Wyniki wyszukiwania

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The effect of habitat in biasing fish abundance and species richness estimates when using various sampling methods in streams

100%

Bayley P. B., Dowling D. C.

Polskie Archiwum Hydrobiologii

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1993

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tom 40

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nr 1

2

Artykuł dostępny w postaci pełnego tekstu - kliknij by otworzyć plik

Acoustical estimation of fish distribution and abundance in two Spitsbergen fjords

67%

Szczucka J., Hoppe L., Schmidt B., Fey D. P.

Oceanologia

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2017

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tom 59

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nr 4

Over recent decades, the Arctic region has been subjected to rapid climate change stemming from global warming. The advance of Atlantic waters to high latitudes is notable. The increased abundance of fish, such as cod (Gadus morhua) and haddock (Melanogrammus aeglefinus), has been reported near the western coast of Spitsbergen and entering fjords together with Atlantic waters. This study used multifrequency acoustics to measure fish distribution and abundance in 2013–2014 in two Arctic fjords, the colder Hornsund, which is typically of Arctic character, and the warmer Kongsfjorden, which is more of Atlantic character. The study revealed a bimodal fish size distribution with larger fish in the deep parts of fjords, and smaller fish distributed in more shallow waters. An evident increase in the abundance of large fish, most probably Atlantic cod, was observed in Hornsund and especially in Kongsfjorden in 2014 in comparison to 2013. The intense inflow of Atlantic water on the shelf in 2014 is suggested as the explanation for this phenomenon.

3

The role of land-inland water ecotones in fish ecology on the basis of Russian research - a review

67%

Dgebuadze Y. Y.

International Journal of Ecohydrology and Hydrobiology

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2001

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tom 01

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nr 1-2

This review summarises some results of investigation carried out by Russian scientists, concerning the influence of land/inland water ecotones on fish. The main objectives and hypotheses developing in the framework UNESCO MAB working group "Fish and land/inland ecotones" in Russia are: comparison of fish population in salmonid rivers affected or non-affected by lake-rivers ecotones; small scale ecotone studies of model and restored microhabitat of salmonid rivers; comparison of the ecotone patterns and fish abundance in two rivers differing by historical origin of their ichthyofauna; the analysis of the effect of cattle ranching on fish assemblages distribution, dynamics and productivity along a river course in the steppe zone; and the influence of periodically drying up lakes and ecotones on the dynamics of fish populations in the connected river system.

Ograniczanie wyników

1 International Journal of Ecohydrology and Hydrobiology

1 Oceanologia

1 Polskie Archiwum Hydrobiologii

1 Bayley P. B.

1 Dgebuadze Y. Y.

1 Dowling D. C.

1 Fey D. P.

1 Hoppe L.

1 Schmidt B.

1 Szczucka J.

1 2017

1 2001

1 1993

The effect of habitat in biasing fish abundance and species richness estimates when using various sampling methods in streams

Acoustical estimation of fish distribution and abundance in two Spitsbergen fjords

The role of land-inland water ecotones in fish ecology on the basis of Russian research - a review