Spawning time of Atlantic herring ( Clupea harengus ) populations within a restricted area reflects their otolith growth at the larval stage

Berg, Florian; Husebø, Åse; Godiksen, Jane Aanestad; Slotte, Aril; Folkvord, Arild

doi:10.1016/j.fishres.2017.05.009

Cited by 13 publications

(8 citation statements)

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“…Further, the measured increment widths of spring type otoliths are in accordance with other studies that analysed daily growth pattern of spring spawners along the Norwegian coast, but the growth is slower compared to herring spawned later in spring (Clausen et al, 2007;Berg et al, 2017;Slotte et al, 2019). On the other hand, autumn type otoliths had a larger growth compared to North Sea autumn spawners (Moksness and Fossum, 1991), but similar growth compared to Norwegian summer/autumn spawners (Husebø et al, 2005).…”

Section: Discussionsupporting

confidence: 89%

A combination of genetic and phenotypic characterization of spring- and autumn-spawning herring suggests gene flow between populations

Berg

Østgaard

Slotte

et al. 2020

ICES Journal of Marine Science

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Atlantic herring (Clupea harengus) has complex population structure and dynamics including diverse life histories and spawning times with spring and autumn spawning as the most common modes. Originally, spawning herring were phenotypically identified based on their maturity development or otolith microstructure by determining seasonal specific larval growth patterns. Recently, genetic markers have revealed clear genetic differentiation between spring- and autumn-spawning populations. All three methods were applied to herring caught at the same locations during spring and autumn to determine the coherence of methods. In a selected subset, most herring (∼77%) had an otolith microstructure and genetic assignment coinciding with the phenotypically assigned spawning season. Non-spawning herring (<5%) that were classified as belonging to the current spawning season using genotyping and otolith-typing were assigned as skipped spawners. For ∼8% of spawning herring, the genetic and otolith assignment contradicted the phenotypically assigned spawning season, characteristic of straying individuals. Otolith-typing contradicted the genetic and phenotypical assignment in ∼7% of the cases, potentially representing individuals reuniting back to the spawning season favoured by their genotype. Although the viability of offspring from these individuals remains undocumented, it is suggested that the observed switching of spawning season may contribute to gene flow between herring populations.

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Section: Discussionsupporting

confidence: 89%

A combination of genetic and phenotypic characterization of spring- and autumn-spawning herring suggests gene flow between populations

Berg

Østgaard

Slotte

et al. 2020

ICES Journal of Marine Science

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“…Environmental factors have a strong influence on many phenotypic traits in herring. For example, temperature affects growth [ 20 ] and otolith microstructure [ 21 , 22 ], as well as the number of vertebrae and can act in combination with salinity [ 23 , 24 ]. While growth and otolith microstructure can vary over time with temperature, the number of vertebrae will be determined once during metamorphosis based on the experienced environmental conditions [ 25 ].…”

Section: Introductionmentioning

confidence: 99%

Genetic factors have a major effect on growth, number of vertebrae and otolith shape in Atlantic herring (Clupea harengus)

et al. 2018

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Atlantic herring, Clupea harengus, have complex population structures. Mixing of populations is known, but the extent of connectivity is still unclear. Phenotypic plasticity results in divergent phenotypes in response to environmental factors. A marked salinity gradient occurs from Atlantic Ocean (salinity 35) into the Baltic Sea (salinity range 2–12). Herring from both habitats display phenotypic and genetic variability. To explore how genetic factors and salinity influence phenotypic traits like growth, number of vertebrae and otolith shape an experimental population consisting of Atlantic purebreds and Atlantic/Baltic F1 hybrids were incubated and co-reared at two different salinities, 16 and 35, for three years. The F1-generation was repeatedly sampled to evaluate temporal variation. A von Bertalanffy growth model indicated that reared Atlantic purebreds had a higher maximum length (26.2 cm) than Atlantic/Baltic hybrids (24.8 cm) at salinity 35, but not at salinity 16 (25.0 and 24.8 cm, respectively). In contrast, Atlantic/Baltic hybrids achieved larger size-at-age than the wild caught Baltic parental group. Mean vertebral counts and otolith aspect ratios were higher for reared Atlantic purebreds than Atlantic/Baltic hybrids, consistent with the differences between parental groups. There were no significant differences in vertebral counts and otolith aspect ratios between herring with the same genotype but raised in different salinities. A Canonical Analysis of Principal Coordinates was applied to analyze the variation in wavelet coefficients that described otolith shape. The first discriminating axis identified the differences between Atlantic purebreds and Atlantic/Baltic hybrids, while the second axis represented salinity differences. Assigning otoliths based on genetic groups (Atlantic purebreds vs. Atlantic/Baltic hybrids) yielded higher classification success (~90%) than based on salinities (16 vs. 35; ~60%). Our results demonstrate that otolith shape and vertebral counts have a significant genetic component and are therefore useful for studies on population dynamics and connectivity.

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“…Blue whiting spawning areas in the West of Ireland and Scotland (Gonçalves et al, 2017) would be less affected with potential positive impacts on local spawning in the Norwegian coast and the coast of Iceland. Similarly, local herring spawning in Norwegian coast might become more suitable (Berg et al, 2017).…”

Section: Discussionmentioning

confidence: 99%

Changes of potential catches for North-East Atlantic small pelagic fisheries under climate change scenarios

et al. 2020

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Small and intermediate-size pelagic fisheries are highly impacted by environmental variability and climate change. Their wide geographical distribution and high mobility makes them more likely to shift their distribution under climate change. Here, we explore the potential impact of different climate change scenarios on the four main commercial pelagic species in the North-East Atlantic (NEA): Atlantic mackerel (Scomber scombrus), European sprat (Sprattus sprattus), Atlantic herring (Clupea harengus) and blue whiting (Micromesistius poutassou).We used a process-based fisheries model (SS-DBEM), where all the target species were exploited at their maximum sustainable yield (MSY), to project future potential catches under a high and low future greenhouse gas scenario (RCP 2.6 and 8.5, respectively). Two ocean biogeochemical models (GDFL and MEDUSA) were used to force the environmental conditions. Mackerel and sprat are projected to have increases in a potential catch under both scenarios. Herring and blue whiting are projected to increase under the RCP2.6, but future projections under RCP8.5 show mixed responses with decreases or no changes forecasted.Overall, the potential catch is projected to increase in the northern area of the NEA but is projected to decrease in the southern area. These projected changes are mainly driven by changes in temperature and primary production. Shifts in the distribution of pelagic resources may destabilize existing international agreements on sharing of straddling resources as exemplified by the dispute in sharing of quota for Atlantic mackerel. Novel climate-ready policy approaches considering full species distribution are needed to complement current stock-based approaches.

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Spawning time of Atlantic herring ( Clupea harengus ) populations within a restricted area reflects their otolith growth at the larval stage

Cited by 13 publications

References 108 publications

A combination of genetic and phenotypic characterization of spring- and autumn-spawning herring suggests gene flow between populations

A combination of genetic and phenotypic characterization of spring- and autumn-spawning herring suggests gene flow between populations

Genetic factors have a major effect on growth, number of vertebrae and otolith shape in Atlantic herring (Clupea harengus)

Changes of potential catches for North-East Atlantic small pelagic fisheries under climate change scenarios

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