Data/hora: 12/06/2024 07:58:32

Provedor de dados: | Biota Neotropica
País: | Brazil
Título: | Population and reproductive traits of a freshwater amphipod (Crustacea, Peracarida, Hyalellidae) from northwest of the state of Rio Grande do Sul, Brazil
Autores: | Castiglioni,Daniela da Silva; Limberger,Marcio; Castro,Vanessa da Silva; Ubessi,Francieli.
Data: | 2020-01-01
Ano: | 2020
Palavras-chave: | Fecundity; Body size; Hyalella palmeirensis; Sex ratio; Reproduction; Recruitment.
Resumo: | Abstract The study of population and reproductive traits provides information about the ecological structure of natural populations. This study aimed to characterize dynamics and reproductive traits of Hyalella palmeirensis from a natural pond from southern Brazil. The amphipods were sampled monthly (August 2012 to July 2013) by a person with the aid of a hand net for 20 minutes. Ovigerous females and pre-copulatory pairs were individualized in the field. A total of 12,325 individuals were sampled, being 1,421 males, 6,983 females (including 215 ovigerous females) and 3,921 juveniles. Paired and unpaired males were significantly greater in size than females. There was a positive correlation between body size (CL) of paired males and females. Males and females showed bimodal distribution. Total sex ratio favored females, and these were more frequent in almost all months. Ovigerous females and precopulatory pairs were found throughout the year, but with high frequency in winter and autumn, respectively, characterizing a seasonal reproduction. Juveniles were sampled throughout the year, with greater intensity in the spring. The mean fecundity was 19.6 ± 4.34 eggs. No reduction in the number of eggs was observed during embryonic development. The results observed in H. palmeirensis demonstrate that this species has a population and reproductive dynamics very similar to other species of Hyalella already analyzed in southern Brazil. Moreover, it can be seen that although the H. palmeirensis occurs in an environment with anthropic influence (soy cultivation,) the population is managing to remain in the area, with reproduction and recruitment in most months of year.
Tipo: | Info:eu-repo/semantics/article
Idioma: | Inglês
Identificador: | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1676-06032020000200204
Editor: | Instituto Virtual da Biodiversidade | BIOTA - FAPESP
Relação: | 10.1590/1676-0611-bn-2019-0872
Formato: | text/html
Fonte: | Biota Neotropica  v.20 n.2 2020
Fonte: | info:eu-repo/semantics/openAccess