Ciclo reproductor de Helobdella triserialis (Hirudinea, Glossiphoniidae), Provincia de Buenos Aires, Argentina
2003; Volume: 15; Issue: 167 Linguagem: Inglês
ISSN
0325-2264
Autores Tópico(s)Leech Biology and Applications
ResumoThis study describes the reproductive cycle of Helobdella triserialis in terms of its four succesive sexual maturity stages scale for female and male gonads, frequency distribution of maturity stages, seasonal variation of the population mean gonadal state, relative fecundity and reproductive potential. These parameters were estimated from monthly samples obtained in an irrigation canal in Los Talas, Province of Buenos Aires, Argentina (34o 53’S - 57o 50’W). Helobdella triserialis has a semelparous life cycle and the reproductive season extending from August/September to April/May, with a reproductive peak in August and another in February. Testisacs and ovisacs maturity reaches the maximum in August. The spring reproductive potential value is 4218 eggs / 100 individuals and the summer potential value is 2050 eggs / 100 individuals
Referência(s)