文獻來源: Costa WJEM. 2009. Trophic radiation in the South American annual killifish genus Austrolebias (Cyprinodontiformes: Rivulidae). Ichthyological Exploratioin of Freshwaters 20(2): 179-191.Abstract
A comparative study, involving feeding items found in gut contents and morphological structures related to feeding habits, among 15 species of the South American annual killifish genus Austrolebias indicates a considerable intra-generic trophic radiation. Species of basal lineages are generalist aquatic invertebrate feeders with unspecialized morphological traits, while some lineages include species preferentially eating crustaceans or mollusks and fish. Bottom deposit feeding habits seems to be related to a basihyal with laterally expanded cartilage. Molluscivory as a main food item is found in A. wolterstorffi, which possesses modified robust teeth on the fifth ceratobranchial bone. Piscivory is considered as a unique evolutionary event arising in the ancestor of the clade including A. cheradophilus, A. elongatus and A. prognathus, the latter two species considered the most specialized predators, with lengthened jaw bones bearing numerous backwardly recurved teeth.
A comparative study, involving feeding items found in gut contents and morphological structures related to feeding habits, among 15 species of the South American annual killifish genus Austrolebias indicates a considerable intra-generic trophic radiation. Species of basal lineages are generalist aquatic invertebrate feeders with unspecialized morphological traits, while some lineages include species preferentially eating crustaceans or mollusks and fish. Bottom deposit feeding habits seems to be related to a basihyal with laterally expanded cartilage. Molluscivory as a main food item is found in A. wolterstorffi, which possesses modified robust teeth on the fifth ceratobranchial bone. Piscivory is considered as a unique evolutionary event arising in the ancestor of the clade including A. cheradophilus, A. elongatus and A. prognathus, the latter two species considered the most specialized predators, with lengthened jaw bones bearing numerous backwardly recurved teeth.
圖片連結: Sociedad Española de Killis (photo credit: R. Wildekamp),
