Abstract This study aimed to determine the tree structure, floristic composition and species diversity in the Araucaria State Park, southern Brazil. We allocated 100 plots of 100 m2 (1 ha) each one, and we recorded all trees with diameters at breast height ≥ 5 cm. We sampled 1368 individuals of 106 species, 75 genera and 44 families. Fabaceae, Lauraceae and Myrtaceae showed the greatest richness of species. The diversity of tree species was high (H ‘= 3.96), although the observed richness was less than the estimated one. The basal area was 46.88 m2 ha-1. We observed an intrinsic association between Araucaria angustifolia and Nectandra megapotamica, and a predominance of secondary and zoochorous (> 70%) species. Endangered and vulnerable species in the Santa Catarina state, such as Araucaria angustifolia, Cedrela fissilis, Dicksonia sellowiana and Ocotea porosa were sampled in the Park, highlighting its importance for the conservation of the Mixed Ombrophylous Forest.

ABSTRACT The Atlantic Forest of southeastern Brazil has been considered to have the highest number of tree species per hectare in the world. Assessing the influence of climate on tropical tree species is a priority in the face of ongoing climate change, and for which dendrochronological studies have been important. We address the dendrochronological potential of Licaria bahiana Kurz (Lauraceae), an endemic species of the Atlantic forests. We studied growth ring anatomy of L. bahiana and applied dendrochronological methods to investigate how short-term variation in climate affect its radial growth. Distinct growth rings were observed in all individuals and demarcated by darker tangential fiber zones in latewood. Trees showed high climatic sensitivity (0.48) and growth synchrony (intercorrelation r = 0.69; rbar = 0.38). Radial growth was negatively influenced by high temperatures at the beginning of the current growing season (r = -0.46) and by excessive rainfall at the end of the current growing season (r = -0.29), which are periods that correspond to the phenological reproductive phases of the species. Climate anomalies during this period may alter the tradeoff between growth and reproduction, in favor of the latter.

RESUMO As espécies raras são particularmente importantes do ponto de vista da conservação, ecologia e biologia evolutiva, além de ser frequentemente o foco para decisões políticas. O objetivo do trabalho foi avaliar a raridade de Lauraceae amostradas pelo Inventário Florístico Florestal de Santa Catarina na Floresta Estacional Decidual e na Floresta Ombrófila Mista. Coletaram-se dados em 234 unidades amostrais com 0,40 ha cada, registrando-se árvores com diâmetro na altura de 1,30m ≥ 10 cm. Foi utilizada a metodologia Rabinowitz para segregar as espécies em raras ou comuns, considerando três variáveis: distribuição geográfica, especificidade por habitat e tamanho populacional. Das 37 espécies, 59,46% apresentaram raridade e 40,54% foram comuns. Classificou-se 56,76% das espécies como euritópica e 59,46% eurioica. Das espécies, 2,70% foram exclusivas da Floresta Estacional Decidual, 67,57% exclusivas da Floresta Ombrófila Mista e 29,73% ocorreram em ambas. Esta análise colaborou para a compreensão da raridade das espécies da região estudada e pode contribuir para ações de conservação dessa família no planalto catarinense, uma vez que a maior parte das espécies é de alguma forma rara e o cenário atual é de intenso processo de fragmentação florestal.

ABSTRACT The rare species are particularly important from the point of view of conservation ecology and evolutionary biology, and often become the focus for policy decisions. The objective was to evaluate the Lauraceae rarity sampled by the Floristic Forest Inventory of Santa Catarina in Deciduous Forest (DF) and Araucaria Forest (AF). Data were collected in 234 sampling units of 0.40 ha each, recording trees with diameter at breast height ≥ 10 cm. We used Rabinowitzʼs methodology to segregate rare and common species, considering three variables: geographic distribution, habitat specificity, and population size. Of the 37 species, 59.46% were rare and 40.54% were common. 56.76% of the species were eurytopic and 59.46% euryecious. 2.70% of the species were exclusive of DF, 67.57% exclusive of AF, and 29.73% occurred in both. This analysis contributed to the understanding of the rarity of the species in the studied region and it can also contribute to conservation actions for this family on Santa Catarina plateau, since most species are somewhat rare and intense forest fragmentation is the current scenario.

Objetivou-se avaliar as espécies arbóreas raras e comuns da família Myrtaceae amostradas pelo Inventário Florístico Florestal de Santa Catarina na Floresta Estacional Decidual. Esta floresta ocorre ao longo do rio Uruguai e afluentes, sob baixas temperaturas no inverno e chuvas bem distribuídas ao longo do ano, com árvores do dossel e emergentes predominantemente caducifólias. Coletaram-se dados em 78 unidades amostrais com 0,40 ha cada, registrando-se árvores com diâmetro na altura do peito ≥ 10 cm. Utilizou-se a metodologia Rabinowitz para segregar as espécies em raras ou comuns, considerando três variáveis: distribuição geográfica, especificidade por habitat e tamanho populacional. Das 28 espécies amostradas, 78,57% (22 spp.) apresentaram alguma forma de raridade e 21,43% (6 spp.) foram comuns. As espécies de Myrtaceae na Floresta Estacional Decidual são, em geral, amplamente distribuídas, mas seletivas quanto ao habitat e possuem poucos indivíduos. Destacam-se três espécies consideradas raras na floresta avaliada: Eugenia subterminalis, Myrcianthes gigantea e Siphoneugena reitzii com um indivíduo cada. Campomanesia xanthocarpa foi a espécie mais comum. Todas as espécies avaliadas são zoocóricas e podem ser utilizadas em restauração ambiental.

We surveyed the common and rare species of Myrtaceae that were sampled in the Santa Catarina Forest Floristic Inventory of the Seasonal Deciduous Forest. This forest runs along the Uruguay River and its tributaries, with cold winters and rainfall distributed throughout the year, and a mostly deciduous and emergent canopy. We collected data in 78 sample units, each with an area of 0.40 ha, and recorded trees ≥ 10 cm diameter at breast height. We used Rabinowitz methodology to separate common and rare species, based on three variables: geographic distribution, habitat and population size. Of the 28 species sampled, 78.57% (22 spp.) were rare and 21.43% (6 spp.) were common. Myrtaceae species in the Seasonal Deciduous Forest are generally widely distributed, but are selective in relation to habitat and low in abundance. It is important to note that three species were considered rare in this forest: Eugenia subterminalis DC., Myrcianthes gigantea (D.Legrand) D.Legrand and Siphoneugena reitzii D.Legrand with one individual each. Campomanesia xanthocarpa (Mart.) O.Berg was the most common species. All species are dispersed by animals and can be used in habitat restoration.

No presente trabalho, são apresentados dados sobre a condição corporal (CC) e a idade das ovelhas de um rebanho ovino do Rio Grande do Sul, no início do encarneiramento e sua relação com a percentagem de prenhez (PP). As PP e a CC média observadas foram 90,4% e 2,84 (±0,57) respectivamente. A CC média das ovelhas prenhes (P) e vazias (V) foram: P 2,86 (±0,56) e V 2,64(±0,59), tendo sido observada diferença significativa (p< 0,001). A PP por categoria de CC das ovelhas, no início do encarneiramento, mostrou que, conforme aumenta a CC, aumenta a PP, chegando aos valores de 92% e 98% no grupo de ovelhas com CC 3,0 e 4,0 respectivamente. Finalmente, a análise de regressão logística realizada mostrou não haver relação da idade da ovelha na taxa de prenhez, confirmando, entretanto, associação positiva entre prenhez e CC (p = 0,002).

In this study, the relationship between score of body condition (BC) at the beginning of mating and ewes age with the pregnancy rate (PR) of a Corriedale sheep flock, grazed in the State of Rio Grande do Sul- Brazil are presented and discussed. The BC and PR observed on the flock were 90.4% and 2.84(±0.57) respectively. The mean of BC of the pregnant (P) and non-pregnant (NP) ewes was P 2.86 (±0.56) and NP 2.64(±0.59). The values of P and NP have shown statistic significance (P< 0.001). The results showed, also, that the PR increase as the BC increases, reaching 92 and 98% on the group of ewes with BC 3.0 and 4.0 respectively. Finally, the regression logistic analysis from the data showed that the age of the ewes have no relation with the PR and a positive relationship between pregnancy and body score condition ( p=0.002).