Nearshore surface temperatures in Antofagasta Bay (Chile) and adjacent upwelling centers

Piñones, Andrea; Castilla, J. C.; Guíñez, Ricardo; Largier, J. L.

doi:10.7773/cm.v33i1.1226

Cited by 48 publications

(33 citation statements)

References 15 publications

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“…Previous studies of topographic eddies include island wake effects (Wolanski and Hamner 1988) and larger headland recirculation features (Penven et al 2000). In general, small-scale headlands in upwelling regions have been neglected on the basis of the expectation that surface wind stress rapidly flushes small bays and precludes the stratification that is typically associated with vertically sheared flow and the potential for retention and accumulation (as in upwelling shadows, Graham and Largier 1997;Marin et al 2001;Pinones et al 2007). We showed that larvae do accumulate in smaller bays in upwelling regions, despite strong surface wind stress and the absence of stratification.…”

Section: Discussionmentioning

confidence: 99%

Larval retention, entrainment, and accumulation in the lee of a small headland: Recruitment hotspots along windy coasts

Morgan

Fisher

Largier

2010

Limnology & Oceanography

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We surveyed crustacean larvae in the plankton in the lee of Bodega Head, California, for 2 months during late spring and summer and cross-correlated the larval abundance and stage of development of 16 taxa with 8 indicators of upwelling-relaxation conditions. Larvae in all stages of development for 11 of these taxa were entrained and accumulated in a recirculation feature in Bodega Bay, found in the lee of this small headland as soon as upwelling-favorable winds began, and persisted until winds weakened. The remaining taxa were more prevalent during relaxation events when the recirculation feature dissipated and a poleward coastal current transported larvae into and through the bay. During upwelling conditions, a vertically sheared flow occurs in the lee of the headland that accounts for the accumulation of plankton. However, larval behavior did not have a substantial effect on density and persistence in the lee of the headland, regardless of whether taxa were more prevalent during upwelling or relaxation conditions or whether they developed entirely nearshore or migrated offshore later in development. Thus, larvae and postlarvae of many, diverse taxa are concentrated in the plankton in the lee of small headlands in upwelling areas, which is consistent with previously reported recruitment hot spots in small upwelling bays. These headland-related hot spots increase spatial structure in population density and community structure in recruitment-limited upwelling regions and other wind-driven coasts.

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Section: Discussionmentioning

confidence: 99%

Larval retention, entrainment, and accumulation in the lee of a small headland: Recruitment hotspots along windy coasts

Morgan

Fisher

Largier

2010

Limnology & Oceanography

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“…Puerto Montt is located close to the southern limit of this species. In Antofagasta Bay, SST is signiWcantly higher than in the surrounding Humboldt Current upwelling system (+2-3°C) due to the bay's particular oceanographic conditions (Piñones et al 2007), and thus SST is comparable to the temperature encountered by C. setosus at its northern distributional limit oV Ecuador (Fischer et al 2009b). Two females (IDs A, B) (inXuence of temperature encountered during larval development) in Antofagasta were maintained individually in Xow-through seawater aquaria (12 l) at ambient temperature »16.0°C, while four females (IDs C, D, E, and F) (inXuence of temperature encountered during embryonic development on larval morphology) were held in 3,200 l Xow-through aquaria (·12 ind./basin) under natural seasonal temperature conditions (up to 10 months; 16-23°C) in Antofagasta.…”

Section: Introductionmentioning

confidence: 99%

Temperature effects on zoeal morphometric traits and intraspecific variability in the hairy crab Cancer setosus across latitude

2009

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Phenotypic plasticity is an important but often ignored ability that enables organisms, within species-speciWc physiological limits, to respond to gradual or sudden extrinsic changes in their environment. In the marine realm, the early ontogeny of decapod crustaceans is among the best known examples to demonstrate a temperature-dependent phenotypic response. Here, we present morphometric results of larvae of the hairy crab Cancer setosus, the embryonic development of which took place at diVerent temperatures at two diVerent sites (Antofagasta, 23°45Ј S; Puerto Montt, 41°44Ј S) along the Chilean Coast. Zoea I larvae from Puerto Montt were signiWcantly larger than those from Antofagasta, when considering embryonic development at the same temperature. Larvae from Puerto Montt reared at 12 and 16°C did not diVer morphometrically, but sizes of larvae from Antofagasta kept at 16 and 20°C did, being larger at the colder temperature. Zoea II larvae reared in Antofagasta at three temperatures (16, 20, and 24°C) showed the same pattern, with larger larvae at colder temperatures. Furthermore, larvae reared at 24°C, showed deformations, suggesting that 24°C, which coincides with temperatures found during strong EL Niño events, is indicative of the upper larval thermal tolerance limit. C. setosus is exposed to a wide temperature range across its distribution range of about 40° of latitude. Phenotypic plasticity in larval oVspring does furthermore enable this species to locally respond to the inter-decadal warming induced by El Niño. Morphological plasticity in this species does support previously reported energetic trade-oVs with temperature throughout early ontogeny of this species, indicating that plasticity may be a key to a species' success to occupy a wide distribution range and/or to thrive under highly variable habitat conditions.

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“…This appears to be the case of the population in Antofagasta Bay, where the local oceanographic setting promotes circulation and retention of water masses of higher temperature and higher phytoplankton concentration (Piñones et al 2007). Under these local conditions, A. purpuratus display continuous gametogenic activity (Avendaño et al 2008), resembling populations further north.…”

Section: Discussionmentioning

confidence: 99%

Latitudinal variation in the reproductive cycle of two bivalves with contrasting biogeographical origin along the Humboldt Current Upwelling Ecosystem

Uribe¹,

Oliva²,

Aguilar³

et al. 2011

Sci. Mar.

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SUMMARY:Argopecten purpuratus (Lamarck, 1819) and Mesodesma donacium (Lamarck, 1818) are bivalves that inhabit the Humboldt Current Upwelling Ecosystem. They have contrasting biogeographical origins, suggesting that their responses to exogenous factors should differ. Using circular statistics, we examine synchrony/asynchrony in the reproductive cycle between populations of each species. The results indicate that there is reproductive asynchrony in both species along their distributional range. However, there was synchrony for A. purpuratus in several location-pairs, including Paita-Chimbote, Chimbote-Callao, Callao-Pisco and Pisco-Antofagasta. For M. donacium, there were only two synchronic groups: Camaná-Capellanía-Mehuín and Hornitos-Peñuelas-Longotoma-La Ligua-Cucao-Quilanlar. A. purpuratus showed gametogenenic activity throughout the year. In contrast, M. donacium showed strong seasonality, with gametogenesis in winter and spawning in spring/summer. In conclusion, the patterns observed for these sympatric species suggest that on a large scale the reproductive cycles follow the expected patterns for the contrasting biogeographic origin of each species, so it could be argued that they are modulated by endogenous factors. However, at a local scale, the reproductive cycles of these species show variation, likely determined by local oceanographic or hydrographic processes.Keywords: Mesodesma donacium, Argopecten purpuratus, synchronic reproduction, gametogenesis, exogenous factors, circular statistics. RESUMEN: Variación latitudinal del ciclo reproductivo de dos bivalvos con orígenes biogeográficos contrastantes a lo largo del ecosistema de afloramiento de la Corriente de Humboldt. -Argopecten purpuratus (Lamarck, 1819) y Mesodesma donacium (Lamarck, 1818) son moluscos bivalvos endémicos del sistema de afloramiento de la Corriente de Humboldt pero tienen orígenes biogeográficos opuestos. Por tanto, se esperaría que los factores exógenos afectaran sus ritmos biológicos diferencialmente, entre ellos sus ciclos reproductivos. Mediante análisis de distribución circular se evaluó el sincronismo/asincronismo en ciclos reproductivos entre poblaciones de cada especie. Los resultados indican que existe asincronía reproductiva en ambas especies a lo largo de su distribución. Sin embargo para A. purpuratus se encontró varios pares de localidades sincrónicas: Paita-Chimbote; Chimbote-Callao; Callao-Pisco y Pisco-Antofagasta, y para M. donacium se dieron dos grupos sincrónicos, el primero entre las poblaciones de Camaná, Capellanía y Mehuín; y el segundo grupo entre Hornitos, Peñuelas, Longotoma, La Ligua, Cucao y Quilanlar. A. purpuratus presentó actividad gametogénica continua. En contraste, M. donacium presentó una marcada estacionalidad, con gametogénesis durante invierno y desoves durante primavera y/o verano. En conclusión, los patrones observados para ambas especies simpátricas sugieren que, a gran escala el ciclo reproductivo sigue los patrones esperados para el origen biogeográfico contrastante de cada especie, por...

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Nearshore surface temperatures in Antofagasta Bay (Chile) and adjacent upwelling centers

Cited by 48 publications

References 15 publications

Larval retention, entrainment, and accumulation in the lee of a small headland: Recruitment hotspots along windy coasts

Larval retention, entrainment, and accumulation in the lee of a small headland: Recruitment hotspots along windy coasts

Temperature effects on zoeal morphometric traits and intraspecific variability in the hairy crab Cancer setosus across latitude

Latitudinal variation in the reproductive cycle of two bivalves with contrasting biogeographical origin along the Humboldt Current Upwelling Ecosystem

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