Causes of different impact of Major Baltic Inflows on cod reproduction in the Gotland Basin of the Baltic Sea

Karaseva, E. M.; Zezera, A. S.

doi:10.1134/s0001437016040068

Cited by 3 publications

(6 citation statements)

References 10 publications

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“…A similar pattern was also seen in the GoF cod (e.g., Aro, ). Cod eggs require higher salinity than P. flesus’ eggs (>13 vs. >10 psu), yet both cod's and P. flesus’ RV in the EGB greatly increased following the multiple inflows of high salinity, oxygen saturated waters (MBI, Major Baltic Inflow) from the North Sea into the deep Baltic Sea basins in the 1970s (Karaseva & Zezera, ; Nissling et al, ). Hinrichsen et al (; ) used a hydrodynamic model coupled with Lagrangian simulations to estimate the effect of fluctuating [O 2 ] and salinity on flounder reproductive success and egg and larval survival in the central Baltic.…”

Section: Discussionmentioning

confidence: 99%

“…A similar pattern was also seen in the GoF cod (e.g., Aro, 1989). Cod eggs require higher salinity than P. flesus' eggs (>13 vs. >10 psu), yet both cod's and P. flesus' RV in the EGB greatly increased following the multiple inflows of high salinity, oxygen saturated waters (MBI, Major Baltic Inflow) from the North Sea into the deep Baltic Sea basins in the 1970s (Karaseva & Zezera, 2016;Nissling et al, 2002). Hinrichsen et al (2017; This scenario bears resemblance to cases of fishery collapse caused by the successive disappearance of previously unobserved, demographically independent stock components, such as the collapse of the West Greenland cod fishery (Bonanomi et al, 2015).…”

Section: Re Sultsmentioning

confidence: 99%

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Cryptic temporal changes in stock composition explain the decline of a flounder (Platichthys spp.) assemblage

Momigliano

Jokinen

Calboli

et al. 2019

Evolutionary Applications

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Unobserved diversity, such as undetected genetic structure or the presence of cryptic species, is of concern for the conservation and management of global biodiversity in the face of threatening anthropogenic processes. For instance, unobserved diversity can lead to overestimation of maximum sustainable yields and therefore to overharvesting of the more vulnerable stock components within unrecognized mixed‐stock fisheries. We used DNA from archival (otolith) samples to reconstruct the temporal (1976–2011) genetic makeup of two mixed‐stock flounder fisheries in the Åland Sea (AS) and the Gulf of Finland (GoF). Both fisheries have hitherto been managed as a single stock of European flounders ( Platichthys flesus ), but were recently revealed to target two closely related species: the pelagic‐spawning P. flesus and the newly described, demersal‐spawning P. solemdali . While the AS and GoF fisheries were assumed to consist exclusively of P. solemdali , P. flesus dominated the GoF flounder assemblage (87% of total) in 1983, had disappeared (0%) by 1993, and remained in low proportions (10%–11%) thereafter. In the AS, P. solemdali dominated throughout the sampling period (>70%), and P. flesus remained in very low proportions after 1983. The disappearance of P. flesus from the GoF coincides in time with a dramatic (~60%) decline in commercial landings and worsening environmental conditions in P. flesus’ northernmost spawning ground, the Eastern Gotland Basin, in the preceding 4–6 years. These results are compatible with the hypothesis that P. flesus in the GoF is a sink population relying on larval subsidies from southern spawning grounds and the cause of their disappearance is a cessation of larval supply. Our results highlight the importance of uncovering unobserved genetic diversity and studying spatiotemporal changes in the relative contribution of different stock components, as well as the underlying environmental causes, to manage marine resources in the age of rapid anthropogenic change.

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Section: Discussionmentioning

confidence: 99%

Section: Re Sultsmentioning

confidence: 99%

Cryptic temporal changes in stock composition explain the decline of a flounder (Platichthys spp.) assemblage

Momigliano

Jokinen

Calboli

et al. 2019

Evolutionary Applications

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“…The positive influence of intense water inflows on cod reproduction in the Gotland area is most clearly observed in the case of the penetration of two successive inflows (a water inflow cluster according to Matthäus terminology) (Matthäus, 2006). In these cases, a continuous spawning cod biotope is formed in the vast water area; in the Gotland Basin, this biotope covers the layer at depths from 80 to 120-130 m (Karaseva and Zezera, 2016). This leads to the emergence of a migration pathway that allows cod to migrate from southwestern to northeastern areas.…”

Section: Discussionmentioning

confidence: 99%

“…The second cause might be related to mass skipped spawning. In 1979In -1985 phenomenon was recorded for cod in the Gotland area (Uzars et al, 1989;Karaseva, 2016). The skipped spawning caused by oocyte resorption is an adaptive response of the reproductive capacity of the population to changes in the environmental conditions (Shatunovskii and Ruban, 2010).…”

Section: Discussionmentioning

confidence: 99%

The Egg Abundance of Eastern Baltic Cod Gadus morhua callarias (Gadidae) in the 20th Century as a Population Status Indicator

Karaseva

2018

J. Ichthyol.

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Data on the egg abundance of cod Gadus morhua callarias in the ichthyoplankton of deepwater basins of the Baltic Sea in 1903-2000 are presented. The maxima of the total cod egg abundance that were observed in 1947-1956 and 1976-1981 are associated with the activation of cod reproduction in the northeastern areas of the sea and coincide with the period of growth in the salinity of the near-bottom water layer. The cod reproduction is characterized by alternating periods of expansion of spawning ground area (owing to the Gotland Basin in the northeast) and its decrease, with the maintenance of the annual reproduction only in the Bornholm Basin (the southwest of the sea). It is assumed that the dynamics of the egg abundance in the periods of mass cod spawning in northeastern areas was opposite in the Gotland and Bornholm basins.

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“…The effect of the Major Baltic Inflows on cod reproduction has been studied earlier and results indicate that the effect can be small to important based on the pre-existing hydrological conditions, which determine how big the potential spawning area will be. The inflow of 1993-1995 had a small effect because the conditions before did not predispose the formation of large spawning areas, while the effect of the Major Baltic Inflow in 2003 was bigger (Karaseva and Zezera 2016). We used data from ICES to compare our values with the stock size indicator.…”

Section: Phytoplankton Blooms In the Baltic Seamentioning

confidence: 99%

Copernicus Marine Service Ocean State Report, Issue 3

Schuckmann¹,

Traon²,

Smith³

et al. 2019

Journal of Operational Oceanography

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Causes of different impact of Major Baltic Inflows on cod reproduction in the Gotland Basin of the Baltic Sea

Cited by 3 publications

References 10 publications

Cryptic temporal changes in stock composition explain the decline of a flounder (Platichthys spp.) assemblage

Cryptic temporal changes in stock composition explain the decline of a flounder (Platichthys spp.) assemblage

The Egg Abundance of Eastern Baltic Cod Gadus morhua callarias (Gadidae) in the 20th Century as a Population Status Indicator

Copernicus Marine Service Ocean State Report, Issue 3

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