Bathymetric patterns of polychaete (Annelida) species richness in the continental shelf of the Gulf of California,Eastern Pacific |
| |
| Institution: | 1. Badley Ashton Associates Ltd. Winceby House, Winceby, Horncastle, Lincolnshire, UK;2. Eski?ehir Osmangazi University, Department of Geological Engineering, Eski?ehir, Turkey;3. Middle East Technical University, Department of Geological Engineering, Ankara, Turkey;4. Vrije University, Faculty of Earth and Life Science, Amsterdam, Netherlands;5. General Directorates of Mineral Research and Exploration, Department of Geological Research, Ankara, Turkey;1. Korea Polar Research Institute, 26 Songdomirae-ro, Yeonsu-gu, Incheon 406-860, Republic of Korea;2. Alfred Wegener Institute, Helmholtz Centre for Polar and Marine Research, Am Alten Hafen 26, 27568 Bremerhaven, Germany;1. Department of Internal Medicine, Erasmus MC, University Medical Centre Rotterdam, P.O. Box 2040, 3000 CA Rotterdam, The Netherlands;2. Department of Epidemiology and Biostatistics, EMGO Institute for Health and Care Research, VU University Medical Center, Van der Boechorststraat 7, 1081 BT Amsterdam, The Netherlands;3. Division of Human Nutrition, Wageningen University, P.O. Box 8129, 6700 EV Wageningen, The Netherlands;4. Department of Internal Medicine/Endocrinology, VU University Medical Center, P.O. Box 7057, 1007 MB Amsterdam, The Netherlands;5. Section of Geriatric Medicine, Department of Internal Medicine, Academic Medical Centre, Amsterdam, The Netherlands |
| |
| Abstract: | The mid-domain effect was tested to evaluate the bathymetric patterns of the polychaete species richness in the Upper and Lower Gulf of California as a possible hypothesis to explain the species richness gradient, exploring the overlapping of species depth ranges towards the middle continental shelf. The bathymetric gradient of the number of species was estimated with the depth ranges of 554 polychaete species, and the mid-domain effect was tested using a Monte Carlo simulation program at bands of 10 m depth. The Upper (251 species) and Lower (491 species) Gulf regions showed clear differences in their faunal composition (Jaccard similarity index = 0.34); the species richness pattern was characterized by a highly significant presence of polychaetes with short depth ranges (< 10 m). The richness distribution could be described as a cubic polynomial curve, but the maximum values in both Gulf regions (141 and 317 species, respectively for Upper and Lower Gulf regions) are strongly biased to shallow waters (40 m). This is not consistent with the peak of diversity at 60–70 m predicted by the model. The observed patterns cannot be reproduced by the mid-domain effect, suggesting the existence of non-random factors affecting the species richness gradients in the Gulf. |
| |
| Keywords: | |
| 本文献已被 ScienceDirect 等数据库收录！ |
|
