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Status Assessment and Distribution Model for the Eastern Diamondback Rattlesnake (Crotalus Adamanteus) in Georgia

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Status Assessment and Distribution Model for the Eastern Diamondback Rattlesnake (Crotalus Adamanteus) in Georgia A Status Assessment and Distribution Model for the Eastern Diamondback Rattlesnake (Crotalus adamanteus) in Georgia Kevin M. Stohlgren, Stephen F. Spear, and Dirk J. Stevenson The Orianne Society 2015 Photo: © Pete Oxford Contents Executive Summary ........................................................................................................................................ Introduction ................................................................................................................................................... 1 Methods ........................................................................................................................................................ 1 Species Occurrence Data .......................................................................................................................... 2 Data Layers ............................................................................................................................................... 3 Land Cover ............................................................................................................................................ 3 Soils....................................................................................................................................................... 5 Canopy Cover ....................................................................................................................................... 7 Impervious Surface ............................................................................................................................... 8 Descriptive Statistics ................................................................................................................................. 9 Species Distribution Modeling.................................................................................................................. 9 Model Evaluation ...................................................................................................................................... 9 Results ........................................................................................................................................................... 9 Species Occurrence Data .......................................................................................................................... 9 Descriptive Statistics ................................................................................................................................. 9 Maxent Model ......................................................................................................................................... 10 Discussion ................................................................................................................................................... 18 Literature Cited ........................................................................................................................................... 20 Appendix 1: County Records for Crotalus adamanteus in Georgia ........................................................... 22 List of Figures Figure 1: Crotalus adamanteus records from 2000-2015 used to generate a MaxEnt habitat suitability model. ........................................................................................................................................................... 2 Figure 2: Georgia Land Use Trends (GLUT) land cover classifications (from 2008) for our study area. ... 4 Figure 3: Gridded Soil Survey Geographis (gSSURGO) Database percent sand (from 2014) for our study area. ............................................................................................................................................................... 5 Figure 4: Gridded Soil Survey Geographis (gSSURGO) Database percent clay (from 2014) for our study area. ............................................................................................................................................................... 6 Figure 5: Georgia Land Use Trends (GLUT) canopy cover (from 2008) for our study area. ...................... 7 Figure 6: Georgia Land Use Trends (GLUT) impervious surface (from 2008) for our study area.............. 8 Figure 7: Land cover associations for Crotalus adamanteus compared to the availability on the landscape (% of landscape). ........................................................................................................................................ 10 Figure 8: Receiver Operating Characteristic (ROC) plot and the associated Area Under the Curve (AUC) for our 10-fold cross-validation MaxEnt distribution model. ..................................................................... 11 Figure 9: 10-fold cross validation MaxEnt distribution model showing the distribution probability for Crotalus adamanteus in our study area. ...................................................................................................... 12 Figure 10: 10-fold cross-validation MaxEnt distribution model showing the distribution probability for Crotalus adamanteus in our study area reclassifed based on the maximum training sensitivity plus specificity threshold. ................................................................................................................................... 13 Figure 11: Jackknife analysis of regularized training gain for our 10-fold cross-validation MaxEnt distribution model for Crotalus adamanteus. ............................................................................................. 14 Figure 12: Response curve for Urban land cover in our 10-fold cross-validation MaxEnt model when only that variable was considered. .............................................................................................................. 15 Figure 13: Response curve for crop/pasture land cover in our 10-fold cross-validation MaxEnt model when only that variable was considered. .................................................................................................... 16 Figure 14: Response curve for the percent sand variable in our 10-fold cross-validation MaxEnt model when only that variable was considered ..................................................................................................... 17 List of Tables Table 1: Area and percentage of landscape in each of the four prediction classes of relative habitat suitability for Crotalus adamanteus in our study area. ...................................................................................................................... 13 Table 2: Variable contribution for our 10-fold cross-validation MaxEnt distribution model for Crotalus adamanteus. Percent contribution reflects the order in which variables were introduced to the model. Permutation importance reflects the importance of each variable when all permutations are considered. ......................................................... 17 Executive Summary Suspected population declines of the Eastern Diamondback Rattlesnake (Crotalus adamanteus) populations led to a petition to list the species under the Endangered Species Act, and the status of the species is currently being reviewed by the U.S. Fish and Wildlife Service. To help address this conservation issue, we collected recent (2000–2015) occurrence records for Georgia, and used these to develop a distribution model for the state. We compiled 381 C. adamanteus records for 2000–2015, using 299 of these points to develop a MaxEnt model. The C. adamanteus records that we compiled for 2000-2015 were widely distributed throughout the Coastal Plain, including records for 55 of the 64 counties from which the species has historically been documented. Our model corroborated this, predicting suitable habitat across most of the Coastal Plain. However, predicted suitable habitat was not extensive, indicating that while C. adamanteus populations may still be widespread in the state, apparently they are restricted to certain habitat conditions. Our results indicate that the southern third of Georgia remains a notable population stronghold for C. adamanteus, with significant, extant rattlesnake populations associated with the quail plantations located in the southcentral and southwestern part of the state, uplands within the Altamaha River Drainage, and the barrier islands and coastal strand regions. Our descriptive statistics and the jackknife analysis showed that C. adamanteus populations are associated with evergreen forest and avoid urban areas and deciduous forests. These results are consistent with habitat descriptions provided in the literature. Less than 14% of the Coastal Plain of Georgia was predicted to have a habitat suitability of 0.5-1.0, but almost 40% of that area occurs on properties that are currently under some level of protection. Conservation efforts for C. adamanteus should focus on increasing the amount of suitable habitat available and appropriately managing this habitat (e.g., prescribed fire) to maintain the open-canopied conditions preferred by the species. Introduction The Eastern Diamondback Rattlesnake (Crotalus adamanteus) is native to the Coastal Plain of the southeastern United States, ranging from eastern Louisiana to southeastern North Carolina, south through all of Florida (Martin and Means 2000). The species occupies open-canopied habitats such as longleaf pine (Pinus palustris) ecosystems, which are among the most imperiled habitats globally (Noss et al. 1995; Outcalt and Sheffield
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