Mesozooplankton features in a frontal area off northern Patagonia (Argentina) during spring 1995 and 1998

Sabatini, Marina Elena; Martos, Patricia

doi:10.3989/scimar.2002.66n3215

Cited by 92 publications

(105 citation statements)

References 36 publications

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“…O primeiro registro da espécie no Brasil foi feito no estuário do rio Vasa-Barris (estado de Sergipe) por ARAÚJO & MONTÚ (1993) e posteriormente por MUXAGATA & GLOEDEN (1995) no estuário da Lagoa dos Patos (RS), sendo considerada espécie invasora destas regiões. Acartia tonsa e Subeucalanus pileatus apresentaram certa freqüência e abundância ao longo do ano na Praia de Tramandaí, da mesma forma que foram freqüentes nas praias do sul do Rio Grande do Sul no levantamento feito por BERSANO (1994) e podem ser encontradas em regiões costeiras e estuários desde a Argentina e ao longo da costa Brasileira (SABATINI & MARTOS, 2002;BERASATEGUI et al, 2006;STERZA & FERNANDEZ, 2006). De acordo com suas distribuições espaciais, A. tonsa foi classificada por MONTÚ (1980) como eurihalina e euritérmica (o que explica sua ampla distribuição latitudinal) porém não atingindo grandes densidades ao se afastar da zona costeira em direção à plataforma aberta.…”

Section: Discussionunclassified

“…Esta espécie tem origem subantártica, sendo geralmente dominante em zonas de convergência da Corrente Circumpolar Antártica (BERNARD & FRONEMAN, 2003, 2005. Na margem oeste do Atlântico Sul, aparece na Argentina com freqüência e grande abundância sobre a plataforma continental (SABATINI & MARTOS, 2002;BERASATEGUI et al, 2006), sendo registrado no Brasil na região de Cabo frio (VALENTIN et al, 1975;VALENTIN, 1980) em eventos de ressurgência.…”

Section: Discussionunclassified

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Variação temporal do zooplâncton da Praia de Tramandaí, Rio Grande do Sul, com ênfase em Copepoda

Avila

Pedrozo

Bersano

2009

Iheringia, Sér. Zool.

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ABSTRACT. Temporal variation of the zooplankton from Tramandaí Beach, RS, southern Brazil, with emphasis on Copepoda. The temporal variability of density, species composition, biomass and diversity of the surf zone zooplankton from Tramandaí Beach, RS, Brazil, was studied between August 2005 and August 2006. Samples were taken forthnightly using a zooplankton net of 150 cm total length, 50 cm mouth diameter and 300 µm nylon mesh size. Data on clorofila-a, wind direction, longshore current, salinity, air and water temperature were taken as well. Copepoda presented the highest species diversity, being Temora turbinata (Dana, 1849) the species with higher relative abundance and frequency of occurrence. Other Copepoda species were also numerically important, such as Acartia tonsa (Dana, 1849), Subeucalanus pileatus (Glesbrecht, 1888) and Ctenocalanus vanus (Glesbrecht, 1888). The Mysidacea Metamysidopsis elongata atlantica (Bascescu, 1968) presented frequency of 58.33% and relative abundance of 44%. The peak of mesozooplanktonic biomass (96 mg.m -³) was recorded in September/2005, corresponding to the maximum density value presented for this species (3,535 org.m -³). Information about zooplankton of this region is scarce and the results of this study will provide a base for the knowledge about the biological processes occurring in the surf zone of Tramandaí Beach.

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Section: Discussionunclassified

Variação temporal do zooplâncton da Praia de Tramandaí, Rio Grande do Sul, com ênfase em Copepoda

Avila

Pedrozo

Bersano

2009

Iheringia, Sér. Zool.

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“…Santos and Ramirez 1995, Capitanio and Esnal 1998, Sabatini and Martos 2002. They highlight the high productivity of this system, which supports several commercial target species, such as hake, mackerel and anchovy, among others , Bezzi 2000.…”

Section: Introductionmentioning

confidence: 99%

“…The most conspicuous feature in the Patagonian coastal area is the development during spring and summer of a tidal front that extends from 42° to 45°S, north from Peninsula Valdés to Camarones Bay. Its middle position is oriented NE-SW, closely following the isobaths of 75-80 m (Sabatini and Martos 2002). High tidal dissipation rates generate strong vertical mixing in near shore waters that can homogenize the entire water column.…”

Section: Introductionmentioning

confidence: 99%

Potential zooplankton preys (Copepoda and Appendicularia) for <i>Engraulis anchoita</i> in relation to early larval and spawning distributions in the Patagonian frontal system (SW Atlantic Ocean)

et al. 2011

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SUMMARY:We investigated the spatial distribution of the abundance, biomass and size of zooplankton (nauplii, calanoids, cyclopoids and appendicularians) in relation to the distribution of first-feeding larvae and eggs of Engraulis anchoita across the frontal system of Peninsula Valdés. Twelve samples of zooplankton and ichthyoplankton were taken with small Bongo (67 µm) and Pairovet (200 µm) nets during the spring of 2004 along two transects. The total abundance of zooplankton and the chlorophyll a concentration were higher in homogeneous waters, while total biomasses were higher in stratified waters. Temperature was negatively correlated with biological variables and was the main factor affecting the zooplankton distribution. In both transects, abundance peaks of first-feeding larvae were detected at coastal stations along with the smallest fraction of zooplankton (<500 µm), while the largest fraction was dominant at the external stations, coinciding with the highest egg abundance. The physical structure of this front generates different levels of food availability for first-feeding larvae. Calanoids (southern transect) and cyclopoids (northern transect) are predominant followed by nauplii and appendicularians. The biomass of zooplankton preys contributes to the carbon transfer to the upper trophic levels and is probably important for the survival and growth of anchovy larvae in this frontal system. Keywords: southwestern Atlantic Ocean, North Patagonian frontal system, copepods, appendicularians, zooplanktonanchovy linkage.RESUMEN: Potenciales presas zooplanctónicas (Copepoda y Appendicularia) para Engraulis anchoita en relación con las distribuciones de larvas tempranas y de desove en la región frontal patagónica (océano Atlán-tico sudoccidental). -Se investigó la distribución espacial de la abundancia, biomasa y las tallas del zooplancton (nauplii, calanoideos, ciclopoideos y apendicularias) en relación con la distribución de las larvas en estadio de primera alimentación y los huevos de Engraulis anchoita en el sistema frontal de Península Valdés. Se tomaron 12 muestras de zooplancton e ictioplancton durante la primavera de 2004 a lo largo de dos transectos, mediante una red Minibongo (67 µm) y una Pairovet (200 µm) respectivamente. La abundancia total del zooplancton y la concentración de clorofila fue mayor en aguas homogéneas, mientras que la biomasa fue mayor en aguas estratificadas. La temperatura se correlacionó negativamente con las variables biológicas siendo ésta el principal factor que afectó la distribución del zooplancton. En las estaciones costeras de ambos transectos, se encontró la mayor abundancia de larvas en coincidencia con la fracción más pequeña de zooplancton (<500 µm), mientras que la fracción más grande fue dominante en las estaciones externas, en coincidencia con la mayor abundancia de huevos. La estructura física de este frente genera diferente disponibilidad de alimento para las larvas siendo los calanoideos (transecto sur) y los ciclopoideos (transecto norte) predominantes, seguid...

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“…Differences in primary productivity can change the zooplankton distribution, as can temperature changes (Spinelli 2012), for example by an influence on the relative abundance of copepods and appendicularians. In one reported instance, massive blooms of gelatinous zooplankton occurred when the water temperature rose by 28C, rendering the tidal fronts off Patagonia less prominent and depressing copepod populations (Sabatini & Martos 2002). Much work remains to be done in order to understand bottom-up effects in this ecosystem, and put them into perspective with top-down effects due to the massive fisheries.…”

Section: Patagonian Shelf Lmementioning

confidence: 99%

Impacts of climate variation and potential effects of climate change on South American seabirds – a review

Quillfeldt

Masello

2013

Marine Biology Research

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The coastal and oceanic waters around the South American coasts provide rich foraging grounds for breeding and wintering seabirds, but there is growing concern that climate change will provide additional pressures to the seabirds around South America. As in many other coastal ecosystems, seabirds around South America are already faced with threats to their breeding habitats such as human disturbance and introduced predators, and threats at sea such as persistent pollutants and pesticides and direct mortality risks due to fisheries and oil spills. The sensitivity of South American marine ecosystems to ocean climate anomalies is well known from the dramatic population collapses caused by El Niñ o Southern Oscillation (ENSO) events. However, longer-term climate change effects have been explored less often and few long-term data sets exist for South American seabirds. Seven Large Marine Ecosystems (LME) border South America. While all LMEs experienced warming during the last 50 years, their climate dynamics have differed in recent decades. Climate models suggest that potential climate change effects may be important, especially due to changes in ENSO intensity and frequency and associated changes in the ocean climate of Atlantic and Pacific marine ecosystems. In this review, we found that the best studied seabird communities are those of the Patagonian Shelf and the Humboldt Current, but overall, our knowledge on climate effects on South American seabirds is scarce.

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Mesozooplankton features in a frontal area off northern Patagonia (Argentina) during spring 1995 and 1998

Cited by 92 publications

References 36 publications

Variação temporal do zooplâncton da Praia de Tramandaí, Rio Grande do Sul, com ênfase em Copepoda

Variação temporal do zooplâncton da Praia de Tramandaí, Rio Grande do Sul, com ênfase em Copepoda

Potential zooplankton preys (Copepoda and Appendicularia) for <i>Engraulis anchoita</i> in relation to early larval and spawning distributions in the Patagonian frontal system (SW Atlantic Ocean)

Impacts of climate variation and potential effects of climate change on South American seabirds – a review

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