Estrutura populacional, crescimento somático e alométrico, biologia reprodutiva e estimativa do tamanho populacional de Aegla perobae Hebling &Rodrigues, 1977 do município de São Pedro, estado de São Paulo / Population structure, somatic and allometric growth, reproductive biology and population size estimation of Aegla perobae Hebling &Rodrigues, 1977 in São Pedro, São Paulo state

AUTOR(ES)
FONTE

IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia

DATA DE PUBLICAÇÃO

02/09/2011

RESUMO

Aeglids are endemic to the neotropical South America. They are restricted to freshwaters, mainly occurring under rocks and fragmented leaves or buried in the sand (Burns, 1972; Rodrigues &Hebling, 1978; Swiech-Ayoub &Masunari 2001a) in lakes, rivers, streams and even rivers running into caves. The aeglids are important links in the food chain of freshwater environments acting as predators of aquatic larvae (Magni &Py-Daniel, 1989) and as prey by fish, amphibians, reptiles, birds and mammals (Arenas, 1976; Melo, 1990; Pardini, 1998). The aim of this study was to investigate the biology of Aegla perobae with emphasis on structure and population dynamics, allometric growth and reproductive biology to finally classify the risk of extinction this specie based on estimative of population size and your occurrence locations. In chapter 1 we discuss aspects related to population and environmental variables, and it is determined the somatic growth of males and females. In chapter 2 were performed linear regression analysis to determine the state of allometry and morphometric maturity of male and female. We identified four morphotypes after the puberty molt in adults males and it was evident that only two of these morphotypes participate actively of reproduction. In Chapter 3 we evaluated the reproductive traits of A. perobae females based on the reproductive period, fecundity and the relationship of reproductive females abundance with environmental factors. In chapter 4 the population size is estimated and the sites of occurrence of aeglids near the region of São Pedro are examined to determine the degree of risk of extinction of A. perobae. According to evaluation based on IUCN criteria (2001), added to biological data analyzed in this study, we concluded that the population of A. perobae of the county of São Pedro is critically endangered and requires special attention for its preservation.

ASSUNTO(S)

aegla perobae aegla perobae aeglidae aeglidae crescimento relativo estrutura populacional maturidade sexual polimorfismo polymorphism population structure relative growth risco de extinção sex

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