Habitat structure influences the presence of sand skinks (Plestiodon reynoldsi) in altered habitats
David A. Pike A B C , Kelley S. Peterman A and Jay H. Exum AA Environmental Services Group, Glatting Jackson Kercher Anglin Inc., 120 North Orange Avenue, Orlando, FL 32801, USA.
B Present Address: School of Biological Sciences A08, University of Sydney, NSW 2006, Australia.
C Corresponding author. Email: david.pike@bio.usyd.edu.au
Wildlife Research 35(2) 120-127 https://doi.org/10.1071/WR07119
Submitted: 23 August 2007 Accepted: 11 February 2008 Published: 21 April 2008
Abstract
We studied a fossorial endemic lizard (the sand skink, Plestiodon reynoldsi) to determine habitat structural and vegetation associations in altered habitats at micro-, local, and macroscales. Lizards were present in each of the structural categories and vegetation types we studied, although active orange groves negatively influenced distribution and relative density (determined as the proportion of coverboards within a sampling plot containing signs of sand skink presence). Conversely, relative densities were highest in forested habitats, which contain structural features similar to natural habitats. Sand skinks readily used the two soil types at our site, although the greatest densities were in sampling plots containing both types. We conclude that conditions are suitable for sand skink habitation within a variety of habitats with different structures, including those altered by humans. However, in all cases the underlying soil was also loose and dry, making fossorial locomotion possible for this species. Three lines of evidence suggest that populations in altered habitats were resident, rather than transient: (1) sand skinks are still present in altered habitats more than 35 skink generations after alteration occurred; (2) there was no relationship between sand skink density and distance to natural habitat; and (3) a very small portion of our site (<2%) consisted of natural habitat, which is most likely too small to be a long-term source population to nearby altered habitats. Our results indicate that although P. reynoldsi is often considered habitat-specific, this notion may be due to focusing sampling efforts on natural rather than disturbed habitats. Therefore, relying on preconceived notions of habitat associations may not be sufficient to understand the ecological relationships and local-scale distribution of this threatened species. Using such misinformation may lead to the design and implementation of inadequate conservation plans that ignore altered habitats in which focal species occur.
Acknowledgements
K. Nelson, R. Mejeur, and K. Pedone assisted with much of the fieldwork. The McCoy/Mushinsky laboratory at the University of South Florida, R. Mejeur, and anonymous reviewers helped focus an earlier draft through insightful comments, and we graciously thank E. McCoy and N. Halstead for their contributions. During manuscript preparation DAP was supported by an Australian Endeavour International Postgraduate Research Scholarship, a University of Sydney International Postgraduate Award (each to DAP), and an Australian Research Council Federation Fellowship (to R. Shine). All work was coordinated through the United States Fish and Wildlife Service following approved guidelines.
Andrews, R. M. (1994). Activity and thermal biology of the sand-swimming skink Neoseps reynoldsi: diel and seasonal patterns. Copeia 1994, 91–99.
| Crossref | GoogleScholarGoogle Scholar |
Collinge, S. K. (2000). Effects of grassland fragmentation on insect species loss, colonization, and movement patterns. Ecology 81, 2211–2226.
Franken, R. J. , and Hik, D. S. (2004). Influence of habitat quality, patch size and connectivity on colonization and extinction dynamics of collared pikas Ochotona collaris. Journal of Animal Ecology 73, 889–896.
| Crossref | GoogleScholarGoogle Scholar |
![](../../media/share/OpenURL_Image.gif)
Haddad, N. , and Tewksbury, J. J. (2005). Low-quality habitat corridors as movement conduits for two butterfly species. Ecoogical Applications 15, 250–257.
| Crossref | GoogleScholarGoogle Scholar |
![](../../media/share/OpenURL_Image.gif)
Lemmon, P. E. (1956). A spherical densiometer for estimating forest overstory density. Forest Science 2, 314–320.
![](../../media/share/OpenURL_Image.gif)
Lindenmayer, D. B. , Possingham, H. P. , Lacy, R. C. , McCarthy, M. A. , and Pope, M. L. (2003). How accurate are population models? Lessons from landscape-level tests in a fragmented system. Ecology Letters 6, 41–47.
| Crossref | GoogleScholarGoogle Scholar |
![](../../media/share/OpenURL_Image.gif)
McConnell, K. , and Menges, E. S. (2002). Effects of fire and treatments that mimic fire on the Florida endemic scrub buckwheat (Eriogonum longifolium Nutt. var. gnaphalifolium Gandog.). Natural Areas Journal 22, 194–202.
![](../../media/share/OpenURL_Image.gif)
McCoy, E. D. , Sutton, P. E. , and Mushinsky, H. R. (1999). The role of guesswork in conserving the threatened sand skink. Conservation Biology 13, 190–194.
| Crossref | GoogleScholarGoogle Scholar |
![](../../media/share/OpenURL_Image.gif)
Means, D. B. , and Simberloff, D. (1987). The peninsula effect: habitat-correlated species decline in Florida’s herpetofauna. Journal of Biogeography 14, 551–568.
| Crossref | GoogleScholarGoogle Scholar |
![](../../media/share/OpenURL_Image.gif)
Pike, D. A. , Peterman, K. S. , and Exum, J. H. (2007). Use of altered habitats by the endemic Plestiodon reynoldsi Stejneger (sand skink). Southeastern Naturalist 6, 715–726.
| Crossref | GoogleScholarGoogle Scholar |
![](../../media/share/OpenURL_Image.gif)
Pike, D. A. , Peterman, K. S. , Mejeur, R. S. , Nelson, K. D. , Green, M. D. , and Exum, J. H. (2008). Sampling techniques and methods for determining the spatial distribution of sand skinks (Plestiodon reynoldsi). Florida Scientist 71, 93–104.
![](../../media/share/OpenURL_Image.gif)
Pringle, R. M. , Webb, J. K. , and Shine, R. (2003). Canopy structure, microclimate, and habitat selection by a nocturnal snake, Hoplocephalus bungaroides. Ecology 84, 2668–2679.
| Crossref | GoogleScholarGoogle Scholar |
![](../../media/share/OpenURL_Image.gif)
Schmitz, A. , Mausfeld, P. , and Embert, D. (2004). Molecular studies on the genus Eumeces Wiegmann, 1834: phylogenetic relationships and taxonomic implications. Hamadryad 28, 73–89.
![](../../media/share/OpenURL_Image.gif)
Schneider, M. F. (2001). Habitat loss, fragmentation and predator impact: spatial implications for prey conservation. Journal of Applied Ecology 38, 720–735.
| Crossref | GoogleScholarGoogle Scholar |
![](../../media/share/OpenURL_Image.gif)
Schrott, G. R. , With, K. A. , and King, A. W. (2005). Demographic limitations of the ability of habitat restoration to rescue declining populations. Conservation Biology 19, 1181–1193.
| Crossref | GoogleScholarGoogle Scholar |
![](../../media/share/OpenURL_Image.gif)
Scott, D. M. , Brown, D. , Mahood, S. , Denton, B. , Silburn, A. , and Rakotondraparany, F. (2006). The impacts of forest clearance on lizard, small mammal and bird communities in the arid spiny forest, southern Madagascar. Biological Conservation 127, 72–87.
| Crossref | GoogleScholarGoogle Scholar |
![](../../media/share/OpenURL_Image.gif)
Sutton, P. E. , Mushinsky, H. R. , and McCoy, E. D. (1999). Comparing the use of pitfall drift fences and cover boards for sampling the threatened sand skink (Neoseps reynoldsi). Herpetological Review 30, 149–151.
![](../../media/share/OpenURL_Image.gif)
Telford, S. R. (1959). A study of the sand skink, Neoseps reynoldsi Stejneger. Copeia 1959, 110–119.
| Crossref | GoogleScholarGoogle Scholar |
![](../../media/share/OpenURL_Image.gif)
Telford, S. R. (1962). New locality records for the sand skink (Neoseps reynoldsi) in central Florida, with comments on the habitat. Quarterly Journal of the Florida Academy of Sciences 25, 76–77.
![](../../media/share/OpenURL_Image.gif)
Webb, J. K. , Shine, R. , and Pringle, R. M. (2005). Canopy removal restores habitat quality for an endangered snake in a fire supressed landscape. Copeia 4, 893–899.
![](../../media/share/OpenURL_Image.gif)