Vertical distribution and trophic interactions of zooplankton and fish in Masfjorden, Norway

Giske, Jarl; Aksnes, Dag L.; Baliño, Beatriz M.; Kaartvedt, Stein; Lie, Ulf; Nordeide, Jarle Tryti; Salvanes, Anne Gro Vea; Wakili, Sami M.; Aadnesen, Agnes

doi:10.1080/00364827.1990.10413442

Cited by 142 publications

(142 citation statements)

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“…B. glaciale underPopulation genetic structure of the glacier lanternfish, Benthosema glaciale (Myctophidae) in Norwegian waters take diurnal vertical migrations to the shallow waters, and the daytime distribution of adult B. glaciale in Norwegian fjords is mainly restricted to the deep water column below sill depth (Kaartvedt & al. 1988;Giske & al. 1990).…”

Section: Introductionmentioning

confidence: 99%

Population genetic structure of the glacier lanternfish,Benthosema glaciale(Myctophidae) in Norwegian waters

Suneetha¹,

Salvanes²

2001

Sarsia

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It is hypothesised that the fjords with restricted water circulation may partially isolate fish populations living there. The pelagic life history stages of the mesopelagic lanternfish may potentially subject to dispersal over vast areas, preventing population subdivision. In the present paper, we test the hypothesis of no geographic population genetic structure of B. glaciale in Norwegian waters. Fish samples from six different locations, including five western fjords were analysed using allozyme electrophoresis. Among the 17 loci analysed, nine loci were polymorphic by 0.99 criterion. Deviation from the global (pooled sample) HW equilibrium was detected at two loci, AAT-2* and PGM*, in terms of heterozygote deficiency, indicating a possible population subdivision in the area studied. Supporting such postulate, the allele frequencies at several loci were found significantly different, consequently rejecting the null hypothesis. The individual fjord samples were different from the offshore sample, and some between-fjord heterogeneity in allele frequencies was also found. However, Wright's F ST value was apparently low, but significantly different from zero, indicating a low level of population differentiation in the area studied. Partial isolation of fjord units of B. glaciale as a possible mechanism for genetic differentiation is discussed.

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Section: Introductionmentioning

confidence: 99%

Population genetic structure of the glacier lanternfish,Benthosema glaciale(Myctophidae) in Norwegian waters

Suneetha¹,

Salvanes²

2001

Sarsia

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“…Light limitation in visual foraging-The present work and the study of Eiane et al (1997) emerged as a result of theoretical and experimental work on how predation by fish is affected by light and optical properties of prey and environment (Aksnes and Giske 1993;Giske et al 1994;Aksnes and Utne 1997;Utne 1997). Furthermore, field studies on the mesopelagic fish Maurolicus muelleri, an important zooplanktivore in Norwegian fjords, have revealed that both the feeding and the vertical behavior are highly sensitive to the prevailing light conditions of the water column (Giske and Notes Aksnes 1992;Baliño and Aksnes 1993;Rosland andGiske 1994, 1997).…”

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confidence: 98%

Fish or jellies—a question of visibility?

Eiane

Aksnes

Bagøien

et al. 1999

Limnology & Oceanography

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Light is an important limiting factor for the visual foraging process in fishes, and the light regime may potentially affect the competition between visual and tactile predators. We investigated two equal‐sized fjords of quite different pelagic food web structure. Earlier studies have revealed that the jellyfish Periphylla periphylla dominates Lurefjorden, while fish predators dominate in the other fjord, Masfjorden. Furthermore, the mesozooplankton stock of Lurefjorden is larger in both total biomass and size of the individuals. Hence, earlier hypotheses linking the competitive advantage of tactile gelatinous plankton predators to smaller sized mesozooplankton communities are unable to explain the present phenomenon. To see if the difference in the pelagic biota of the two fjords could be associated with characteristics of the light regime, we measured the light absorbance in the basin water of the two fjords. We found that, due to a slightly stronger influence of coastal water in the basin water of Lurefjorden, the exponential light absorbance coefficient below 100 m is two to three times higher there than in other fjords. This results in a reduction in light flux of several orders of magnitude, effectively reducing the possibility of visual foraging. The tactile mode of predation in jellyfish, however, is not influenced, and we hypothesize that the visibility regime has a decisive role in structuring the pelagic food webs of the two fjords.

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“…Both males and females of B. glaciale mature at age 2-3, when they are between 45-50 mm in length. B. glaciale spawns in fjords and along the Norwegian coast, and is an important food resource for several fish, especially for salmon along the coastal area (Giske et al 1990;Salvanes and Kristoffersen 2001;Salvanes 2004;Kristoffersen and Salvanes 2009). …”

Section: Fish Families Examined and Their Biologymentioning

confidence: 99%

Long Term Changes in Abundance and Spatial Distribution of Pelagic Agonidae, Ammodytidae, Liparidae, Cottidae, Myctophidae and Stichaeidae in the Barents Sea

Eriksen¹,

Прохорова²,

Johannesen³

2012

Diversity of Ecosystems

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Vertical distribution and trophic interactions of zooplankton and fish in Masfjorden, Norway

Cited by 142 publications

References 26 publications

Population genetic structure of the glacier lanternfish,Benthosema glaciale(Myctophidae) in Norwegian waters

Population genetic structure of the glacier lanternfish,Benthosema glaciale(Myctophidae) in Norwegian waters

Fish or jellies—a question of visibility?

Long Term Changes in Abundance and Spatial Distribution of Pelagic Agonidae, Ammodytidae, Liparidae, Cottidae, Myctophidae and Stichaeidae in the Barents Sea

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