Historical biogeography and distribution of the freshwater calanoid copepods (Crustacea: Copepoda) of the Yucatan Peninsula, Mexico
Aim: To determine and analyse the distribution of the freshwater calanoid copepod (Diaptomidae and Pseudodiaptomidae) fauna of the Yucatan Peninsula (YP) and its relation to the geological history of this Neotropical karstic plain. Location: The Yucatan Peninsula, Mexico. Methods: Plotting of geo-referenced sites, analysis of local and regional geological history, analysis and comparison of regional and local records. Results: The current composition and distribution of Diaptomidae and Pseudodiaptomidae in the YP mainly reflects recent, post-Pliocene colonization events. This invasion did not reach America, but only parts of Central America (CA). The presence of diaptomids in the continent since the pre-Cretaceous and the presumed post-Cretaceous (Palaeocene-Oligocene) radiation of Diaptomidae in Middle America suggest earlier colonizations of the YP. The marine transgressions kept most of the YP submerged in different geological periods, thus eliminating any original primary freshwater colonizers, such as the diaptomids. The periods of marine regression probably represented opportunities for new waves of diaptomid colonization of the YP. The latest dispersal of diaptomids in the YP during the Holocene (8000 yr bp) was probably an intermittent process because of the alternative dry and wet periods and interglacial transgressions.
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| Format: | Texto biblioteca |
| Language: | eng |
| Subjects: | Copépodos, Biogeografía histórica, Artfrosur, |
| Online Access: | http://onlinelibrary.wiley.com/doi/10.1111/j.1365-2699.2003.00958.x/full |
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| Summary: | Aim: To determine and analyse the distribution of the freshwater calanoid copepod (Diaptomidae and Pseudodiaptomidae) fauna of the Yucatan Peninsula (YP) and its relation to the geological history of this Neotropical karstic plain. Location: The Yucatan Peninsula, Mexico. Methods: Plotting of geo-referenced sites, analysis of local and regional geological history, analysis and comparison of regional and local records. Results: The current composition and distribution of Diaptomidae and Pseudodiaptomidae in the YP mainly reflects recent, post-Pliocene colonization events. This invasion did not reach America, but only parts of Central America (CA). The presence of diaptomids in the continent since the pre-Cretaceous and the presumed post-Cretaceous (Palaeocene-Oligocene) radiation of Diaptomidae in Middle America suggest earlier colonizations of the YP. The marine transgressions kept most of the YP submerged in different geological periods, thus eliminating any original primary freshwater colonizers, such as the diaptomids. The periods of marine regression probably represented opportunities for new waves of diaptomid colonization of the YP. The latest dispersal of diaptomids in the YP during the Holocene (8000 yr bp) was probably an intermittent process because of the alternative dry and wet periods and interglacial transgressions. |
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