• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Polar biology >Gonadal histology and gametogenesis of the Antarctic limpet Nacella concinna (Patellogastropoda, Nacellidae) collected at Potter Cove, 25 de Mayo (King George) Island, during austral summer
【24h】

Gonadal histology and gametogenesis of the Antarctic limpet Nacella concinna (Patellogastropoda, Nacellidae) collected at Potter Cove, 25 de Mayo (King George) Island, during austral summer

机译：南极帽贝Nacella concinna（Patellogastropoda，Nacellidae）的性腺组织学和配子发生在南半球夏季，在德梅奥25（乔治国王）岛的Potter Cove采集。

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

The limpet Nacella concinna is one of the most widely distributed gastropods along the Antarctic Peninsula. This species has been a useful tool in ecological and physiological studies for understanding Antarctic trophic interactions. Although the reproduction of limpets has been thoroughly studied, very little is known about gametogenesis in the genus Nacella . The purpose of this study is to describe the gonadal morphology and gametogenesis in N. concinna observed by light microscopy and to determine its chromosome complement. All the limpets were sexually mature at the time of sampling. Oocytes were separated by trabeculae with abundant glycogen reserves. There was a predominance of late vitellogenic oocytes. Many previtellogenic oocytes were pyriform in shape. Oogonia were clustered near the ovary wall or the trabeculae. Only two meiotic stages were found: metaphase I and anaphase I, both of which showed a regular arrangement of chromosomes. The oviduct contained mature oocytes surrounded by sperm. Testicular tubules were filled with spermatozoa. The elongated head of the spermatozoon resembles that of other Nacellidae members. One of the bivalents is heteropycnotic. The haploid complement is n  = 4 and the sex determination system is XO/XX. Although N. concinna has been commonly characterized as a broadcast-spawner, its unique spawning behavior, the presence of oocytes at anaphase I and spermatozoa within the oviduct suggests internal fertilization.
机译：帽贝鼻虫是沿南极半岛分布最广泛的腹足动物之一。该物种已成为了解南极营养相互作用的生态和生理研究的有用工具。尽管对帽贝的繁殖已进行了深入研究，但对机舱属的配子发生知之甚少。这项研究的目的是描述通过光学显微镜观察到的猪笼草的性腺形态和配子发生，并确定其染色体互补性。采样时，所有的帽贝都已性成熟。卵母细胞被小梁分离，糖原储备丰富。晚期卵黄母细胞占主导地位。许多玻璃体前卵母细胞呈梨状。 Oogonia聚集在子房壁或小梁附近。仅发现了两个减数分裂阶段：中期I和后期I，它们均显示染色体的规则排列。输卵管包含被精子包围的成熟卵母细胞。睾丸小管充满了精子。精子的细长头类似于其他短尾科的成员。二价之一是异养的。单倍体补体为n = 4，性别决定系统为XO / XX。虽然conconinna猪笼草通常被认为是繁殖产卵动物，但它具有独特的产卵行为，但在输卵管中后期I和精子中卵母细胞的存在提示内部受精。

著录项

  • 来源
    《Polar biology》 |2018年第9期|1751-1762|共12页
  • 作者

    Laura P. Dopchiz; Martín Ansaldo; Griselda Genovese;

  • 作者单位

    Laboratorio de Ecofisiología y Ecotoxicología, Instituto Antártico Argentino;

    Laboratorio de Ecofisiología y Ecotoxicología, Instituto Antártico Argentino;

    Universidad de Buenos Aires, Facultad de Ciencias Exactas y Naturales, Departamento de Biodiversidad y Biología Experimental, Laboratorio de Ecotoxicología Acuática, CONICET – IBBEA;

  • 收录信息
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Nacella concinna; Gametogenesis; Internal fertilization; Meiosis;

    机译：吊舱;配子发生;内部受精;减数分裂;

相似文献

  • 外文文献
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号