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Ultrastructural Study of Limb Bud Development in Green Turtles Chelonia mydas
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作者 Nawal AL-MUKHAINI Taher BA-OMAR Ibrahim MAHMOUD 《Asian Herpetological Research》 SCIE 2012年第1期69-78,共10页
Morphological changes during the embryonic development of limbs of the green turtle,Chelonia mydas,were studied during the entire period of incubation,using transmission and scanning electron microscopy(TEM and SEM). ... Morphological changes during the embryonic development of limbs of the green turtle,Chelonia mydas,were studied during the entire period of incubation,using transmission and scanning electron microscopy(TEM and SEM). Limb buds were first observed at Stage 2. At that stage,the tip was covered with an apical ectodermal ridge(AER) which began to regress at Stage 6. Associated with AER was the presence of the mesenchymal cells which,consequently,differentiated into muscles,cartilage and bones. The gross features of the skeletal development appeared as a condensation of the cartilaginous structures in the proximal distal region of the limbs. The primordial digits were gradually enclosed by hard keratinized webbed skin. The increase in rate of ossification and skin pigmentation was correlated with the growth of the limbs. The development of the limbs was closely related to the transitional appearance of mucus secretion from the epidermis. 展开更多
关键词 green turtle chelonia mydas turtle embryology limb bud development ULTRASTRUCTURE
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Tracking the Confiscated Green Sea Turtles in the South China Sea:Where Did They Come From?Where Will They Go?
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作者 Min CHEN Tong HUANG +7 位作者 Dayi NIE Liu LIN Fang CHEN Jing WANG Jinyan YANG Jing ZHANG Tong LIU Yiqiong CUI 《Asian Herpetological Research》 SCIE CSCD 2024年第3期173-182,共10页
The population of the green sea turtle(Chelonia mydas)is under decline,threatened by bycatch and illegal acquisition despite worldwide protection efforts.However,the confiscation of illegally acquired sea turtles coul... The population of the green sea turtle(Chelonia mydas)is under decline,threatened by bycatch and illegal acquisition despite worldwide protection efforts.However,the confiscation of illegally acquired sea turtles could aid in tracking their origin and movement patterns,crucial for effective conservation strategies.Combining satellite tracking and genetic analysis offers an opportunity to investigate the relationship between the origins and migration directions of green sea turtles in the western Pacific.Here,we applied two methods to investigate the spatial ecology of 18 green turtles caught as bycatch in the South China Sea.Our results revealed the genetic origins and diverse movements of the turtles.Bayesian Mixed Stock Analysis(MSA)suggested that these turtles originated from the rookery of the Xisha Islands(49.6%),central Ryukyu(24.6%),NE Borneo(8%),and the Sulu Sea(5.2%),with other rookeries in meagre proportions(<2%each).Satellite tracking showed the ranges of their travel were smaller than the whole contributed rookery range,but diverse.The haplotype diversity of these turtles is high,and CmP19 stands out as both the most frequent and the most diverse haplotype in terms of swimming destinations.These results indicate that the South China Sea is likely an important transportation hub and mating spot for green turtles.Our findings provided evidence for the rehabilitation of these green turtles in the wild and illustrated the complexity of movement during the green turtle’s life history,and the“mixed backgrounds”of the green turtles also highlight the need for joint conservation efforts of neighbouring countries in the South China Sea. 展开更多
关键词 conservation GENETICS green sea turtle(chelonia mydas) movement rookery satellite tracking
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Movements and diving behavior of internesting green turtles along Pacific Costa Rica
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作者 Gabriela S.BLANCO Stephen J.MORREALE +3 位作者 Jeffrey A.SEMINOFF Frank V.PALADINO Rotney PIEDRA James R.SPOTILA 《Integrative Zoology》 SCIE CSCD 2013年第3期293-306,共14页
Using satellite transmitters,we determined the internesting movements,spatial ecology and diving behavior of East Pacific green turtles(Chelonia mydas)nesting on Nombre de Jesús and Zapotillal beaches along the P... Using satellite transmitters,we determined the internesting movements,spatial ecology and diving behavior of East Pacific green turtles(Chelonia mydas)nesting on Nombre de Jesús and Zapotillal beaches along the Pacific coast of northwestern Costa Rica.Kernel density analysis indicated that turtles spent most of their time in a particularly small area in the vicinity of the nesting beaches(50%utilization distribution was an area of 3 km^(2)).Minimum daily distance traveled during a 12 day internesting period was 4.6±3.5 km.Dives were short and primarily occupied the upper 10 m of the water column.Turtles spent most of their time resting at the surface and conducting U-dives(ranging from 60 to 81%of the total tracking time involved in those activities).Turtles showed a strong diel pattern,U-dives mainly took place during the day and turtles spent a large amount of time resting at the surface at night.The lack of long-distance movements demonstrated that this area was heavily utilized by turtles during the nesting season and,therefore,was a crucial location for conservation of this highly endangered green turtle population.The unique behavior of these turtles in resting at the surface at night might make them particularly vulnerable to fishing activities near the nesting beaches. 展开更多
关键词 chelonia mydas Costa Rica East Pacific green turtle internesting period satellite telemetry
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绿海龟消化道组织学观察 被引量:4
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作者 甘文强 张晓雁 +5 位作者 乔健 丁天健 尹菲 李星寓 赵炜 周向梅 《中国兽医杂志》 CAS 北大核心 2011年第11期23-25,I0001,共4页
通过常规组织学切片方法,对绿海龟的消化道进行组织学观察。结果发现除口腔和泄殖腔外,消化道均由黏膜层、黏膜下层、肌层和外膜层组成。消化道各段的结构差异主要集中在黏膜层和肌层。其中食管黏膜存在特殊的高度角化倒齿结构,而非常... 通过常规组织学切片方法,对绿海龟的消化道进行组织学观察。结果发现除口腔和泄殖腔外,消化道均由黏膜层、黏膜下层、肌层和外膜层组成。消化道各段的结构差异主要集中在黏膜层和肌层。其中食管黏膜存在特殊的高度角化倒齿结构,而非常见的皱襞,且食管黏膜层下有较发达的纵行骨骼肌。食道的黏膜上皮为复层扁平上皮,胃、小肠和大肠均为单层柱状上皮。除食管外,消化道各段的肌层均由内环外纵的平滑肌组成,且环形肌均较纵行肌发达。肠道各段黏膜固有层中均有见弥散的淋巴组织。 展开更多
关键词 绿海龟 消化道 组织结构
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玳瑁和绿海龟幼体外周血细胞的观察与比较 被引量:5
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作者 张飞燕 古河祥 +2 位作者 陈华灵 夏中荣 李丕鹏 《动物学杂志》 CAS CSCD 北大核心 2009年第6期113-121,共9页
对玳瑁(Eretmochelys imbricata)和绿海龟(Chelonia mydas)外周血细胞形态特征及其数量进行了观察、测定与比较。结果表明,在2种海龟外周血都观察到7种血细胞:红细胞、淋巴细胞、单核细胞、嗜中性粒细胞、嗜酸性粒细胞、嗜碱性粒细胞和... 对玳瑁(Eretmochelys imbricata)和绿海龟(Chelonia mydas)外周血细胞形态特征及其数量进行了观察、测定与比较。结果表明,在2种海龟外周血都观察到7种血细胞:红细胞、淋巴细胞、单核细胞、嗜中性粒细胞、嗜酸性粒细胞、嗜碱性粒细胞和血栓细胞,除了绿海龟观察到大、小2种嗜酸性粒细胞外,另外几种血细胞的形态结构与其他爬行动物相似。白细胞分类计数表明,2种海龟白细胞中以嗜中性粒细胞数量最多,其次是淋巴细胞和单核细胞,嗜酸性粒细胞仅有少数,嗜碱性粒细胞极少,并且此类细胞在玳瑁的白细胞分类计数中为零。玳瑁红细胞数量为(346.7±68.4)×103个/μl,比绿海龟红细胞含量少,绿海龟为(403.3±170.6)×103个/μl;玳瑁白细胞及血栓细胞数分别为(7.7±1.9)×103个/μl和(9.6±2.2)×103个/μl,绿海龟分别为(7.3±2.8)×103个/μl和(7.5±3.7)×103个/μl。 展开更多
关键词 玳瑁 绿海龟 血细胞
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圈养绿海龟的筑巢行为和巢址选择特征 被引量:3
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作者 陈华灵 叶明彬 +2 位作者 李满文 观玉安 李丕鹏 《野生动物学报》 北大核心 2021年第4期951-957,共7页
绿海龟(Chelonia mydas)是国际濒危物种,为我国一级保护野生动物,巢址的选择对绿海龟繁衍后代极为关键,研究筑巢行为可为其种群恢复及保护提供必要的科学依据。目前,国内外对绿海龟巢址选择的研究并不多见,也不全面,仍有许多未知之处,... 绿海龟(Chelonia mydas)是国际濒危物种,为我国一级保护野生动物,巢址的选择对绿海龟繁衍后代极为关键,研究筑巢行为可为其种群恢复及保护提供必要的科学依据。目前,国内外对绿海龟巢址选择的研究并不多见,也不全面,仍有许多未知之处,如沙滩树木对产卵的影响等。由于我国野外上岸产卵的绿海龟极度稀少,很难通过野外种群深入了解它们的筑巢行为,故2019—2020年间,采用红外线视频监控技术研究了11只人工养殖的雌性绿海龟的119次筑巢行为,发现96%筑巢位置位于树木区,仅有4%出现在裸沙区;树木区中80%筑巢及88%产卵行为均集中在隐蔽区域,说明绿海龟明显偏好于植被下产卵,尤其喜好温度、湿度和隐蔽性相对较好的区域。此外,绿海龟每次产卵通常会经多次上岸、多次筑巢以寻找合适产卵点,另约有25%的产卵点是它们的弃址,皆揭示绿海龟对巢址具有选择能力。 展开更多
关键词 绿海龟 产卵偏好 产卵位置选择 筑巢环境
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绿海龟稚龟性别鉴定及临界温度 被引量:4
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作者 古河祥 夏中荣 +5 位作者 李丕鹏 端金霞 叶明彬 张飞燕 陈华灵 林日锦 《动物学杂志》 CAS CSCD 北大核心 2010年第4期81-88,共8页
通过组织形态学鉴定、羊水和血液中性激素测定等手段,对惠东港口海龟保护区不同恒温下孵化的绿海龟(Chelonia mydas)进行研究,寻求绿海龟稚龟性别鉴定的最佳方法。结果显示,(1)组织形态学,绿海龟性腺切片分皮层和髓质两部分,卵巢的皮层... 通过组织形态学鉴定、羊水和血液中性激素测定等手段,对惠东港口海龟保护区不同恒温下孵化的绿海龟(Chelonia mydas)进行研究,寻求绿海龟稚龟性别鉴定的最佳方法。结果显示,(1)组织形态学,绿海龟性腺切片分皮层和髓质两部分,卵巢的皮层较厚、基质中有大小不一的未成熟卵细胞,髓质中空腔较少;睾丸的皮层较薄,髓质中空腔较多,呈现出显著的被基质包围的髓质索。(2)性激素测定,当雌二醇与睾酮含量之比E2∶T<1.5时,孵出的稚龟为雄性(♂);当E2∶T>1.5时,为雌性(♀)。(3)绿海龟性别决定的临界温度在29.4~29.5℃之间,此时孵出稚龟的性比约为1∶1。本文还讨论了各种不同性别鉴定方法的优劣和时期选择。 展开更多
关键词 绿海龟 临界温度(PT) 温度依赖型性别决定(TSD)
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