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Nutrient-driven poleward expansion of the Northeast Atlantic mackerel (Scomber scombrus) stock: A new hypothesisNutrient-driven expansion of the mackerel stock

Nutrient-driven expansion of the mackerel stock

Författare och institution:
Selma Pacariz (Institutionen för marina vetenskaper); Hjálmar Hátún (-); Jan Arge Jacobsen (-); Clare Johnson (-); Sólva Eliasen (-); Francisco Rey (-)
Publicerad i:
Elementa: Science of Anthropocene, 4 s. 000105
E-ISSN:
2325-1026
Publikationstyp:
Artikel, refereegranskad vetenskaplig
Publiceringsår:
2016
Språk:
engelska
Fulltextlänk:
Sammanfattning (abstract):
The Northeast Atlantic mackerel (Scomber scombrus) stock has increased and expanded its summer feeding migration west- and northwards since 2006, entailing large geopolitical challenges for the countries harvesting this species. A common perspective is that climatic warming opens up new regions for biota in the north. It has also been suggested that the presently large pelagic fish stocks deplete prey resources in the eastern North Atlantic during their summer feeding phase, forcing the stocks west towards the Irminger Sea in their search for food. Here, we suggest that the declining nutrient (silicate) concentrations observed along the northern European continental slope reduce primary and thus secondary production, exacerbating food scarceness in the east and adding to the incentive to migrate westward. The new westward feeding route requires that the fish cross the Iceland Basin, which during the summer season quickly becomes nutrient-depleted and thus might act as a barrier to migration after the spring bloom. Using mackerel and zooplankton abundance data from the International Ecosystem Summer Surveys in the Nordic Seas, we suggest that the oligotrophic waters in the central Iceland Basin force the fish to migrate through a narrow ‘corridor’ along the south Iceland shelf, where nutrients are replenished and both primary and secondary production are higher.
Ämne (baseras på Högskoleverkets indelning av forskningsämnen):
NATURVETENSKAP ->
Geovetenskap och miljövetenskap ->
Oceanografi, hydrologi, vattenresurser ->
Oceanografi
Nyckelord:
silicate decline, nutrient decline, mackerel migration
Postens nummer:
237185
Posten skapad:
2016-06-01 14:51
Posten ändrad:
2016-07-05 15:55

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