Secondary Production of Highly Unsaturated Fatty Acids by Zoobenthos Across Rivers Contrasting in Temperature

Тип публикации: статья из журнала

Год издания: 2016

Идентификатор DOI: 10.1002/rra.2945

Ключевые слова: essential polyunsaturated fatty acids, river zoobenthos, secondary production, biodiversity, water temperature, climate warming, biodiversity, climate warming, essential polyunsaturated fatty acids, river zoobenthos, secondary production, water temperature, Animalia

Аннотация: Highly unsaturated fatty acids (HUFA), namely eicosapentaenoic acid (20:5n-3, EPA) and docosahexaenoic acid (22:6n-3, DHA), which are essential for many animals, including humans, are mainly produced in aquatic trophic webs. In fast-flowing rivers, macrozoobenthos is the main source of HUFA for fish and may be particularly vulnerable to thermal alterations associated with climate change. We studied benthic communities in a unique natural ecosystem: the Yenisei River downstream of the dam of Krasnoyarsk Hydroelectric Power Station with very low temperature in summer because of discharge of cold water from deep in the reservoir and its tributaries with high summer temperature. This natural experiment' allowed to get rid of confounding factors, such as differences in light, seasonality, geology (biogeochemistry) and biogeography (regional species pools). As found, in spite of an increase of biodiversity and rates of daily production in warm rivers compared with cold sites, DHA and partly EPA production of zoobenthos decreased with the increase of temperature because of changes in species composition. Thus, in a climate warming context, we can predict a decrease of production of these HUFA by river zoobenthos and thereby a diminishing of their supply for fish and next to humans. Copyright (c) 2015 John Wiley & Sons, Ltd.

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Издание

Журнал: RIVER RESEARCH AND APPLICATIONS

Выпуск журнала: Vol. 32, Is. 6

Номера страниц: 1252-1263

ISSN журнала: 15351459

Место издания: HOBOKEN

Издатель: WILEY-BLACKWELL

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