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|Title:||Population Dynamics Of Parhyale Hawaiensis(dana,1853) (amphipoda: Hyalidae) Associated With An Intertidal Algal Belt In Southeastern Brazil|
Gisela de A.; Flynn
|Abstract:||Static life tables were used to establish demographic parameters such as size-class structure, abundance trends, sex ratio, net reproductive rate, generation time, and per capita rate of population growth for a population of the amphipod Parahyale hawaiensis (Dana, 1853) (Hyalidae) from the intertidal belt of a red alga Bryocladia trysigera (J. Agardh) F. Schmitz in southeastern Brazil. Collections were taken monthly from December 2012 to November 2013. There were two reproductive peaks, a higher one, May to July, and a second throughout the warmer months, October to January. The continuous reproduction results in the overlapping of generations. A sex ratio biased in favor of females was recorded in all sampling dates, a common pattern in epifaunal species. The estimated net reproductive rate was 1.45 +/- 1.01 young per female, the generation time 3.51 +/- 1.31 months, and the population growth rate 0.06 +/- 0.17 per capita per month. The logistic growth model indicates that an initial population of 10 individuals would reach the carrying capacity for the species in a natural environment in 35 to 40 generations time, a period equivalent to 130 to 150 months. As a result of extinction model application, no possibility of extinction was predicted for the local population. The estimated parameters can be used as endpoints in ecotoxicological tests.|
|Appears in Collections:||Unicamp - Artigos e Outros Documentos|
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