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Grasping ecological opportunities: not one but five paedophagous species of Haplochromis (Teleostei: Cichlidae) in the Lake Edward system

  • ADVANCES IN CICHLID RESEARCH III
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Abstract

The Lake Edward system in Eastern Central Africa, including Lakes Edward and George and their associated rivers, is home to a species assemblage of endemic haplochromine cichlids. Currently, 36 of these species have been formally described, while it is estimated that the system may harbour a total of 60 species. Species flocks of haplochromine cichlids are morphologically and ecologically very diverse and have radiated into many specialised trophic niches. Paedophagy is the feeding on eggs and larvae. In Haplochromis, most paedophages steal fry and eggs from the buccal cavities of mouthbrooding female cichlids. Hitherto, one formally described species with this diet is known from the Lake Edward system: Haplochromis taurinus. We performed a morphometrical revision of all species of Haplochromis from this system with a morphology that suggests a paedophagous diet: long oral jaws set with small teeth. Sixty-eight specimens were studied by taking 28 measurements and 20 counts and by performing stomach content observations. We discovered that H. paradoxus also had a paedophagous diet. Our analyses further revealed the presence of three new species: H. gracilifur sp. nov., H. molossus sp. nov., and H. relictidens sp. nov. All five of these species were described or redescribed.

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Acknowledgements

This research is part of the BELSPO (Belgian Science Policy) funded BRAIN project “HIPE”: Human impacts on ecosystem health and resources of Lake Edward. Fieldwork of M. Van Steenberge was supported by the research foundation Flanders (FWO, V435116 N) and the King Leopold III Fund for Nature Exploration and Conservation. We thank M. Mulongaibalu (UoB) and L. Mwaiswa for their help in collecting specimens and E. Decru (RMCA) for her contributions to the research and her helpful comments. We are grateful to A. Reygel (RMCA) for drawing the figures of all specimens, to J. Brecko (RMCA) for taking pictures of the pharyngeal jaws in the framework of the DIGIT03 project, and to M. Parrent (RMCA) for curatorial services.

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Correspondence to Nathan Vranken.

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Guest editors: S. Koblmüller, R. C. Albertson, M. J. Genner, K. M. Sefc & T. Takahashi / Advances in Cichlid Research III: Behavior, Ecology and Evolutionary Biology

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Vranken, N., Van Steenberge, M. & Snoeks, J. Grasping ecological opportunities: not one but five paedophagous species of Haplochromis (Teleostei: Cichlidae) in the Lake Edward system. Hydrobiologia 832, 105–134 (2019). https://doi.org/10.1007/s10750-018-3742-5

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