Gonadal development, allometric growth and ecological impact of Appendicularia sicula (Appendicularia: Fritillariidae) from the south-western Atlantic Ocean

The gonadal development and morphometry of Appendicularia sicula (Appendicularia: Fritillariidae) were studied by means of histological sections and from the measurement of several characters. Based on morphometric measurements, the ingestion and clearance rates and the percentages of consumed chlor...

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Autores principales: Aguirre, G.E., Capitanio, F.L., Viñas, M.D., Esnal, G.B.
Formato: JOUR
Materias:
accumulation rate
allometry
autotrophy
chlorophyll a
clearance rate
developmental stage
ecological impact
histology
ingestion rate
measurement method
morphometry
plankton
sexual maturity
Atlantic Ocean
Atlantic Ocean (Southwest)
Appendicularia sicula
Fritillaria (appendicularian)
Fritillaria pellucida
Fritillariidae
Acceso en línea:http://hdl.handle.net/20.500.12110/paper_00253154_v86_n5_p1215_Aguirre
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Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
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spelling todo:paper_00253154_v86_n5_p1215_Aguirre2023-10-03T14:35:41Z Gonadal development, allometric growth and ecological impact of Appendicularia sicula (Appendicularia: Fritillariidae) from the south-western Atlantic Ocean Aguirre, G.E. Capitanio, F.L. Viñas, M.D. Esnal, G.B. accumulation rate allometry autotrophy chlorophyll a clearance rate developmental stage ecological impact histology ingestion rate measurement method morphometry plankton sexual maturity Atlantic Ocean Atlantic Ocean (Southwest) Appendicularia sicula Fritillaria (appendicularian) Fritillaria pellucida Fritillariidae The gonadal development and morphometry of Appendicularia sicula (Appendicularia: Fritillariidae) were studied by means of histological sections and from the measurement of several characters. Based on morphometric measurements, the ingestion and clearance rates and the percentages of consumed chlorophyll-a were also estimated. The gonadal development is similar to that of Fritillaria pellucida. A small dorsal ovotestis, which originates ovary and testicle, shows large somatic nuclei inside. In the ovary these somatic nuclei are surrounded by a single layer of germ cells nuclei, whereas in the testicle they are found between the small nuclei of the germ cells. As the development proceeds, the large somatic nuclei are resorbed in both gonads, and the testicle finally envelopes the ovary posteriorly. After spermatozoids emission, the rectum is shown occupying most of the body volume. The length of the rectum shows a positive allometric growth in respect to the length of the trunk, which can be ascribed to its continuous accumulation of matter due to the lack of an anus. The relationship obtained between trunk length (TL, μm) and dry weight (DW, μg) was DW=2.24×10-11 TL4.098. Applying this equation, a two-fold increase in length would correspond to a 42-fold weight increase. For specimens with an advanced sexual maturity (400-450 μm TL), we estimated a mean autotrophic ingestion rate of 0.17 μg C ind-1 d-1 and a mean clearance rate of 5.01 ml ind-1 d -1. The percentage of total chlorophyll-a consumed by the A. sicula population was 5.13%. This value is similar to those reported for other appendicularian species in different temperate seas. Fil:Aguirre, G.E. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Capitanio, F.L. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Esnal, G.B. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_00253154_v86_n5_p1215_Aguirre
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic accumulation rate
allometry
autotrophy
chlorophyll a
clearance rate
developmental stage
ecological impact
histology
ingestion rate
measurement method
morphometry
plankton
sexual maturity
Atlantic Ocean
Atlantic Ocean (Southwest)
Appendicularia sicula
Fritillaria (appendicularian)
Fritillaria pellucida
Fritillariidae
spellingShingle accumulation rate
allometry
autotrophy
chlorophyll a
clearance rate
developmental stage
ecological impact
histology
ingestion rate
measurement method
morphometry
plankton
sexual maturity
Atlantic Ocean
Atlantic Ocean (Southwest)
Appendicularia sicula
Fritillaria (appendicularian)
Fritillaria pellucida
Fritillariidae
Aguirre, G.E.
Capitanio, F.L.
Viñas, M.D.
Esnal, G.B.
Gonadal development, allometric growth and ecological impact of Appendicularia sicula (Appendicularia: Fritillariidae) from the south-western Atlantic Ocean
topic_facet accumulation rate
allometry
autotrophy
chlorophyll a
clearance rate
developmental stage
ecological impact
histology
ingestion rate
measurement method
morphometry
plankton
sexual maturity
Atlantic Ocean
Atlantic Ocean (Southwest)
Appendicularia sicula
Fritillaria (appendicularian)
Fritillaria pellucida
Fritillariidae
description The gonadal development and morphometry of Appendicularia sicula (Appendicularia: Fritillariidae) were studied by means of histological sections and from the measurement of several characters. Based on morphometric measurements, the ingestion and clearance rates and the percentages of consumed chlorophyll-a were also estimated. The gonadal development is similar to that of Fritillaria pellucida. A small dorsal ovotestis, which originates ovary and testicle, shows large somatic nuclei inside. In the ovary these somatic nuclei are surrounded by a single layer of germ cells nuclei, whereas in the testicle they are found between the small nuclei of the germ cells. As the development proceeds, the large somatic nuclei are resorbed in both gonads, and the testicle finally envelopes the ovary posteriorly. After spermatozoids emission, the rectum is shown occupying most of the body volume. The length of the rectum shows a positive allometric growth in respect to the length of the trunk, which can be ascribed to its continuous accumulation of matter due to the lack of an anus. The relationship obtained between trunk length (TL, μm) and dry weight (DW, μg) was DW=2.24×10-11 TL4.098. Applying this equation, a two-fold increase in length would correspond to a 42-fold weight increase. For specimens with an advanced sexual maturity (400-450 μm TL), we estimated a mean autotrophic ingestion rate of 0.17 μg C ind-1 d-1 and a mean clearance rate of 5.01 ml ind-1 d -1. The percentage of total chlorophyll-a consumed by the A. sicula population was 5.13%. This value is similar to those reported for other appendicularian species in different temperate seas.
format JOUR
author Aguirre, G.E.
Capitanio, F.L.
Viñas, M.D.
Esnal, G.B.
author_facet Aguirre, G.E.
Capitanio, F.L.
Viñas, M.D.
Esnal, G.B.
author_sort Aguirre, G.E.
title Gonadal development, allometric growth and ecological impact of Appendicularia sicula (Appendicularia: Fritillariidae) from the south-western Atlantic Ocean
title_short Gonadal development, allometric growth and ecological impact of Appendicularia sicula (Appendicularia: Fritillariidae) from the south-western Atlantic Ocean
title_full Gonadal development, allometric growth and ecological impact of Appendicularia sicula (Appendicularia: Fritillariidae) from the south-western Atlantic Ocean
title_fullStr Gonadal development, allometric growth and ecological impact of Appendicularia sicula (Appendicularia: Fritillariidae) from the south-western Atlantic Ocean
title_full_unstemmed Gonadal development, allometric growth and ecological impact of Appendicularia sicula (Appendicularia: Fritillariidae) from the south-western Atlantic Ocean
title_sort gonadal development, allometric growth and ecological impact of appendicularia sicula (appendicularia: fritillariidae) from the south-western atlantic ocean
url http://hdl.handle.net/20.500.12110/paper_00253154_v86_n5_p1215_Aguirre
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AT vinasmd gonadaldevelopmentallometricgrowthandecologicalimpactofappendiculariasiculaappendiculariafritillariidaefromthesouthwesternatlanticocean
AT esnalgb gonadaldevelopmentallometricgrowthandecologicalimpactofappendiculariasiculaappendiculariafritillariidaefromthesouthwesternatlanticocean
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