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Digestive Protease Activity in Planktonic Crustaceans Feeding at Different Trophic Levels

Published online by Cambridge University Press:  11 May 2009

M. Kumlu  and
D.A. Jones
M. Kumlu
Affiliation:
University of Çukurova, School of Fisheries, 01330, Balcali, Adana, Türkiye.
D.A. Jones
Affiliation:
University of Wales, Bangor, School of Ocean Sciences, Menai Bridge, Gwynedd, LL59 5EY
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Extract

Trypsin-like enzyme activity of the larvae of two planktonic predatory crustaceans, Homarus gammarus and Nephrops norvegicus (Decapoda: Nephropidae) and the omnivorous larvae of Carcinus maenas (Decapoda: Brachyura) were investigated at each larval stage until metamorphosis. Two copepods, herbivorous or omnivorous grazers, Centropages typicus and Temora longicornis (Copepoda: Calanoidae) were also investigated for this enzyme. A comparison of trypsin-like activity in these and other decapod larvae shows a pattern with high levels in herbivores, low levels in carnivores and intermediate levels in omnivores. Herbivorous planktonic crustaceans appear to rely on high digestive enzyme activities to extract nutrients from less digestible algae or particulates, whereas carnivorous larvae have limited enzymatic capacity as they feed at higher trophic levels upon large and easily digestible prey. Omnivorous Carcinus maenas larvae have intermediate levels of digestive enzymes and are able to transfer between herbivorous and omnivorous feeding.

Type
Research Article
Information
Journal of the Marine Biological Association of the United Kingdom , Volume 77 , Issue 1 , February 1997 , pp. 159 - 165
Copyright
Copyright © Marine Biological Association of the United Kingdom 1997

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