NDLI: Elemental ratios (C:N) and stable isotopic composition of dominant rotifer species in a tropical eutrophic alkaline

Content Provider	Springer Nature Link
Author	Chemoiwa, Emily Jepyegon Oyoo Okoth, Elijah Mugo Bundi, James Njenga, Elizabeth W. Matany, Esther C. Korir, Regina J. Ngugi, Charles C.
Copyright Year	2014
Abstract	Rotifers dominate zooplankton biomass of many aquatic environments. However, their link to food web biomass has rarely been elucidated in alkaline–saline lakes. Variations in C content, C:N ratio and stable isotope composition (δ13C, δ15N) of dominant rotifer species were studied from January to December 2008 in alkaline–saline Lake Nakuru to provide insights into their bioenergetics. We established that Brachionus dimidiatus dominated in terms of abundance (80,000–100,000 × 103 ind m−3) and C-biomass. Also B. dimidiatus constituted about 60–75% of the rotifer biomass in the samples. All the rotifer species exhibited significant (P < 0.05) seasonal differences in biomass, C and C:N ratios. Rotifers had lower mean δ13C than course particulate organic matter, fine particulate organic matter and fish, but higher than mean δ13C in the dominant phytoplankton species. In all species, δ13C and δ15N increased markedly during the rainy season reflecting the feeding onset on allochthonous food sources. The isotopic increase correlated with an increase in their C:N. Our results demonstrate that rotifers respond quickly to any increase in primary production and can cope with changes in its nature and timing.
Starting Page	97
Ending Page	110
Page Count	14
File Format	PDF
ISSN	00188158
Journal	Hydrobiologia
Volume Number	747
Issue Number	1
e-ISSN	15735117
Language	English
Publisher	Springer International Publishing
Publisher Date	2014-12-05
Publisher Place	Cham
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Carbon biomass C:N ratios δ13C δ15N Rotifer biomas Zooplankton abundance Rotifer diversity Freshwater & Marine Ecology Ecology Zoology
Content Type	Text
Resource Type	Article
Subject	Aquatic Science

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