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New Location Records for Alligator Snapping Turtle (Macrochelys temminckii) Captured during Fishery Surveys in Alabama 阿拉巴马州渔业调查期间捕获的鳄鳄鳄龟(Macrochelys temminckii)的新位置记录
IF 0.6 4区 环境科学与生态学 Q4 BIODIVERSITY CONSERVATION Pub Date : 2023-06-14 DOI: 10.1656/058.022.0sp1206
S. Rider, T. R. Powell, Gregory T. Miles
Abstract - Macrochelys temminckii (Alligator Snapping Turtle) is classified as a species of moderate conservation concern by the State of Alabama and is proposed for listing as threatened under the Endangered Species Act by the US Fish and Wildlife Service. Using the most up-to-date and best available distribution and biological data is paramount in the decision-making process for any petitioned or proposed-listed species. We provide an additional 21 Alligator Snapping Turtle records from Alabama collected as bycatch during fishery surveys. We incidentally captured 19 Alligator Snapping Turtles from the Alabama (n = 12), Tombigbee (n = 6), and Conecuh (n = 1) rivers and observed 2 additional specimens from the Tallapoosa River drainage. For both the Alabama and Tombigbee rivers combined, 89% of our Alligator Snapping Turtle captures were in backwater areas (i.e., off channel), which are new location records in these river drainages. Researchers and managers should consider contacting and collaborating with colleagues across scientific disciplines to compile and provide the best available data for current species assessments.
摘要:美国阿拉巴马州将鳄龟列为中等保护物种,美国鱼类和野生动物管理局建议将其列为濒危物种。在任何申请或建议列入名单的物种的决策过程中,使用最新和最好的分布和生物数据是至关重要的。我们在渔业调查期间提供了另外21条来自阿拉巴马州的鳄鱼鳄龟记录。我们偶然捕获了19只鳄鱼鳄龟,分别来自阿拉巴马河(n = 12)、Tombigbee河(n = 6)和Conecuh河(n = 1),并在塔拉波萨河流域观察了2只鳄鱼鳄龟。阿拉巴马河和汤比格比河加起来,89%的鳄龟是在回水地区捕获的,这是这些河流流域的新记录。研究人员和管理人员应该考虑与不同学科的同事联系和合作,以汇编和提供当前物种评估的最佳可用数据。
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引用次数: 1
Distribution and Demography of the Alligator Snapping Turtle (Macrochelys temminckii) in Texas: A 20-Year Perspective 德克萨斯州鳄龟的分布和人口统计:20年的观察
IF 0.6 4区 环境科学与生态学 Q4 BIODIVERSITY CONSERVATION Pub Date : 2023-06-14 DOI: 10.1656/058.022.0sp1212
David Rosenbaum, D. Rudolph, Daniel Sáenz, L. Fitzgerald, R. Nelson, Christopher S. Collins, Toby J. Hibbitts, Ricky W. Maxey, Paul S Crump, C. Schalk
Abstract - Texas contains the southwestern range edge of Macrochelys temminckii (Alligator Snapping Turtle), but there is relatively little published information on this species within the state. To document its range and assess temporal changes in its distribution and demography, we sampled 23 sites from 1999 to 2001. We then resurveyed 22 of these sites and sampled 29 additional sites in 2020–2021. Detection outcomes were consistent between 18 of the 22 resurveyed sites. Sex ratios and body-size distributions were similar across surveys. Catch per unit effort (CPUE) was lower in areas with trotlines, corroborating known interactions between turtles and fishing gear. Patterns in CPUE indicate Gulf of Mexico-draining watersheds are important systems for the species, while CPUE was lower in Mississippi-draining watersheds.
摘要:美国德克萨斯州包含了鳄鳄鳄龟(Macrochelys temminckii)的西南范围边缘,但该州关于该物种的出版信息相对较少。为了记录其分布范围并评估其分布和人口统计的时间变化,我们在1999年至2001年期间对23个地点进行了采样。然后,我们在2020-2021年对其中的22个地点进行了重新调查,并对另外29个地点进行了采样。在22个重新调查的地点中,18个的检测结果是一致的。性别比例和体型分布在调查中是相似的。在有拖带线的地区,单位努力渔获量(CPUE)较低,证实了海龟和渔具之间已知的相互作用。CPUE的变化模式表明墨西哥湾流域是该物种的重要系统,而密西西比流域的CPUE则较低。
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引用次数: 6
Biology and Conservation of Alligator Snapping Turtles (Macrochelys): General Acknowledgments 短吻鳄鳄龟(Macrochelys)的生物学和保护:一般致谢
IF 0.6 4区 环境科学与生态学 Q4 BIODIVERSITY CONSERVATION Pub Date : 2023-06-14 DOI: 10.1656/058.022.0sp12ii
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引用次数: 0
Nest Success of Alligator Snapping Turtles (Macrochelys temminckii) in Louisiana, with Comments on Sources of Mortality 路易斯安那州鳄鳄龟(Macrochelys temminckii)的成功筑巢,以及对死亡来源的评论
IF 0.6 4区 环境科学与生态学 Q4 BIODIVERSITY CONSERVATION Pub Date : 2023-06-14 DOI: 10.1656/058.022.0sp1218
Samuel Holcomb, J. L. Carr
Abstract - We report nest success for 16 Alligator Snapping Turtle nests oviposited at Black Bayou Lake National Wildlife Refuge in 2008 and 2009. We split each clutch into 2 portions for field and laboratory incubation. The field portion was protected from mammalian depredation. For each nest, we report both pipping and hatching success. Our total observed levels of pipping and hatching success were 55.9% and 47.7%, respectively. We obtained a hatching success rate of 85.8% in the lab. Reasons for the difference in hatching success between the field and lab included both abiotic and biotic factors in the nest environment, such as flooding, temperature, and invertebrate predators.
摘要-我们报告了2008年和2009年在黑河口国家野生动物保护区产卵的16个鳄龟巢的成功产卵情况。我们将每个离合器分成2部分用于现场和实验室孵育。野外部分受到保护,不受哺乳动物的掠夺。对于每一个巢,我们都报告了打桩和孵化的成功。总成功率为55.9%,总孵化成功率为47.7%。在实验室的孵化成功率为85.8%。野外和实验室孵化成功率差异的原因包括巢环境中的非生物和生物因素,如洪水、温度和无脊椎动物捕食者。
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引用次数: 1
Nesting Emergences and Other Terrestrial Movements of Macrochelys (Testudines: Chelydridae) 大螯虾的筑巢出现和其他陆地运动(螯虾目:螯虾科)
IF 0.6 4区 环境科学与生态学 Q4 BIODIVERSITY CONSERVATION Pub Date : 2023-06-14 DOI: 10.1656/058.022.0sp1222
J. L. Carr, Jen Terry, D. B. Ligon, Kevin M. Enge, Caleb J. Krueger, Travis M. Thomas, Greg Brashear, Gerald R. Johnston, Mandi Gordon, Gina Lloyd, E. P. Hill, Dirk J. Stevenson, D. A. Steen
Abstract - Alligator snapping turtles (genus Macrochelys) are the largest freshwater turtles in North America. Despite strong interest in their conservation, we still lack a comprehensive understanding of their natural history, including behaviors associated with terrestrial activity. We reviewed the literature and solicited unpublished observations of terrestrial movements of these highly aquatic turtles. We compiled 206 observations of terrestrial activity from 9 states. The majority of observations were associated with nesting behavior. Observations expanded our knowledge regarding the spatial extent and timing of terrestrial movements and the nesting season. In addition, we compiled observations of terrestrially foraging animals, as well as males and juveniles traveling overland and crossing roads. Collectively, this information clarifies the extent of terrestrial movement by Macrochelys, behaviors that should be considered in conservation plans.
鳄鳄龟(Macrochelys属)是北美洲最大的淡水龟。尽管人们对它们的保护有着浓厚的兴趣,但我们对它们的自然历史,包括与陆地活动相关的行为,仍然缺乏全面的了解。我们回顾了文献,并征求了未发表的关于这些高度水生海龟陆地运动的观察结果。我们收集了来自9个州的206份陆地活动观测资料。大多数观察结果都与筑巢行为有关。观察扩大了我们对陆地活动的空间范围和时间以及筑巢季节的认识。此外,我们还收集了陆地觅食动物的观察结果,以及在陆地上旅行和穿越道路的雄性和幼年动物。总的来说,这些信息阐明了Macrochelys在陆地上移动的程度,这些行为应该在保护计划中加以考虑。
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引用次数: 1
Dietary Niche of Three Omnivorous Turtle Species in a Northern Florida River: Insights from Stable Isotope Analysis 北佛罗里达河中三种杂食性龟的饮食生态位:来自稳定同位素分析的见解
IF 0.6 4区 环境科学与生态学 Q4 BIODIVERSITY CONSERVATION Pub Date : 2023-06-14 DOI: 10.1656/058.022.0sp1221
Mathew J. Denton, Gerald R. Johnston, Travis M. Thomas, J. H. Waddle, Susan C. Walls, Kristen M. Hart
Abstract - Macrochelys suwanniensis (Suwannee Alligator Snapping Turtle) coexists with 2 other native large omnivorous turtle species (Chelydra serpentina [Snapping Turtle] and Trachemys scripta scripta [Yellow-bellied Slider]) in a 9-km section of the Santa Fe River in northern Florida. A major shift in dominant submersed aquatic vegetation prompted us to quantify trophic position and niche overlap among these 3 species. Here, we examine carbon and nitrogen isotopic values of these turtles and their potential food resources within the changing riverine system. We provide evidence of low isotopic niche overlap between M. suwanniensis and C. serpentina, whereas T. s. scripta occupied a discrete niche having lower carbon and nitrogen values.
摘要/ Abstract摘要:在佛罗里达州北部圣菲河9公里的河段内,Macrochelys suwanniensis (Suwannee短吻鳄鳄龟)与另外两种本土大型杂食性龟(Chelydra serpentina[鳄龟]和Trachemys scripta scripta[黄腹滑龟])共存。由于优势水生植被的重大变化,我们对这3个物种的营养位置和生态位重叠进行了量化。在这里,我们研究了这些海龟的碳和氮同位素值及其在不断变化的河流系统中的潜在食物资源。我们提供的证据表明,苏万尼石竹和蛇形石竹之间存在低同位素生态位重叠,而scripta则占据了一个碳氮值较低的离散生态位。
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引用次数: 1
Nesting Ecology of the Alligator Snapping Turtle (Macrochelys temminckii) along the Lower Apalachicola River, Florida 佛罗里达州下阿巴拉契科拉河沿岸鳄龟的筑巢生态
IF 0.6 4区 环境科学与生态学 Q4 BIODIVERSITY CONSERVATION Pub Date : 2023-06-14 DOI: 10.1656/058.022.0sp1219
D. R. Jackson, M. Ewert
Abstract - We studied nesting ecology and sex determination in a population of Macrochelys temminckii (Alligator Snapping Turtle) inhabiting the lower Apalachicola River in western Florida. During 1990–1991, we located 105 nests (63 intact, 42 depredated); 83% occurred on prominent dredged spoil substrates. Coupled with data from additional years, mean clutch size of 130 nests was 35.1 (min–max = 17–52). Most nesting occurred from 20 April to 18 May, with about a week annual variation. Hatching extended throughout August. In nests that we protected from predators, hatching success averaged 78% (24 nests) in 1990 and 66% (26 nests) in 1991. Overall sex ratios were roughly 1 male: 2 females, although individual nests varied from all males to all females in conjunction with solar exposure.
摘要/ Abstract摘要:本文研究了栖息在美国佛罗里达州西部阿巴拉契科拉河下游的美洲鳄鳄龟(Macrochelys temminckii)的筑巢生态和性别决定。在1990-1991年期间,我们发现了105个鸟巢(63个完好无损,42个退化);83%发生在突出的疏浚矸石基质上。加上其他年份的数据,130个鸟巢的平均窝仔数为35.1只(最小-最大= 17-52只)。大多数筑巢发生在4月20日至5月18日,每年约有一周的变化。孵化持续到整个八月。在我们保护的不受捕食者侵害的巢中,1990年的平均孵化成功率为78%(24个巢),1991年为66%(26个巢)。总体的性别比大约是1雄2雌,尽管个别的巢穴与阳光照射有关,从所有的雄性到所有的雌性都有所不同。
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引用次数: 3
Distribution and Status of the Alligator Snapping Turtle (Macrochelys temminckii) in Alabama 美国阿拉巴马州鳄鳄龟的分布和现状
IF 0.6 4区 环境科学与生态学 Q4 BIODIVERSITY CONSERVATION Pub Date : 2023-06-14 DOI: 10.1656/058.022.0sp1207
J. Godwin, A. Coleman, C. Guyer
Abstract - Macrochelys temminckii (Alligator Snapping Turtle) has experienced historical harvesting pressures that impact a number of current populations. Filling distribution gaps and obtaining demographic data can better inform conservation and management. We summarized multi-year samples targeting the Alligator Snapping Turtle in large river systems and major tributaries of Alabama. Although catch per unit effort was lower than observed in other states, we filled distribution gaps in several river systems. Though studies from other states documented effects of historical harvesting pressure on Alligator Snapping Turtle populations, mean adult mass of both sexes, mean carapace length, and capture ratio of adults to immatures suggested reduced pressures in Alabama and possible population stability. Nevertheless, smaller tributaries and creeks need to be surveyed for previously undetected populations with mark–recapture and movement studies.
摘要短吻鳄鳄龟(Macrochelys temminckii)经历了历史上的捕捞压力,影响了许多当前的种群。填补分布差距和获得人口统计数据可以更好地为保护和管理提供信息。我们总结了多年的样本针对鳄鱼鳄龟在大型河流系统和阿拉巴马州的主要支流。虽然单位捕捞量低于其他州,但我们填补了几个河流系统的分布空白。尽管来自其他州的研究记录了历史上的捕捞压力对鳄鳄鳄龟种群的影响,但两性的平均成年质量、平均甲壳长度和成年与未成年鳄鳄龟的捕获比例表明,阿拉巴马州的压力有所减轻,可能会保持种群稳定。然而,需要对较小的支流和小溪进行调查,以寻找以前未被发现的种群,并进行标记重新捕获和移动研究。
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引用次数: 1
A Temporal Assessment of the Demographic Structure of a Protected Alligator Snapping Turtle Population 受保护鳄龟种群人口结构的时间评价
IF 0.6 4区 环境科学与生态学 Q4 BIODIVERSITY CONSERVATION Pub Date : 2023-06-14 DOI: 10.1656/058.022.0sp1214
Aaron C. Johnson, Lori B. White, Samuel Holcomb, Mitchell J. Ray, J. L. Carr
Abstract - Macrochelys temminckii (Alligator Snapping Turtle) were commercially harvested for consumption, and Louisiana was the last state to ban this commerce. There are no demographic studies on healthy populations within the state. We conducted trapping surveys at Black Bayou Lake National Wildlife Refuge near Monroe, LA, from 2004 to 2020. We captured 90 individual Alligator Snapping Turtles over 17 years. We compared survey data between the 2004–2005 survey period and the 2019–2020 survey period to estimate changes in demography. We found the population to be stable, but the low number of juveniles captured raises concerns for the future of the population. Continued monitoring is recommended to evaluate the stability of the population.
摘要-鳄龟被商业捕捞用于消费,路易斯安那州是最后一个禁止这种商业的州。该州没有对健康人口进行人口统计研究。从2004年到2020年,我们在洛杉矶门罗附近的黑河口国家野生动物保护区进行了诱捕调查。我们在17年里捕获了90只鳄龟。我们比较了2004-2005年调查期间和2019-2020年调查期间的调查数据,以估计人口统计学的变化。我们发现种群数量保持稳定,但捕获的幼崽数量少,这引起了人们对种群未来的担忧。建议继续监测以评估种群的稳定性。
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引用次数: 2
Demography of an Urban Population of Alligator Snapping Turtles (Macrochelys temminckii) in Texas 德克萨斯州城市鳄鳄龟种群的人口学研究
IF 0.6 4区 环境科学与生态学 Q4 BIODIVERSITY CONSERVATION Pub Date : 2023-06-14 DOI: 10.1656/058.022.0sp1213
Eric C. Munscher, J. D. Riedle, Arron Tuggle, J. Gray, D. B. Ligon, V. Gladkaya, C. Drake, R. Couvillon, Jonathon Bolton, Madeleine Morrison, B. Butterfield, A. Walde
Abstract - Understanding population demographics of Macrochelys temminckii (Alligator Snapping Turtle) requires long-term studies. Most previous studies do not provide demographic population data. We conducted a mark–recapture study of M. temminckii inhabiting Buffalo Bayou in Harris County, TX, from October 2016 through August 2021. We captured 110 unique individuals during 465 trap nights and recorded 45 recaptures. We generated 8 biological metrics. Capture per unit effort varied from 0.267 to 0.547 turtles per trap-night, the population estimate was 173 turtles (95% CI:138–250), the sex ratio was 1.00 M:1.28 F, and density and biomass estimates were 4.43 turtles/river km and 89.9 kg/km, respectively. Given that anthropogenic risks to this urban population may increase, continued monitoring and research is warranted.
摘要:了解鳄鳄鳄龟(Macrochelys temminckii)的种群特征需要长期研究。大多数先前的研究没有提供人口统计数据。从2016年10月到2021年8月,我们对居住在德克萨斯州哈里斯县布法罗河的M. temminckii进行了一项标记重新捕获研究。我们在465个陷阱夜捕获了110个独特的个体,并记录了45次重新捕获。我们生成了8个生物指标。单位捕获量为0.267 ~ 0.547只/夜,种群估计值为173只(95% CI:138 ~ 250),性别比为1.00 M:1.28 F,密度和生物量估计值分别为4.43只/河km和89.9 kg/km。鉴于对城市人口的人为风险可能会增加,有必要继续进行监测和研究。
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引用次数: 1
期刊
Southeastern Naturalist
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