The food of Norwegian spring-spawning herring in the western Norwegian Sea in relation to the annual cycle of zooplankton

Gíslason, Ástþór; Astthorsson, Olafur S.

doi:10.1080/00364820260294860

Cited by 50 publications

(36 citation statements)

References 11 publications

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“…Meyer-Harms et al 1999, Gislason & Astthorsson 2002. Additional interest in Calanus populations has come from analysis of long time series such as the Continuous Plankon Recorder survey (CPR) that has shown dramatic biogeographical shifts in calanoid copepod assemblages (Beaugrand et al 2002, Hays et al 2005.…”

Section: Introductionmentioning

confidence: 99%

Barriers in the pelagic: population structuring of Calanus helgolandicus and C. euxinus in European waters

Yebra

Bonnet²,

Harris³

et al. 2011

Mar. Ecol. Prog. Ser.

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Molecular studies of marine plankton have shown that ecological and/or environmental barriers play an important role in separating populations. Calanoid copepods are central in marine ecosystems, and dramatic biogeographical shifts in copepod assemblages associated with recent climate warming have been reported. We examined spatial population structuring in European waters of the Atlantic Ocean and Mediterranean Sea of Calanus helgolandicus and its sister species, C. euxi nus, from the Black Sea based on genetic and morphometric characters. The aims were to identify barriers to dispersal, relate these to hydrographic characteristics and infer historical patterns of distribution and demography. We analysed a 408 bp fragment of the mitochondrial 16S gene (316 individuals), prosome to urosome length relationships (212 individuals) and sea surface temperatures obtained from 19 European sites. Estimates of genetic differentiation between samples and hierarchical analyses of molecular variance indicated strong spatial population structuring between, as well as within, basins. We identified 7 phylogeographic groups: Fjords, Oceanic inflow, NE Atlantic/ Tyrrhenian, Adriatic, Mljet Island, Aegean, and Black Sea, which explained 39.7% of the total genetic variation. Based on genetic data, C. euxinus is considered to be a differentiated population within the C. helgolandicus distribution range because the most important genetic barrier separates western and eastern Mediterranean populations. Morphometric barriers largely reflect sea surface temperature barriers and are not congruent with the main genetic barriers. Contrary to recent findings for C. finmarchicus, we conclude that C. helgolandicus/C. euxinus populations are not connected by high levels of dispersal and have been vulnerable to past climatic changes.

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Section: Introductionmentioning

confidence: 99%

Barriers in the pelagic: population structuring of Calanus helgolandicus and C. euxinus in European waters

Yebra

Bonnet²,

Harris³

et al. 2011

Mar. Ecol. Prog. Ser.

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“…The fuels for 3 E-mail: oystein.varpe@unis.no this capital breeder strategy are gained rapidly, mostly during two months of the feeding migration (Varpe et al 2005). The main prey of herring are large individuals of the copepod Calanus finmarchicus, mainly copepodite stage 5 (C5) and adult (C6) females (Dalpadado et al 2000, Gislason andAstthorsson 2002). Because of the seasonal vertical migration of Calanus, these stages are available in two pulses: when the parent generation (G0) returns from the deep water diapause in early spring, and when the large stages of the next generation (G1) have developed some two to three months later (Heath et al 2000).…”

Section: Introductionmentioning

confidence: 99%

Seasonal plankton–fish interactions: light regime, prey phenology, and herring foraging

Varpe

Fiksen

2010

Ecology

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Abstract. When prey and predator are seasonal migrants, encounters depend on migration phenologies and environmental constraints on predation. Here we investigate the relative contribution of seasonality in irradiance and prey abundance in shaping the rapid seasonal body condition increase of a migrating predator searching visually for its prey: the Norwegian spring-spawning herring, Clupea harengus, feeding on the copepod Calanus finmarchicus. Two main seasonal pulses of prey are available to herring: (1) the parent generation of C. finmarchicus, with peak abundance in March-April, which appear too early to cause the main increase in herring condition; and (2) the abundant offspring generation of C. finmarchicus, with peak abundance in June-July, too late to explain the main increase in body condition. However, a mechanistic model of ingestion rate, including both solar irradiance and prey abundance, predicted seasonal food intake in good accordance with observed herring body condition. This suggests that the seasonality in herring foraging and energy storage is closely linked to the return of longer days in spring, and less dependent on a match or mismatch with seasonal peaks in abundance of their zooplankton prey. Consequently, light related constraints on foraging may make visually searching predators at high latitudes resilient to changes and fluctuations in prey phenology and abundance, but vulnerable to changes in the light regime, such as water clarity.

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“…Because of its enormous abundance it is the main food source for many commercially important fish species like Atlantic herring Clupea harengus and larval Atlantic cod Gadus morhua (Dalpadado et al 2000, Gaard & Reinert 2002, Gislason & Astthorsson 2002. C. finmarchicus itself exerts intense grazing pressure on phytoplankton blooms (Harvey 1936, Longhurst 1976, Dale et al 1999) and has long been viewed as a typical example of a herbivore filter-feeder (e.g.…”

Section: Introductionmentioning

confidence: 99%

Cannibalism by female Calanus finmarchicus on naupliar stages

Basedow¹,

Tande²

2006

Mar. Ecol. Prog. Ser.

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The food of Norwegian spring-spawning herring in the western Norwegian Sea in relation to the annual cycle of zooplankton

Cited by 50 publications

References 11 publications

Barriers in the pelagic: population structuring of Calanus helgolandicus and C. euxinus in European waters

Barriers in the pelagic: population structuring of Calanus helgolandicus and C. euxinus in European waters

Seasonal plankton–fish interactions: light regime, prey phenology, and herring foraging

Cannibalism by female Calanus finmarchicus on naupliar stages

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The food of Norwegian spring-spawning herring in the western Norwegian Sea in relation to the annual cycle of zooplankton

Cited by 50 publications

References 11 publications

Barriers in the pelagic: population structuring of Calanus helgolandicus and C. euxinus in ­European waters

Barriers in the pelagic: population structuring of Calanus helgolandicus and C. euxinus in ­European waters

Seasonal plankton–fish interactions: light regime, prey phenology, and herring foraging

Cannibalism by female Calanus finmarchicus on naupliar stages

Contact Info

Product

Resources

About

Barriers in the pelagic: population structuring of Calanus helgolandicus and C. euxinus in European waters

Barriers in the pelagic: population structuring of Calanus helgolandicus and C. euxinus in European waters