No loss of genetic diversity in the exploited and recently collapsed population of Bay of Biscay anchovy (Engraulis encrasicolus, L.)

作者：Montes Iratxe; Iriondo Mikel; Manzano Carmen; Santos Maria; Conklin Darrell; Carvalho Gary R; Irigoien Xabier; Estonba Andone^*

来源：Marine Biology, 2016, 163(5): 98.

DOI：10.1007/s00227-016-2866-2

The European anchovy, Engraulis encrasicolus, in the Bay of Biscay suffered a collapse in census population size (N-c) starting in 2002, from which it did not recover until 2010. The slow recovery raised concern over sustainability, potential reduction in adaptive potential, and vulnerability to local extirpation. Long- and short-term effective population size (Ne), N-e/N-c ratio, and other genetic parameters were estimated to evaluate demographic signals of population decline. A total of 349 neutral single-nucleotide polymorphisms (SNPs) were screened in 330 anchovy individuals from the Bay of Biscay distributed across a 20-year period. We show that N-c fluctuations have not significantly affected short-term N-e, and therefore, genetic diversity has remained stable throughout the recent collapse. This study illustrates that N-e estimates should be incorporated into management plans. Our results on short-term N-e suggested that the anchovy in the Bay of Biscay has not faced any recent severe threat of losing evolutionary potential due to genetic drift. However, differences between short- and long-term N-e estimates suggested that the Bay of Biscay anchovy population may be currently much smaller than in the historical past.

• 出版日期2016-5