Hermaphroditism and preliminary reproductive study ofHermaphroditism and preliminary reproductive study of the sea-urchin, Pseudechinus magellanicus, in the Beagle Channel (Tierra del Fuego, Argentina)
Palabras clave:
reproductive cycle, ovotesti, echinoderms, gonads, subantarcticResumen
The sea urchin Pseudechinus magellanicus, abundant in the Beagle Channel, plays a crucial role in the benthic ecosystem. This study presents the first documented records of hermaphrodites of P. magellanicus in the Beagle Channel and provides updated insights into its reproductive dynamics in the studied population. Monthly samplings (30 adult individuals each) were conducted between July and September 2023, assessing sex and reproductive stage through histological analysis. A total of 90 individuals were examined, 45 identified as male, 39 as female, and 6 as hermaphrodites. Excluding hermaphrodites, the sex ratio was 1:1, and the hermaphroditism incidence was 6.67%. The hermaphrodites were found in pre-mature II, mature, or partially spawned stages. Various types of hermaphrodites were identified, including three hermaphrodites with male predominantly characteristics, one with predominantly female characteristics, and two ovotestes. Hermaphrodite gonads were classified based on the presence and distribution of female and male germ cells within the same or different acini. While these findings provide valuable insights into the reproductive biology of P. magellanicus in the Beagle Channel, the underlying factors of the observed cases of hermaphroditism remain speculative and require further research to assess potential environmental influences and their implications.
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