Age and growth in three populations of Dosinia exoleta (Bivalvia: Veneridae) from the Portuguese coast

作者：Moura Paula; Vasconcelos Paulo; Gaspar Miguel B^*

来源：Helgoland Marine Research, 2013, 67(4): 639-652.

DOI：10.1007/s10152-013-0350-7

• Dosinia exoleta
• Age
• Growth
• Latitudinal variation
• Fishing effects
• Portugal

The present study aimed at estimating the age and growth in three populations of Dosinia exoleta from the Portuguese coast (Aveiro in the north, SetA(0)bal in the southwest and Faro in the south). Two techniques were compared to ascertain the most suitable method for ageing D. exoleta. Growth marks on the shell surface and acetate peel replicas of sectioned shells were the techniques applied. Two hypotheses were tested: growth parameters present latitudinal variation along the Portuguese coast; growth parameters are influenced by the fishing exploitation. Shell surface rings proved inappropriate for ageing this species, whereas acetate peels provided realistic estimates of the von Bertalanffy growth parameters (K, L (a) and t (0)). A latitudinal gradient in growth rate was detected, with a clear southward increase in the growth coefficient (K) of D. exoleta (Faro %26gt; SetA(0)bal and Aveiro) indicating that warmer waters in southern Portugal provide optimal conditions for the growth of this species. Fishing exploitation in northern Portugal targets larger individuals and leaves behind a younger population of smaller individuals, decreasing the asymptotic shell length (L (a) ) of D. exoleta from Aveiro. The overall growth performance was compared among populations of D. exoleta and with other venerid species worldwide.

• 出版日期2013-12