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
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,...
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2018
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| Acceso en línea: | https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_07224060_v41_n9_p1751_Dopchiz http://hdl.handle.net/20.500.12110/paper_07224060_v41_n9_p1751_Dopchiz |
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paper:paper_07224060_v41_n9_p1751_Dopchiz2023-06-08T15:43:41Z 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 Gametogenesis Internal fertilization Meiosis Nacella concinna chromosome fertilization (reproduction) gametogenesis gastropod histology morphology reproduction sex determination sexual maturity spawning sperm trophic interaction Antarctic Peninsula Antarctica King George Island Potter Cove South Shetland Islands West Antarctica Docoglossa Gastropoda Nacella Nacella concinna Nacellidae Patellidae 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. © 2018, Springer-Verlag GmbH Germany, part of Springer Nature. 2018 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_07224060_v41_n9_p1751_Dopchiz http://hdl.handle.net/20.500.12110/paper_07224060_v41_n9_p1751_Dopchiz |
| institution |
Universidad de Buenos Aires |
| institution_str |
I-28 |
| repository_str |
R-134 |
| collection |
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) |
| topic |
Gametogenesis Internal fertilization Meiosis Nacella concinna chromosome fertilization (reproduction) gametogenesis gastropod histology morphology reproduction sex determination sexual maturity spawning sperm trophic interaction Antarctic Peninsula Antarctica King George Island Potter Cove South Shetland Islands West Antarctica Docoglossa Gastropoda Nacella Nacella concinna Nacellidae Patellidae |
| spellingShingle |
Gametogenesis Internal fertilization Meiosis Nacella concinna chromosome fertilization (reproduction) gametogenesis gastropod histology morphology reproduction sex determination sexual maturity spawning sperm trophic interaction Antarctic Peninsula Antarctica King George Island Potter Cove South Shetland Islands West Antarctica Docoglossa Gastropoda Nacella Nacella concinna Nacellidae Patellidae 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 |
| topic_facet |
Gametogenesis Internal fertilization Meiosis Nacella concinna chromosome fertilization (reproduction) gametogenesis gastropod histology morphology reproduction sex determination sexual maturity spawning sperm trophic interaction Antarctic Peninsula Antarctica King George Island Potter Cove South Shetland Islands West Antarctica Docoglossa Gastropoda Nacella Nacella concinna Nacellidae Patellidae |
| description |
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. © 2018, Springer-Verlag GmbH Germany, part of Springer Nature. |
| title |
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 |
| title_short |
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 |
| title_full |
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 |
| title_fullStr |
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 |
| title_full_unstemmed |
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 |
| title_sort |
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 |
| publishDate |
2018 |
| url |
https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_07224060_v41_n9_p1751_Dopchiz http://hdl.handle.net/20.500.12110/paper_07224060_v41_n9_p1751_Dopchiz |
| _version_ |
1768542223503196160 |