Benthic mats offer a potential subsidy to pelagic consumers in tundra pond food webs
Mariash, H., Devlin, S., Forsström, L., Jones, R., & Rautio, M. (2014). Benthic mats offer a potential subsidy to pelagic consumers in tundra pond food webs. Limnology and Oceanography, 59 (3), 733-744. doi:10.4319/lo.2014.59.3.0733 Retrieved from http://aslo.org/lo/pdf/vol_59/issue_3/0733.pdf
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Limnology and OceanographyDate
2014Discipline
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© The Association for the Sciences of Limnology and Oceanography, Inc. This is an open access article published by ASLO. Published in this repository with the kind permission of the publisher.
We quantified the potential nutritional contribution of benthic mats to pelagic consumers in tundra ponds
using three approaches. (1) We compared benthic and pelagic habitats based on their algal biomass and
community composition and assessed the dietary quality in terms of fatty acid (FA) concentrations in both
habitats. The algal community compositions differed significantly between habitats. Both benthic and pelagic
habitats contained saturated and unsaturated FAs, but on average there were more FAs relative to carbon in the
pelagic habitat (44 6 29 mg mg C21) than the benthic habitat (23 6 18 mg mg C21) across all studied ponds. (2)
We quantified the contribution of benthic mats to the whole-lake FA pool and found that benthic mats dominate
(on average . 90%) the basal FA resource within tundra ponds. (3) Using a series of feeding experiments, we
found that Daphnia survival and FA concentrations increased when a benthic mat slurry supplemented low
concentrations of phytoplankton. However, Daphnia could not survive solely on benthic mats, and nor did
benthic mats increase adult Daphnia survival when mats were offered as coherent pieces. The extent to which
pelagic consumers could be supported by benthic production challenges the view that benthic habitats are
functionally separate from the pelagic food webs within northern lake ecosystems.
...


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American Society of Limnology and Oceanography, Inc.ISSN Search the Publication Forum
0024-3590
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