Download or read book Improving the Image of the Eastern Massasauga Rattlesnake in the Midwest written by D. J. Case & Associates and published by . This book was released on 2002 with total page 102 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Using Human Dimensions Insights to Improve Conservation Efforts for the Eastern Massasauga Rattlesnake Sistrurus Catenatus Catenatus in Michigan and the Timber Rattlesnake Crotalus Horridus Horridus in Minnesota written by Rebecca Ann Christoffel and published by . This book was released on 2007 with total page 612 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Modeling Habitat Suitability and Population Demographics of the Eastern Massasauga Rattlesnake in Managed Lands in Southwestern Michigan written by Robyn Leah Bailey and published by . This book was released on 2010 with total page 280 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Status of the Eastern Massasauga Rattlesnake at Indiana Dunes National Lakeshore written by National Park Service and published by CreateSpace. This book was released on 2013-08-28 with total page 54 pages. Available in PDF, EPUB and Kindle. Book excerpt: The eastern massasauga rattlesnake (Sistrurus catenatus catenatus) is a candidate for federal listing as a threatened or endangered Distinct Population Segment (DPS) (U.S. FWS 2003). Although the massasauga rattlesnake is thought to be in decline throughout much of its range, only the eastern subspecies (Sistrurus c. catenatus) is currently under consideration for listing. The eastern subspecies has been described as historically ranging from central New York and southern Ontario, southwest to Iowa and Missouri (Johnson 1995; Minton 2001). This eastern subspecies encompasses all S. catenatus residing north and east of the Missouri River.
Download or read book Habitat Use and Movement Patterns of the Eastern Massasauga Rattlesnake in Wisconsin written by Christopher H. Danou and published by . This book was released on 1997 with total page 62 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Modeling Habitat Ecology and Population Viability of the Eastern Massasauga Rattlesnake in Southwestern Lower Michigan written by Kristin Marie Bissell and published by . This book was released on 2006 with total page 284 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Second International Symposium and Workshop on the Conservation of the Eastern Massasauga Rattlesnake Sistrurus Catenatus Catenatus written by Bob Johnson and published by Scarborough, Ont. : Toronto Zoo. This book was released on 1999 with total page 180 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Landscape Genetics Demographic Models and Conservation of the Eastern Massasauga Rattlesnake Sistrurus Catenatus written by Scott Anthony Martin and published by . This book was released on 2022 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Successful conservation actions require a detailed understanding of how individuals interact with their environment. For many threatened and endangered species, anthropogenic changes to their landscape have created barriers separating formerly connected populations. This isolation can have profound impacts on the long-term viability of these populations and ultimately the conservation status of the species. For example, as populations become more isolated, they may enter the “extinction vortex” where small populations experience high levels of inbreeding and genetic drift depressing demographic rates, driving the population into a positive feedback loop that can lead to a decline in numbers and eventual extinction. However, if barriers to movement are not complete, even infrequent dispersal between populations can counter potential vortex effects by bolstering local population sizes and introducing new genetic material. Determining if populations are connected via dispersal or if they are isolated is a difficult question with no single best approach. For the Federally threatened Eastern Massasauga Rattlesnakes, Sistrurus catenatus, their reclusive, sedentary lifestyle make many field-based methods for generating this information difficult and unreliable without unrealistic investments of time and resources. In my thesis, I used information from DNA single nucleotide polymorphisms (SNPs) from neutral genetic markers to address the following three fundamental questions regarding how S. catenatus move through their landscape in Ohio and how this information can be used to evaluate proposed activities for their conservation: (1) Do snakes in scattered habitat patches across Northeastern Ohio belong to a single connected population, a metapopulation with infrequent dispersal, or isolated populations? I used 1000s of DNA SNPs to reconstruct a pedigree across 86 individuals and showed that no individuals have moved between habitat patches separated by more than a few meters in the last three generations. This is despite known movements of over 2 km by individual snakes in other populations of this species found in more continuous habitat. From these results, I concluded that S. catenatus in NE Ohio is split into five genetically distinct populations in an area smaller than 15 km2 with no recent connectivity. (2) What landscape features drive the observed lack of connectivity? I next used the same SNP dataset with a second SNP dataset collected from 103 S. catenatus from a large population in Central Ohio to model landcover features that potentially impact resistance to movement between local habitat patches. I found that an inherent landscape feature, elevation, and contemporary landcover, specifically roads, were the main barriers to connectivity. I then used the resistance maps and pedigrees for S. catenatus populations in NE Ohio and Central Ohio to estimate the resistance values between all pairs of closely related individuals and used those to estimate dispersal kernels around each population. The kernels results reinforced our previous finding of no contemporary connectivity between S. catenatus populations in this region. (3) How would proposed management actions impact the demographic viability of S. catenatus in NE Ohio? The habitat occupied by populations of S. catenatus in NE Ohio has been targets of active management to prevent vegetation succession, and there has been increased interest in additional habitat management. Suggested management actions for individual S. catenatus populations have focused on increasing habitat sizes, increasing the frequency of woody vegetation removal, creating habitat between populations, and translocating snakes between populations. I built forward-in-time simulations of population trends under current management and five alternative management activities using resistance maps that I previously developed in Population Viability Analysis (PVA) models. I found that connectivity improvements via the formation of new habitats (and ideally new populations) between the current populations or a hybrid connectivity/translocation strategy offered the greatest improvement towards both overall population size and the number of occupied patches. These connectivity models were superior to the base scenario representing no changes to management. Overall, my research has generated novel tools and approaches based on landscape genetics and demographic modeling for conservation of endangered and threatened species in fragmented landscapes. When applied to S. catenatus population is in NE Ohio, these approaches have provided new and significant insights on contemporary population structure in S. catenatus in NE Ohio, how the landscape created the observed patterns, and how this information can be used to generate management recommendations to promote the long-term persistence of this threatened reptile.
Download or read book Filling in the Gaps in Demography Phenology and Life History of the Eastern Massasauga Rattlesnake Sistrurus Catenatus written by Eric T. Hileman and published by . This book was released on 2016 with total page 147 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Eastern Massasauga (Sistrurus catenatus) is a small, cryptic North American rattlesnake with a distribution centered on the Great Lakes. It is listed as threatened and endangered in Canada. In the United States, ongoing population declines due to habitat loss, habitat fragmentation, and harvest led to the species being listed as threatened under the U.S. Endangered Species Act in 2016. Estimates of population parameters are essential for modeling population dynamics, assessing population viability, and elucidating the effects of land management practices on population persistence. However, conservation of Eastern Massasauga populations has been hampered by information gaps related to life history and hibernation phenology. In addition, key demographic parameter estimates are lacking for populations near the range center of the species where the largest number of Eastern Massasauga populations may still persist. Consequently, biologically realistic population viability analyses and management guidelines related to the timing of habitat management activities have been difficult to develop. In this study, I address these data gaps by providing 1) a range-wide synthesis to evaluate geographic variation in life history traits, 2) critically needed demographic estimates, population viability analysis, and prescribed burn simulations from a centrally located population, and 3) a predictive hibernation ingress/egress model to assist managers in minimizing mortality during ground-disturbing land management activities. To address life history data gaps, I compiled data from 47 study sites representing 38 counties across the range. I used multimodel inference and general linear models with geographic coordinates and annual climate normals as explanatory variables to clarify patterns of variation in life history traits. I found strong evidence for geographic variation in six of nine life history variables. Adult female snout-vent length and neonate mass increased with increasing mean annual precipitation. Litter size decreased with increasing mean temperature, and the size--fecundity relationship and age zero growth both increased with increasing latitude. The proportion of gravid females also increased with increasing latitude, but this relationship may be the result of geographically varying detection bias. Next, I used eight years of data and contemporary capture-recapture and matrix model methods to estimate population parameters for an Eastern Massasauga population near the range center of the species in Cass County, Michigan. From 2009--2016, 826 Eastern Massasaugas were captured 1,776 times. On average, sexual maturity occurred at age three in both sexes. Mean litter size was 7.6. Annual survival increased with increasing age (age zero=0.38, age 1=0.65, age 2=0.76, age ≥3 females=0.71), but declined slightly in age ≥3 males (0.66). Abundance estimates ranged from 84--140 adults and annual reproductive frequency was 0.44. Using these estimates, I developed a baseline population projection model to evaluate population persistence in Cass County and the degree to which increased mortality during spring, fall, and late fall prescribed burns might affect population growth 50 and 100 years into the future if current conditions persist. The baseline model, which incorporated current prescribed fire practices, indicated a stable population with only a 1% probability of extinction over 100 years, suggesting that management practices at this site are sustainable if they remain unchanged. Simulations of conservative increases in mortality due to fire changed the probability of extinction little over 50 years (0.000--0.003), but increased probability of extinction up to 14% over 100 years in the most pessimistic prescribed burn scenario. Last, I installed on-site weather stations at seven Eastern Massasauga study sites in Iowa, Illinois, Ohio (2 sites), and Michigan (3 sites). I identified dates of spring emergence using a combination of intensive visual searches, radio telemetry, and camera traps. I used observation data and soil temperature data from logging stations to validate a predictive egress phenology model and clarify geographic patterns of variation in the timing of Eastern Massasauga emergence. Emergence from hibernation was clearly associated with a reversal in soil temperature gradients although there were sometimes multiple reversals with hibernation egress lagging the first reversal by a week or more. Based on these patterns, I provide recommendations that minimize the risk for Eastern Massasauga mortality and avoid unnecessary curtailment of the burn season. This model has the potential to predict when prescribed fire or ground-disturbing management activities are least likely to cause direct snake mortality.
Download or read book Eastern Massasauga Rattlesnake Population and Habitat Ecology in Southern Michigan written by Stephanie Anne Shaffer and published by . This book was released on 2018 with total page 190 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book International Symposium and Workshop on the Conservation of the Eastern Massasauga Rattlesnake Sistrurus Catenatus Catenatus written by Bob Johnson and published by West Hill, Ont. : Metropolitan Toronto Zoo. This book was released on 1993 with total page 141 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Eastern Massasauga Rattlesnake written by Andrew S. Hoffman and published by . This book was released on 2023 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Eastern Massasauga Rattlesnake (Sistrurus catenatus; EMR) has declined through most of its range and is endangered in Ohio and federally threatened. Areas that EMR may inhabit must be surveyed prior to approving development projects. Therefore, comprehensive, fast, and affordable survey techniques for the EMR are of interest to government and non-government groups. This is particularly evident in Ohio where all known EMR populations are near maintained or expanding road networks. Traditional EMR surveying in Ohio uses visual encounter surveys and artificial cover object arrays. The purpose of this research is to test and refine a new survey technique, the Adapted-Hunt Drift Fence Technique (AHDriFT) and compare it to current EMR survey methods using a cost-benefit analysis. We deployed AHDriFT arrays at 66 fields across seven Ohio Counties over the course of four years, yielding 351 EMR detections at 57 fields. AHDriFT was the most effective and consistent method for detecting massasaugas in Ohio across a broad range of environmental and temporal variables. In this report, we generated relatively precise estimates for deploying these arrays to achieve high confidence in survey results.
Download or read book Responses of the Eastern Massasauga Rattlesnake Sistrurus Catenatus Catenatus to Prescribed Fire in Southwestern Michigan Wetland Prairies written by Matthew David Cross and published by . This book was released on 2009 with total page 82 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Reproductive Ecology of the Eastern Massasauga Rattlesnake Sistrurus C Catenatus at Carlyle Lake Illinois written by Benjamin Christopher Jellen and published by . This book was released on 2005 with total page 110 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Eastern Massasauga Rattlesnake Stewardship Guide written by Eastern Massasauga Rattlesnake Recovery Team and published by . This book was released on 2000 with total page 84 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Estimating Abundance for a Declining Population of Eastern Massasauga Rattlesnake Sistrurus Catenatus Catenatus in Cicero NY written by Alex T. Krofta and published by . This book was released on 2007 with total page 46 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Eastern Massasauga Rattlesnake written by Ontario. Ministry of Natural Resources and published by . This book was released on 1983 with total page 1 pages. Available in PDF, EPUB and Kindle. Book excerpt:
