Uso de habitat e reprodução de Cycloramphus boraceiensis (Anura, Cycloramphidae)
Data
2019
Autores
Gaspari, Gustavo Gabriele de 
Orientadores
Brasileiro, Cinthia Aguirre
Tipo
Dissertação de mestrado
Título da Revista
ISSN da Revista
Título de Volume
Resumo
O período e a duração do ciclo reprodutivo dos anuros estão frequentemente relacionados
a estrutura do habitat e às condições climáticas. Espécies que ocorrem em corpos d'água
permanentes geralmente possuem período reprodutivo mais longo do que as espécies que
reproduzem em ambientes temporários. Cycloramphus boraceiensis é endêmica da Mata
Atlântica e ocorre em riachos encachoeirados. O objetivo deste estudo foi investigar o
uso de habitat e a reprodução de uma população de Cycloramphus boraceiensis no Parque
Estadual da Serra do Mar – Núcleo Caraguatatuba. As coletas e observações em campo
foram realizadas mensalmente entre novembro de 2017 e dezembro de 2018. Todos
indivíduos registrados foram marcados por amputação de artelhos, tiveram o
Comprimento rostro-cloacal (CRC) e a massa corpórea medidos e foram soltos em dois
riachos. Foram capturados 134 adultos, com 21% de recaptura neste período. Os machos
foram encontrados com maior frequência em sítios cobertos por rochas e fêmeas em sítios
expostos. Machos e fêmeas foram frequentemente encontrados em rochas úmidas
próximas ao riacho. Machos e fêmeas recapturados apresentaram aumento do CRC,
porém apresentaram tanto ganho quanto perda de massa corpórea. Temperatura e
precipitação não influenciaram na ocorrência de machos e fêmeas. As fêmeas foram
maiores do que os machos apenas na estação chuvosa. O esforço reprodutivo de machos
e fêmeas foi constante ao longo das estações do ano, porém os machos apresentaram
maior número de espermatozoides na estação chuvosa. Este mostrou uma alta taxa de
recaptura dos indivíduos indicando fidelidade aos sítios de ocorrência, Além disto, C.
boraceiensis apresenta indicativos de reproduzir durante todo o ano, diferindo da grande
maoria das espécies neotropicais de anuros que possuem reprodução sazonal.
The period and duration of the anuran reproductive cycle are often related to habitat structure and climatic conditions. Species that occur in permanent water bodies usually have a longer reproductive period than species that reproduce in temporary environments. Cycloramphus boraceiensis is endemic to the Atlantic Forest and occurs in shrouded streams. The objective of this study was to investigate the habitat use and reproduction of a population of Cycloramphus boraceiensis in Serra do Mar State Park - Caraguatatuba Nucleus. Field surveys and observations were performed monthly between November 2017 and December 2018. All registered individuals were marked by amputation of toes, had rostro-cloacal length (CRC) and body mass measured and were released into two streams. 134 adults were captured, with 21% recapture in this period. Males were found most often at rock-covered sites and females at exposed sites. Males and females were often found in damp rocks near the stream. Recaptured males and females had increased CRC, but had both gain and loss of body mass. Temperature and precipitation did not influence the occurrence of males and females. Females were larger than males only in the rainy season. The reproductive effort of males and females was constant throughout the seasons of the year, but males had higher number of sperm in the rainy season. This showed a high recapture rate of individuals indicating fidelity to the sites of occurrence. In addition, C. boraceiensis shows indications of reproduction throughout the year, differing from the vast majority of neotropical species of anurans that have seasonal reproduction.
The period and duration of the anuran reproductive cycle are often related to habitat structure and climatic conditions. Species that occur in permanent water bodies usually have a longer reproductive period than species that reproduce in temporary environments. Cycloramphus boraceiensis is endemic to the Atlantic Forest and occurs in shrouded streams. The objective of this study was to investigate the habitat use and reproduction of a population of Cycloramphus boraceiensis in Serra do Mar State Park - Caraguatatuba Nucleus. Field surveys and observations were performed monthly between November 2017 and December 2018. All registered individuals were marked by amputation of toes, had rostro-cloacal length (CRC) and body mass measured and were released into two streams. 134 adults were captured, with 21% recapture in this period. Males were found most often at rock-covered sites and females at exposed sites. Males and females were often found in damp rocks near the stream. Recaptured males and females had increased CRC, but had both gain and loss of body mass. Temperature and precipitation did not influence the occurrence of males and females. Females were larger than males only in the rainy season. The reproductive effort of males and females was constant throughout the seasons of the year, but males had higher number of sperm in the rainy season. This showed a high recapture rate of individuals indicating fidelity to the sites of occurrence. In addition, C. boraceiensis shows indications of reproduction throughout the year, differing from the vast majority of neotropical species of anurans that have seasonal reproduction.