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Abstract:

Fritillaria borealis is a cosmopolitan species, very frequent in sub-antarctic and antarctic waters. The objective of this paper was to analyze its size structure and maturity stages at two sites in Ushuaia Bay: a coastal site exposed to anthropogenic pressure (E1) and a reference site (E2) located in the external zone of the bay. Zooplankton was collected during the 2012 seasonal cycle. The sampling method involved the use of a 67 μm-mesh net. Appendicularians were classified in four maturity stages: I) undifferentiated gonads, II) testis and ovary differentiated, III) expanded testis, IV) discharged testis, expanded ovary. Our results showed that the highest densities of F. borealis occurred in spring and summer at both sites; coinciding with high values of chlorophyll-a. The percentage of juveniles (I and II) exhibited a spatial and temporal pattern similar to that observed for chlorophyll-a values. During spring-summer, juveniles and mature specimens (III and IV) showed a greater gonadal development than those individuals found in autumn-winter. In conclusion, the mismatching in the population structure and the pattern of densities of F. borealis between coastal and external zones would suggest the existence of two sub-populations susceptible to the influence of the anthropogenic impact in the bay. © 2015, Universidade de Sao Paulo. All Rights Reserved.

Registro:

Documento: Artículo
Título:Population structure and maturity stages of fritillaria borealis (appendicularia, tunicata): Seasonal cycle in Ushuaia Bay (Beagle Channel)
Autor:Presta, M.L.; Hoffmeyer, M.S.; Capitanio, F.L.
Filiación:Instituto de Biodiversidad y Biología Experimental y Aplicada, Consejo Nacional de Investigaciones Científicas y Técnicas, Universidad de Buenos Aires (IBBEA, CONICET - UBA), Intendente Güiraldes 2160, Ciudad UniversitariaC1428EG, Argentina
Instituto Argentino de Oceanografía, Consejo Nacional de Investigaciones Científicas y Técnicas, Universidad Nacional del Sur (IADO, CONICET - UNS), Camino La Carrindanga Km 7,5, Bahía Blanca, B8000FWB, Argentina
Palabras clave:Appendicularians; Beagle channel; Maturity stages
Año:2015
Volumen:63
Número:3
Página de inicio:279
Página de fin:288
DOI: http://dx.doi.org/10.1590/S1679-87592015087206303
Título revista:Brazilian Journal of Oceanography
Título revista abreviado:Braz. J. Oceanogr.
ISSN:16798759
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_16798759_v63_n3_p279_Presta

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Citas:

---------- APA ----------
Presta, M.L., Hoffmeyer, M.S. & Capitanio, F.L. (2015) . Population structure and maturity stages of fritillaria borealis (appendicularia, tunicata): Seasonal cycle in Ushuaia Bay (Beagle Channel). Brazilian Journal of Oceanography, 63(3), 279-288.
http://dx.doi.org/10.1590/S1679-87592015087206303
---------- CHICAGO ----------
Presta, M.L., Hoffmeyer, M.S., Capitanio, F.L. "Population structure and maturity stages of fritillaria borealis (appendicularia, tunicata): Seasonal cycle in Ushuaia Bay (Beagle Channel)" . Brazilian Journal of Oceanography 63, no. 3 (2015) : 279-288.
http://dx.doi.org/10.1590/S1679-87592015087206303
---------- MLA ----------
Presta, M.L., Hoffmeyer, M.S., Capitanio, F.L. "Population structure and maturity stages of fritillaria borealis (appendicularia, tunicata): Seasonal cycle in Ushuaia Bay (Beagle Channel)" . Brazilian Journal of Oceanography, vol. 63, no. 3, 2015, pp. 279-288.
http://dx.doi.org/10.1590/S1679-87592015087206303
---------- VANCOUVER ----------
Presta, M.L., Hoffmeyer, M.S., Capitanio, F.L. Population structure and maturity stages of fritillaria borealis (appendicularia, tunicata): Seasonal cycle in Ushuaia Bay (Beagle Channel). Braz. J. Oceanogr. 2015;63(3):279-288.
http://dx.doi.org/10.1590/S1679-87592015087206303