Morphological differences between two ecologically similar sympatric fishes

被引:27
|
作者
Helland, I. P. [1 ,2 ]
Vollestad, L. A. [2 ]
Freyhof, J. [1 ]
Mehner, T. [1 ]
机构
[1] Leibniz Inst Freshwater Ecol & Inland Fisheries, Dept Biol & Ecol Fishes, D-12561 Berlin, Germany
[2] Univ Oslo, Dept Biol, Ctr Ecol & Evolutionary Synth, N-0316 Oslo, Norway
关键词
coexistence; competition; morphometrics; planktivores; reproductive isolation; DIEL VERTICAL MIGRATIONS; GEOMETRIC MORPHOMETRICS; RESOURCE POLYMORPHISM; POPULATION-STRUCTURE; SWIMMING SPEED; SPECIES PAIR; LAKE; COMPETITION; TEMPERATURE; DIVERGENCE;
D O I
10.1111/j.1095-8649.2009.02476.x
中图分类号
S9 [水产、渔业];
学科分类号
0908 ;
摘要
Morphological differentiation and microhabitat segregation of two ecologically similar populations of pelagic planktivorous fishes, Coregonus albula and the smaller Coregonus fontanae, were studied in Lake Stechlin (northern Germany). Both populations performed diel vertical migrations, although C. fontanae was always situated in deeper pelagic water than C. albula both during day and night. Landmark-based geometric morphometrics revealed that sympatric C. albula and C. fontanae differ in external morphology, with main differences found in head length and eye position, as well as in length and width of the caudal peduncle. Moreover, while C. albula has a similar morphology over all sizes, the shape of C. fontanae changes with size. Accordingly, the morphology of the two is most different at smaller size. Although the morphological differences may reflect adaptations to the slightly differing microhabitats of the two populations, there is no conclusive evidence that this correspondence between ecology and morphology is the main mechanism behind the coexistence of the closely related coregonids in Lake Stechlin. (C) 2009 The Authors Journal compilation (C) 2009 The Fisheries Society of the British Isles
引用
收藏
页码:2756 / 2767
页数:12
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