Displacement of diverse ichthyoplankton assemblages by a coastal upwelling event on the Sydney shelf

Smith, Kim; Suthers, Iain M.

doi:10.3354/meps176049

Cited by 58 publications

(45 citation statements)

References 29 publications

(44 reference statements)

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“…Therefore, the composition of the larval fish community, at the family-level, is similar to that of other oceanic islands (Leis, 1991;Boehlert et al, 1992). Larval abundances were also similar to those found in similar studies off the Balearic Islands in the Mediterranean Sea (Alemany et al, 2006), off Australia (Smith and Suthers, 1999;Muhling et al, 2008) and in the Agulhas Current (Beckley and van Ballegooyen, 1992).…”

Section: Discussionsupporting

confidence: 65%

Temporal and along-shelf distribution of the larval fish assemblage at Gran Canaria, Canary Islands

Hernández‐León

Moyano

2009

Sci. Mar.

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SUMMARY: Temporal and spatial variations of the larval fish community off the island of Gran Canaria (Canary Islands) were studied in weekly surveys from October 2005 to June 2006. A total of 156 taxa, belonging to 51 families and 15 orders, were identified. Myctophidae was by far the most abundant family (30%), followed by Sparidae (11%), Clupeidae (9%) and Gonostomatidae (7%). As expected for an oceanic island, neritic and oceanic taxa contributed in similar proportions. Leeward and windward retention areas were found for total egg and neritic larval abundance. However, seasonality showed a stronger influence on the annual larval assemblage than sampling site, as the latter was not significant on a long time scale. Results suggest that there are two seasonal larval assemblages corresponding to the two main characteristic periods of the water column in these waters: mixing (winter) and stratification (summer). In addition, a significant relationship was recorded between lunar illumination and small mesozooplankton biomass, suggesting that this relationship may be extended to certain neritic families. The most abundant neritic larvae (Sparidae) showed this lunar pattern, which partially supports a recent hypothesis about the effect of lunar illumination on larval fish survival and development in subtropical waters.Keywords: ichthyoplankton, larval assemblages, mesozooplankton, seasonal variation, lunar illumination. RESUMEN: VARIACIONES ESTACIONALES Y ESPACIALES DE LA COMUNIDAD DE LARVAS DE PECES DE GRAN CANARIA, ISLAS CANARIAS.-Se estudiaron las variaciones temporales y espaciales en la comunidad de larvas de peces de la isla de Gran Canaria (Islas Canarias) a partir de muestreos semanales desde octubre 2005 a junio 2006. Se identificaron un total de 156 taxones, pertenecientes a 51 familias y 15 órdenes. La familia Myctophidae fue la más abundante (30%), seguida por Sparidae (11%), Clupeidae (9%) y Gonostomatidae (7%). Como es de esperar en una isla oceánica, los taxones neríticos y oceánicos contribuyeron en proporciones similares. Se encontraron dos zonas de retención para huevos y larvas de especies neríticas, a sotavento y barlovento de la isla. Sin embargo, la estacionalidad mostró una mayor influencia en la estructura de la comunidad larvaria que la zona de muestreo, siendo ésta no significativa a largo plazo. Se observaron dos asociaciones estacionales de larvas correspondiendo con los dos períodos más característicos en la columna de agua: periodo de mezcla (invierno) y de estratificación (verano). Además, se encontró una relación significativa entre la iluminación lunar y la biomasa del zooplancton de pequeño tamaño, que podría ser extensible a las larvas neríticas. Las larvas neríticas más abundantes (Sparidae) mostraron una relación con el ciclo lunar, apoyando parcialmente una hipótesis reciente sobre el efecto de la iluminación lunar en la supervivencia larvaria y su desarrollo en aguas subtropicales.Palabras clave: ictioplancton, asociaciones de larvas, mesozooplancton, variaciones estacionales, ...

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Section: Discussionsupporting

confidence: 65%

Temporal and along-shelf distribution of the larval fish assemblage at Gran Canaria, Canary Islands

Hernández‐León

Moyano

2009

Sci. Mar.

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“…Advection also influences the structure of communities, or more properly assemblages (e.g. Smith and Suthers, 1999;Hinrichsen et al, 2003). Many fishes release eggs into the pelagia, typically in the upper 200 m (e.g.…”

Section: Abundance and Distribution Of Fish Eggs And Larvae In The Oceanmentioning

confidence: 99%

Fisheries oceanography and the ecology of early life histories of fishes: a perspective over fifty years

Govoni¹

2005

Sci. Mar.

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SUMMARY: Fisheries oceanography can be defined as the study of the ecology of fishes in the ocean: so defined, it comprises study at all levels of ecological organization-organisms, populations, communities, and ecosystems. The early life history of fishes plays out at each of these levels of organization. A paradigm developed by Johan Hjort at the turn of the twentieth century, along with postulates by Hjort and many of his colleagues that followed, came to guide much of fisheries oceanography through the ensuing hundred years. Research themes that address these postulates can be roughly partitioned as the study of the physiological ecology of the eggs and larvae of fishes in the sea, and the study of the abundance and distribution of fish propagules. Using case studies of organisms and physical processes, considerable progress has been made in understanding the causes of variation in population recruitment, defined either by stage-based models and simulated by individual-based models. Some of this progress has been published in Scientia Marina, or its predecessor Investigación Pesquera. The causes of variation, however, are interactive and operative at differing, yet often overlapping, spatial and temporal scales. Difficulty in matching spatial scales that typically differ by an order of magnitude or more, will continue to trouble the resolution of causes of population recruitment. Moreover, study of the causes of variation in recruitment has not led to predictive power at an annual scale. Prediction at a decadal scale, using community (or more appropriately larval fish assemblages) and ecosystem level dynamics, is more hopeful. -La oceanografía pesquera puede ser definida como la ecología de los peces en el océano: definida de este modo, comprende el estudio a todos los niveles de organización ecológica: organismos, poblaciones, comunidades y ecosistemas. Los primeros estadios de desarrollo de los peces intervienen en cada uno de estos niveles de organización. El paradigma desarrollado por Johan Hjort a principio de siglo veinte, junto con postulados posteriores del propio Hjort y muchos de sus colegas, han servido de guía de la oceanografía pesquera de los siguientes cien años. Los temas de investigación a que conducen estos postulados pueden ser fundamentalmente divididos en el estudio de la ecología fisioló-gica de los huevos y larvas de peces en el mar y el estudio de la distribución y abundancia de los propágulos. Utilizando el estudio de casos particulares de organismos, se han conseguido considerables progresos en la comprensión de las causas de variación en el reclutamiento de las poblaciones, definido ya sea por los modelos basados en el estadio de desarrollo o en simulaciones basadas en el individuo. Algunos de estos avances han sido publicados en Scientia Marina, o en su predecesora Investigación Pesquera. No obstante, las causas de variación son interactivas y operativas a escalas espaciales y temporales distintas, o incluso solapadas. La dificultad para ajustar las escalas espaciales que típicame...

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“…The vertical distribution of fish larvae has often been linked to the thermal stratification of the water column (Roepke et al, 1993;Boehlert & Mundy, 1994;Moser & Pommeranz, 1999). The thermocline is considered important as a barrier (Smith & Suthers, 1999) or as an indirect measurement of the offshore Ekman layer, that acts above or below in the vertical distribution of some fish larvae (Coombs et al, 1981;Davis et al, 1990;Olla & Davis, 1990;Rojas, 2014). The significant correlations found between the depth values of physical variables with the vertical position of some fish larvae having bathy-mesopelagic (V. lucetia) and epimesopelagic (T. oculeus) habits, suggest that location of the thermocline and oxygen minimum zone may have a large influence on the vertical distribution of these species.…”

Section: Wmdmentioning

confidence: 99%

Fish larvae retention linked to abrupt bathymetry at Mejillones Bay (northern Chile) during coastal upwelling events

Rojas¹,

Landaeta²

2014

lajar

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ABSTRACT. The influence of oceanic circulation and bathymetry on the fish larvae retention inside Mejillones Bay, northern Chile, was examined. Fish larvae were collected during two coastal upwelling events in November 1999 and January 2000. An elevated fish larvae accumulation was found near an oceanic front and a zone of low-speed currents. Three groups of fish larvae were identified: the coastal species (Engraulis ringens and Sardinops sagax), associated with high chlorophyll-a levels; larvae from the families Phosichthyidae (Vinciguerria lucetia) and Myctophidae (Diogenichthys laternatus and Triphoturus oculeus), associated with the thermocline (12°C), and finally, larvae of the families Myctophidae (Diogenichthys atlanticus) and Bathylagidae (Bathylagus nigrigenys), associated with high values of temperature and salinity. The presence of a seamount and submarine canyon inside Mejillones Bay appears to play an important role in the circulation during seasonal upwelling events. We propose a conceptual model of circulation and particles retention into Mejillones Bay. The assumption is that during strong upwelling conditions the flows that move along the canyon emerge in the centre of Mejillones Bay, producing a fish larvae retention zone. Understanding the biophysical interactions responsible to trap and/or concentrate particles is essential to protect these fragile upwelling ecosystems.

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Displacement of diverse ichthyoplankton assemblages by a coastal upwelling event on the Sydney shelf

Cited by 58 publications

References 29 publications

Temporal and along-shelf distribution of the larval fish assemblage at Gran Canaria, Canary Islands

Temporal and along-shelf distribution of the larval fish assemblage at Gran Canaria, Canary Islands

Fisheries oceanography and the ecology of early life histories of fishes: a perspective over fifty years

Fish larvae retention linked to abrupt bathymetry at Mejillones Bay (northern Chile) during coastal upwelling events

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