Ciclo gonadal del chorito Mytilus chilensis (Bivalvia: Mytilidae) en dos localidades del sur de Chile

Pablo A. Oyarzún, Jorge E. Toro, Roberto Jaramillo, Ricardo Guiñez, Carolina Briones, Marcela Astorga

Resultado de la investigación: Article

13 Citas (Scopus)

Resumen

A qualitative and quantitative analysis was carried out of the gonadal cycle of the bivalve Mytilus chilensis from Chaihuín and Yal bay, southern Chile, between October 2007 and June 2008. Four gametogenic stages were determined using histological analysis of the gonads, and quantitative estimates were made of the Gametic Volume Fraction (VFG), percentage of inter follicular connective tissue, and the Gonadosomatic Index (IG). The quantitative analysis (VFG) was the best indicator of spawning. Two spawning events, one in October and one in March, were observed simultaneously in both sexes of mussels from Chaihuín. However, for specimens from bahía Yal, four spawning events were registered, principally from March to June (autumn), when the water temperature decreased. The relationship between the IG and the gametogenic stages was very low, as was that between the IG and the percentage of mature oocytes. Therefore, the IG is not a good indicator of spawning in this species. A re-evaluation of the ban period established for Mytilus chilensis (1 November to 31 December) is suggested since most individuals from the populations studied mature mainly in October. At both sites, the percentage of connective tissue for the analyzed mussel individuals ranged between 15 and 70% of gonadal coverage. The results obtained in the present study showed differences in the reproductive cycles of Mytilus chilensis between the sites sampled. These differences could be due to environmental differences (e.g. temperature) caused by the latitudinal gradient.

Idioma originalSpanish
Páginas (desde-hasta)512-525
Número de páginas14
PublicaciónLatin American Journal of Aquatic Research
Volumen39
N.º3
DOI
EstadoPublished - 1 nov 2011

Huella dactilar

Mytilidae
mussels
Chile
Bivalvia
spawning
connective tissues
quantitative analysis
latitudinal gradient
qualitative analysis
gonadosomatic index
reproductive cycle
gonads
bivalve
water temperature
oocytes
autumn
Mytilus chilensis
gender
temperature
tissue

ASJC Scopus subject areas

  • Oceanography
  • Aquatic Science

Citar esto

Oyarzún, Pablo A. ; Toro, Jorge E. ; Jaramillo, Roberto ; Guiñez, Ricardo ; Briones, Carolina ; Astorga, Marcela. / Ciclo gonadal del chorito Mytilus chilensis (Bivalvia : Mytilidae) en dos localidades del sur de Chile. En: Latin American Journal of Aquatic Research. 2011 ; Vol. 39, N.º 3. pp. 512-525.
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title = "Ciclo gonadal del chorito Mytilus chilensis (Bivalvia: Mytilidae) en dos localidades del sur de Chile",
abstract = "A qualitative and quantitative analysis was carried out of the gonadal cycle of the bivalve Mytilus chilensis from Chaihu{\'i}n and Yal bay, southern Chile, between October 2007 and June 2008. Four gametogenic stages were determined using histological analysis of the gonads, and quantitative estimates were made of the Gametic Volume Fraction (VFG), percentage of inter follicular connective tissue, and the Gonadosomatic Index (IG). The quantitative analysis (VFG) was the best indicator of spawning. Two spawning events, one in October and one in March, were observed simultaneously in both sexes of mussels from Chaihu{\'i}n. However, for specimens from bah{\'i}a Yal, four spawning events were registered, principally from March to June (autumn), when the water temperature decreased. The relationship between the IG and the gametogenic stages was very low, as was that between the IG and the percentage of mature oocytes. Therefore, the IG is not a good indicator of spawning in this species. A re-evaluation of the ban period established for Mytilus chilensis (1 November to 31 December) is suggested since most individuals from the populations studied mature mainly in October. At both sites, the percentage of connective tissue for the analyzed mussel individuals ranged between 15 and 70{\%} of gonadal coverage. The results obtained in the present study showed differences in the reproductive cycles of Mytilus chilensis between the sites sampled. These differences could be due to environmental differences (e.g. temperature) caused by the latitudinal gradient.",
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Ciclo gonadal del chorito Mytilus chilensis (Bivalvia : Mytilidae) en dos localidades del sur de Chile. / Oyarzún, Pablo A.; Toro, Jorge E.; Jaramillo, Roberto; Guiñez, Ricardo; Briones, Carolina; Astorga, Marcela.

En: Latin American Journal of Aquatic Research, Vol. 39, N.º 3, 01.11.2011, p. 512-525.

Resultado de la investigación: Article

TY - JOUR

T1 - Ciclo gonadal del chorito Mytilus chilensis (Bivalvia

T2 - Mytilidae) en dos localidades del sur de Chile

AU - Oyarzún, Pablo A.

AU - Toro, Jorge E.

AU - Jaramillo, Roberto

AU - Guiñez, Ricardo

AU - Briones, Carolina

AU - Astorga, Marcela

PY - 2011/11/1

Y1 - 2011/11/1

N2 - A qualitative and quantitative analysis was carried out of the gonadal cycle of the bivalve Mytilus chilensis from Chaihuín and Yal bay, southern Chile, between October 2007 and June 2008. Four gametogenic stages were determined using histological analysis of the gonads, and quantitative estimates were made of the Gametic Volume Fraction (VFG), percentage of inter follicular connective tissue, and the Gonadosomatic Index (IG). The quantitative analysis (VFG) was the best indicator of spawning. Two spawning events, one in October and one in March, were observed simultaneously in both sexes of mussels from Chaihuín. However, for specimens from bahía Yal, four spawning events were registered, principally from March to June (autumn), when the water temperature decreased. The relationship between the IG and the gametogenic stages was very low, as was that between the IG and the percentage of mature oocytes. Therefore, the IG is not a good indicator of spawning in this species. A re-evaluation of the ban period established for Mytilus chilensis (1 November to 31 December) is suggested since most individuals from the populations studied mature mainly in October. At both sites, the percentage of connective tissue for the analyzed mussel individuals ranged between 15 and 70% of gonadal coverage. The results obtained in the present study showed differences in the reproductive cycles of Mytilus chilensis between the sites sampled. These differences could be due to environmental differences (e.g. temperature) caused by the latitudinal gradient.

AB - A qualitative and quantitative analysis was carried out of the gonadal cycle of the bivalve Mytilus chilensis from Chaihuín and Yal bay, southern Chile, between October 2007 and June 2008. Four gametogenic stages were determined using histological analysis of the gonads, and quantitative estimates were made of the Gametic Volume Fraction (VFG), percentage of inter follicular connective tissue, and the Gonadosomatic Index (IG). The quantitative analysis (VFG) was the best indicator of spawning. Two spawning events, one in October and one in March, were observed simultaneously in both sexes of mussels from Chaihuín. However, for specimens from bahía Yal, four spawning events were registered, principally from March to June (autumn), when the water temperature decreased. The relationship between the IG and the gametogenic stages was very low, as was that between the IG and the percentage of mature oocytes. Therefore, the IG is not a good indicator of spawning in this species. A re-evaluation of the ban period established for Mytilus chilensis (1 November to 31 December) is suggested since most individuals from the populations studied mature mainly in October. At both sites, the percentage of connective tissue for the analyzed mussel individuals ranged between 15 and 70% of gonadal coverage. The results obtained in the present study showed differences in the reproductive cycles of Mytilus chilensis between the sites sampled. These differences could be due to environmental differences (e.g. temperature) caused by the latitudinal gradient.

KW - Gametogenic development

KW - Histology

KW - Mytilus chilensis

KW - Reproduction

KW - Southern Chile

KW - Spawning

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