Evol Ecol Res 10: 373-390 (2008) Full PDF if your library subscribes.
Co-existence of a pair of pelagic planktivorous coregonid fishes
Ingeborg Palm Helland,1* Chris Harrod,2,3 Jörg Freyhof 1 and Thomas Mehner1
1Department of Biology and Ecology of Fishes, Leibniz-Institute of Freshwater Ecology and Inland Fisheries, Berlin, Germany, 2Department of Evolutionary Genetics, Max Planck Institute for Limnology, Plön, Germany and 3School of Biological Sciences, Queen’s University Belfast, Belfast, UK
Address all correspondence to I.P. Helland, Department of Biology and Ecology of Fishes, Leibniz-Institute of Freshwater Ecology and Inland Fisheries, PO Box 850 119, D-12561 Berlin, Germany.
Hypothesis: Ecological specialization facilitates co-existence of Coregonus spp. in Lake Stechlin. A difference in trophic ecology is the dominant means by which the species are ecologically segregated.
Background: Sympatric fish species pairs in post-glacial lakes often feed on different resources, segregating available trophic resources.
Organisms: Sympatric European winter-spawning Coregonus albula and the local endemic dwarf-sized spring-spawning Coregonus fontanae.
Time and place: March–December 2005, Lake Stechlin, North Germany.
Methods: By combining stomach content analyses and stable isotope analyses we compared consumption patterns of the two species at different depths over a 10-month period.
Results: Stable isotope analyses and stomach content analyses both showed little trophic difference between the two species, but a significant effect of capture depth and body size on individual diet.
Conclusions: The sympatric species pair in Lake Stechlin does not follow the expected pattern of niche segregation. Trophic divergence is not the dominant grounds for co-existence.
Keywords: δ13C, δ15N, niche overlap, reproductive isolation, resource competition, stable isotope analysis, stomach content analysis, sympatric species.
DOWNLOAD A FREE, FULL PDF COPY
IF you are connected using the IP of a subscribing institution (library, laboratory, etc.)
or through its VPN.
© 2008 Ingeborg Palm Helland. All EER articles are copyrighted by their authors. All authors endorse, permit and license Evolutionary Ecology Ltd. to grant its subscribing institutions/libraries the copying privileges specified below without additional consideration or payment to them or to Evolutionary Ecology, Ltd. These endorsements, in writing, are on file in the office of Evolutionary Ecology, Ltd. Consult authors for permission to use any portion of their work in derivative works, compilations or to distribute their work in any commercial manner.
Subscribing institutions/libraries may grant individuals the privilege of making a single copy of an EER article for non-commercial educational or non-commercial research purposes. Subscribing institutions/libraries may also use articles for non-commercial educational purposes by making any number of copies for course packs or course reserve collections. Subscribing institutions/libraries may also loan single copies of articles to non-commercial libraries for educational purposes.
All copies of abstracts and articles must preserve their copyright notice without modification.