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Population ecology of a critically endangered gecko, endemic to north-eastern of Argentina
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COURTIS, AZUL

; CAJADE, RODRIGO

; PIÑEIRO, JOSÉ MIGUEL

; HERNANDO, ALEJANDRA

; SANTORO, SIMONE

; MARANGONI, FEDERICO

Anais da Academia Brasileira de Ciências

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2022, Volume 94 Suppl. 4 elocation e20200388

Abstract: En | Text: En | PDF: En

Abstract Homonota taragui is an endemic gecko of the northeast of Argentina. We estimate demographic parameters: number of individuals by populations, sex and ontogenetic stage; sexual dimorphism; survival of this species; and describe the use of microhabitat and movement patterns. We measured 11 morphological variables, determined the sex and marked individually. We found bigger head width in males. Some factors contribute to the vulnerability of this species such as its constrained geographical distribution, use of the specific microhabitat and the isolation of their populations. We highlight demography studies as an essential data source for management and conservation of critically endangered species.

https://doi.org/10.1590/0001-3765202220200388

Bat (Mammalia: Chiroptera) biodiversity in a subtropical inselberg ecosystem of Northeastern Argentina
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Argoitia, María-A.

; Cajade, Rodrigo

; Hernando, Alejandra-B.

; Teta, Pablo

Revista de Biología Tropical

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jun 2021, Volume 69 N. 2 Pages 379 - 390

Abstract: Es En | Text: Es En | PDF: Es | PDF: En

Resumen Introducción: Los afloramientos rocosos influyen tanto en el micro como en el macro hábitat de plantas y animales al incrementar la disponibilidad de alimentos, proporcionar refugios y brindar condiciones microclimáticas únicas. Objetivo: Describir el ensamble de murciélagos en tres afloramientos rocosos aislados y sus pendientes circundantes, incorporando nuevos datos sobre gremios tróficos y refugios. Métodos: Muestreamos la fauna de murciélagos del Paraje Tres Cerros, provincia de Corrientes, Argentina, exploramos 13 sitios durante 26 viajes de campo, usando redes de niebla y búsqueda de refugios. Realizamos una curva de acumulación de especies y calculamos la completitud del inventario. La similitud y composición de diferentes hábitats se comparó mediante un escalado multidimensional no métrico (NMDS) y una prueba ANOSIM. Resultados: Reportamos 13 especies, con una completitud del 80 % del inventario (Jacknife1), correspondientes a las familias Vespertilionidae, Molossidae y Phyllostomidae. Los gremios mejor representados fueron los insectívoros. Encontramos nueve tipos de refugios para ocho especies en diferentes sitios. Los análisis expresaron bajas diferencias en la composición de especies entre ambos tipos de hábitats en el área. Conclusión: Los afloramientos rocosos y pendientes son ecosistemas importantes para la conservación y diversidad de los murciélagos en la región, ya que sus comunidades son regionalmente únicas.

Abstract Introduction: Rocky outcrops influence both micro and macro habitat for plants and animals by increasing the availability and predictability of food, providing shelter, and unique microclimatic conditions. Objective: We describe the bat assemblage in three isolated rocky outcrops and their surrounding pediments, adding new data about trophic guilds and roosts. Methods: We surveyed the bat fauna of Paraje Tres Cerros, Corrientes Province, Argentina, exploring 13 sites during 26 field trips, using mist nets and search of roosts. We made an accumulation species curve and calculate inventory completeness. The similarity and composition of different habitats was compared by a Non-Metric Multidimensional Scaling (NMDS) and an ANOSIM test. Results: We reported 13 species, with a completeness inventory of the 80 % (Jacknife1), corresponding to the families Vespertilionidae, Molossidae and Phyllostomidae. The insectivorous bats were the best represented guild. We found nine types of roost for eight species in different sites. The analysis expressed low differences in the species composition between both types of habitats in the area. Conclusions: The rocky outcrops and their pediments are important ecosystems for the conservation and diversity of the bats in the region, since their assemblages are regionally unique.

https://doi.org/10.15517/rbt.v69i2.42815

The isolated rocky outcrops of northeastern Argentina and their role on the herpetofauna conservation
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PIÑEIRO, JOSÉ M.

; CAJADE, RODRIGO

; HERNANDO, ALEJANDRA B.

; COURTIS, AZUL

; INGARAMO, MARÍA R.

; MARANGONI, FEDERICO

Anais da Academia Brasileira de Ciências

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2021, Volume 93 N. 2 elocation e20190932

Abstract: En | Text: En | PDF: En

Abstract Isolated rocky outcrops represent biodiversity centers, refuges for endangered species, and favorable scenarios for endemism. Most studies in these ecosystems have been focused mainly on their flora and secondarily on different groups of animals. To highlight the value of rocky outcrops as ecosystems for biodiversity conservation, in the present study, we describe the diversity of herptiles of three isolated rocky outcrops of northeastern Argentina and compare it with that of other natural areas of the region. We conducted fieldwork from September 2010 to March 2017. We calculated the alpha diversity and the number of rare, threatened and endemic species. For comparative diversity analysis, we calculated the importance of each area for amphibians and reptiles and the beta diversity. Were recorded a total of 56 species (23 amphibians and 33 reptiles), representing 35% of the herptiles recorded for Corrientes province. These species included 19 rare species, seven threatened species, and two endemic species. The overall beta diversity showed considerably differences in species composition between the compared areas. The rocky outcrops showed higher importance for amphibians and reptiles than the other areas studied. Our study contributes to the knowledge of rocky outcrops and highlights their importance in biodiversity conservation.

https://doi.org/10.1590/0001-3765202120190932 122 downloads

ALEXANDER VON HUMBOLDT Y AMADO BONPLAND: SU LEGADO EN LA REVALORACIÓN DE LA HISTORIA NATURAL
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Cajade, Rodrigo

; Hernando, Alejandra B.

Bonplandia

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dec 2020, Volume 29 N. 2 Pages 141 - 153

Abstract: En Es | Text: En Es | PDF: En | PDF: Es

Summary Natural History (NH) is a relevant discipline of the Natural Sciences that describes organisms in their environment from accurate observation. As the mother of Western sciences, its origin dates back to Aristotle’s writings. Since then it crossed human history providing essential knowledge for humanity development. After flourishing between the 17th and 19th centuries due to the exploratory travels of European naturalists to the new continents, NH has lost appreciation in its contribution to scientific knowledge. The debate about its role in sciences has swung like a pendulum between estimation and dismissal. In this contribution, we present the main themes of this debate. We expose our point of view from our experience that revalues the history of NH under the influence of Alexander von Humboldt and Amado Bonpland´ works. The specialization of sciences, technological advances, the loss of the naturalistic sense, and the connection with romanticism have been among, the main causes that have discredited NH. However, we conclude that history shows us that NH has been and is fundamental for the growth and development of humanity.

Resumen La Historia Natural (HN) es una disciplina relevante de las Ciencias Naturales que se encarga de describir a los seres vivos y su ambiente a partir de la observación precisa. Como madre de las ciencias occidentales, sus orígenes se remontan a los escritos de Aristóteles, para atravesar desde entonces la historia de la humanidad brindando conocimientos esenciales para su desarrollo. Luego de su auge entre los siglos XVII y XIX con los viajes exploratorios de los naturalistas europeos a los nuevos continentes, la HN ha perdido valoración en el aporte a la construcción del conocimiento científico. Desde entonces el debate sobre el rol de la HN en las ciencias ha oscilado como un péndulo entre su estimación y desestimación. En esta contribución, presentamos los principales temas de este debate aportando nuestro punto de vista a partir de nuestra experiencia en la revaloración de la historia de la HN, resignificada con la influencia de la obra de Alexander von Humboldt y Amado Bonpland. La especialización de las ciencias, los avances tecnológicos, la pérdida del sentido naturalista y la vinculación con el romanticismo han sido, entre otras, las principales causas que han desacreditado a la HN. Sin embargo, concluimos que la historia nos muestra que la HN ha sido y es fundamental para el crecimiento y desarrollo de la humanidad.

https://doi.org/10.30972/bon.2914430. 378 downloads

Behavioral and morphological contrasts on the reproduction of two prolonged breeders of the genus Physalaemus (Anura: Leptodactylidae)
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CAJADE, RODRIGO

; GARCÍA, MIRTA L.

; DI PIETRO, DIEGO O.

; BASSO, NÉSTOR G.

Anais da Academia Brasileira de Ciências

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2020, Volume 92 elocation e20180773

Abstract: En | Text: En | PDF: En

Abstract The reproduction is one of the main events in the life of an organism, and anurans stand out among vertebrates because of the diversity of their reproductive strategies. We studied the reproduction of two syntopic species, Physalaemus aff. albonotatus and P. santafecinus, and comparatively described their reproductive activity pattern, advertisement calls, calling sites, daily calling activity, amplexus behavior, foam nests, and microhabitats in foam nests. In regards to the reproductive activity pattern, both species were defined as prolonged breeders. However, P. santafecinus exhibited a behavior like explosive breeders: it had a faster reproductive response against rains than P. aff. albonotatus. The calling activity was restricted exclusively to night hours in P. santafecinus, whereas P. aff. albonotatus called during both night and day. The advertisement calls of both species showed a rich harmonic structure, and were characterized by a bimodal harmonic dominance. The species differed significantly in microhabitat calling sites, foam nests, and microhabitats in foam nests. Namely, P. santafecinus frequently called and constructed its nests in sites more exposed than those of P. aff. albonotatus. The general differences in reproductive behaviors observed between the species principally agree with their different reproductive activity patterns.

https://doi.org/10.1590/0001-3765202020180773 520 downloads

Biochemical characterization and cytotoxic effect of the skin secretion from the red-spotted Argentina frog Argenteohyla siemersi (Anura: Hylidae)
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Fusco, Luciano S.

; Cajade, Rodrigo

; Piñeiro, Jose M.

; Torres, Ana M.

; Silva, Igor R. F. da

; Hyslop, Stephen

; Leiva, Laura C.

; Pimenta, Daniel C.

; Bustillo, Soledad

Journal of Venomous Animals and Toxins including Tropical Diseases

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2020, Volume 26 elocation e20190078

Abstract: En | Text: En | PDF: En

Abstract Background: Argenteohyla siemersi (red-spotted Argentina frog) is a casque-headed tree frog species belonging to the Hylidae family. This species has a complex combination of anti-predator defense mechanisms that include a highly lethal skin secretion. However, biochemical composition and biological effects of this secretion have not yet been studied. Methods: The A. siemersi skin secretion samples were analyzed by mass spectrometry and chromatographic analysis (MALDI-TOF/MS, RP-HPLC and GC-MS). Proteins were also studied by SDS-PAGE. Among the biological activities evaluated, several enzymatic activities (hemolytic, phospholipase A2, clotting, proteolytic and amidolytic) were assessed. Furthermore, the cytotoxic activity (cytolysis and fluorescence staining) was evaluated on myoblasts of the C2C12 cell line. Results: The MALDI-TOF/MS analysis identified polypeptides and proteins in the aqueous solution of A. siemersi skin secretion. SDS-PAGE revealed the presence of proteins with molecular masses from 15 to 55 kDa. Steroids, but no alkaloids or peptides (less than 5 KDa), were detected using mass spectrometry. Skin secretion revealed the presence of lipids in methanolic extract, as analyzed by CG-MS. This secretion showed hemolytic and phospholipase A2 activities, but was devoid of amidolytic, proteolytic or clotting activities. Moreover, dose-dependent cytotoxicity in cultured C2C12 myoblasts of the skin secretion was demonstrated. Morphological analysis, quantification of lactate dehydrogenase release and fluorescence staining indicated that the cell death triggered by this secretion involved necrosis. Conclusions: Results presented herein evidence the biochemical composition and biological effects of A. siemersi skin secretion and contribute to the knowledge on the defense mechanisms of casque-headed frogs.

https://doi.org/10.1590/1678-9199-jvatitd-2019-0078 1203 downloads

Resource partitioning in a snake assemblage from east-central Argentina
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DI PIETRO, DIEGO O.

; WILLIAMS, JORGE D.

; CABRERA, MARIO R.

; ALCALDE, LEANDRO

; CAJADE, RODRIGO

; KACOLIRIS, FEDERICO P.

Anais da Academia Brasileira de Ciências

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2020, Volume 92 N. 2 elocation e20180766

Abstract: En | Text: En | PDF: En

Abstract Two dimensions of the ecological niche (diet and habitat) of a snake assemblage from an endemic rich area in east-central Argentina, the Sierras de Ventania mountain chain, were analyzed. Field data collection was performed in 15-week study periods between 2010 and 2014. Snakes were hand-captured using transect surveys. Field observations on diet were analyzed together with stomach content data from museum specimens. Our results supported the partitioning of the snake assemblage by both habitat use and diet into at least three functional groups: species restricted to microhabitats under rocks and with a diet composed exclusively of ants (Epictia australis); species found mostly in stream microhabitats and feeding mainly upon anurans (Erythrolamprus poecilogyrus and Lygophis elegantissimus); and species found mostly in grassland microhabitats, with specialized diets of terrestrial prey items (Philodryas patagoniensis and Bothrops alternatus). Consistent with previous work, diet was more important than habitat in explaining ecological niche partitioning of this snake assemblage. Our results showed that high overlap values of microhabitat use were compensated by low overlap values of the trophic niche dimension, thus matching the traditional complementary niches hypothesis.

https://doi.org/10.1590/0001-3765202020180766 1135 downloads

Contrasting life-histories in two syntopic amphibians of the Leptodactylus fuscus group (Heyer 1978)
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MARANGONI, FEDERICO

; COURTIS, AZUL

; PIÑEIRO, JOSE M.

; INGARAMO, MARÍA DEL ROSARIO

; CAJADE, RODRIGO

; STĂNESCU, FLORINA

Anais da Academia Brasileira de Ciências

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2019, Volume 91 N. 3 elocation e20180507

Abstract: En | Text: En | PDF: En

Abstract Abstract: We used skeletochronology to compare age, size, reproductive parameters and growth patterns of two related, anuran amphibians from Northern Argentina: Leptodactylus bufonius(n=69) andL. latinasus(n=56), in order to better understand their coexistence in syntopy. Previous studies showed that the two species overlap in their dietary requirements and utilize the same habitats for feeding and breeding. We found that their life-history patterns are significantly different,L. bufoniusbeing larger, and having a higher reproductive output and lifespan, compared to the smaller and shorter-livingL. latinasus. Since none of the species exhibited sexual size dimorphism, and both acquired sexual maturity after the first year of life, we suggest that the differences in the observed life-history parameters must appear during early stages of development, during larval and/or juvenile stages.

https://doi.org/10.1590/0001-3675201920180507 834 downloads

Comunidades de aves de bosques y pastizales en los afloramientos rocosos aislados del Paraje Tres Cerros, Corrientes, Argentina
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Fandiño, Blas

; Fernández, Juan Manuel

; Thomann, María Luz

; Cajade, Rodrigo

; Hernando, Alejandra Beatriz

Revista de Biología Tropical

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jun 2017, Volume 65 N. 2 Pages 535 - 550

Abstract: Es En | Text: Es En | PDF: Es | PDF: En

ResumenLos afloramientos rocosos aislados se describen como paisajes destacados en biodiversidad debido a la gran variedad de microhabitats, presencia de taxones restringidos y al alto recambio de especies con la matriz circundante. Particularmente los afloramientos rocosos aislados del Paraje Tres Cerros (ARPTC), Corrientes, Argentina, representan un paisaje único en la región, biológicamente fueron poco explorados. Se estudió la comunidad de aves de bosques y pastizales de los ARPTC mediante 136 listas de Mackinnon de diez especies durante la temporada reproductiva y no reproductiva. Se evaluó la diversidad, riqueza estimada y completitud de inventarios, abundancia de gremios tróficos y fenología de las especies. Se comparó estos atributos entre los bosques y pastizales. Se registraron 107 especies donde el bosque es 1.3 veces más diverso que el pastizal. La completitud de inventarios varió de 83 a 90 % en el pastizal y de 88 a 99 % en el bosque. Los hábitats se complementaron en un 62 % indicando una elevada ocurrencia de especies exclusivas. Las aves insectívoras fueron abundantes en ambos ambientes, mientras que las frugívoras en bosques y las granívoras en pastizales. Ambos hábitats son significativamente más ricos en especies en la estación reproductiva por la llegada de los migrantes estivales. Los resultados concuerdan con los patrones generales conocidos para las comunidades de aves y con otros específicos para las comunidades de aves de afloramientos rocosos. El presente estudio resalta la importancia de los afloramientos rocosos aislados de Paraje Tres Cerros para la protección de la biodiversidad de aves a nivel local y regional y representa una herramienta de manejo para la conservación de estos ecosistemas.

AbstractIsolated rocky outcrops can act as patch habitats that host great biodiversity through the diversity of microhabitats, presence of restricted taxa and the high turnover of species in the patch matrix. The isolated rocky outcrops of Paraje Tres Cerros (ARPTC), Corrientes, Argentina, are a unique landscape in the region and biologically little explored. We conducted a study to describe for the first time the bird community of the forest and grassland of the ARPTC, using 136 lists following the ten species Mackinnon method from the breeding and non-breeding seasons. We evaluated the diversity, trophic guilds and phenology of the species, and compared attributes of grassland and forest communities. The total species richness was 107, with the forest being 1.3 times more diverse than the grassland. Completeness of inventories ranged from 83-90 % in the grassland and 88 to 99 % in the forest. The habitat complementarity was 62 %, indicating the presence of several species exclusive of forest and grassland habitats. The trophic structure of communities showed a good representation of insectivorous birds in both habitats. Frugivorous birds were more frequent in the forest and granivorous birds were more frequent in the grasslands. Due to the arrival of migrant species, both habitats had significantly higher richness in the breeding season than in the non-breeding season. Our results showed similar general aspects and patterns for bird communities and with specific studies for bird communities of rocky outcrops. The present study highlights the importance of the isolated rocky outcrops of Paraje Tres Cerros for the protection of local and regional bird biodiversity and represents a benchmark for the management and the protection of these ecosystems.

https://doi.org/10.15517/rbt.v65i2.24408 1230 downloads

10.

Herpetofauna de la Reserva Paleontológica del Arroyo Toropí, Bella Vista, Corrientes, Argentina
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Ingaramo, María del Rosario

; Marangoni, Federico

; Cajade, Rodrigo

Cuadernos de herpetología

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may 2015, Volume 29 N. 1 Pages 69 - 75

Abstract: Es | Text: Es | PDF: Es

425 downloads

11.

Depredación de Erythrolamprus poecilogyrus (Serpentes: Dypsadidae) por Lethocerus annulipes (Heteroptera: Belostomatidae)
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Piñeiro, José Miguel

; Cajade, Rodrigo

; Ingaramo, María del Rosario

; Marangoni, Federico

Cuadernos de herpetología

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may 2015, Volume 29 N. 1 Pages 87 - 89

Abstract: Es | Text: Es | PDF: Es

235 downloads

12.

Confirmación de la presencia de Phrynops geoffroanus (Schweigger, 1812) (Testudines, Chelidae) en la provincia de Misiones, Argentina
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Cajade, Rodrigo

; Marangoni, Federico

; Piñeiro, José Miguel

; Álvarez, Blanca B

Cuadernos de herpetología

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sep 2014, Volume 28 N. 2 Pages 165 - 167

Abstract: Es | Text: Es | PDF: Es

195 downloads

13.

Categorización del estado de conservación de los anfibios de la República Argentina
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Vaira, Marcos

; Akmentins, Mauricio

; Attademo, Maximiliano

; Baldo, Diego

; Barrasso, Diego

; Barrionuevo, Sebastián

; Basso, Néstor

; Blotto, Boris

; Cairo, Samanta

; Cajade, Rodrigo

; Céspedez, Jorge

; Corbalán, Valeria

; Chilote, Paula

; Duré, Marta

; Falcione, Camila

; Ferraro, Daiana

; Gutierrez, F. Romina

; Ingaramo, Maria del Rosario

; Junges, Celina

; Lajmanovich, Rafael

; Lescano, Julián N.

; Marangoni, Federico

; Martinazzo, Liza

; Marti, Romina

; Moreno, Liliana

; Natale, Guillermo Sebastián

; Pérez Iglesias, Juan Manuel

; Peltzer, Paola

; Quiroga, Lorena

; Rosset, Sergio

; Sanabria, Eduardo

; Sanchez, Laura

; Schaefer, Eduardo

; Úbeda, Carmen

; Zaracho, Víctor

Cuadernos de herpetología

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dec 2012, Volume 26 Suppl. 1 Pages 131 - 159

Abstract: En Es | Text: En Es | PDF: En | PDF: Es

More than a decade after the first red list of herpetofauna proposed by the Asociación Herpetológica Argentina (Lavilla et al., 2000), we recategorized amphibians based on new taxonomic, biogeographical, bio-ecological information and methodological changes in the former evaluation. Through the participation of 35 specialists from all over Argentina 175 taxa of amphibians (171 in the previous categorization) are reevaluated including 23 new taxa added to Argentina, obtaining as results the inclusion of 51 Red List species (8 Endangered, 11 Threatened, 32 Vulnerable), 21 Insufficiently Known and 103 Not Threatened. In relation to the former categorization of the AHA the changes were: one taxon descended from Critically Endangered to Endangered, seven taxa descended from Endangered or Vulnerable to Insufficiently Known, and nine from Insufficiently Known to Not Threatened. Three Not Threatened and 10 Insufficiently Known were elevated to different categories of threat, nine taxa were elevated from Endangered to Vulnerable, five from Vulnerable to Endangered, and one from Threatened was elevated to Critically Endangered. Of 23 taxa not evaluated in 2000, 16 are placed as Not Threatened, three Vulnerable, and four Insufficiently Known. These changes are the result of: (1) more available information for evaluation from systematic, biogeography and bio-ecology, (2) changes in human pressures over the species or over their habitats, (3) methodological changes that included recommendations for applying concepts, discussion and consensus among experts and analysis of uncertainties.

A más de una década de la primera Lista Roja de herpetofauna propuesta por la Asociación Herpetológica Argentina (Lavilla et al., 2000), se recategorizaron los anfibios a partir de nueva información taxonómica, biogeográfica, bio-ecológica y de modificaciones metodológicas respecto a la evaluación anterior. Mediante la participación de 35 especialistas de toda la Argentina se reevaluaron 175 taxones de anfibios (171 en la anterior) incluyendo 23 taxones nuevos para Argentina y obteniéndose como resultado la inclusión de 51 especies en la Lista Roja (8 En Peligro, 11 Amenazadas, 32 Vulnerables), 21 Insuficientemente Conocidas y 103 No Amenazadas. En relación con la categorización anterior de la AHA, los cambios de categorías han sido: un taxón descendió de las categorías En Peligro a Amenazado, siete taxones descendieron de Amenazados o Vulnerables a Insuficientemente Conocidos y nueve de Insuficientemente Conocidos a No Amenazados. Tres No Amenazados y 10 Insuficientemente Conocidos fueron elevados a distintas categorías de amenaza, nueve taxones Vulnerables fueron elevados a Amenazados, cinco de Vulnerables a En Peligro, y un taxón fue elevado de Amenazado a En Peligro. De 23 taxones no evaluados en el 2000, 16 se ubican en la categoría No Amenazados, tres en Insuficientemente Conocidos y cuatro en Vulnerables. Estas modificaciones son el resultado de: (1) mayor información sistemática, biogeográfica y bio-ecológica disponible para la evaluación, (2) cambios en cuanto a las presiones antrópicas sobre las especies o sus hábitats, (3) modificaciones metodológicas que incluyeron instructivos para aplicar los conceptos, la discusión y consenso entre especialistas y el análisis de las incertidumbres.

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14.

Trophic and microhabitat niche overlap in two sympatric dendrobatids from La Selva, Costa Rica
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Cajade, Rodrigo

; Schaefer, Eduardo Federico

; Duré, Marta Inés

; Kehr, Arturo Ignacio

Cuadernos de herpetología

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dec 2010, Volume 24 N. 2 Pages 81 - 92

Abstract: En Es | Text: En Es | PDF: En | PDF: Es

We studied the trophic ecology of Dendrobates auratus and Oophaga pumilio in La Selva Biological Station, Costa Rica. At this site, both dendrobatids are sympatric due to the introduction and naturalization of D. auratus in the last 24 years. Diets of both dendrobatids were recorded by the analysed stomach flushing technique. Microhabitats uses were defined as the site where each individual was captured. The influence of microhabitat on diets was evaluated by the dietary (prey proportions and volume) and microhabitat overlaps using Pianka's (Ojk) overlap index calculated with EcoSim software. Diets of both dendrobatids were principally characterized by the preference of hymenopterans (ants), acarines and collembolans, resulted in a high overlapping in prey proportions and prey volume. However, diets overlaps were not significant, suggesting the absence of negative feeding interactions. Microhabitat use was low overlapped and also not significant, suggesting a differentiation on the use of spatial resource. The absence of negative feeding interactions between Dendrobates auratus and Oophaga pumilio could be due to segregation in microhabitat use and possible by the abundance of trophic resource in the area. The great large volumes of formicids and acarines in the diet of this dendrobatids are in agreement with the hypothesis of these arthropods as a dietary source of alkaloids.

Se estudio la ecología trófica y uso del microhábitat de Dendrobates auratus y Oophaga pumilio en un área de simpatría entre las dos especies ubicada en la Estación Biológica La Selva, Costa Rica. En este sitio ambos dendrobatidos son simpátricos debido a la introducción y naturalización de D. auratus en los últimos 24 años. La dieta de ambas especies se describió a partir del análisis de la técnica del lavado de estómago. Los microhábitas utilizados fueron definidos según el sitio donde cada ejemplar fue capturado. La relación en el uso del microhábitat y la ecología trófica entre ambas especies fue evaluada utilizando el índice de solpamiento de Pianka (Ojk) en el análisis de la dieta (proporción de presas y volumen) y en el uso del microhábitat. La dieta de ambos dendrobátidos estuvo caracterizada principalmente por el consumo de himenópteros (hormigas), ácaros, y colémbolos, resultando consecuentemente en un alto índice de solapamiento en la proporción y volumen de las presas, sin embargo, este alto solapamiento no fue significativo y no implicó la presencia de interacciones negativas entre ambas especies. El uso del microhábitat presentó un solapamiento muy bajo y no significativo, indicando una diferenciación por los microhábitats utilizados por cada especie. La ausencia de interacciones negativas en cuanto al uso de los recursos tróficos entre ambos dendrobátidos podría deberse a la diferenciación en el uso del microhábitat, y posiblemente, a la abundancia de presas en el área. El gran volumen de formícidos y ácaros en la dieta de estas dos especies son consistentes con la hipótesis del consumo de estos artrópodos como una fuente de alcaloides.

448 downloads Cited 1 time in SciELO

15.

Taeniophallus poecilopogon (Cope, 1863) (Serpentes: Dipsadidae): Filling a gap on its known distribution in Argentina
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Falcione, Camila

; Cajade, Rodrigo

; Barrasso, Diego Andrés

; Nenda, Santiago Javier

Cuadernos de herpetología

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dec 2010, Volume 24 N. 2 Pages 137 - 140

Abstract: En | Text: En | PDF: En

243 downloads Cited 1 time in SciELO

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