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Observations of Male Combat in Alligator Snapping Turtles in Florida and Georgia 佛罗里达和乔治亚州鳄鳄龟雄性战斗的观察
IF 0.6 4区 环境科学与生态学
Southeastern Naturalist Pub Date : 2023-06-14 DOI: 10.1656/058.022.0sp1223
Kevin M. Enge, Travis M. Thomas, Greg Brashear, J. Willmott
{"title":"Observations of Male Combat in Alligator Snapping Turtles in Florida and Georgia","authors":"Kevin M. Enge, Travis M. Thomas, Greg Brashear, J. Willmott","doi":"10.1656/058.022.0sp1223","DOIUrl":"https://doi.org/10.1656/058.022.0sp1223","url":null,"abstract":"Abstract - Combat has been described in captive but not in wild Macrochelys temminckii (Alligator Snapping Turtle). Combat may be seldom observed in the wild because of the habitats used by these highly aquatic, cryptic turtles. We report 1 observation of fighting in M. temminckii and 3 observations of fighting in M. suwanniensis (Suwannee Alligator Snapping Turtle) from Florida and Georgia. Combat involved wrestling and biting of heads and front feet, and it was usually accompanied by dramatic bubbling of the water surface from submerged turtles. Observations were made in September, October, and December, outside of the presumed courtship and mating season.","PeriodicalId":49490,"journal":{"name":"Southeastern Naturalist","volume":"54 1","pages":"388 - 392"},"PeriodicalIF":0.6,"publicationDate":"2023-06-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82886155","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
A Standardized Field Method and Habitat Suitability Model to Assess Reintroduction Sites for Alligator Snapping Turtles 评估鳄鳄龟放归地点的标准化野外方法和生境适宜性模型
IF 0.6 4区 环境科学与生态学
Southeastern Naturalist Pub Date : 2023-06-14 DOI: 10.1656/058.022.0sp1203
Kameron C. Voves, S. L. Hannabass, Denise M. Thompson, D. B. Ligon
{"title":"A Standardized Field Method and Habitat Suitability Model to Assess Reintroduction Sites for Alligator Snapping Turtles","authors":"Kameron C. Voves, S. L. Hannabass, Denise M. Thompson, D. B. Ligon","doi":"10.1656/058.022.0sp1203","DOIUrl":"https://doi.org/10.1656/058.022.0sp1203","url":null,"abstract":"Abstract - Head-start programs have been established to aid in the recovery of Macrochelys temmincki (Alligator Snapping Turtle) throughout the Mississippi River drainage. As the success of the breeding programs increase, additional release sites are needed where suitable habitat persists for reintroduction of Alligator Snapping Turtles, but methods to evaluate habitat suitability remain loosely defined. We developed a standardized field survey and habitat suitability model that can be used to assess and prioritize potential reintroduction sites. We measured important habitat features in the field and indexed them using a simple model that translated continuous data to an ordinal scoring system, resulting in an overall site-suitability score. We developed the model using 2 potential measurements of submerged deadwood density and determined habitat suitability among 17 sites in Kansas, Oklahoma, and Mississippi where Alligator Snapping Turtles were absent, present, and reintroduced. The model using side-scan sonar correctly predicted the presence of good habitat at sites where wild and reintroduced populations of Alligator Snapping Turtles were present, and scores were significantly related to Alligator Snapping Turtle abundance.","PeriodicalId":49490,"journal":{"name":"Southeastern Naturalist","volume":"336 1","pages":"56 - 77"},"PeriodicalIF":0.6,"publicationDate":"2023-06-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80645891","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Distribution Patterns and Factors Influencing Relative Abundance of the Alligator Snapping Turtle (Macrochelys temminckii) in Mississippi 密西西比州鳄鳄龟分布格局及相对丰度影响因素
IF 0.6 4区 环境科学与生态学
Southeastern Naturalist Pub Date : 2023-06-14 DOI: 10.1656/058.022.0sp1209
Luke Pearson, Lucas Haralson, Gabrielle Berry, Grover J. Brown, C. Qualls
{"title":"Distribution Patterns and Factors Influencing Relative Abundance of the Alligator Snapping Turtle (Macrochelys temminckii) in Mississippi","authors":"Luke Pearson, Lucas Haralson, Gabrielle Berry, Grover J. Brown, C. Qualls","doi":"10.1656/058.022.0sp1209","DOIUrl":"https://doi.org/10.1656/058.022.0sp1209","url":null,"abstract":"Abstract - Macrochelys temminckii (Alligator Snapping Turtle) was recently proposed as a threatened species under the US Endangered Species Act due to current and projected future declining populations range wide. Despite a presumed statewide distribution in Mississippi, the Alligator Snapping Turtle had been documented in only 32 of 82 counties between 1857 and 2012, thus leaving a substantial gap in our knowledge of this species' distribution. Therefore, we collected credible records from museums, literature, and the general public, as well as directly assessed the current distribution and relative abundance of the Alligator Snapping Turtle in all major river systems (i.e., Pascagoula, Pearl, Tombigbee, and Mississippi river drainages) in Mississippi. From 2017 to 2021, we systematically trapped 77 sites across the state totaling 839 captures of 787 individual Alligator Snapping Turtles over the course of 4750 trap nights. State-wide catch per unit effort (CPUE) averaged 0.177, with the Big Black River (0.348) and Tombigbee River (0.028) drainages having the highest and lowest average CPUE, respectively. In Mississippi, CPUE was positively correlated with greater surrounding wetland area and river size, and negatively correlated with terrain ruggedness. This survey, along with the collaboration of other biologists and the public, verified an additional 189 locality records in 56 counties, with Alligator Snapping Turtle presence reconfirmed at 29 of 30 historical localities. Currently, it appears that there have been no local extirpations of the species in Mississippi, and state-wide CPUE was higher than those of the surrounding states.","PeriodicalId":49490,"journal":{"name":"Southeastern Naturalist","volume":"51 1","pages":"138 - 156"},"PeriodicalIF":0.6,"publicationDate":"2023-06-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75148436","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Maximum Body Size of the Suwannee Alligator Snapping Turtle (Macrochelys suwanniensis) 苏万尼鳄鳄龟的最大体型
IF 0.6 4区 环境科学与生态学
Southeastern Naturalist Pub Date : 2023-06-14 DOI: 10.1656/058.022.0sp1226
Gerald R. Johnston, Jeremy S. Geiger, Travis M. Thomas, Kevin M. Enge, E. Suarez, Bryant Davis
{"title":"Maximum Body Size of the Suwannee Alligator Snapping Turtle (Macrochelys suwanniensis)","authors":"Gerald R. Johnston, Jeremy S. Geiger, Travis M. Thomas, Kevin M. Enge, E. Suarez, Bryant Davis","doi":"10.1656/058.022.0sp1226","DOIUrl":"https://doi.org/10.1656/058.022.0sp1226","url":null,"abstract":"Abstract - The published literature does not provide a consensus regarding maximum body sizes of North America's largest wild freshwater turtles (genus Macrochelys). The largest known wild M. suwanniensis (Suwannee Alligator Snapping Turtle) currently exists as a curated specimen measuring 713 mm straight-midline carapace length, 801 mm maximum carapace length, 619 mm maximum carapace width, and 236 mm maximum head width. The turtle was never weighed, but we used morphometric data from our studies in the Santa Fe and Suwannee rivers to estimate that it weighed ∼76.4 kg (168 lbs) when captured. Our 95% prediction interval (67.6–86.3 kg [149–190 lbs]) suggests that speculative estimates and anecdotal reports of M. suwanniensis that weigh ≥90 kg (≥200 lbs) are dubious.","PeriodicalId":49490,"journal":{"name":"Southeastern Naturalist","volume":"1 1","pages":"418 - 428"},"PeriodicalIF":0.6,"publicationDate":"2023-06-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76719025","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
Determining Sexual Size Dimorphism in an Alligator Snapping Turtle (Macrochelys temminckii) Population in Southwest Georgia: Use of Morphometrics, Ultrasonography, and Testosterone 乔治亚州西南部鳄鱼鳄龟(Macrochelys temminckii)种群性别大小二态性的测定:形态测量学、超声检查和睾丸激素的使用
IF 0.6 4区 环境科学与生态学
Southeastern Naturalist Pub Date : 2023-06-14 DOI: 10.1656/058.022.0sp1215
D. Rostal, Amber Teare, Philip Marley, J. Jensen
{"title":"Determining Sexual Size Dimorphism in an Alligator Snapping Turtle (Macrochelys temminckii) Population in Southwest Georgia: Use of Morphometrics, Ultrasonography, and Testosterone","authors":"D. Rostal, Amber Teare, Philip Marley, J. Jensen","doi":"10.1656/058.022.0sp1215","DOIUrl":"https://doi.org/10.1656/058.022.0sp1215","url":null,"abstract":"Abstract - We studied the determination of sex for intermediate size classes and adult sexual dimorphism in a Georgia population of Macrochelys temminckii (Alligator Snapping Turtle). We sexed turtles when possible based on size and morphometrics. We took blood samples from captured individuals and measured plasma testosterone using enzyme-linked immunoassay. We examined females and individuals for which sex was unknown using ultrasound to determine sex and reproductive status. We used testosterone concentration to confirm individual sex assignments. For all biometric measurements, adult males were larger than females. Testosterone concentrations were higher in adult and subadult males than in females. Head width did not differ between the sexes when adjusted for body size. Plastron-to-vent length (cm) and testosterone concentrations were significantly greater in adult and subadult male turtles compared to females and were valuable in determining sex of smaller adults >25 cm straight-midline carapace length.","PeriodicalId":49490,"journal":{"name":"Southeastern Naturalist","volume":"50 1","pages":"250 - 263"},"PeriodicalIF":0.6,"publicationDate":"2023-06-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84203486","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
Biology and Conservation of Alligator Snapping Turtles (Macrochelys)Dedication 鳄鳄龟的生物学与保护
IF 0.6 4区 环境科学与生态学
Southeastern Naturalist Pub Date : 2023-06-14 DOI: 10.1656/058.022.0sp12i
J. L. Carr, E. Kessler, Gerald R. Johnston
{"title":"Biology and Conservation of Alligator Snapping Turtles (Macrochelys)Dedication","authors":"J. L. Carr, E. Kessler, Gerald R. Johnston","doi":"10.1656/058.022.0sp12i","DOIUrl":"https://doi.org/10.1656/058.022.0sp12i","url":null,"abstract":"","PeriodicalId":49490,"journal":{"name":"Southeastern Naturalist","volume":"49 1","pages":"i - i"},"PeriodicalIF":0.6,"publicationDate":"2023-06-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81948275","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Anthropogenic Threats to Alligator Snapping Turtles (Chelydridae: Macrochelys) 鳄鳄龟的人为威胁(鳄鳄科:鳄鳄龟)
IF 0.6 4区 环境科学与生态学
Southeastern Naturalist Pub Date : 2023-06-14 DOI: 10.1656/058.022.0sp1202
Amy K. Shook, Charles D. Battaglia, Kevin M. Enge, Carlyle Franklin, J. Godwin, A. C. Johnson, E. Kessler, Eric C. Munscher, Kelly Norrid, Luke Pearson, Viviana Ricardez, Dirk J. Stevenson, Travis M. Thomas, J. L. Carr
{"title":"Anthropogenic Threats to Alligator Snapping Turtles (Chelydridae: Macrochelys)","authors":"Amy K. Shook, Charles D. Battaglia, Kevin M. Enge, Carlyle Franklin, J. Godwin, A. C. Johnson, E. Kessler, Eric C. Munscher, Kelly Norrid, Luke Pearson, Viviana Ricardez, Dirk J. Stevenson, Travis M. Thomas, J. L. Carr","doi":"10.1656/058.022.0sp1202","DOIUrl":"https://doi.org/10.1656/058.022.0sp1202","url":null,"abstract":"Abstract - With the conservation status of Macrochelys (alligator snapping turtles) being examined at the national level, our objective was to compile categorical data on threats from anthropogenic interactions. We included information from (1) author-collected anecdotes on human–turtle interactions and (2) radiographs to assess the prevalence of ingested fishing hooks. We placed 173 interactions involving 192 incidents into 9 IUCN threat categories and found bycatch involving fish hooks to be 4 times more numerous than the second-most numerous threat, turtle persecution. Fishing bycatch resulted in a high proportion of turtle mortalities (39%), and bycatch incidents in several cases preceded the highest-mortality threat (53%), persecution of individuals involving shooting or blunt trauma. We recommend fishing bycatch-mitigation measures and educational efforts to help conserve Macrochelys.","PeriodicalId":49490,"journal":{"name":"Southeastern Naturalist","volume":"24 1","pages":"25 - 55"},"PeriodicalIF":0.6,"publicationDate":"2023-06-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84795286","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 3
Status and Distribution of Alligator Snapping Turtles (Macrochelys temminckii) in Northern Louisiana 美国路易斯安那州北部鳄鳄龟的现状和分布
IF 0.6 4区 环境科学与生态学
Southeastern Naturalist Pub Date : 2023-06-14 DOI: 10.1656/058.022.0sp1210
A. C. Johnson, Amy K. Shook, J. L. Carr, Neil H. Douglas
{"title":"Status and Distribution of Alligator Snapping Turtles (Macrochelys temminckii) in Northern Louisiana","authors":"A. C. Johnson, Amy K. Shook, J. L. Carr, Neil H. Douglas","doi":"10.1656/058.022.0sp1210","DOIUrl":"https://doi.org/10.1656/058.022.0sp1210","url":null,"abstract":"Abstract - The Alligator Snapping Turtle (Macrochelys temminckii) is a species of conservation concern across its range due to past commercial harvest for consumption. Northern Louisiana was originally surveyed in the 1980s, but the survey data were not compiled and published. After almost 40 years, we resurveyed the region to validate the historic data as well as provide current data on the distribution of Alligator Snapping Turtles. From the 1980s, we provide demographic data for 300 Alligator Snapping Turtles collected from 17 Louisiana parishes. From 2018–2020, we captured and measured 62 Alligator Snapping Turtles from 19 trapping sites. We recommend continued surveying and monitoring efforts in Louisiana to track populations during the post-commercial–harvest period.","PeriodicalId":49490,"journal":{"name":"Southeastern Naturalist","volume":"21 1","pages":"157 - 170"},"PeriodicalIF":0.6,"publicationDate":"2023-06-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91273469","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
Diurnal Observations of Alligator Snapping Turtles (Macrochelys temminckii) 鳄鳄龟(Macrochelys temminckii)的日观测
IF 0.6 4区 环境科学与生态学
Southeastern Naturalist Pub Date : 2023-06-14 DOI: 10.1656/058.022.0sp1225
Carlyle Franklin, Viviana Ricardez, Sal Scibetta, David Rosenbaum, Ben Grizzle
{"title":"Diurnal Observations of Alligator Snapping Turtles (Macrochelys temminckii)","authors":"Carlyle Franklin, Viviana Ricardez, Sal Scibetta, David Rosenbaum, Ben Grizzle","doi":"10.1656/058.022.0sp1225","DOIUrl":"https://doi.org/10.1656/058.022.0sp1225","url":null,"abstract":"Abstract - Macrochelys temminckii (Alligator Snapping Turtle) is a shy, well-camouflaged species that often inhabits turbid water. These factors, as well as the success of baited hoop traps in attracting the species at night, have created the perception that the species is predominantly nocturnal and does not bask. However, a growing body of evidence suggests that the species is also diurnally active and does bask. The use of binoculars and high-range cameras combined with extensive time in the field allowed us to document 25 instances of diurnal activity including behaviors such as basking, protrusion of the head above water, swimming, and foraging (i.e., entering baited traps). Our observations contribute to increasing evidence that both adults and juveniles exhibit basking and other diurnal behaviors.","PeriodicalId":49490,"journal":{"name":"Southeastern Naturalist","volume":"1 1","pages":"410 - 417"},"PeriodicalIF":0.6,"publicationDate":"2023-06-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90270226","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Population Structure and Genetic Differentiation in Extant Alligator Snapping Turtles (genus Macrochelys) with Implications for Taxonomy and Conservation 现存鳄鳄龟(Macrochelys属)的种群结构和遗传分化及其分类和保护意义
IF 0.6 4区 环境科学与生态学
Southeastern Naturalist Pub Date : 2023-06-14 DOI: 10.1656/058.022.0sp1201
J. J. Apodaca, Alexander R. Krohn, Louisa Collins, J. Godwin, Luke Pearson, A. Walde
{"title":"Population Structure and Genetic Differentiation in Extant Alligator Snapping Turtles (genus Macrochelys) with Implications for Taxonomy and Conservation","authors":"J. J. Apodaca, Alexander R. Krohn, Louisa Collins, J. Godwin, Luke Pearson, A. Walde","doi":"10.1656/058.022.0sp1201","DOIUrl":"https://doi.org/10.1656/058.022.0sp1201","url":null,"abstract":"Abstract - Historically believed to harbor unrecognized diversity, the taxonomy of the declining genus Macrochelys (alligator snapping turtles) is debated. The original species, M. temminckii, was recently split into M. temminckii, M. apalachicolae, and M. suwanniensis. However, the status of M. apalachicolae is contested. In this study, we generated thousands of genome-wide loci to quantify population structure and genetic differentiation across the range of Macrochelys spp. Our data indicate that M. apalachicolae is genetically distinct, with little gene flow between M. apalachicolae and other species, thus adding evidence that M. apalachicolae may be a distinct species. We also find genetic variation partitioned among river drainages, with very high intra- and interspecific genetic divergence among river drainages. We suggest that translocations and re-introductions only move turtles in this genus within their natal river drainages to preserve existing patterns of genetic diversity.","PeriodicalId":49490,"journal":{"name":"Southeastern Naturalist","volume":"1 1","pages":"1 - 24"},"PeriodicalIF":0.6,"publicationDate":"2023-06-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"72994595","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 4
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