Biology and population dynamics of the suspension-feeding wedge clam Donax trunculus (Linnaeus, 1758) were studied for 13 months (November 1994-April 1996) along the Italian Southern Adriatic coast near the Lagoon of Lesina. Specimens were found at depths between 0 and 2 m, mainly in fine grain bottoms. The spatial coastal distribution showed an intraspecific segregation between young and adult wedge clams. A unimodal recruitment (length >4 mm) occurred in winter (December-February). Length frequency distributions were used to determine age and growth rate. Three year classes were regularly observed and their growth pattern defined. The population showed a maximum length of 37 mm and a longevity of 4 years. Analysis of seasonal variations in the reproductive cycle showed that gametogenesis occurred in spring in females. After the spawning season (March-July) females of D. trunculus remained in a resting stage from August to January.
Biology and population dynamics of Donax trunculus L. (Bivalvia : Donacidae) in the South Adriatic Coast (Italy) / M., Manca Zeichen; S., Agnesi; A., Mariani; A., Maccaroni; Ardizzone, Domenico. - In: ESTUARINE, COASTAL AND SHELF SCIENCE. - ISSN 0272-7714. - STAMPA. - 54:6(2002), pp. 971-982. [10.1006/ecss.2001.0868]
Biology and population dynamics of Donax trunculus L. (Bivalvia : Donacidae) in the South Adriatic Coast (Italy)
ARDIZZONE, Domenico
2002
Abstract
Biology and population dynamics of the suspension-feeding wedge clam Donax trunculus (Linnaeus, 1758) were studied for 13 months (November 1994-April 1996) along the Italian Southern Adriatic coast near the Lagoon of Lesina. Specimens were found at depths between 0 and 2 m, mainly in fine grain bottoms. The spatial coastal distribution showed an intraspecific segregation between young and adult wedge clams. A unimodal recruitment (length >4 mm) occurred in winter (December-February). Length frequency distributions were used to determine age and growth rate. Three year classes were regularly observed and their growth pattern defined. The population showed a maximum length of 37 mm and a longevity of 4 years. Analysis of seasonal variations in the reproductive cycle showed that gametogenesis occurred in spring in females. After the spawning season (March-July) females of D. trunculus remained in a resting stage from August to January.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
