The more sheltered, the better – Coastal bays and lagoons are important reproduction habitats for pike in the northern Baltic Sea

Pursiainen, Annie; Veneranta, Lari; Kuningas, Sanna; Saarinen, A.; Kallasvuo, Meri

doi:10.1016/j.ecss.2021.107477

Cited by 14 publications

(8 citation statements)

References 36 publications

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“…The close match of observed and predicted values showed the seasonal amplitude was robust against variations of δ 18 O Water , which agreed with previous work on pike (Gerdeaux & Dufour, 2012). Lower minimum and maximum δ 18 O Otolith than predicted were likely because temperature was measured in pelagic zones of the lagoons, whereas pike in the Baltic often seek warmer, sheltered habitats in shallow areas (Pursiainen et al, 2021). Further, some pike in the Baltic Sea increase their body temperature during winter months by sunbathing (Nordahl et al, 2019), which might offset δ 18 O Otolith to lower values than would be expected from ambient water temperature.…”

Section: Discussionmentioning

confidence: 99%

Corroborating otolith age using oxygen isotopes and comparing outcomes to scale age: Consequences for estimation of growth and reference points in northern pike (Esox lucius)

Rittweg

Trueman

Ehrlich

et al. 2023

Fisheries Management Eco

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Accurate age estimates are crucial for assessing the life‐histories of fish and providing management advice, but validation studies are rare for many species. We corroborated age estimates with annual cycles of oxygen isotopes (δ18O) in otoliths of 86 northern pike (Esox lucius) from the southern Baltic Sea, compared results with visual age estimates from scales and otoliths, and assessed bias introduced by different age‐estimation structures on von Bertalanffy growth models and age‐structured population models. Age estimates from otoliths were accurate, while age estimates from scales significantly underestimated the age of pike older than 6 years compared to the corroborated reference age. Asymptotic length () was larger, and the growth coefficient was lower for scale ages than for corroborated age and otolith age estimates. Consequentially, scale‐informed population models overestimated maximum sustainable yield (), biomass at (), relative frequency of trophy fish (), and optimal minimum length limit but underestimated fishing mortality at (). Using scale‐based ages to inform management regulations for pike may therefore result in conservative management and lost yield. The overestimated asymptotic length may instill unrealistic expectations of trophy potential in recreational anglers targeting large pike, while the overestimation in MSY would cause unrealistic expectations of yield potential in commercial fishers.

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Section: Discussionmentioning

confidence: 99%

Corroborating otolith age using oxygen isotopes and comparing outcomes to scale age: Consequences for estimation of growth and reference points in northern pike (Esox lucius)

Rittweg

Trueman

Ehrlich

et al. 2023

Fisheries Management Eco

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“…Within specific bays, the variability in eDNA concentrations across transects was without typical patterns (Figures S1 and S5). We initially predicted that the central transect (D), which was situated in the deeper part of the bay, would consistently show lower DNA concentrations because it normally would fall outside the preferred vegetated habitat of spawning pike (Frost & Kipling, 1967; Pursiainen et al, 2021). This was however not the case and we found no such discernible patterns.…”

Section: Discussionmentioning

confidence: 99%

Temperature moderates eDNA–biomass relationships in northern pike

et al. 2023

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Support for eDNA as a quantitative monitoring tool is growing worldwide. Despite advances, there are still uncertainties regarding the representability of the eDNA signal over varying spatiotemporal scales, the influence of abiotic forcing, and phenological changes affecting the behavior of the study organism, particularly in open environments. To assess the spatiotemporal variability and predictive power of quantitative eDNA analysis, we applied species-specific real-time quantitative PCR on water filtrates during two visits to 22 coastal bays in the Baltic Sea. Within bays, we collected water along four transects across each bay and compared the pooled eDNA concentration to temporally matched catches from standardized angling targeting the northern pike (Esox lucius), a species for which reliable monitoring data is lacking.We found the variability in eDNA concentrations between transects to be moderate (21%) but still considerably lower than across bays and visits (52%), suggesting small-scale spatial differences are of less importance during spring when pike spawn.Standardized angling catches, bay area, and water temperature together explained 48% of the variance in eDNA concentrations. DNA concentrations decreased with the increasing bay area, likely indicating a dilution effect. Notably, the relationship between eDNA and standardized catches was positive but varied with temperature and the eDNA-abundance relationship was only significant at higher temperatures, which also coincided with a higher proportion of spawning/spent fish. We conclude that temperature is a key moderating factor driving changes in pike behavior and spring DNA-dynamics. We recommend that future surveys focus on larger spatiotemporal scales during times when the influence of changing temperatures is minimized.

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“…Within specific bays, the variability in eDNA concentrations across transects was without typical patterns (Figure S 1, Figure S 5). We initially predicted that the central transect (D), which was situated in the deeper part of the bay, would consistently show lower DNA concentrations because it normally would fall outside the preferred vegetated habitat of spawning pike (Frost and Kipling 1967, Pursiainen et al 2021). This was however not the case and we found no such discernible patterns.…”

Section: Discussionmentioning

confidence: 99%

Temperature moderates eDNA-biomass relationships in northern pike

Ogonowski

Karlsson

Vasemägi

et al. 2022

Preprint

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Support for eDNA as a quantitative monitoring tool is growing worldwide. Despite advances there are still uncertainties regarding the representability of the eDNA signal over varying spatiotemporal scales, influence of abiotic forcing and phenological changes affecting behavior of the study organism, particularly in open environments. To assess the spatiotemporal variability and predictive power of quantitative eDNA analysis, we applied species-specific real-time quantitative PCR on water filtrates during two visits to 22 coastal bays in the Baltic Sea. Within bays, we collected water along four transects across each bay and compared the pooled eDNA concentration to temporally matched catches from standardized angling targeting the northern pike (Esox lucius), a species for which reliable monitoring data is lacking. We found the variability in eDNA concentrations between transects to be moderate (21%) but still considerably lower than across bays and visits (52%), suggesting small scale spatial differences are of less importance during spring when pike spawn. Standardized angling catches, bay area, and water temperature together explained 48% of the variance in eDNA concentrations. DNA concentrations decreased with increasing bay area, likely indicating a dilution effect. Notably, the relationship between eDNA and standardized catches was positive but varied with temperature and the eDNA-abundance relationship was only significant at higher temperatures, which also coincided with a higher proportion of spawning/spent fish. We conclude that temperature is a key moderating factor driving changes in pike behaviour and spring DNA-dynamics. We recommend that future surveys focus on larger spatiotemporal scales during times when the influence of changing temperatures is minimized.

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The more sheltered, the better – Coastal bays and lagoons are important reproduction habitats for pike in the northern Baltic Sea

Cited by 14 publications

References 36 publications

Corroborating otolith age using oxygen isotopes and comparing outcomes to scale age: Consequences for estimation of growth and reference points in northern pike (Esox lucius)

Corroborating otolith age using oxygen isotopes and comparing outcomes to scale age: Consequences for estimation of growth and reference points in northern pike (Esox lucius)

Temperature moderates eDNA–biomass relationships in northern pike

Temperature moderates eDNA-biomass relationships in northern pike

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