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Length-weight relationships and condition factor of two Sciaenid species Micropogonias furnieri and Cynoscion guatucupa from the Rio de la Plata and Uruguayan ocean coast, Southwestern Atlantic

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Influencia de las variables fisicoquímicas en la estructura de tallas y distribución de Meoma ventricosa grandis (Echinodermata: Brissidae) dentro del canal Boca Chica, Acapulco, México

Local scale variation in the reproductive pattern of the southern geoduck, Panopea abbreviata(Bivalvia: Hiatellidae), in Patagonia

Authors

CORRESPONDING

Paula C. Zaidman

paulazaidman@ibmpas.org

1

1

Centro de Investigación Aplicada y Transferencia Tecnológica en Recursos Marinos Alte. Storni (CIMAS), Universidad Nacional del Comahue, Provincia de Río Negro, CONICET Guemes 1030, San Antonio Oeste, Rio Negro, Argentina

3

3

Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Av. Rivadavia 1917, (C1033AAJ) CABA, Argentina

Marina A. Kroeck

1

1

Centro de Investigación Aplicada y Transferencia Tecnológica en Recursos Marinos Alte. Storni (CIMAS), Universidad Nacional del Comahue, Provincia de Río Negro, CONICET Guemes 1030, San Antonio Oeste, Rio Negro, Argentina

Silvina Van der Molen

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2

Centro para el Estudio de Sistemas Marinos, CONICET, Boulevard Brown 2850 (U9120ACV), Puerto Madryn, Chubut, Argentina

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3

Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Av. Rivadavia 1917, (C1033AAJ) CABA, Argentina

Gabriela Williams

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2

Centro para el Estudio de Sistemas Marinos, CONICET, Boulevard Brown 2850 (U9120ACV), Puerto Madryn, Chubut, Argentina

3

3

Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Av. Rivadavia 1917, (C1033AAJ) CABA, Argentina

Leilen Gracia-Villalobos

2

2

Centro para el Estudio de Sistemas Marinos, CONICET, Boulevard Brown 2850 (U9120ACV), Puerto Madryn, Chubut, Argentina

3

3

Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Av. Rivadavia 1917, (C1033AAJ) CABA, Argentina

Erica Oehrens-Kissner

1

1

Centro de Investigación Aplicada y Transferencia Tecnológica en Recursos Marinos Alte. Storni (CIMAS), Universidad Nacional del Comahue, Provincia de Río Negro, CONICET Guemes 1030, San Antonio Oeste, Rio Negro, Argentina

Enrique M. Morsan

1

1

Centro de Investigación Aplicada y Transferencia Tecnológica en Recursos Marinos Alte. Storni (CIMAS), Universidad Nacional del Comahue, Provincia de Río Negro, CONICET Guemes 1030, San Antonio Oeste, Rio Negro, Argentina

Abstract

During 2007 was carried out studies to explore local scale spatial variability in the reproductive cycle of Panopea abbreviata in 3 sites of the northern Patagonian gulfs (El Sótano and Puerto Lobos, in San Matías Gulf, and Punta Conos in San José Gulf), Argentina. Previous reports have revealed that P. abbreviata exhibits a reproductive pattern characterized, in both sexes, by continuous proliferation of gametes and spawning throughout the year. However, the use of quantitative indicators for females has shown a slight seasonality to this pattern. Local spatial variability in the reproductive cycle of P. abbreviata was observed at 3 sites and related to variation in the annual temperature regime at each locality. The females of El Sótano and Puerto Lobos showed similar seasonality in the reproductive pattern: proliferation and maturation phases prevailed over spawning stages when temperature decreased during autumn (March-May); this pattern was reversed when temperatures began to increase during spring (September-November). At Punta Conos this pattern is more irregular. However, at all localities, mature individuals of both sexes were present throughout the year, without a resting period during the reproductive cycle. The reproductive pattern is similar in the 3 sites with many small pulses in reproductive activity that are difficult to detect and characterized by year-round spawning. The same pattern was found in other localities of P. abbreviataand is unique in the genus Panopea.

Key words

Geoduck, Panopea abbreviata, gametogenesis, reproductive cycle, North Patagonia

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