Linking scales of life-history variation with population structure in Atlantic cod

Wright, Peter J.; Doyle, Alice; Taggart, John B.; Stirling, Andrew

doi:10.1101/2020.07.17.208660

Cited by 2 publications

(2 citation statements)

References 63 publications

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“…This section firstly considered the whole North Sea and thereafter focused on southern, northwestern and northeastern subareas (further specified below) to acknowledge the likely existence of subpopulations of North Sea cod (Holmes et al, 2014; Wright et al, 2018, 2021) to investigate links between copepod (cod larval prey) biography and cod recruitment dynamics at varying spatial (and temporal) scales (Table 1).…”

Section: Methodsmentioning

confidence: 99%

Latitudinally distinct stocks of Atlantic cod face fundamentally different biophysical challenges under on‐going climate change

et al. 2023

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The reproductive success of marine ectotherms is especially vulnerable in warming oceans due to alterations in adult physiology, as well as embryonic and larval survival prospects. These vital responses may, however, differ considerably across the species' geographical distribution. Here we investigated the life history, focusing on reproductive ecology, of three spatially distant populations (stocks) of Atlantic cod (Gadus morhua, Gadidae) (50-80° N), in the Irish/Celtic Seas-English Channel Complex, North and Barents Seas, under past and projected climate. First, experimental tracking of spawning behaviour evidenced that the ovulation cycle is highly distressed at ≥9.6 (±0.25)°C (T up ). This knife-edge threshold resulted in erratic spawning frequencies, whereas vitellogenin sequestration remained unaffected, indicating endocrine rather than aerobic scope constraints. Cod in the Celtic Sea-English Channel are, therefore, expected to show critical stock depensation over the next decades as spawning grounds warm above T up , with Irish Sea cod subsequently at risk. Second, in the relatively cooler North Sea, the northward retraction of Calanus finmarchicus (Calanidae)and Para-Pseudocalanus spp. (Clausocalanidae) (1958-2017) limit cod larvae feeding opportunities, particularly in the southernmost subarea. However, the contrasting increase in Calanus helgolandicus (Calanidae) does not counteract this negative effect, likely because cod larvae hatch ahead of its abundance peaks. Overfishing again comes as a twin effect. Third, in the still relatively cold Barents Sea, the sustainably harvested cod benefit from improved food conditions in the recent ice-free polar region but at the energetic cost of lengthier and faster spawning migrations. Consequently, under climate change local stocks are stressed by different mechanistic factors of varying management severity.

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Section: Methodsmentioning

confidence: 99%

Latitudinally distinct stocks of Atlantic cod face fundamentally different biophysical challenges under on‐going climate change

et al. 2023

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“…water temperature, and anthropogenic stressors e.g. fishing pressure or coastal land-use practices, are thought to highly influence juvenile bass populations (Laffaille et al, 2000;Green et al, 2012), causing variability in growth rates (Ying et al, 2011;Wright et al, 2019), and abundance (Wright et al, 2019(Wright et al, , 2020. There however remains a lack of understanding on how juvenile bass populations exploit inshore areas, or their associated spatial ecology.…”

Section: Introductionmentioning

confidence: 99%

Identifying juvenile and sub-adult movements to inform recovery strategies for a high value fishery—European bass (Dicentrarchus labrax)

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Clarke

Plenty

et al. 2021

ICES Journal of Marine Science

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The European bass (Dicentrarchus labrax) support high value commercial and recreational fisheries, however the Spawning Stock Biomass (SSB) of the northern Atlantic stock (ICES divisions 4.b–c, 7.a, and 7.d–h) has rapidly declined to an unsustainable level. The decline in SSB has been attributed to high fishing pressure combined with poor recruitment. By tracking juvenile fish their spatial ecology can be identified, and appropriate fisheries management policies designed to boost recruitment can be implemented. Using acoustic telemetry 146 sub-adult European bass (25.2–60 cm fork length) were tracked for up to 370 d across three sites in the southwest of the UK. Tagged fish were detected 2 724 548 times (Range: 166–106 393 detections per fish). Linear modelling estimated tagged fish were resident within 2.4–20.1 km of the site where they were first caught for 42.9–75.5% of the year. Some fish were however resident throughout summer and winter. Individual fish were also tracked moving up to 317 km to other coastal sites, 81% of which returned to their original capture site. Fisheries management should account for the high site fidelity displayed by juveniles and sub-adults of this species and coastal nursery sites should be considered essential habitat.

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Linking scales of life-history variation with population structure in Atlantic cod

Cited by 2 publications

References 63 publications

Latitudinally distinct stocks of Atlantic cod face fundamentally different biophysical challenges under on‐going climate change

Latitudinally distinct stocks of Atlantic cod face fundamentally different biophysical challenges under on‐going climate change

Identifying juvenile and sub-adult movements to inform recovery strategies for a high value fishery—European bass (Dicentrarchus labrax)

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