Reproductive biology of the angular angel shark Squatina guggenheim (Chondrichthyes: Squatinidae) off Patagonia (Argentina, southwestern Atlantic)

The reproductive biology of the angel shark Squatina guggenheim was described based on 584 animals sampled in the San Matías Gulf, Argentina, between January and December 1996. Both sexes of S. guggenheim reached similar total length and matured at similar sizes (between 73 and 76 cm total length)....

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Autores principales: Awruch, C.A., Nostro, F.L.L., Somoza, G.M., Di Giácomo, E.
Formato: JOUR
Materias:
Chondrichthyes
Patagonia
Reproductive biology
Southwestern Atlantic
Squatina guggenheim
Squatinidae
reproductive behavior
reproductive biology
shark
size distribution
Atlantic Ocean
San Matias Gulf
South America
Animalia
Squatina argentina
Acceso en línea:http://hdl.handle.net/20.500.12110/paper_01853880_v34_n1_p17_Awruch
Aporte de:
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
id todo:paper_01853880_v34_n1_p17_Awruch
record_format dspace
spelling todo:paper_01853880_v34_n1_p17_Awruch2023-10-03T15:08:40Z Reproductive biology of the angular angel shark Squatina guggenheim (Chondrichthyes: Squatinidae) off Patagonia (Argentina, southwestern Atlantic) Awruch, C.A. Nostro, F.L.L. Somoza, G.M. Di Giácomo, E. Chondrichthyes Patagonia Reproductive biology Southwestern Atlantic Squatina guggenheim Squatinidae reproductive behavior reproductive biology shark size distribution Atlantic Ocean Patagonia San Matias Gulf South America Animalia Chondrichthyes Squatina argentina Squatinidae The reproductive biology of the angel shark Squatina guggenheim was described based on 584 animals sampled in the San Matías Gulf, Argentina, between January and December 1996. Both sexes of S. guggenheim reached similar total length and matured at similar sizes (between 73 and 76 cm total length). In males, testes were paired and showed diametric development. Adult males were predominant in the austral autumn and winter, and were capable of mating all year round. In females, only the left ovary was functional. The maximum follicular diameter recorded (6 cm) was observed during the austral autumn and winter, with ovulation occurring during spring and summer. The size distribution of the follicles indicated that adult females presented different maturational stages in all the seasons. No post-ovulatory follicles were distinguished in any of the females examined. The seasonal analysis showed significant differences in sex abundance. Adult males were predominant in autumn and winter, juvenile males in spring, and adult females in summer. Only a few pregnant animals were caught in January, May and September. The results suggest that S. guggenheim females show a biannual reproductive cycle with gestation taking at least one year, and that the San Matias Gulf is not one of their main breeding areas. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_01853880_v34_n1_p17_Awruch
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic Chondrichthyes
Patagonia
Reproductive biology
Southwestern Atlantic
Squatina guggenheim
Squatinidae
reproductive behavior
reproductive biology
shark
size distribution
Atlantic Ocean
Patagonia
San Matias Gulf
South America
Animalia
Chondrichthyes
Squatina argentina
Squatinidae
spellingShingle Chondrichthyes
Patagonia
Reproductive biology
Southwestern Atlantic
Squatina guggenheim
Squatinidae
reproductive behavior
reproductive biology
shark
size distribution
Atlantic Ocean
Patagonia
San Matias Gulf
South America
Animalia
Chondrichthyes
Squatina argentina
Squatinidae
Awruch, C.A.
Nostro, F.L.L.
Somoza, G.M.
Di Giácomo, E.
Reproductive biology of the angular angel shark Squatina guggenheim (Chondrichthyes: Squatinidae) off Patagonia (Argentina, southwestern Atlantic)
topic_facet Chondrichthyes
Patagonia
Reproductive biology
Southwestern Atlantic
Squatina guggenheim
Squatinidae
reproductive behavior
reproductive biology
shark
size distribution
Atlantic Ocean
Patagonia
San Matias Gulf
South America
Animalia
Chondrichthyes
Squatina argentina
Squatinidae
description The reproductive biology of the angel shark Squatina guggenheim was described based on 584 animals sampled in the San Matías Gulf, Argentina, between January and December 1996. Both sexes of S. guggenheim reached similar total length and matured at similar sizes (between 73 and 76 cm total length). In males, testes were paired and showed diametric development. Adult males were predominant in the austral autumn and winter, and were capable of mating all year round. In females, only the left ovary was functional. The maximum follicular diameter recorded (6 cm) was observed during the austral autumn and winter, with ovulation occurring during spring and summer. The size distribution of the follicles indicated that adult females presented different maturational stages in all the seasons. No post-ovulatory follicles were distinguished in any of the females examined. The seasonal analysis showed significant differences in sex abundance. Adult males were predominant in autumn and winter, juvenile males in spring, and adult females in summer. Only a few pregnant animals were caught in January, May and September. The results suggest that S. guggenheim females show a biannual reproductive cycle with gestation taking at least one year, and that the San Matias Gulf is not one of their main breeding areas.
format JOUR
author Awruch, C.A.
Nostro, F.L.L.
Somoza, G.M.
Di Giácomo, E.
author_facet Awruch, C.A.
Nostro, F.L.L.
Somoza, G.M.
Di Giácomo, E.
author_sort Awruch, C.A.
title Reproductive biology of the angular angel shark Squatina guggenheim (Chondrichthyes: Squatinidae) off Patagonia (Argentina, southwestern Atlantic)
title_short Reproductive biology of the angular angel shark Squatina guggenheim (Chondrichthyes: Squatinidae) off Patagonia (Argentina, southwestern Atlantic)
title_full Reproductive biology of the angular angel shark Squatina guggenheim (Chondrichthyes: Squatinidae) off Patagonia (Argentina, southwestern Atlantic)
title_fullStr Reproductive biology of the angular angel shark Squatina guggenheim (Chondrichthyes: Squatinidae) off Patagonia (Argentina, southwestern Atlantic)
title_full_unstemmed Reproductive biology of the angular angel shark Squatina guggenheim (Chondrichthyes: Squatinidae) off Patagonia (Argentina, southwestern Atlantic)
title_sort reproductive biology of the angular angel shark squatina guggenheim (chondrichthyes: squatinidae) off patagonia (argentina, southwestern atlantic)
url http://hdl.handle.net/20.500.12110/paper_01853880_v34_n1_p17_Awruch
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