Crater lake cichlids individually specialize along the benthic-limnetic axis

Kusche, Henrik; Recknagel, Hans; Elmer, Kathryn R.; Meyer, Axel

Crater lake cichlids individually specialize along the benthic-limnetic axis

Dateien

Kusche_280588.pdfGröße: 840.14 KBDownloads: 382

Datum

2014

Angaben zur Forschungsförderung

European Union (EU): 293700

Projekt

Comparative genomics of parallel in repeated adaptive radiations (GenAdap)

Open Access-Veröffentlichung

Open Access Gold

Sammlungen

Biologie

Publikationstyp

Zeitschriftenartikel

Publikationsstatus

Published

Erschienen in

Ecology and Evolution. 2014, 4(7), pp. 1127-1139. ISSN 2045-7758. eISSN 2045-7758. Available under: doi: 10.1002/ece3.1015

Zusammenfassung

A common pattern of adaptive diversification in freshwater fishes is the repeated evolution of elongated open water (limnetic) species and high-bodied shore (benthic) species from generalist ancestors. Studies on phenotype-diet correlations have suggested that population-wide individual specialization occurs at an early evolutionary and ecological stage of divergence and niche partitioning. This variable restricted niche use across individuals can provide the raw material for earliest stages of sympatric divergence. We investigated variation in morphology and diet as well as their correlations along the benthic-limnetic axis in an extremely young Midas cichlid species, Amphilophus tolteca, endemic to the Nicaraguan crater lake Asososca Managua. We found that A. tolteca varied continuously in ecologically relevant traits such as body shape and lower pharyngeal jaw morphology. The correlation of these phenotypes with niche suggested that individuals are specialized along the benthic-limnetic axis. No genetic differentiation within the crater lake was detected based on genotypes from 13 microsatellite loci. Overall, we found that individual specialization in this young crater lake species encompasses the limnetic- as well as the benthic macro-habitat. Yet there is no evidence for any diversification within the species, making this a candidate system for studying what might be the early stages preceding sympatric divergence.

Fachgebiet (DDC)

570 Biowissenschaften, Biologie

Schlagwörter

Benthic-limnetic axis, divergent selection, ecological opportunity, individual specialization, parallel evolution, phenotype-diet correlation

Zitieren

ISO 690

KUSCHE, Henrik, Hans RECKNAGEL, Kathryn R. ELMER, Axel MEYER, 2014. Crater lake cichlids individually specialize along the benthic-limnetic axis. In: Ecology and Evolution. 2014, 4(7), pp. 1127-1139. ISSN 2045-7758. eISSN 2045-7758. Available under: doi: 10.1002/ece3.1015

BibTex

@article{Kusche2014-04Crate-28058,
  year={2014},
  doi={10.1002/ece3.1015},
  title={Crater lake cichlids individually specialize along the benthic-limnetic axis},
  number={7},
  volume={4},
  issn={2045-7758},
  journal={Ecology and Evolution},
  pages={1127--1139},
  author={Kusche, Henrik and Recknagel, Hans and Elmer, Kathryn R. and Meyer, Axel}
}

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