Environmental Biology of Fishes

, Volume 24, Issue 3, pp 199–218 | Cite as

Trophic ecomorphology in eastern Pacific blennioid fishes: character transformation of oral jaws and associated change of their biological roles

  • Kurt Kotrschal
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Synopsis

The ecomorphological relationships between the oral jaws and food spectra were highlighted in 34 species of Gulf of California blennioid fishes (5 Tripterygiidae, 13 Labrisomidae, 11 Chaenopsidae and 5 Blenniidae). Twenty-nine species are microcarnivorous, two are omnivorous browsers, two are algae grazers and one was an ‘ectoparasite’ feeder. The spectrum of oral (as opposed to pharyngeal) jaw (OJA) morphology ranges from plesiomorphic, suction-feeding (relatively large, protrusible jaws, with many coniform-caniniform teeth) to apomorphic, biting (relatively small, non protrusible jaws, with a single row of incisiform teeth). As species with similar morphology may widely differ in food, it is concluded, that morphology is not a reliable predictor for ecology in this case. With the exception of a few specialists, species with apomorphic, biting OJA utilize sessile items in addition to mobile categories and thus show a higher food diversity as compared to species with plesiomorphic OJA. Thus in the present case morphological differentiation goes along with ecological generalization. Only three blenniid species with the most apomorphic OJA may be considered as specialized also with regard to food resource utilization. Transformation of morphological characters and the ecological role of the OJA of blennioids may serve as a model to illustrate the steps required to achieve a biting-browsing and grazing feeding apparatus in many taxa of modern acanthopterygian reef fishes.

Key words

Blenniidae Chaenopsidae Evolution Generalization Labrisomidae Morphological series Oral jaw apparatus Specialization Tripterygiidae 

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Copyright information

© Kluwer Academic Publishers 1989

Authors and Affiliations

  • Kurt Kotrschal
    • 1
  1. 1.Zoologisches Institut der Universität SalzburgSalzburgAustria

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