Ostracoda: new aspects of their biogeography
McKenzie, K.G. (1986). Ostracoda: new aspects of their biogeography, in: Gore, R.H. et al. Crustacean biogeography. Crustacean Issues, 4: pp. 257-277
In: Gore, R.H.; Heck, K.L. (1986). Crustacean biogeography. Crustacean Issues, 4. A.A. Balkema: Rotterdam. ISBN 90-6191-593-7. 292 pp., more
In: Schram, F.R. (Ed.) Crustacean Issues. Balkema/CRC Press/Taylor & Francis: Rotterdam. ISSN 0168-6356; e-ISSN 2155-5397, more
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| Abstract |
The approach to biogeography by modern ostracodologists, while continuing to rely on uniformitarian principles, takes account of a large amount of new basic data, much of it from hitherto little known regions and little studied geological periods. Environmental factors are now examined more precisely. In particular, recent research has concentrated upon carbonate equilibrium, oxygen content, osmoregulation, food supply, trace elements, and solute composition, in addition to more familiar factors such as salinity, temperature, depth and substrate. In the context of the space-time continuum, recent work tends increasingly to postulate the existence of mosaic evolution. Ostracode geneticists have recorded a diversity of karyotype patterns which are consistent with the mosaic evolution hypothesis, and which can be interpreted meaningfully for the better elucidation of persistent biogeographic problems, such as the implications of partheno-genesis for distributions of continental taxa. Among the many dispersal mechanisms recently studied, greater emphasis is now given to the role of man, citing the historically well-documented example of the introduction of ostracodes into the Italian rice fields ecosystem. There is also a greater reliance on Ostracoda in biostratigraphy, particularly in relation to changes in sea level, climate and a paleogeography disposed in accordance with Expanding Earth as well as Plate Tectonic theories. Economic applications continue to provide solid incentives for much ostracode-based biogeographic analysis. |
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