influence of light environment on depth of visual feeding by larvae and fry of Coregonus pollan (Thompson) in Lough Neagh

The depth limits for visual feeding by pollan larvae and fry, Coregonus pollan, were determined in Lough Neagh, Northern Ireland, by combining laboratory estimates of the minimum light threshold for feeding activity with field measurements of spectral, diurnal and seasonal changes in light penetrati...

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Veröffentlicht in:Journal of fish biology 1984-01, Vol.25 (2), p.173-181
Hauptverfasser: Dabrowski, K.R, Jewson, D.H
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container_title Journal of fish biology
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creator Dabrowski, K.R
Jewson, D.H
description The depth limits for visual feeding by pollan larvae and fry, Coregonus pollan, were determined in Lough Neagh, Northern Ireland, by combining laboratory estimates of the minimum light threshold for feeding activity with field measurements of spectral, diurnal and seasonal changes in light penetration. Although feeding thresholds were lowest in the blue light (400–490 nm), the rapid attenuation of this region in the lake meant that the depth limits of feeding in situ were determined by response to the green region (490–595 nm). Effects of changes in irradiance and light penetration on the depth of feeding are considered during a seasonal study. Increased sensitivity, as the juvenile stages develop, may be offset by reduced light penetration due to algal growth. Over an annual period the maximum feeding depth for pollan varied between 2.6 and 4.1 m. In the juvenile stages of two other predatory species from the lake, perch, Perca fluviatilis, and pike, Esox lucius, the corresponding ranges were 1.1–1.9 m and 2.7–4.6 m respectively.
doi_str_mv 10.1111/j.1095-8649.1984.tb04864.x
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Although feeding thresholds were lowest in the blue light (400–490 nm), the rapid attenuation of this region in the lake meant that the depth limits of feeding in situ were determined by response to the green region (490–595 nm). Effects of changes in irradiance and light penetration on the depth of feeding are considered during a seasonal study. Increased sensitivity, as the juvenile stages develop, may be offset by reduced light penetration due to algal growth. Over an annual period the maximum feeding depth for pollan varied between 2.6 and 4.1 m. 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Although feeding thresholds were lowest in the blue light (400–490 nm), the rapid attenuation of this region in the lake meant that the depth limits of feeding in situ were determined by response to the green region (490–595 nm). Effects of changes in irradiance and light penetration on the depth of feeding are considered during a seasonal study. Increased sensitivity, as the juvenile stages develop, may be offset by reduced light penetration due to algal growth. Over an annual period the maximum feeding depth for pollan varied between 2.6 and 4.1 m. In the juvenile stages of two other predatory species from the lake, perch, Perca fluviatilis, and pike, Esox lucius, the corresponding ranges were 1.1–1.9 m and 2.7–4.6 m respectively.</description><subject>Biological and medical sciences</subject><subject>Coregonus pollan</subject><subject>Feeding. Feeding behavior</subject><subject>Freshwater</subject><subject>Fundamental and applied biological sciences. 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source Wiley Online Library Journals Frontfile Complete
subjects Biological and medical sciences
Coregonus pollan
Feeding. Feeding behavior
Freshwater
Fundamental and applied biological sciences. Psychology
Vertebrates: anatomy and physiology, studies on body, several organs or systems
title influence of light environment on depth of visual feeding by larvae and fry of Coregonus pollan (Thompson) in Lough Neagh
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