NATIVE-NONNATIVE STATUS OF GAMBUSIA GEISERI (POECILIIDAE) IN WEST TEXAS WITH ASSESSMENT OF A MISSING MITOCHONDRIAL ANCESTOR OF GAMBUSIA SPECIOSA
| Autor: | Anthony A. Echelle, Wade D. Wilson, Michael R. Schwemm, Thomas T. Turner, Alice F. Echelle |
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| Rok vydání: | 2019 |
| Předmět: |
0106 biological sciences
0301 basic medicine Poeciliidae biology Phylogenetic tree Lineage (evolution) Haplotype Zoology Aquatic animal Introduced species biology.organism_classification 010603 evolutionary biology 01 natural sciences Gambusia Gambusia speciosa 03 medical and health sciences 030104 developmental biology Ecology Evolution Behavior and Systematics |
| Zdroj: | The Southwestern Naturalist. 63:161 |
| ISSN: | 0038-4909 |
| DOI: | 10.1894/0038-4909-63-3-161 |
| Popis: | It has been assumed that populations of Gambusia geiseri in the Colorado River and Rio Grande basins of Texas were introduced from the San Marcos area of east Texas by humans in the 1930s. This was questionable because of the paucity of early records of Gambusia from the region. Further, a congener, Gambusia speciosa, in the Rio Grande basin carries an apparently “foreign” mitochondrial cytochrome b gene (cytb) haplotype most similar to, but 2% divergent from, a haplotype previously reported for G. geiseri in the San Marcos River. This suggested the populations of G. geiseri outside of the San Marcos area might represent a divergent native lineage of the species. To address this, we assessed variation for cytb and a nuclear sequence (S7 intron 1) in G. geiseri from six spring systems supporting the species. The results suggest nonnative status for all populations of G. geiseri outside the Comal and San Marcos rivers. A phylogenetic analysis of cytb haplotypes in Gambusia species from Texas and northern Mexico demonstrates a sister relationship between G. geiseri and a missing ancestor involved in the mitochondrial ancestry of G. speciosa. |
| Databáze: | OpenAIRE |
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