Reproductive biology and energetics of the brooding sea star Anasterias antarctica (Echinodermata: Asteroidea) in the Beagle Channel, Tierra del Fuego, Argentina
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Universidad de Costa Rica
2017
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| Acceso en línea: | https://revistas.ucr.ac.cr/index.php/rbt/article/view/31690 |
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RBT316902022-06-09T18:10:56Z Reproductive biology and energetics of the brooding sea star Anasterias antarctica (Echinodermata: Asteroidea) in the Beagle Channel, Tierra del Fuego, Argentina Pérez, Analía F. Fraysse, Cintia Boy, Claudia C. Epherra, Lucia Javier, Calcagno brooding sea star gonad pyloric caeca reserve organ endoparasite. The brooding sea star Anasterias antarctica is distributed from the coast of Patagonia to the northern Peninsula of Antarctica. In the Beagle Channel, the females of A. antarctica brood their eggs for seven months and do not feed during this period. The endoparasite Dendrogaster argentinensis (Crustacea: Ascothoracica) causes castration in several species of Anasterias. We randomly collected four samplings of adults in May, August and October (brooding period) and January (non-brooding period). The gonad (GI) and pyloric caeca index (PCI) were calculated as organ wet weight (g) x 100/total wet weight (g). Each individual was sexed by microscopic examination of the gonads. Sex ratio, brooding females/non-brooding females and mature females/non-mature females ratios was 1:1. The male GI reached maximum values in January, when most individuals were sexually mature. The GI of non-brooding females reached its maximum during October when it was significantly higher than those from brooding females. The PCI was minimum in October, being lower in brooding females (August and October). During the non-brooding period, mature females had a significantly higher GI than non-mature females. The PCI did not vary neither between males, nor between mature and non mature females. By the end of the brooding period, non-brooding females showed a higher GI than the brooding females. This is explained by proliferation and increase of the oocytes size of non-brooding females. Mature females showed an incremented GI with presence of mature oocytes, while non-mature females exhibited more abundance of previtelogenic oocytes. Males showed synchronicity in reproductive condition. The females that have not brooded presented a process of active gametogenesis, reaching the summer with a high GI, therefore becoming mature females. Females that had brooded were probably lacking energy for new gonadal maturation. The pyloric caeca would be performing the role of a reserve organ in the brooding females, decreasing its size during the brooding period. Prevalence of D. argentinensis in A. antarctica was 11.06%. As this parasite was recorded in sea stars lacking gonads, these infected hosts could have been castrated. Rev. Biol. Trop. 65(Suppl. 1): S221-S232. Epub 2017 November 01. Universidad de Costa Rica 2017-11-01 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Article application/pdf text/html https://revistas.ucr.ac.cr/index.php/rbt/article/view/31690 10.15517/rbt.v65i1-1.31690 Revista de Biología Tropical; Vol. 65 No. S1 (2017): Volume 65 – Supplement 1 – November 2017: Research on Echinoderms in Latin America IV; S221–S232 Revista de Biología Tropical; Vol. 65 Núm. S1 (2017): Volumen 65 – Suplemento 1 – Noviembre 2017: Estudios Latinoamericanos en Equinodermos IV; S221–S232 Revista Biología Tropical; Vol. 65 N.º S1 (2017): Volume 65 – Supplement 1 – November 2017: Research on Echinoderms in Latin America IV; S221–S232 2215-2075 0034-7744 10.15517/rbt.v65i1-1 eng https://revistas.ucr.ac.cr/index.php/rbt/article/view/31690/31336 https://revistas.ucr.ac.cr/index.php/rbt/article/view/31690/31367 Copyright (c) 2017 Revista de Biología Tropical http://creativecommons.org/licenses/by/4.0 |
| institution |
Universidad de Costa Rica |
| collection |
Revista de Biología Tropical |
| language |
eng |
| format |
Online |
| author |
Pérez, Analía F. Fraysse, Cintia Boy, Claudia C. Epherra, Lucia Javier, Calcagno |
| spellingShingle |
Pérez, Analía F. Fraysse, Cintia Boy, Claudia C. Epherra, Lucia Javier, Calcagno Reproductive biology and energetics of the brooding sea star Anasterias antarctica (Echinodermata: Asteroidea) in the Beagle Channel, Tierra del Fuego, Argentina |
| author_facet |
Pérez, Analía F. Fraysse, Cintia Boy, Claudia C. Epherra, Lucia Javier, Calcagno |
| author_sort |
Pérez, Analía F. |
| title |
Reproductive biology and energetics of the brooding sea star Anasterias antarctica (Echinodermata: Asteroidea) in the Beagle Channel, Tierra del Fuego, Argentina |
| title_short |
Reproductive biology and energetics of the brooding sea star Anasterias antarctica (Echinodermata: Asteroidea) in the Beagle Channel, Tierra del Fuego, Argentina |
| title_full |
Reproductive biology and energetics of the brooding sea star Anasterias antarctica (Echinodermata: Asteroidea) in the Beagle Channel, Tierra del Fuego, Argentina |
| title_fullStr |
Reproductive biology and energetics of the brooding sea star Anasterias antarctica (Echinodermata: Asteroidea) in the Beagle Channel, Tierra del Fuego, Argentina |
| title_full_unstemmed |
Reproductive biology and energetics of the brooding sea star Anasterias antarctica (Echinodermata: Asteroidea) in the Beagle Channel, Tierra del Fuego, Argentina |
| title_sort |
reproductive biology and energetics of the brooding sea star anasterias antarctica (echinodermata: asteroidea) in the beagle channel, tierra del fuego, argentina |
| publisher |
Universidad de Costa Rica |
| publishDate |
2017 |
| url |
https://revistas.ucr.ac.cr/index.php/rbt/article/view/31690 |
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1810115204211539968 |