Impact of climate on eel populations of the Northern Hemisphere
Sylvain Bonhommeau,Emmanuel Chassot,Benjamin Planque,Etienne Rivot,Anthony H. Knap,Olivier Le Pape +5 more
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TLDR
Evidence that the survival of eel larvae is strongly correlated to food availability during their early life stages is provided, suggesting that changes in the marine production related to global warming may have led to the decline of European, American and Japanese eel populations.Abstract:
Glass eel abundances are declining worldwide. This has mostly been attributed to direct impacts of human activities such as overfishing or habitat loss and degradation, whilst the potential influence of changes in oceanic conditions has received less attention. Eel are characterized by a complex and still enigmatic life cycle that includes a trans-oceanic spawning and larval migration. The apparent synchrony in the decline of eel populations worldwide suggests that the oceanic mechanisms involved are similar for all populations. We analyse the relationships between oceanic conditions in eel spawning areas and glass eel recruitment success of the 3 most commercially important species of the genus Anguilla: A. anguilla, A. rostrata, and A. japonica. We provide evidence that the survival of eel larvae is strongly correlated to food availability during their early life stages. Over the last 4 decades, changes in the marine production related to global warming may have led to the decline of European, American and Japanese eel populations. In the Pacific and Atlantic Oceans, the shifts in the temperature regime detected in the late 1970s were followed by shifts in the recruitment regime of glass eel for the 3 species. The decrease in primary production through climate-driven processes has therefore affected the recruitment of eel populations.read more
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Ecology of Anguilliform Leptocephali: Remarkable Transparent Fish Larvae of the Ocean Surface Layer
TL;DR: The present state of knowledge about the ecology of anguilliform leptocephali, which are the unique but poorly understood larvae of eels, is examined, which highlights the interesting and unique aspects of leptonocephalus larvae.
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Synergistic patterns of threat and the challenges facing global anguillid eel conservation
David M. P. Jacoby,John M. Casselman,Vicki Crook,Mari-Beth Delucia,Hyojin Ahn,Kenzo Kaifu,Tagried Kurwie,Pierre Sasal,Anders M.C. Silfvergrip,Kevin G. Smith,Kazuo Uchida,Alan Walker,Matthew Gollock +12 more
TL;DR: An overview of the current state of global eel data and conservation is presented, categorising the knowledge gaps and geographic regions where resources are needed and discussing future recommendations to improve the understanding of anguillids.
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Oceanic migration and spawning of anguillid eels.
TL;DR: A greater understanding of the spawning migration and the choice of spawning locations by silver eels is needed to help conserve declining anguillid species.
Journal ArticleDOI
Population genetics of the American eel (Anguilla rostrata): FST = 0 and North Atlantic Oscillation effects on demographic fluctuations of a panmictic species.
Caroline Côté,Pierre-Alexandre Gagnaire,Vincent Bourret,Guy Verreault,Martin Castonguay,Louis Bernatchez +5 more
TL;DR: This study showed that genetically based demographic indices, namely Nb and allelic richness (Ar) can be used as surrogates for the abundance of breeders and recruits, which were both shown to be positively influenced by variation during high NAO phases.
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Where once the eel and the elephant were together: decline of the European eel because of changing hydrology in southwest Europe and northwest Africa?
TL;DR: The European eel (Anguilla anguilla) has been attributed to possible overfishing, poisoning, parasitism, habitat loss and changes in ocean circulation as mentioned in this paper.
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