Local cod (Gadus morhua) revealed by egg surveys and population genetic analysis after longstanding depletion on the Swedish Skagerrak coast

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Local cod (Gadus morhua) revealed by egg surveys and population genetic analysis after longstanding depletion on the Swedish Skagerrak coast

Svedäng, Henrik (författare): Swedish University of Agricultural Sciences,Sveriges lantbruksuniversitet,Stockholms universitet,Stockholms universitets Östersjöcentrum,Swedish Institute for the Marine Environment (SIME), Sweden; Swedish University of Agricultural Sciences (SLU), Sweden,Institutionen för akvatiska resurser,Department of Aquatic Resources,Swedish Institute for the Marine Environment,Stockholm University

Barth, Julia M. I. (författare)

Svenson, Anders (författare): Swedish University of Agricultural Sciences,Sveriges lantbruksuniversitet,Institutionen för akvatiska resurser,Department of Aquatic Resources

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Jonsson, Patrik (författare): Swedish University of Agricultural Sciences,Sveriges lantbruksuniversitet,Institutionen för akvatiska resurser,Department of Aquatic Resources

Jentoft, Sissel (författare)

Knutsen, Halvor (författare)

André, Carl, 1958 (författare): Gothenburg University,Göteborgs universitet,Institutionen för marina vetenskaper,Department of marine sciences

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2018-11-30
2019
Engelska.
Ingår i: ICES Journal of Marine Science. - : Oxford University Press (OUP). - 1054-3139 .- 1095-9289. ; 76:2, s. 418-429

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Tidskriftsartikel (refereegranskat)

Abstract Ämnesord

Stäng

Dramatic and persistent reductions in Atlantic cod (Gadus morhua) are common in many coastal areas. While offshore cod stocks still were abundant and productive, the Swedish west coast showed signs of diminishing adult cod abundance at the beginning of the 1980s, where the local cod component was considered to be extirpated. To survey the present cod spawning activity and stock composition, we initiated egg trawling over two consecutive years (203 hauls in total) in combination with population genetic analyses (425 individually genotyped eggs). Here, we provide evidence of cod spawning at the Swedish Skagerrak coast, suggesting recolonization or that local cod has recovered from a nearly depleted state. Early stage eggs were found inside fjords too far to have been transported by oceanic drift from offshore spawning areas. The cod eggs were genetically similar in early to late life-stages and cluster mainly with the local adult cod, indicating that eggs and adults belong to the same genetic unit. The cod eggs were genetically differentiated from adult North Sea cod, and, to a lesser degree, also from the Kattegat and Öresund cod, i.e. indicating a possible recovery of local coastal stock.The patterns of the genetic structure in the inshore areas are, however, difficult to fully disentangle, as Atlantic cod in the North Sea-Skagerrak area seem to be a mixture of co-existing forms: local cod completing their entire life cycle in fjords and sheltered areas, and oceanic populations showing homing behaviours. The egg abundances are considerably lower compared with what is found in similar studies along the Norwegian Skagerrak coast. Nevertheless, the discovery of locally spawning cod along the Swedish west coast—although at low biomasses—is an encouraging finding that highlights the needs for endurance in protective measures and of detailed surveys to secure intraspecific biodiversity and ecosystem services.

Ämnesord

NATURVETENSKAP -- Biologi (hsv//swe)
NATURAL SCIENCES -- Biological Sciences (hsv//eng)
LANTBRUKSVETENSKAPER -- Lantbruksvetenskap, skogsbruk och fiske -- Fisk- och akvakulturforskning (hsv//swe)
AGRICULTURAL SCIENCES -- Agriculture, Forestry and Fisheries -- Fish and Aquacultural Science (hsv//eng)
NATURVETENSKAP -- Biologi -- Ekologi (hsv//swe)
NATURAL SCIENCES -- Biological Sciences -- Ecology (hsv//eng)

Nyckelord

conservation
egg abundance
fisheries management
genetic population structure
recruitment
spawning
Marine Ecology
marin ekologi
conservation
egg abundance
fisheries management
genetic population structure
recruitment
spawning

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Av författaren/redakt...: Svedäng, Henrik; Barth, Julia M. ...; Svenson, Anders; Jonsson, Patrik; Jentoft, Sissel; Knutsen, Halvor; visa fler...; André, Carl, 195 ...; visa färre...

Om ämnet

NATURVETENSKAP: NATURVETENSKAP; och Biologi

LANTBRUKSVETENSKAPER: LANTBRUKSVETENSK ...; och Lantbruksvetensk ...; och Fisk och akvakul ...

NATURVETENSKAP: NATURVETENSKAP; och Biologi; och Ekologi

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