Study of the Mussel Aulacomya ater, Molina, 1782 (Bivalvia: Mytilidae), near Santa Rosa Island, Independence Bay, Peru, during the El Niño Phenomenon 1997- 98

Gamarra, Alex; Cornejo, Oswaldo

doi:10.4067/s0717-71782002030100045

Cited by 3 publications

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“…The continuous spawning of this species in the south has also been indicated for the suspended cultivations of Yaldad Bay (Chiloé), with periods of greater intensity in April, August–November and February (Jaramillo & Navarro ). Continuous spawning has also been reported for populations from South Africa and Peru, with intense periods reported to last mainly from August to February (Griffiths ; Gamarra & Cornejo ). These data agree with the results obtained for the population of A. ater from Caleta Punta Arenas, which presented continuous spawning throughout the year, with important releases between August and September, and October and November.…”

Section: Discussionmentioning

confidence: 81%

Reproductive cycle, collection and early growth ofAulacomya ater, Molina 1782 (Bivalvia: Mytilidae) in northern Chile

Avendaño

Cantillánez

2012

Aquac Res

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We evaluated the reproductive cycle of Aulacomya ater at Caleta Punta Arenas (Antofagasta, Chile), finding two important spawning periods (August-September and October-November) associated with declining water temperatures. Mytilid collectors were installed at Caleta Punta Arenas and Caleta Errázuriz (250 km further south) in November and then extracted in consecutive time periods. The results showed settlements of A. ater along with Choromytilus chorus (Molina) and Semimytilus algosus (Gould). An analysis of the spat size structure from each period revealed different micro-cohorts for each species; the microcohorts of C. chorus were predominant. Daily growth rates were estimated using the average sizes of the micro-cohorts on two consecutive dates. Although the daily growth rates did not vary significantly between sites for a given species, these rates were lowest for A. ater and highest for S. algosus. The abundance and greater growth of C. chorus caused interspecific competition with A. ater that was detrimental to the survival of the latter. We hypothesize the existence of a metapopulation of A. ater in northern Chile that would explain the settlement of four micro-cohorts on collectors after 28 days at Caleta Punta Arenas, and the settlement recorded after 80 days at Caleta Errázuriz.

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Section: Discussionmentioning

confidence: 81%

Reproductive cycle, collection and early growth ofAulacomya ater, Molina 1782 (Bivalvia: Mytilidae) in northern Chile

Avendaño

Cantillánez

2012

Aquac Res

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“…We suggest that any early observed pattern had to have been superseded by the interaction among at least three factors of natural and anthropogenic origin. First, El Niño events are well known to cause mass mortality of ribbed mussels in Peru and Northern Chile, which leads to either drastic decreases in abundance or local extinctions (Gamarra & Cornejo ; Laudien et al . ; Thiel et al .…”

Section: Discussionmentioning

confidence: 99%

“…Second, at least in some areas in Northern Chile, the absence or reduction of mussel beds is likely a consequence of limited larval supply (Thiel et al . ), and it is noted that both larval supply and recruitment can be highly affected by El Niño or La Niña events (Gamarra & Cornejo ; Thatje et al . ).…”

Section: Discussionmentioning

confidence: 99%

“…physical disturbance, predation, inter‐specific competition; Noda ; Hamilton ; Thiel & Ullrich ; Navarrete et al . ), with the currently available data it is only possible to discuss the unpredictable changes in size structure caused by mass mortalities and recruitment failures during strong El Niño events in Peru and Northern Chile (Gamarra & Cornejo ; Carranza et al . ).…”

Section: Discussionmentioning

confidence: 99%

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Diversity of faunal assemblages associated with ribbed mussel beds along the South American coast: relative roles of biogeography and bioengineering

2016

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Benthic organisms are among the most diverse and abundant in the marine realm, and some species are a key factor in studies related to bioengineering. However, their importance has not been well noted in biogeographic studies. Macrofaunal assemblages associated with subtidal beds of the ribbed mussel (Aulacomya atra) along South America were studied to assess the relationship between their diversity patterns and the proposed biogeographic provinces in the Southeastern Pacific and Southwestern Atlantic Oceans. Samples from ribbed mussel beds were obtained from 10 sites distributed from the Peruvian coast (17°S) to the Argentinean coast (41°S). The sampling included eight beds in the Pacific and two in the Atlantic and the collections were carried out using five 0.04 m 2 quadrants per site. Faunal assemblages were assessed through classification analyses using binary and log-transformed abundance data. Variation in the size and density of mussels, and in the species richness, abundance and structure of their faunal assemblages were tested using a permutational multivariate analysis of variance. Faunal assemblages showed a north-south latitudinal gradient along both the Pacific and Atlantic coasts. Binary and abundance data showed a difference in the resulting clustering arrangement of Pacific sites between 40°S and 44°S, indicating a pattern of continuity in the species distribution associated with biological substrates. At a regional scale, the distribution of species along the South American coast matched the general provincial pattern shown by prior studies, which show two biogeographic units on the Pacific coast separated by an intermediate (probably transitional) zone and a single province on the Atlantic coast extending up to Northern Argentina. Biological substrates such as ribbed mussel beds play an important ecological role by making a similar habitat type available on a large scale for a variety of invertebrate species. Despite such habitat homogeneity, however, the associated fauna exhibit marked distribution breaks, suggesting strong constraints on dispersal. This therefore suggests that macrofaunal assemblages could possibly be used as biogeographic indicators.

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Relationship between energy allocation and gametogenesis in Aulacomya atra (Bivalvia: Mytilidae) in a sub-Antarctic environment

Pérez¹,

Boy²,

Curelovich³

et al. 2013

Rev. biol. mar. oceanogr.

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Resumen.-Se analizó la gametogénesis y la variación temporal en la asignación de energía a diferentes órganos de Aulacomya atra del Canal Beagle (Tierra del Fuego). El periodo de desove de A. atra se extendió desde el final del invierno hasta la primavera, cuando el MGI (Índice gónada-manto) resultó mínimo y el número de individuos desovados, máximo. En los machos maduros el incremento del MGI coincidió con un descenso en la densidad energética del manto-gónada (ED MG), lo que está relacionado con un aumento de masa con menor energía. En hembras maduras el incremento de MGI se relaciona con un aumento de masa con valores más altos de energía, que determina el aumento de la ED MG. Durante la maduración gonadal existen diferentes estrategias de asignación de energía en ambos sexos, aunque se alcanza similar contenido de energía en el manto-gónada; los machos mantienen gónadas más grandes, pero con menos energía por unidad de masa que las hembras. Además, en los individuos maduros desciende el valor del índice de la glándula digestiva (DGI), incrementa el MGI, y tiende a la depleción de la ED y del contenido energético, sugiriendo que este órgano actuaría como reservorio de energía.

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Study of the Mussel Aulacomya ater, Molina, 1782 (Bivalvia: Mytilidae), near Santa Rosa Island, Independence Bay, Peru, during the El Niño Phenomenon 1997- 98

Cited by 3 publications

References 0 publications

Reproductive cycle, collection and early growth ofAulacomya ater, Molina 1782 (Bivalvia: Mytilidae) in northern Chile

Reproductive cycle, collection and early growth ofAulacomya ater, Molina 1782 (Bivalvia: Mytilidae) in northern Chile

Diversity of faunal assemblages associated with ribbed mussel beds along the South American coast: relative roles of biogeography and bioengineering

Relationship between energy allocation and gametogenesis in Aulacomya atra (Bivalvia: Mytilidae) in a sub-Antarctic environment

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