Pub Date : 2022-12-29DOI: 10.2744/1071-8443-21.2.287
{"title":"TURTLE POETRY","authors":"","doi":"10.2744/1071-8443-21.2.287","DOIUrl":"https://doi.org/10.2744/1071-8443-21.2.287","url":null,"abstract":"","PeriodicalId":126915,"journal":{"name":"Chelonian Conservation and Biology: Celebrating 25 Years as the World's Turtle and Tortoise Journal","volume":"9 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-12-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114647099","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Fábio A. G. Cunha, I. Sampaio, Jeferson Carneiro, R. Vogt, R. Mittermeier, A. Rhodin, M. Andrade
We describe a new species of small chelid turtle from perennial streams in the Araguaia River subbasin near Serra das Andorinhas State Park, São Geraldo do Araguaia, Pará, Brazil. It is morphologically distinct and the smallest known member of the genus Mesoclemmys, with an average straight-line carapace length (CL) of 144 mm and maximum recorded CL of 170 mm. The species has a moderate head width of approximately 20% of CL. The carapace and dorsal soft parts are blackish, the plastron is light brownish yellow with a blackish brown central plastral figure, and the ventral soft parts are pale yellow. It has the largest femoral scutes of any Mesoclemmys and its plastral contact formula is Intergular > Anal > Humeral > Femoral > Abdominal > Pectoral > Gular. We describe the shell and skull morphology of the new species and performed genetic analysis using mitochondrial DNA (cytochrome c oxidase, subunits I [COI] and 16S) to build a phylogenetic tree for the genus, which placed the new species as sister to M. vanderhaegei.
我们描述了一种新的小龟，来自巴西帕拉尔阿拉瓜亚州Serra das Andorinhas州立公园附近的阿拉瓜亚河亚盆地的多年生溪流。它形态独特，是Mesoclemmys属中已知最小的成员，平均直线甲壳长度(CL)为144毫米，最大记录的CL为170毫米。该物种头部宽度适中，约占总长度的20%。甲壳和背部软部为黑色，板为浅棕黄，中部板形为黑棕色，腹部软部为淡黄色。它的股鞘是所有系膜中最大的，其与肌间>肛>肱骨>股>腹>胸>肌。我们描述了新种的外壳和头骨形态，并利用线粒体DNA(细胞色素c氧化酶，I [COI]和16S亚基)进行了遗传分析，建立了该属的系统发育树，将新种定位为M. vanderhaegei的姐妹种。
{"title":"A New South American Freshwater Turtle of the Genus Mesoclemmys from the Brazilian Amazon (Testudines: Pleurodira: Chelidae)","authors":"Fábio A. G. Cunha, I. Sampaio, Jeferson Carneiro, R. Vogt, R. Mittermeier, A. Rhodin, M. Andrade","doi":"10.2744/CCB-1524.1","DOIUrl":"https://doi.org/10.2744/CCB-1524.1","url":null,"abstract":"We describe a new species of small chelid turtle from perennial streams in the Araguaia River subbasin near Serra das Andorinhas State Park, São Geraldo do Araguaia, Pará, Brazil. It is morphologically distinct and the smallest known member of the genus Mesoclemmys, with an average straight-line carapace length (CL) of 144 mm and maximum recorded CL of 170 mm. The species has a moderate head width of approximately 20% of CL. The carapace and dorsal soft parts are blackish, the plastron is light brownish yellow with a blackish brown central plastral figure, and the ventral soft parts are pale yellow. It has the largest femoral scutes of any Mesoclemmys and its plastral contact formula is Intergular > Anal > Humeral > Femoral > Abdominal > Pectoral > Gular. We describe the shell and skull morphology of the new species and performed genetic analysis using mitochondrial DNA (cytochrome c oxidase, subunits I [COI] and 16S) to build a phylogenetic tree for the genus, which placed the new species as sister to M. vanderhaegei.","PeriodicalId":126915,"journal":{"name":"Chelonian Conservation and Biology: Celebrating 25 Years as the World's Turtle and Tortoise Journal","volume":"5 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-12-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130796363","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Manuel Sá Sampaio, R. Rebelo, A. Regalla, C. Barbosa, P. Catry
Abstract. Predation of nests and hatchlings can significantly reduce sea turtle reproductive output. On Cavalos island, João Vieira and Poilão Marine National Park, Bijagos archipelago, Guinea-Bissau, one of the primary threats to green turtle nests is predation by Nile monitors (Varanus niloticus). In this study, we tested 3 different nest protection techniques—disguising scent cues, disguising visual cues, and placing a metal net over the nest—to reduce predation on green turtle (Chelonia mydas) nests by Nile monitors. Nests were monitored for 10 d after they were laid, and we found that using metal nets and disguising scent cues led to a significant increase of the number of days it took for Nile monitors to find and predate the nests. Overall reduction in predation rates also approached significance when metal nets or disguising scent cues were used. We used the Risk Reduction metric to compare the effectiveness of our experiment with other nest protection techniques; our results corresponded to a > 50% decrease in the risk of predation, a value comparable to or better than other techniques used elsewhere. We suggest that camouflaging a nest's scent may be the most cost-efficient management option to reduce predation rates by Nile monitors in sensitive areas without damaging the local ecosystem.
摘要捕食海龟巢和幼仔会显著减少海龟的繁殖量。在几内亚比绍比贾戈斯群岛的卡瓦尔沃斯岛，jo o Vieira和poil o海洋国家公园，绿海龟巢穴的主要威胁之一是尼罗河监视器(Varanus niloticus)的捕食。在这项研究中，我们测试了3种不同的巢保护技术——掩盖气味线索、掩盖视觉线索和在巢上放置金属网——以减少尼罗河监测仪对绿龟(Chelonia mydas)巢的捕食。在鸟巢产下后，我们对其进行了10天的监测，我们发现使用金属网和伪装气味线索会显著增加尼罗河监测员发现并提前发现鸟巢所需的天数。当使用金属网或伪装气味线索时，总体上捕食率的降低也接近显著。我们使用风险降低度量来比较我们的实验与其他巢保护技术的有效性;我们的结果表明，捕食风险降低了50%以上，这一数值与其他地方使用的其他技术相当或更好。我们认为，在不破坏当地生态系统的情况下，伪装巢穴的气味可能是最具成本效益的管理选择，可以减少尼罗河监测仪在敏感地区的捕食率。
{"title":"How to Reduce the Risk of Predation of Green Turtle Nests by Nile Monitors","authors":"Manuel Sá Sampaio, R. Rebelo, A. Regalla, C. Barbosa, P. Catry","doi":"10.2744/CCB-1553.1","DOIUrl":"https://doi.org/10.2744/CCB-1553.1","url":null,"abstract":"Abstract. Predation of nests and hatchlings can significantly reduce sea turtle reproductive output. On Cavalos island, João Vieira and Poilão Marine National Park, Bijagos archipelago, Guinea-Bissau, one of the primary threats to green turtle nests is predation by Nile monitors (Varanus niloticus). In this study, we tested 3 different nest protection techniques—disguising scent cues, disguising visual cues, and placing a metal net over the nest—to reduce predation on green turtle (Chelonia mydas) nests by Nile monitors. Nests were monitored for 10 d after they were laid, and we found that using metal nets and disguising scent cues led to a significant increase of the number of days it took for Nile monitors to find and predate the nests. Overall reduction in predation rates also approached significance when metal nets or disguising scent cues were used. We used the Risk Reduction metric to compare the effectiveness of our experiment with other nest protection techniques; our results corresponded to a > 50% decrease in the risk of predation, a value comparable to or better than other techniques used elsewhere. We suggest that camouflaging a nest's scent may be the most cost-efficient management option to reduce predation rates by Nile monitors in sensitive areas without damaging the local ecosystem.","PeriodicalId":126915,"journal":{"name":"Chelonian Conservation and Biology: Celebrating 25 Years as the World's Turtle and Tortoise Journal","volume":"123 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-12-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122084809","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
A. Mobaraki, A. D. Phillott, Malihe Erfani, M. Ghasemi, Hossein Jafari
Abstract. This study presents the first published data on the morphometrics of nesting hawksbill turtles (Eretmochelys imbricata) and their eggs and counts of yolked and yolkless eggs per clutch from Iranian Islands in the northern Persian Gulf. We found significant variation in some variables among 4 main nesting islands (e.g., weight of yolked eggs, p = 0.000; number of yolkless eggs per clutch, p = 0.017), but effect size was moderate or less (r < 0.5 or d < 0.8). The diameter (p = 0.039), weight (p = 0.028), and number of yolked eggs (p = 0.000) per clutch increased significantly with curved carapace length (CCL), but the effect size was only large for the number of yolked eggs (f2 = 0.152). The number of yolkless eggs did not vary with CCL (p = 0.453) or with the number of yolked eggs (p = 0.523). A meta-analysis of global hawksbill turtle morphometrics and reproductive output revealed significant variation in CCL (p = 0.000) and number of yolked eggs (p < 0.001), with nesting region having a very large effect size on both variables (g2 = 0.880 and 0.616, respectively). Hawksbill turtles from the Gulf were smaller than populations from the Gulf of Oman (p < 0.001), Arabian Sea (p = 0.000), Caribbean (p = 0.000), West Atlantic (p = 0.000), and Southwest Pacific (p = 0.000) but not the Red Sea (p = 0.104), and laid fewer yolked eggs than populations in the Caribbean (p < 0.001) and West Atlantic (p = 0.001) but not the Red Sea (p = 0.636). This may be due to hawksbill turtles nesting in the Gulf remaining within its waters postnesting so adult body size is restricted by the relatively poor foraging habitat and/or success and/or the extreme environments, subsequently limiting clutch size. More information on home range and foraging habitat is required to draw similar conclusions about hawksbill turtles nesting in the Red Sea. Hawksbill turtles nesting in the Gulf, Red Sea, and Arabian Sea also appear to lay larger number of yolkless eggs per clutch than other populations worldwide (mean = 17.6 ± 10.8 SD [range = 0–59]). The functional role of yolkless eggs, potentially in the maintenance of thermal and hydric conditions within tolerable conditions in shallow nests laid in extreme environments, requires further investigation. Similarly, the potential for yolkless eggs to be an adaptation to extreme nest environments in other sea turtle species also nesting in the northern Indian Ocean also warrants examination.
{"title":"Inferred Impacts of Extreme Environments on Hawksbill Turtle (Eretmochelys imbricata) Body Size and Reproductive Output","authors":"A. Mobaraki, A. D. Phillott, Malihe Erfani, M. Ghasemi, Hossein Jafari","doi":"10.2744/CCB-1546.1","DOIUrl":"https://doi.org/10.2744/CCB-1546.1","url":null,"abstract":"Abstract. This study presents the first published data on the morphometrics of nesting hawksbill turtles (Eretmochelys imbricata) and their eggs and counts of yolked and yolkless eggs per clutch from Iranian Islands in the northern Persian Gulf. We found significant variation in some variables among 4 main nesting islands (e.g., weight of yolked eggs, p = 0.000; number of yolkless eggs per clutch, p = 0.017), but effect size was moderate or less (r < 0.5 or d < 0.8). The diameter (p = 0.039), weight (p = 0.028), and number of yolked eggs (p = 0.000) per clutch increased significantly with curved carapace length (CCL), but the effect size was only large for the number of yolked eggs (f2 = 0.152). The number of yolkless eggs did not vary with CCL (p = 0.453) or with the number of yolked eggs (p = 0.523). A meta-analysis of global hawksbill turtle morphometrics and reproductive output revealed significant variation in CCL (p = 0.000) and number of yolked eggs (p < 0.001), with nesting region having a very large effect size on both variables (g2 = 0.880 and 0.616, respectively). Hawksbill turtles from the Gulf were smaller than populations from the Gulf of Oman (p < 0.001), Arabian Sea (p = 0.000), Caribbean (p = 0.000), West Atlantic (p = 0.000), and Southwest Pacific (p = 0.000) but not the Red Sea (p = 0.104), and laid fewer yolked eggs than populations in the Caribbean (p < 0.001) and West Atlantic (p = 0.001) but not the Red Sea (p = 0.636). This may be due to hawksbill turtles nesting in the Gulf remaining within its waters postnesting so adult body size is restricted by the relatively poor foraging habitat and/or success and/or the extreme environments, subsequently limiting clutch size. More information on home range and foraging habitat is required to draw similar conclusions about hawksbill turtles nesting in the Red Sea. Hawksbill turtles nesting in the Gulf, Red Sea, and Arabian Sea also appear to lay larger number of yolkless eggs per clutch than other populations worldwide (mean = 17.6 ± 10.8 SD [range = 0–59]). The functional role of yolkless eggs, potentially in the maintenance of thermal and hydric conditions within tolerable conditions in shallow nests laid in extreme environments, requires further investigation. Similarly, the potential for yolkless eggs to be an adaptation to extreme nest environments in other sea turtle species also nesting in the northern Indian Ocean also warrants examination.","PeriodicalId":126915,"journal":{"name":"Chelonian Conservation and Biology: Celebrating 25 Years as the World's Turtle and Tortoise Journal","volume":"79 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-12-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130347949","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Austin M.A. Bohannon, Lawrence G. Bassett, S. Sirsi, Andrew R MacLaren, D. H. Foley, S. Fritts, Laura R. Pharr, M. Forstner
Abstract. Testudines is a reptilian order characterized by low annual recruitment and delayed sexual maturity. One testudine species of conservation concern is the Rio Grande cooter (Pseudemys gorzugi), a taxon native to the southwestern United States and the westernmost species in this genus. A clear understanding of the reproductive biology of turtle species in the wild better informs conservation management options. The reproductive biology of P. gorzugi has been formerly investigated in the Black River of southeastern New Mexico. Because life history strategies of chelonian taxa may vary across geographic gradients, we examined the reproductive biology of this species at 3 sites in west Texas from 2017 to 2019. We detected follicle enlargement beginning in the fall with shelled eggs appearing as early as 7 April and as late as 12 August. We found a significant quadratic relationship between day of year and maximum follicle diameter (r2 = 0.22, F2,100 = 15.61; p < 0.05). A significant relationship between turtle size and clutch size was not detected nor was there a significant relationship between turtle size and egg width. We detected a record clutch size of 17 eggs and a mean ± SD clutch size of 11.4 ± 3.11. We observed a single instance of production of 2 clutches. The smallest gravid female we detected with shelled eggs had a plastron length of 179 mm. We also found that the probability of capturing a female gravid with shelled eggs was highest in early June. Our results suggest geographic variation occurs in the reproductive biology of P. gorzugi and highlight the importance of range-wide, temporally extensive sampling. Data presented herein can be included in population viability assessments and inform conservation recovery plans. Resúmen. Testudines es un orden de reptiles caracterizado por un bajo reclutamiento anual y una madurez sexual tardía. Una especie testudina de interés para la conservación es la tortuga del Río Grande (Pseudemys gorzugi), un taxón nativo del suroeste de los Estados Unidos y la especie más occidental de este género. Una comprensión clara de la biología reproductiva de las especies de tortugas en la naturaleza brinda mejor información a las opciones de manejo y conservación. La biología reproductiva de P. gorzugi se ha investigado anteriormente en el Río Negro del sureste de Nuevo México. Debido a que las estrategias de historia de vida de los taxones de quelonios pueden variar según los gradientes geográficos, examinamos la biología reproductiva de esta especie en tres sitios en el oeste de Texas entre el 2017 y 2019. Detectamos el agrandamiento del folículo a partir del otoño con la aparición de huevos sin cáscara desde el 7 de abril y tan tarde como el 12 de agosto. Encontramos una relación cuadrática significativa entre el día del año y el diámetro máximo del folículo (r2 = 0.22, F2,100 = 15.61; p < 0.05). No se detectó una relación significativa entre el tamaño de la tortuga y el tamaño de la nidada ni hubo
摘要鼠是一种爬行动物目，其特点是每年招募的数量少，性成熟时间晚。一个值得保护的龟类物种是里奥格兰德龟(Grande coter)，这是一个原产于美国西南部的分类群，也是该属中最西端的物种。清楚地了解野生海龟的繁殖生物学，可以更好地为保护管理提供信息。以前在新墨西哥州东南部的黑河中对p.g orzugi的生殖生物学进行了研究。由于龟类类群的生活史策略可能因地理梯度而异，我们于2017年至2019年在德克萨斯州西部的3个地点对该物种的生殖生物学进行了研究。我们发现卵泡增大始于秋季，最早于4月7日至8月12日出现有壳的卵子。我们发现，一年中的一天与最大卵泡直径之间存在显著的二次关系(r2 = 0.22, f2100 = 15.61;P < 0.05)。龟的大小和卵的大小之间没有显著的关系，龟的大小和卵的宽度之间也没有显著的关系。我们检测到有记录的17只卵，平均±SD卵数为11.4±3.11。我们观察到一个生产2个离合器的实例。我们发现的最小的带壳雌孕卵的板长为179毫米。我们还发现，6月初捕获带壳卵雌龟的概率最高。我们的研究结果表明，在p.g orzugi的生殖生物学中存在地理差异，并强调了范围广泛，时间广泛采样的重要性。这里提供的数据可以纳入种群生存能力评估，并为保护恢复计划提供信息。Resumen。蜥蜴是爬行动物的一种顺序，其特征是每年都有一种罕见的性行为tardía。1 .特别研究通过conservación与Río Grande (pseudomys gorzugi)进行的跨组织的交换，并研究taxón通过特别研究通过más与西方的跨组织的交换的交换。Una comprensión clara de la biología繁殖的物种de tortugas en la naturaleza brinda major información和las opciones de manejo y conservación。[biología . gorzugi .的生殖研究][Río . neevo m诈骗案的调查]。dededo a que las strategias de historia de vida de los taxones de quelonios pueden var según los gradientes geográficos, examinamos la biología reproductiva de esta，特别是在得克萨斯州中心的三个位置上，从2017年到2019年。1 .在1月7日与1月12日在1月12日与1月12日在1月7日与1月7日在1月7日与1月12日在1月12日在1月31日与1月31日在1月31日在1月31日与1月31日在1月31日在1月31日与1月31日在1月31日在1月31日。Encontramos una relación cuadrática显著性中心el día del año y el diámetro máximo del folículo (r2 = 0.22, f2100 = 15.61;P < 0.05)。No se detectó una relación significativa entre el tamaño de la tortuga el tamaño de la nidada ni hubo una relación significativa entre el tamaño de la tortuga el ancho del huevo。Detectamos un tamaño r de nada de 17; Detectamos un tamaño medium±de de nada de 11.4±3.11。观察站在单独的caso - producción - de - nidadas。La hembra grávida más pequeña que detectamos con huevos sin cáscara tenía una longitude de plastrón de 179 mm。tamambiacos与捕获可能性的关系:grávida与捕获可能性的关系:cáscara与捕获可能性的关系:más与年轻原则的关系。新研究结果表明，在不同的时间点，不同的时间点产生不同的细菌variación geográfica和biología。在提交的文件中提交的数据包括:关于可行性的评估(población)和关于非正式损失平面(recuperación和conservación)。
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Zohreh Nasiri, M. Gholamalifard, S. M. Ghasempouri
Abstract. Nest site selection is an important aspect of reproductive behavior in sea turtles, and it is influenced by biotic and abiotic beach characteristics. To date, the association between nesting beach characteristics and nest site selection has been explored manually at small scales; yet, hawksbill turtles (Eretmochelys imbricata) nest on a variety of beaches, with knowledge remaining limited on preferred habitat. Here, unmanned aerial vehicles were used to assess all available beaches, identify common characteristics, and determine the preferred nesting sites for hawksbill turtles in the Persian Gulf. High resolution photographs were taken of 236 nests with unmanned aerial vehicles on 7 main islands supporting 10 nesting beaches. The physical characteristics of these nests were photographed (e.g., elevation, slope, vegetation cover, and nest distance from vegetation and the high tide line). Slope was the most important factor regulating nesting activity. Most turtles nested on shallow-sloped beaches with 5° slopes or less (61.4%), at a distance of ≤ 15 m from the high tide line (71.8%), and generally ranged from 1 to 3 m (83.9%) above sea level. Most nests (87.7%) were laid close to the vegetation line (≤ 5 m) in sandy zones. Although there was high geomorphological diversity in landform among the islands, nesting habitat characteristics of hawksbills were consistent. Unmanned aerial vehicles provide a useful approach for identifying the nesting habitat preferences of sea turtles in a time- and cost-efficient manner, covering more surface while minimally disturbing fragile habitat.
{"title":"Determining Nest Site Selection by Hawksbill Sea Turtles in the Persian Gulf Using Unmanned Aerial Vehicles","authors":"Zohreh Nasiri, M. Gholamalifard, S. M. Ghasempouri","doi":"10.2744/CCB-1552.1","DOIUrl":"https://doi.org/10.2744/CCB-1552.1","url":null,"abstract":"Abstract. Nest site selection is an important aspect of reproductive behavior in sea turtles, and it is influenced by biotic and abiotic beach characteristics. To date, the association between nesting beach characteristics and nest site selection has been explored manually at small scales; yet, hawksbill turtles (Eretmochelys imbricata) nest on a variety of beaches, with knowledge remaining limited on preferred habitat. Here, unmanned aerial vehicles were used to assess all available beaches, identify common characteristics, and determine the preferred nesting sites for hawksbill turtles in the Persian Gulf. High resolution photographs were taken of 236 nests with unmanned aerial vehicles on 7 main islands supporting 10 nesting beaches. The physical characteristics of these nests were photographed (e.g., elevation, slope, vegetation cover, and nest distance from vegetation and the high tide line). Slope was the most important factor regulating nesting activity. Most turtles nested on shallow-sloped beaches with 5° slopes or less (61.4%), at a distance of ≤ 15 m from the high tide line (71.8%), and generally ranged from 1 to 3 m (83.9%) above sea level. Most nests (87.7%) were laid close to the vegetation line (≤ 5 m) in sandy zones. Although there was high geomorphological diversity in landform among the islands, nesting habitat characteristics of hawksbills were consistent. Unmanned aerial vehicles provide a useful approach for identifying the nesting habitat preferences of sea turtles in a time- and cost-efficient manner, covering more surface while minimally disturbing fragile habitat.","PeriodicalId":126915,"journal":{"name":"Chelonian Conservation and Biology: Celebrating 25 Years as the World's Turtle and Tortoise Journal","volume":"27 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-12-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125111065","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
D. Margaritoulis, Gonçalo Lourenço, Thomas E. Riggall, A. Rees
Abstract. Here we present 38 yrs of nesting data of the loggerhead population in Laganas Bay, Zakynthos, Greece, adding data for 2010–2021 to existing published data for 1984–2009. This rookery, encompassing 6 discrete beaches of 5.5 km total length, features the highest nesting density in the Mediterranean. The annual nest numbers, ranging from 667 to 2018, showed no significant long-term trend. Beach nesting contributions increased on some public-accessed beaches (as did nesting success), but decreased on a remote beach that previously held > 50% of all nests. These changes might be attributed to management actions by the National Marine Park of Zakynthos that improved conditions for sea turtles (e.g., restricting nighttime access to the public), indicating that the previously recorded high nesting density on the remote beach may have been atypical. Although no significant phenological changes were detected with the available data in the 20-yr period 2002–2021, the date of the first hatched nest shifted significantly toward earlier dates in the 38-yr data set. Clutch size and body size of nesting turtles exhibited significantly decreasing trends. Hatching success, hatchling emergence success, and in-nest hatchling mortality showed significantly increasing trends. The number of viable hatchlings decreased over the seasons, albeit not significantly, possibly a result of the decreasing clutch size. Incubation durations were revealed as shortening on all beaches, a potential sign of global warming, with a consequent suggested increase of female primary sex ratio. Continuation of this long-term monitoring program is expected to provide further insights in the reproductive traits of this regionally important loggerhead population.
{"title":"Thirty-Eight Years of Loggerhead Turtle Nesting in Laganas Bay, Zakynthos, Greece: A Review","authors":"D. Margaritoulis, Gonçalo Lourenço, Thomas E. Riggall, A. Rees","doi":"10.2744/CCB-1531.1","DOIUrl":"https://doi.org/10.2744/CCB-1531.1","url":null,"abstract":"Abstract. Here we present 38 yrs of nesting data of the loggerhead population in Laganas Bay, Zakynthos, Greece, adding data for 2010–2021 to existing published data for 1984–2009. This rookery, encompassing 6 discrete beaches of 5.5 km total length, features the highest nesting density in the Mediterranean. The annual nest numbers, ranging from 667 to 2018, showed no significant long-term trend. Beach nesting contributions increased on some public-accessed beaches (as did nesting success), but decreased on a remote beach that previously held > 50% of all nests. These changes might be attributed to management actions by the National Marine Park of Zakynthos that improved conditions for sea turtles (e.g., restricting nighttime access to the public), indicating that the previously recorded high nesting density on the remote beach may have been atypical. Although no significant phenological changes were detected with the available data in the 20-yr period 2002–2021, the date of the first hatched nest shifted significantly toward earlier dates in the 38-yr data set. Clutch size and body size of nesting turtles exhibited significantly decreasing trends. Hatching success, hatchling emergence success, and in-nest hatchling mortality showed significantly increasing trends. The number of viable hatchlings decreased over the seasons, albeit not significantly, possibly a result of the decreasing clutch size. Incubation durations were revealed as shortening on all beaches, a potential sign of global warming, with a consequent suggested increase of female primary sex ratio. Continuation of this long-term monitoring program is expected to provide further insights in the reproductive traits of this regionally important loggerhead population.","PeriodicalId":126915,"journal":{"name":"Chelonian Conservation and Biology: Celebrating 25 Years as the World's Turtle and Tortoise Journal","volume":"23 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-12-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129846341","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Lawrence G. Bassett, Ivana Mali, W. Nowlin, D. H. Foley, M. Forstner
Abstract. The Rio Grande cooter (Pseudemys gorzugi) is an imperiled freshwater turtle native to the southwestern United States and northeastern Mexico. Previous studies investigating P. gorzugi diet have focused on the population occupying the Black River drainage in southeastern New Mexico, while Texas populations have remained unexamined. During the summer and fall of 2020, we studied the dietary habits of P. gorzugi and the syntopic red-eared slider (Trachemys scripta elegans) at San Felipe Creek, Texas, USA using fecal content and stable isotope analyses. We also compared the isotopic niches of these 2 co-occurring turtle species. Filamentous algae were, volumetrically, the most important food item for male, female, and juvenile P. gorzugi. Stable isotope mixing models indicated that lotic and lentic filamentous algae had the greatest proportional contribution to P. gorzugi and T. s. elegans diets, respectively. Stable isotope dietary mixing models also indicate T. s. elegans had a more carnivorous diet, composed mostly of red-rimmed melania (Melanoides tuberculata) and red swamp crayfish (Procambarus clarkii). Carnivory in this species was further supported by enriched δ15N values and higher trophic position estimates. Pseudemys gorzugi and T. s. elegans had δ13C and δ15N signatures that significantly differed, and the 2 species showed little overlap in isotopic niche space, suggesting a low likelihood of intense resource competition. Our results demonstrate that the diet of P. gorzugi, and the isotopic niche overlap between P. gorzugi and T. s. elegans at San Felipe Creek differ from that in the Black River drainage of New Mexico. The information provided here contributes toward a more complete understanding of P. gorzugi ecology, is useful for identifying suitable habitat worthy of conservation, and can help guide the development of feeding regimes for captive assurance colonies. Resúmen. La tortuga de Río Grande (Pseudemys gorzugi) es una tortuga de agua dulce en peligro nativa del suroeste de los Estados Unidos y el noreste de México. Estudios previos que han investigado la dieta de P. gorzugi se han enfocado en la población que ocupa el drenaje del Black River en el sureste de Nuevo México, sin embargo, las poblaciones de Texas no han sido examinadas. Durante el verano y el otoño de 2020, estudiamos los hábitos alimentarios de P. gorzugi y la tortuga de orejas rojas sintópica (Trachemys scripta elegans) en San Felipe Creek, Texas, EE. UU. mediante un análisis de contenidos fecales e isótopos estables. Incluso comparamos los nichos isotópicos de estas dos especies de tortugas en coexistencia. Las algas filamentosas fueron, volumétricamente, el alimento más importante para machos, hembras y juveniles de P. gorzugi. Los modelos de mezcla de isótopos estables indican que las algas filamentosas lóticas y lénticas contribuyen en mayor parte proporcionalmente a las dietas de P. gorzugi y T. s. elegans, respectivamente. Los modelos de mezcla di
摘要里奥格兰德龟是一种濒危的淡水龟，原产于美国西南部和墨西哥东北部。先前调查p.g orzugi饮食的研究主要集中在新墨西哥州东南部黑河流域的种群，而德克萨斯州的种群仍未被调查。在2020年夏季和秋季，我们利用粪便含量和稳定同位素分析研究了美国德克萨斯州圣费利佩溪的p.g orzugi和合群红耳滑鼠(Trachemys scripta elegans)的饮食习惯。我们还比较了这两种共生龟的同位素生态位。从体积上看，丝状藻类是雄性、雌性和幼鱼最重要的食物。稳定同位素混合模型表明，丝状藻和长丝藻分别对高尔祖假单胞菌和秀丽隐杆线虫的食物贡献最大。稳定同位素饮食混合模型还表明，秀丽隐杆线虫具有更多的肉食性饮食，主要由红边黑melanides tuberculata和红色沼泽小龙虾Procambarus clarkii组成。丰富的δ15N值和较高的营养位置估计进一步支持了该物种的食肉性。假线虫和秀丽隐杆线虫的δ13C和δ15N特征差异显著，同位素生态位空间重叠较少，资源竞争激烈的可能性较低。研究结果表明，圣费利佩河流域p.g orzugi的饮食以及p.g orzugi与秀丽隐杆线虫之间的同位素生态位重叠与新墨西哥州黑河流域的不同。本文提供的信息有助于更全面地了解p.g orzugi生态学，有助于确定值得保护的合适栖息地，并有助于指导圈养保证种群的喂养制度的发展。Resumen。Río Grande (pseudomys gorzugi)是在墨西哥境内的墨西哥人，在墨西哥境内的墨西哥人，在墨西哥境内的墨西哥人，在墨西哥境内的墨西哥人。工作室之前的调查是关于P. gorzugi的调查是关于对黑河的调查是关于对新墨西哥的调查是关于新墨西哥的调查是关于新墨西哥的调查是关于德克萨斯的调查。Durante el verano y el otoño de 2020, estudiamos los hábitos alimentarios de P. gorzugi y la tortuga de orejas rojas sintópica (Trachemys scripta elegans) en San Felipe Creek, Texas, EE。UU。调解联合国análisis de contenidos fecales e isótopos建立。包括比较的两个nichos isotópicos de estas两个物种的酷刑在共存。Las algas filamentosas fueron, voluumsamtricamente, el alimento más重要的para machos，胚胎与幼虫的P. gorzugi。洛杉矶莫德罗de mezcla de同位素estable糖苷,拉斯维加斯水藻filamentosas loticas y lenticas病在市长杰克逊proporcionalmente las饮食de p . gorzugi y t . s .线虫respectivamente。[1] [1] [1] [1] [1] [1] [1] [1] [1] [1] [1] [1] [1] [1] [1] [1] [1] [1] [1] [1] [1] [1] [1] [1] [1] [1] [1] [1] [1] [1] [1] [1] [1] [1] [1] [1] [1]La característica carnívora en esta especitue respalada aún más por valores de δ15N enriquecidos y estimaciones de posición trófica más altas。伪线虫(pseudmyys gorzugi)与秀丽隐杆线虫(t.s.e elegans)的δ13C y δ15N que diferían的显著性，与物种最相似的δ13C y δ15N que diferían的显著性有关，与物种最相似的δ13C y δ15N que diferían的显著性有关，与物种最相似的δ13C y δ15N que的显著性有关。新的研究结果表明，在圣费利佩河上，gorzugi与T. s. elegans在新msamicxico的黑河上，gorzugi与T. s. elegans在新msamicxico的不同点。可以看看proporcionada aqui contribuye联合国conocimiento mas completo de La ecologia de p . gorzugi es util仲要联合国生境adecuado digno de conservacion y喝水收效guiar el desarrollo de养生法德alimentacion para colonias de seguridad cautivas。
{"title":"Diet and Isotopic Niche of the Rio Grande Cooter (Pseudemys gorzugi) and Syntopic Red-eared Slider (Trachemys scripta elegans) in San Felipe Creek, Texas, USA","authors":"Lawrence G. Bassett, Ivana Mali, W. Nowlin, D. H. Foley, M. Forstner","doi":"10.2744/CCB-1556.1","DOIUrl":"https://doi.org/10.2744/CCB-1556.1","url":null,"abstract":"Abstract. The Rio Grande cooter (Pseudemys gorzugi) is an imperiled freshwater turtle native to the southwestern United States and northeastern Mexico. Previous studies investigating P. gorzugi diet have focused on the population occupying the Black River drainage in southeastern New Mexico, while Texas populations have remained unexamined. During the summer and fall of 2020, we studied the dietary habits of P. gorzugi and the syntopic red-eared slider (Trachemys scripta elegans) at San Felipe Creek, Texas, USA using fecal content and stable isotope analyses. We also compared the isotopic niches of these 2 co-occurring turtle species. Filamentous algae were, volumetrically, the most important food item for male, female, and juvenile P. gorzugi. Stable isotope mixing models indicated that lotic and lentic filamentous algae had the greatest proportional contribution to P. gorzugi and T. s. elegans diets, respectively. Stable isotope dietary mixing models also indicate T. s. elegans had a more carnivorous diet, composed mostly of red-rimmed melania (Melanoides tuberculata) and red swamp crayfish (Procambarus clarkii). Carnivory in this species was further supported by enriched δ15N values and higher trophic position estimates. Pseudemys gorzugi and T. s. elegans had δ13C and δ15N signatures that significantly differed, and the 2 species showed little overlap in isotopic niche space, suggesting a low likelihood of intense resource competition. Our results demonstrate that the diet of P. gorzugi, and the isotopic niche overlap between P. gorzugi and T. s. elegans at San Felipe Creek differ from that in the Black River drainage of New Mexico. The information provided here contributes toward a more complete understanding of P. gorzugi ecology, is useful for identifying suitable habitat worthy of conservation, and can help guide the development of feeding regimes for captive assurance colonies. Resúmen. La tortuga de Río Grande (Pseudemys gorzugi) es una tortuga de agua dulce en peligro nativa del suroeste de los Estados Unidos y el noreste de México. Estudios previos que han investigado la dieta de P. gorzugi se han enfocado en la población que ocupa el drenaje del Black River en el sureste de Nuevo México, sin embargo, las poblaciones de Texas no han sido examinadas. Durante el verano y el otoño de 2020, estudiamos los hábitos alimentarios de P. gorzugi y la tortuga de orejas rojas sintópica (Trachemys scripta elegans) en San Felipe Creek, Texas, EE. UU. mediante un análisis de contenidos fecales e isótopos estables. Incluso comparamos los nichos isotópicos de estas dos especies de tortugas en coexistencia. Las algas filamentosas fueron, volumétricamente, el alimento más importante para machos, hembras y juveniles de P. gorzugi. Los modelos de mezcla de isótopos estables indican que las algas filamentosas lóticas y lénticas contribuyen en mayor parte proporcionalmente a las dietas de P. gorzugi y T. s. elegans, respectivamente. Los modelos de mezcla di","PeriodicalId":126915,"journal":{"name":"Chelonian Conservation and Biology: Celebrating 25 Years as the World's Turtle and Tortoise Journal","volume":"8 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-12-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124677081","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Abstract. The southwestern pond turtle (Actinemys pallida), a chelonian species declining in California, depends on aquatic habitats for its survival. This study examined the extent to which the southwestern pond turtle used livestock ponds in rangeland habitat in eastern Santa Clara County, California, and the importance of key habitat features as factors in the presence of turtles in livestock ponds. We found that 12 of the 16 ponds (75%) previously documented to have southwestern pond turtles within the last 15 yrs still supported individuals, while only 1 of 62 ponds (2%) not previously documented as occupied, had turtles, indicating that livestock ponds, especially those known to be occupied, provide important, long-term habitat for this species.
{"title":"Livestock Ponds as Long-Term Habitat for Southwestern Pond Turtles (Actinemys pallida) in Rangeland Landscapes","authors":"Billy Tu, L. Trulio","doi":"10.2744/CCB-1526.1","DOIUrl":"https://doi.org/10.2744/CCB-1526.1","url":null,"abstract":"Abstract. The southwestern pond turtle (Actinemys pallida), a chelonian species declining in California, depends on aquatic habitats for its survival. This study examined the extent to which the southwestern pond turtle used livestock ponds in rangeland habitat in eastern Santa Clara County, California, and the importance of key habitat features as factors in the presence of turtles in livestock ponds. We found that 12 of the 16 ponds (75%) previously documented to have southwestern pond turtles within the last 15 yrs still supported individuals, while only 1 of 62 ponds (2%) not previously documented as occupied, had turtles, indicating that livestock ponds, especially those known to be occupied, provide important, long-term habitat for this species.","PeriodicalId":126915,"journal":{"name":"Chelonian Conservation and Biology: Celebrating 25 Years as the World's Turtle and Tortoise Journal","volume":"45 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-12-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132850687","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Abstract. The eruption of Mount Pinatubo in the Philippines in June 1991 reduced global temperatures over the following 2 yrs. The greatest suppression (apart from Antarctica) was centered in the northern Great Plains of North America, directly over my long-term turtle study site. Temperatures at that site in 1992 and 1993 were the coldest in at least 50 yrs. Normal annual hatchling recruitment of yellow mud turtles (Kinosternon flavescens) in the spring following incubation at that site averaged 375; however, only 3 hatchlings emerged in 1993 (1992 incubation cohort), and none emerged in 1994 (1993 incubation cohort). The depressed temperatures apparently prolonged incubation times to such an extent in 1992 and 1993 that hatching was nearly impossible before winter mortality. The result was a gap in the age class structure that was still evident 26 yrs later. This site is at the northern range limit of this species, and this event suggests that incubation temperatures (i.e., summer season length) may be responsible for that limit.
{"title":"Climate-Mediated Recruitment Failure in a Turtle Population and Its Bearing on Northern Limits of Distribution","authors":"J. Iverson","doi":"10.2744/CCB-1554.1","DOIUrl":"https://doi.org/10.2744/CCB-1554.1","url":null,"abstract":"Abstract. The eruption of Mount Pinatubo in the Philippines in June 1991 reduced global temperatures over the following 2 yrs. The greatest suppression (apart from Antarctica) was centered in the northern Great Plains of North America, directly over my long-term turtle study site. Temperatures at that site in 1992 and 1993 were the coldest in at least 50 yrs. Normal annual hatchling recruitment of yellow mud turtles (Kinosternon flavescens) in the spring following incubation at that site averaged 375; however, only 3 hatchlings emerged in 1993 (1992 incubation cohort), and none emerged in 1994 (1993 incubation cohort). The depressed temperatures apparently prolonged incubation times to such an extent in 1992 and 1993 that hatching was nearly impossible before winter mortality. The result was a gap in the age class structure that was still evident 26 yrs later. This site is at the northern range limit of this species, and this event suggests that incubation temperatures (i.e., summer season length) may be responsible for that limit.","PeriodicalId":126915,"journal":{"name":"Chelonian Conservation and Biology: Celebrating 25 Years as the World's Turtle and Tortoise Journal","volume":"109 4 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-12-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129062361","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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