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Species’ life histories include your survival, growth, energy storage and reproduction. The balance of time and resource allocation among these processes is strongly modulated by environmental factors. The toxic contaminants, such as heavy metals, can negatively affect the physiology of organisms, as well as their life histories. The marine macroalgae are known for their high heavy metals accumulation capacity and via additional contamination for the diverse fauna associated to home. Among the associated fauna, the Amphipoda are one the most abundant and diverse groups, with several species used as bioindicators of environmental quality due to its high sensitivity to a variety of pollutants. Reproduction and growth of these organisms are the main affected life history traits. Thus, the aim of this work was to study the life history traits and population dynamics of the amphipod Hyale niger associated to Sargassum sp. beds from different locations in an area with contamination history. The Saco da Ribeira is a bay located within the Flamengo Inlet (Ubatuba, Sao Paulo), the region identified as contaminated by hydrocarbons and heavy metals for quality reports of water conducted by CETESB. In this place, fronds of Sargassum sp. were collected monthly from March 2014 to February 2015 in four points: Lamberto and Ribeira beaches, located closer to Saco da Ribeira; and Santa Rita and Flamengo beaches, located outside the Saco da Ribeira. The H. niger specimens collected were measured for the construction of age-specific life tables and for growth analysis. The concentrations of heavy metals in the tissues of the algae were measured, finding higher values in the samples collected closer to Saco da Ribeira. The density of H. niger showed between local and temporal variation, but was not related to biomass Sargassum sp. and epibionts, discarding the possibility of food availability and shelter influence the variation found. The populations of H. niger also showed variation in their life history elements between sites: in Lamberto, females have greater length and lower reproductive rate, which indicates the largest investment in its growth; in Santa Rita, females had lower length, the greater volume of eggs and more cohorts, indicating that females invest in reproduction and the highest number of reproductive events; already in the Ribeira, females showed shorter body length, lower volume of eggs and higher reproductive index, are females invest more in reproductive chances throughout life than the size of their eggs. Thus, the Hyale niger species can be considered an efficient model organism in the study of life history as it showed flexibility in its parameters of reproduction, growth and maintenance in different environmental conditions, including the possible influences of concentrations of heavy metals as important modulating factors.

livro de resumos do x congresso brasileiro sobre crustáceos

HISTÓRIA DE VIDA E DINÂMICA POPULACIONAL DE HYALE NIGER (HASWELL, 1879) (AMPHIPODA, HYALIDAE) ASSOCIADA A SARGASSUM SP. (PHAEOPHYTA, FUCALES) EM UMA ÁREA COM HISTÓRICO DE CONTAMINAÇÃO