage of time. Conclusions: The HCPA plays a key role for the aquatic birds of the region. The presence of five migratory and seven resident species of Laridae has been recorded, which show spatial preferences in different areas of the wetland. Despite a decrease in overall species richness over time, the average abundance of Laridae birds is increasing.

RESUMEN Objetivo. Caracterizar la avifauna presente en la granja agroecológica Ekonukos de la Corporación Universitaria Minuto de Dios, como fuente de información para la descripción y desarrollo de futuros modelos de aviturismo, educación ambiental y acciones de conservación en el área de estudio. Materiales y métodos. Se definieron cuatro zonas de acuerdo con su cobertura vegetal o uso del suelo (Zona de edificaciones o habitable-ZE, Bosque secundario BS, Zona de cultivos ZC y Pastizales o zona abierta-Pza). En cada zona se estableció un punto de observación con radio fijo, se realizaron observaciones y se practicaron recorridos mediante transectos lineales. Las especies registradas fueron identificadas y categorizadas por tipo de hábitat (ZE, BS, ZC o Pza), alimentación, frecuencia de registros y estado de amenaza o conservación. Resultados. Se encontraron 84 especies de aves, distribuidas en 18 órdenes, 34 familias y 74 géneros. El orden Passeriformes presentó la mayor riqueza de especies al igual que las familias Tyrannidae y Thraupidae. Del total de especies, 79 corresponden a poblaciones residentes, cuatro a migratorias boreales y una migratoria austral. A demás, la especie Amazona farinosa está en estado de amenaza, en la categoría NT o casi amenazada. Conclusiones. Las especies encontradas constituyen un aporte importante para el conocimiento de la avifauna local e invita a realizar acciones de restauración y manejo de la flora del sitio de estudio, con el fin de generar una mejor conectividad con las áreas cercanas y oferta alimenticia para las especies encontradas.

ABSTRACT Objective. Characterize the avifauna present in the Ekonukos agroecological farm of the Minuto de Dios University Corporation, generating base information for the description and development of future models of avitourism, environmental education and conservation actions in the study area. Materials and methods. Four zones were defined according to their vegetation cover or land use (Building or habitable zone-ZE, Secondary forest BS, ZC cultivation zone and Grasslands or open zone-Pza). In each zone an observation point with a fixed radius was established and observations were made. Additionally, tours were made using linear transects. The registered species were identified and categorized by habitat type (ZE, BS, ZC or Pza), diet, frequency of records, and threat or conservation status. Results. 84 species of birds were found, distributed in 18 orders, 34 families and 74 genera. The order Passeriformes presented the highest species richness, as did the families Tyrannidae and Thraupidae. Of the total species, 79 correspond to resident populations, four to boreal migratory and one southern migratory. On the other hand, regarding the threatened status, the farinosa Amazon species was found to be in the NT or almost threatened category. Conclusions. These results constitute an important contribution to the knowledge of local birds and invite to carry out restoration and management actions of the flora of the study site, in order to generate better connectivity with nearby areas and food supply for the species found.

Abstract The Santos Basin in eastern Brazil is adjacent to the largest human populations in the southwestern Atlantic Ocean, with several potential threats to marine vertebrates. In this study, we provided a systematic bibliographic review and integrated unpublished primary datasets to provide an overview on species, research topics and gaps, and threats to seabirds in the Santos Basin. Bibliographical sources were used for species recorded within the limits of the basin, while species census data were obtained through research and monitoring projects. We analyzed 156 studies from 1914 to 2021. An increase in the number of publications was observed from the 2000s onward (> 80%), with the state of Santa Catarina showing the highest number of publications (56%) on seabirds. Notes and Records (27%), Population and Community Structure (22%), and Fishing (11%) were the main subjects studied. Among the 76 seabird species reported in the Santos Basin (~2/3 of the species reported in Brazil), Procellariiformes was the most prevalent order (51%), including 14 species listed as threatened, either globally or nationally. Resident (28%) and long-distance migratory species, such as visitors from the Southern (39%) and Northern (17%) Hemispheres and Europe (12%), were widely recorded in the region, as well as vagrant species. The inclusion of different data sources allowed broadening the geographic cover used by species to consider both coastal (predominating in previous studies) and offshore areas. The association of seabird distribution with oceanographic and meteorological features should be addressed in future studies, as should studies on the impact of fishing and pollution on a range of common species. Ocean vertebrates study gaps basin projects 15 191 2021 s > ( 80%, 80 80% , 80%) 56% 56 (56% 27%, 27 27% (27%) 22%, 22 22% (22%) 11% 11 (11% studied 7 ~2/3 23 2 3 (~2/ Brazil, Brazil) 51%, 51 51% (51%) 1 threatened nationally 28% 28 (28% longdistance long distance 39% 39 (39% 17% 17 (17% 12%, 12 12% (12%) region predominating areas 19 202 8 5 (56 (27% (22% (11 ~2/ (~2 (51% (28 (39 (17 (12% 20 (5 (27 (22 (1 ~2 (~ (51 (2 (3 (12 ~

ABSTRACT In this study, we report the presence of a female Amblyomma americanum tick attached to a former resident of the East Coast of the United States who moved to Mexico city. The amplification and sequencing of gene fragments of the 16S-rDNA and cytochrome c oxidase subunit 1 corroborated the identification of the species of the tick. Additionally, the presence of DNA of Rickettsia amblyommatis was confirmed. This work is the first report of an exotic tick of the genus Amblyomma in a traveler from the US to Mexico and represents the second record of an imported tick attached to humans in Mexico. study city 16SrDNA SrDNA 16S rDNA S Additionally confirmed

Resumen La lechuza llanera (Athene cunicularia) se considera una especie er rante y migratoria en América Central con muy pocos informes en Honduras, El Salvador, Guatemala, Panamá, Nicaragua y Costa Rica. El 28 de noviembre de 2020 observamos un individuo de Lechu za llanera en La Ceiba, Orotina, provincia de Alajuela, Costa Rica. Este fue un registro inusual para el país, y es importante ya que no ha habido registros confirmados de la especie en Costa Rica durante 120 años. Este avistamiento también enfatiza la importancia del área como hábitat adecuado para aves migratorias y residentes, por lo que su conservación y manejo adecuado es fundamental para preservar la biodiversidad.

Abstarct The Burrowing Owl (Athene cunicularia) is considered a vagrant as well as a migratory species in Central America with very few reports in Honduras, El Salvador, Guatemala, Panama, Nicaragua, and Costa Rica. On 28 November 2020 we observed an individual Burrowing Owl at La Ceiba, Orotina, Alajuela province, Costa Rica. This was an unusual record for the country, and is of importance as there have been no confirmed records of the species in Costa Rica for 120 years. This sighting also emphasizes the importance of the area as a suitable habitat for migratory and resident birds, so its conservation and pro per management is essential to preserve biodiversity.

Migrasie speel 'n groot rol in die verspreiding van aansteeklike siektes. Tydens migrasie word die patogene van die siektes saam met die mens gedra en só na voorheen onbesmette groepe oorgedra. Selfs so lank gelede as die Uit-Afrika-migrasie het die mens twee welbekende patogene saamgedra en na die res van die wêreld versprei. Daar kan talle redes wees vir migrasie. Dit gebeur óf beplan óf spontaan. Indien migrasie deur natuurrampe, konflik, trekarbeid, slawerny of kolonisasie veroorsaak word, mag dit nadelig vir die gesondheid van migrante wees. Dit kan ook hulle vatbaarheid vir siektes verhoog, wat die verspreiding van siektes aanhelp. Reis as 'n tipe migrasie het gemaak dat die wêreld se bevolking hoogs gekonnekteer is, en dit bevorder vinnige verspreiding van siektes oor die wêreld heen. Voorbeelde van siektes wat deur migrasie versprei is, sluit in tuberkulose, Helicobacter pylorimaagsiektes, pokke, die verworwe immuniteitsgebreksindroomvirus, die Midde-Oosterse koronavirus en koronavirus tipe 1 en 2. Tydens die Holoseen het antopogeniese impakte 'n wanbalans in ekosisteme veroorsaak wat die Antroposeen ingelui het. Tydens die Neolitikum is diere gedomestiseer en sodoende is mikro-organismes van die diere na die mens oorgedra en sommige mikro-organismes, veral virusse, het siektes in mense veroorsaak, wat soönotiese siektes genoem word. In die toekoms gaan siektebeheer al hoe meer natuurbewaring insluit. Aangesien migrasie so 'n belangrike rol in die oordrag van siektes speel, gaan dit in die toekoms verpligtend word om situasies waar siektes, wat deur migrasie versprei word, deurlopend te moniteer om rampbeheerplanne betyds te implementeer. Dit is moeilik om sulke situasies te voorsien. Twee baie goeie voorbeelde hiervan is eerstens die konflik in Oekraïne sedert Maart 2022 met die inval van Rusland, en tweedens, die grootskaalse skade aan huise en infrastruktuur wat deur die die swaar reën in April 2022 in die KwaZulu-Natal Provinsie van Suid-Afrika plaasgevind het. In beide gevalle het groot getalle mense gevlug om die konflik of ramp te ontkom, en dit het mense meer vatbaar gemaak vir die oordrag van aansteeklike siektes. Rampbeheerplanne moet veral voorsiening maak vir die beskerming van die gesondheid van migrante en plaaslike gemeenskappe om die verspreiding van siektes uit te skakel.

A typifying characteristic ofHomo sapiens is its ability to walk upright, which allowed humans to move about in grasslands, enabling them to leave the forests of central Africa and populate the rest of Africa and later the world, a success story like no other. Africa is the place of origin of Homo sapiens. The first major migration of anatomically modern humans, known as the Out-of-Africa migration, was the first of many migratory events of Homo sapiens that continue up to the current era that shaped the world and society. This article aims to describe the defining role of human migration in spreading infectious diseases from pre-history to the present. In future, infectious diseases will continue to spread through migration. However, by contrast, the spread of diseases will be exacerbated due to the opportunities provided in the Anthropocene epoch and will become progressively more challenging. Migration is a term that encompasses the simultaneous movement of large numbers or groups of people away from their original place of living and for a specific reason. The main reasons for migration are emigration/immigration, forced displacement, slavery, migrant labour, asylum seeking and refugees. In addition, war, conflict, and environmental disasters such as droughts, famine and overpopulation are other common causes of migration. Migration is usually unplanned; it happens without warning or advanced planning and is accompanied by a large-scale disruption in the socio-economic structure, health, and well-being of the migrants and/or other affected groups. Such major disruptions to individuals' normal living can weaken the immune system, leading to increased susceptibility to infectious diseases. In addition, temporary housing during migration can often also result in humanitarian disasters that increase opportunities for the transmission of infectious diseases. Migrants are also at risk of contracting new or previously-unencountered diseases prevalent in their chosen resettlement area. Conversely, migrants can carry with them microorganisms absent in the resettlement area. An example of this is the smallpox virus that was brought to South America by the Spanish colonisers. At that stage, poxvirus was absent in this continent, and the indigenous populations had no immunity to the pathogen. The transmission of the poxvirus by colonizers to indigenous populations almost destroyed the indigenous populations of the time. A form of migration that emerged more recently is travel. Travel migration is defined as the large number of unrelated individuals who travel simultaneously across the globe for work or pleasure. Travel migration has been enabled by advances in the speed by which air and train travel takes place. This results in large numbers of individuals being transported across the globe in a short period and over long distances. Travel by water, air and land resulted in the world's population being highly interconnected through the mingling of large numbers of people from geographically remote places but in a relatively short period. Travelling connects people and diseases across the globe. Examples of pathogens that spread through migration and that cause major infectious diseases include the smallpox virus, the human immuno-deficiency virus (HIV), and coronaviruses that cause Middle Eastern respiratory syndrome (MERS), coronavirus disease 2019 (COVID-19) and severe acute respiratory syndrome (SARS). Mycobacterium tuberculosis, the cause of tuberculosis, and Helicobacter pylori, which can cause gastric ulcers, are among the oldest known bacteria that infect humans and were already present in humans when the Out-of-Africa migration occurred. These two pathogens were carried with humans as they migrated and populated new areas of the world, and both have been present in large numbers of humans over millennia. These two organisms can only spread through very close contact between humans and have no host outside the body; therefore, they are great examples of how migration distributes infectious diseases across the world. Mycobacterium tuberculosis is exceptionally well-adapted to spread and cause disease among individuals with lower immunity, such as migrants. Poor housing conditions and crowding, which invariably result from migration due to humanitarian disasters, advance the transmission of pathogens such as tuberculosis. Major lifestyle changes of humans occurred from the Paleolithic to the Neolithic after the Out-of-Africa migration, which directly or indirectly benefited the transmission of diseases. During the Neolithic, animals were domesticated, and agriculture started, allowing people to settle down and establishing the first towns and cities. The domestication of animals created an opportunity for pathogens to cross from animals to humans and adapt to the new host to cause new infectious diseases in humans, called zoonosis. The Anthropocene dawned when deforestation, mining, farming, and other human activities left their mark. As a result, the Anthropocene offers unique opportunities for the emergence and spread of infectious diseases: firstly, by zoonosis or the transmission of diseases from animals to humans, and secondly, the spread of the diseases through migration. Furthermore, changes in the weather and climate can lead to environmental migration. This occurs when people need to abandon their normal place of living because of severe weather events such as droughts and ice ages. Labour migration was responsible for the spread of HIV from its place of origin in Africa. This virus initially landed in humans through inter-species cross-over from primates to humans in the 1950s from eating semi-cooked bush meat. As a result, it became established in the indigenous populations of Africa. HIV is a sexually transmitted disease amongst humans, and migratory labourers from Haiti were infected with the virus while working in the Congo, where they transmitted the virus to people in Haiti upon their return. The MERS and SARS coronaviruses became human pathogens due to bat-human species cross-over, probably due to eating bush meat. However, the rapid distribution of these two viruses to other areas of the world was enabled through travel migration and the highly connected world population. Similarly, the extremely rapid spread of severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) upon its discovery in December 2019 was partly due to travel migration. In future, the negative impact of infectious diseases can be prevented by having disaster preparedness plans to protect the health and well-being of migrants and resident populations. However, events that can potentially be disastrous are difficult to pre-empt: the world was largely unprepared on how to respond to the rapid spread of SARS-CoV-2 and how to control the ensuing pandemic. Other recent examples of similar unforeseen events are the Ukraine-Russian conflict that started in March 2022, which caused many people from Ukraine to flee to other countries for safety. The second example is the heavy rain of April 2022 in the KwaZulu-Natal Province of South Africa, which caused massive destruction of houses and infrastructure, resulting in affected people being displaced. In both cases, the reasons for migration can have a detrimental impact on the health of the affected people, which renders them susceptible to disease transmission.

Abstract The systemic effects of oxygen deficiency or excess are not thoroughly described. Knowledge is evolving towards the description of beneficial and detrimental effects of both extremes of partial pressure of oxygen (PaO2). The cellular and tissue mediators derived from the modulation of the oxidative tone and the production of reactive oxygen species (ROS) are widely characterized biochemically, but the pathophysiological characterization is lacking. Preclinical models support the use of hypobaric hypoxia preconditioning, based on its beneficial effects on ventricular function or its reduction in infarct size. A very important use of oxygen today is in commercial diving. However, novel clinical indications for oxygen such as the healing of diabetic foot ulcers and bone injury caused by radiotherapy are increasingly used. On the other hand, the modulation of the hypoxic response associated with exposure to high altitude environments (hypobaric), favors Chile and its highlands as a natural laboratory to determine certain cardiovascular, cerebral and metabolic responses in the resident population. Also, the consequences of the intermittent exposure to high altitudes in workers also deserves attention. This review discusses the physiopathological response to hypo and hyperoxemia, associated with environments with different oxygen concentrations, and brings back the concept of oxygen as a pharmacological mediator in extreme environments such as high altitudes and hyperbaric medicine in divers, decompression sickness, osteonecrosis associated with radiotherapy and sudden sensorineural hearing loss.

RESUMEN A pesar de que la muda constituye una actividad importante y costosa en el ciclo de vida de aves, este proceso es poco conocido en especies neotropicales y lo es aún menos para especies que habitan ambientes urbanos. Estudiamos los patrones de muda, criterios de determinación de edad y sexo y datos mor-fométricos correspondientes a siete especies de aves residentes comunes en un área urbana de la ciudad de Lima, Perú. Todas las especies evidenciaron muda prebásica completa. Mudas preformativa parcial a incompleta excéntrica fueron evidenciadas para Camptostoma obsoletum, Pyrocephalus rubinus, Cata-mema analis, Poospiza hispaniolensis, Coereba flaveola y Thraupis episcopus; mientras que Columbina cruziana evidenció una muda completa. Todos los traúpidos exhibieron mudas prealterna parcial. Las mudas preformativa y prebásica fueron registradas principalmente durante la temporada seca, y los pocos registros de muda prealterna sugieren su ocurrencia poco después de la temporada húmeda. Nuestras especies también exhibieron una baja sincronía de muda, y algunas de ellas (C. cruziana, P. rubinus y C. flaveola) exhibieron períodos extensos de muda probablemente explicados por su potencial para reproducirse durante el año o la existencia de mudas suspendida / prolongada. El análisis morfométrico evidenció diferencias significativas según sexo para C. cruziana, P. rubinus y C. analis, siendo la cuerda alar la característica más común para distinguir sexos. Nuestro estudio cubre un vacío importante en conocimiento de la historia natural de aves urbanas y proporciona información para probar hipótesis sobre la variación de patrones de muda en especies con amplia distribución en las Américas.

ABSTRACT Despite molting is an important and expensive activity in the life cycle of birds, this process is poorly known for neotropical species and even less so for species inhabiting urban zones. We studied molt patterns, aging and sexing criteria, and morphometrics for seven common resident species in an urban area of Lima city, Peru. All species evidenced complete prebasic molts. Partial to eccentric incomplete preformative molts were evidenced for six species (Camptostoma obsoletum, Pyrocephalus rubinus, Catamenia analis, Poospiza hispaniolensis, Coereba flaveola, and Thraupis episcopus); whereas Columbina cruziana exhibited a complete molt. All thraupid species exhibited partial prealternate molts. Preformative and prebasic molts were recorded mostly during the dry season, and the few records of prealternate molts might suggest its occurrence soon after the wet season. Our species also exhibited low molt synchrony, with some of them (C. cruziana, P. rubinus, and C. flaveola) exhibiting extensive molt periods likely explained by its potential to reproduce throughout the year and/or the existence of suspended/ protracted molts. Morphometric analysis evidenced significant differences according to sex for C. cruziana, P. rubinus, and C. analis, with the wing chord being the most common characteristic for distinguishing between sexes. Our study covers an important gap in the knowledge of the natural history of urban birds and provides information to test hypotheses of molt pattern variation on species with widespread distribution throughout the Americas.

ABSTRACT Mycoplasma haemofelis is the most pathogenic haemotropic species that affects felines by parasitizing red blood cells and inducing a haemolytic process that can lead to anaemia. The present study aimed to determine the prevalence of this infection in domestic felines from the city of Pereira, Risaralda, Colombia. Samples from 104 domestic felines between 1 and 10 years of age were analysed. Blood samples were taken for cytological (haematological parameters) and molecular analysis by PCR. Additionally, the possible risk factors associated with the presence of M. haemofelis (age, sex, vaccination status and geographical area of origin) were evaluated. The prevalence by molecular analysis was 80.8%, while it was 80.7% with the Giemsa stain and 81.7% with the Wright stain, and the youngest animals (1-2 years) being the most affected. A significant statistical correlation (p=0.0038) of age with the infection was evidenced as an associated risk factor in this area of the country.

RESUMEN Mycoplasma haemofelis es la especie hemotrópica más patogénica que afecta a los felinos parasitando los glóbulos rojos e induciéndoles un proceso hemolítico que puede terminar en anemia. El presente estudio tuvo como objetivo determinar la prevalencia de dicha infección en felinos domésticos de la ciudad de Pereira, Risaralda, Colombia. Se analizaron las muestras de 104 felinos domésticos entre 1 y 10 años de edad. Se tomaron muestras de sangre para el análisis citológico (parámetros hematológicos) y molecular por PCR. Adicionalmente se evaluaron los posibles factores de riesgo asociados con la presencia de M. haemofelis (edad, sexo, estado de vacunación y zona geográfica de procedencia). La prevalencia mediante el análisis molecular fue de 80.8%, en tanto que con la coloración de Giemsa fue de 80.7% y con Wright de 81.7%, siendo los animales más jóvenes (1-2 años) los más afectados. Se evidenció una correlación estadística significativa (p=0.0038) de la edad con la infección como un factor de riesgo asociado en esta zona del país.