ABUNDÂNCIA E REPRODUÇÃO DE OLIGORYZOMYS NIGRIPES (RODENTIA, CRICETIDAE) EM DOIS FRAGMENTOS NO SUL DA MATA ATLÂNTICA, CERRO LARGO, RS
DOI:
https://doi.org/10.4257/oeco.2022.2601.11Keywords:
Bionomy, Litter Size, Population ecology, Small Mammals.Abstract
Oligoryzomys nigripes é uma espécie de roedor generalista com ampla distribuição geográfica na América do Sul. O presente estudo tem por objetivo relatar os padrões de abundância, reprodução e tamanho de ninhada para O. nigripes no sul da Mata Atlântica. O estudo foi realizado em Cerro Largo, RS, em dois fragmentos florestais, entre abril de 2015 e outubro de 2016, com um esforço amostral de 5320 armadilhas-noite. Um número maior de indivíduos foi capturado na primavera e inverno, corroborando prévios estudos que indicam maior abundância dessa espécie nos meses mais frios no limite sul da distribuição dessa espécie. Indivíduos reprodutivos foram encontrados ao longo de todo ano, contudo machos tiveram maior probabilidade de estarem ativos reprodutivamente na primavera. No outono de 2015, durante o procedimento de triagem, uma fêmea pariu três filhotes, sendo esse um raro relato de tamanho de ninhada para roedores neotropicais de vida livre.
ABUNDANCE AND REPRODUCTION OF OLIGORYZOMYS NIGRIPES IN TWO FOREST FRAGMENTS, SOUTHERN OF ATLANTIC FOREST, CERRO LARGO, RS: Oligoryzomys nigripes is a generalist rodent widely distributed in South America. The present study aims to present information on abundance, reproduction, and litter size for O. nigripes in the south of Atlantic Forest biome. This study was conducted at two forest fragments in Cerro Largo, RS, between April 2015 and October 2016, with 5,320 trap-nights. We captured most of the individuals captured during winter and spring, corroborating previous researches that indicated higher abundance during the coldest months on the southern portion of O. nigripes distribution. Reproductive animals were found during all seasons, however, males had greater chances to be reproductive during spring. During autumn of 2015, through handling and identification, one reproductive female had three young; this was a rare record of litter size for a Neotropical rodent.
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