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Stoichiometric imbalances between detritus and detritivores are related to shifts in ecosystem functioning
Umeå University, Faculty of Science and Technology, Department of Ecology and Environmental Sciences. Univ Tromso, Dept Arctic & Marine Biol, Tromso, Norway.
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2016 (English)In: Oikos, ISSN 0030-1299, E-ISSN 1600-0706, Vol. 125, no 6, 861-871 p.Article in journal (Refereed) PublishedText
Abstract [en]

How are resource consumption and growth rates of litter-consuming detritivores affected by imbalances between consumer and litter C:N:P ratios? To address this question, we offered leaf litter as food to three aquatic detritivore species, which represent a gradient of increasing body N: P ratios: a crustacean, a caddisfly and a stonefly. The detritivores were placed in microcosms and submerged in a natural stream. Four contrasting leaf species were offered, both singly and in two-species mixtures, to obtain different levels of stoichiometric imbalance between the resources and their consumers. The results suggest that detritivore growth was constrained by N rather than C or P, even though 1) the N: P ratios of the consumers' body tissue was relatively low and 2) microbial leaf conditioning during the experiment reduced the N:P imbalance between detritivores and leaf litter. This surprisingly consistent N limitation may be a consequence of cumulative N-demand arising from the production of N-rich chitin in the exoskeletons of all three consumer species, which is lost during regular moults, in addition to N-demand for silk production by the caddisfly. These N requirements are not commonly quantified in stoichiometric analyses of arthropod consumers. There was no evidence for compensatory feeding, but when offered mixed-species litter varying in C:N:P ratios, detritivores consumed more of the litter species showing the highest N:P and lowest C:N ratio, accelerating the mass loss of the preferred leaf species in the litter mixture. These results show that imbalances in consumer-resource stoichiometry can have contrasting effects on coupled processes, highlighting a challenge in developing a mechanistic understanding of the role of stoichiometry in regulating ecosystem processes such as leaf litter decomposition.

Place, publisher, year, edition, pages
2016. Vol. 125, no 6, 861-871 p.
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Ecology
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URN: urn:nbn:se:umu:diva-123060DOI: 10.1111/oik.02687ISI: 000377212000013OAI: oai:DiVA.org:umu-123060DiVA: diva2:952785
Available from: 2016-08-15 Created: 2016-06-27 Last updated: 2016-08-15Bibliographically approved

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Frainer, André
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