Patterns of endemism of the eastern North American cave fauna
- Permanent Link:
- Patterns of endemism of the eastern North American cave fauna
- Series Title:
- Journal of Biogeography
- Christman, Mary C.
Culver, David C.
Madden, Molly K.
- Publication Date:
- Subjects / Keywords:
- Caves ( local )
Disjunction ( local )
Dispersal ( local )
Endemism ( local )
Karst ( local )
Localized Endemics ( local )
Spatial Statistics ( local )
Troglobionts ( local )
Usa ( local )
- serial ( sobekcm )
- Aim: Over 250 species of obligate terrestrial caveâ€dwelling animals (troglobionts) are known from single caves in the eastern United States. We investigate their geographical distribution, especially in relation to other troglobionts. We relate these patterns to taxonomic group, opportunities for dispersal and geographical location.
Location Caves of the United States east of the Mississippi River.
Methods: We associated over 3000 records of more than 450 troglobiotic species and subspecies with hexagons of 1000, 5000 and 10,000 km2 in size. We calculated Moran's I , blackâ€“white joins and cubic regression of endemics on nonâ€endemics at all three spatial scales. For 5000 km2 hexagons, we modelled the spatial autocorrelation of the residuals of the cubic regression of endemics on nonâ€endemics.
Results: Differences among orders in percentage singleâ€cave endemism were not significant, except for Pseudoscorpionida, which was higher (69%) than any other order. At all three scales, Moran's I and blackâ€“white joins were significant, indicating a clumped distribution of both singleâ€cave endemics and other troglobionts. Spatial patterns were similar at all three scales and Moran's I was highest at 5000 km2. The cubic fit of endemics to nonâ€endemics was consistently better, with less systematic error or residuals, than were linear or quadratic models. Residuals showed a significant geographical pattern with excess endemics in more southerly locations.
Main conclusions: There was both a nonâ€spatial and spatial component to the pattern of singleâ€cave endemism. The nonâ€spatial component was the association of high levels of singleâ€cave endemism with areas of high diversity of nonâ€endemics. It may be that both are high because of high secondary productivity. Spatially, singleâ€cave endemism is high in central rather than peripheral areas and in the southern part of the range. It is not higher in areas of more dissected limestone, which would reduce migration rates; if anything endemism is lower. Regional spatial effects are impor
- Original Version:
- Journal of Biogeography, Vol. 32, no. 8 (2005-06-02).
- Source Institution:
- University of South Florida Library
- Holding Location:
- University of South Florida
- Rights Management:
- This object is protected by copyright, and is made available here for research and educational purposes. Permission to reuse, publish, or reproduce the object beyond the bounds of Fair Use or other exemptions to copyright law must be obtained from the copyright holder.
No images or PDF downloads are available for this resource.
Cras ut cursus ante, a fringilla nunc. Mauris lorem nunc, cursus sit amet enim ac, vehicula vestibulum mi. Mauris viverra nisl vel enim faucibus porta. Praesent sit amet ornare diam, non finibus nulla.
Cras efficitur magna et sapien varius, luctus ullamcorper dolor convallis. Orci varius natoque penatibus et magnis dis parturient montes, nascetur ridiculus mus. Fusce sit amet justo ut erat laoreet congue sed a ante.
Phasellus ornare in augue eu imperdiet. Donec malesuada sapien ante, at vehicula orci tempor molestie. Proin vitae urna elit. Pellentesque vitae nisi et diam euismod malesuada aliquet non erat.
Nunc fringilla dolor ut dictum placerat. Proin ac neque rutrum, consectetur ligula id, laoreet ligula. Nulla lorem massa, consectetur vitae consequat in, lobortis at dolor. Nunc sed leo odio.