Recent changes in ichthyoplanktonic assemblages of the eastern English Channel

Type Article
Date 2020-02
Language English
Author(s) Di Pane Julien1, 2, Koubbi Philippe1, 3, Giraldo CarolinaORCID1, Lefebvre Valerie1, Caboche Josselin1, Marchal PaulORCID1, Loots Christophe1
Affiliation(s) 1 : IFREMER, Channel and North Sea Fisheries Research Unit, 150 quai Gambetta, F-62321 Boulogne-sur-Mer, France
2 : BOREA, Museum national d'histoire naturelle, Sorbonne Université, Université de Caen Normandie, Université des Antilles, CNRS, IRD, 43 rue Cuvier, 75005 Paris, France
3 : UFR 918 Terre Environnement et Biodiversité, Sorbonne Université, 4, place Jussieu, F-75252 Paris Cedex 05, France
Source Journal Of Sea Research (1385-1101) (Elsevier BV), 2020-02 , Vol. 157 , P. 101848 (9p.)
DOI 10.1016/j.seares.2020.101848
WOS© Times Cited 3
Keyword(s) Fish larvae, Temporal variations, Atlantic Multidecadal Oscillation, Outlying Mean Index, Variance partitioning, English Channel

ish assemblages vary through time in both abundance and diversity, often due to changes in climate. The potential consequences of these changes on the larval phase need to be considered. In the Eastern English Channel, fish larvae of 30 taxa, from surveys conducted during spring in the nineties and in 2017 with bongo nets, were used to investigate seasonal and interannual changes in larval assemblages with different statistical tests and multivariate analyses (Outlying Mean Index, Principal Coordinate Analysis and variance partitioning). The major change observed was significant lower abundances in 2017 (in April and May) compared to the nineties. Most of the dominant taxa were two to three-fold less abundant in 2017 than the 1990s. We suggest that the reduced larval abundances in 2017 could be a consequence of lower adult abundances in the area from a switch from a colder to a warmer phase of the Atlantic Multidecadal Oscillation.

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