Surface zooplankton distribution in the Drake Passage recorded by Continuous Plankton Recorder (CPR) in late austral summer of 2000

Takahashi, Kunio; Kawaguchi, So; Hosie, Graham W.; Toda, Tatsuki; Naganobu, Mikio; Fukuchi, Mitsuo

doi:10.1016/j.polar.2009.08.004

Cited by 20 publications

(16 citation statements)

References 26 publications

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“…When considering the distribution of copepods found in Fíldes Bay in our study, and comparing it to studies reported for areas close to the South Shetland Islands, as presented by Zmijewska (1985) and Takahashi et al (2010), it is interesting to note that that within Fíldes Bay there are differences in species composition compared to the reported by the authors mentioned above. Other authors report that copepods of the genus Oithona sp.…”

Section: Discussionsupporting

confidence: 73%

Spatial distribution of Antarctic copepods in Fíldes Bay during summer of 2012

Lagos

Manríquez

2014

Rev. biol. mar. oceanogr.

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Resumen.-La Península Antártica Chilena, se caracteriza por ser estable en su condición oceanográfica, sin embargo sus zonas costeras como bahías pueden presentar condiciones físicas variables tanto espacial como temporalmente. Se ha señalado que existe una importante interacción entre las condiciones oceanográficas y patrones de distribución espacial del zooplancton, sin embargo, no existe mayor evidencia acerca de cómo esta interacción afecta la distribución horizontal y vertical del zooplancton que habita estas zonas. El presente estudio muestra evidencias de los cambios que ocurren a nivel de estructura comunitaria del zooplancton, específicamente en el ensamble de copépodos al inte rior de Bahía Fíldes. Los resultados muestran que copépodos de la familia Oithonidae son abundantes en zonas costeras de la bahía mientras que copépodos de la familia Calanidae son abundantes en zonas contiguas al Estrecho Bransfield encontrándose en escasa abundancia al interior de la bahía. Estos hallazgos indican que existen diferencias en el ensamble de copépodos a lo largo de la bahí a con cambios en términos de abundancia y distribución de grupos dominantes enc ontrados comúnmente en la Península Antártica y aguas cercanas al paso Drake. Palabras clave: Península Antártica, Bahía Fíldes, copépodos, distribuciónAbstract.-The Antarctic Chilean peninsula, is characterized for being stable in its oceanographic conditions. Nevertheless, its coastal zones, such as bays, may have more variable physical conditions, both spatially and temporally. It has been observed that a remarkable interaction between the oceanographic conditions and spatial distribution patterns of zooplankton occurs. However, there is no good understanding of how these interactions affect the horizontal and vertical distribution of zooplankton living in these areas. The present study shows the changes that occur at the level of the zooplankton community structure, specifically in the copepods assembly of Fíldes Bay. The results show that copepods of the Oithonidae family are abundant in coastal areas of the bay meanwhile Calanidae copepods are abundant in zones adjacent to Bransfield Strait and found only in low abundance at the interior of the bay. These findings indicate differences in the ensemble of copepods along the bay with changes in the abundance and distribution of dominant groups of copepods commonly found in the Antarctic Peninsula and Drake Passage waters.

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Section: Discussionsupporting

confidence: 73%

Spatial distribution of Antarctic copepods in Fíldes Bay during summer of 2012

Lagos

Manríquez

2014

Rev. biol. mar. oceanogr.

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“…Moreover, although data from CPR sampling indicate that O. similis is abundant in Antarctic and Subantarctic waters, it cannot be quantified because the efficiency of retention (mean: 30%) changes with copepod length (Batten et al 2003;Pinkerton et al 2010). On the other hand, nauplii comprised an average of 70% (range 26-95%) of the total copepods in this study and less than 1% in CPR studies (Takahashi et al 2010). …”

Section: Discussioncontrasting

confidence: 56%

“…The sampling distance of each station (mainly 3.5-6.5 nautical miles) is similar to that used to determine the length of each CPR silk segment for further analysis (5 nautical miles, Hunt and Hosie 2003;Takahashi et al 2010). Moreover, the 20-lm-mesh net increases the efficiency of collecting small copepods, but these pass through the 270-lm-mesh of the CPR silk; the latter, in contrast to the pump-net methodology, does not prevent clogging.…”

Section: Discussionmentioning

confidence: 99%

“…This can be exemplified with O. similis and nauplii. O. similis, which is one of the most abundant species in CPR samples (Takahashi et al 2010;McLeod et al 2010), showed a sharp decrease in absolute density to the south of the Polar Front but contributed highly to some Antarctic samples. Moreover, although data from CPR sampling indicate that O. similis is abundant in Antarctic and Subantarctic waters, it cannot be quantified because the efficiency of retention (mean: 30%) changes with copepod length (Batten et al 2003;Pinkerton et al 2010).…”

Section: Discussionmentioning

confidence: 99%

“…(5) Jr82 cruise (Ward et al 2006); (6) Oceantar I, (Ramirez and Dinofrio 1976); (7) Discovery Expedition 1927 (Hardy 1936); (8) SO-CPR Survey Tow 68/70 (Takahashi et al 2010); (*) Only total copepods were reported. b Geographic location of the stations in summer 2000 (CAV 2000), 2001(CAV 2001(CAV 2003 Samples for the study of copepods, obtained mainly with a spatial resolution of 3.5-6.5 nautical miles, were collected from 500 to 3,000 L (CAV 2000, 19 samples), 400-600 L (CAV 2001, 21 samples) and 80-200 L (CAV 2003, 16 samples) of seawater filtered through a 20-lm mesh and fixed in 3% formol solution.…”

Section: Methodsmentioning

confidence: 99%

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Interannual fluctuations in copepod abundance and contribution of small forms in the Drake Passage during austral summer

2011

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The relative importance of small forms of copepods has been historically underestimated by the traditional use of 200-300-lm mesh nets. This work quantified the distribution and abundance of copepods, considering two size fractions (\300 lm and[300 lm), in superficial waters (9 m deep) of the Drake Passage and contributed to the knowledge of their interannual fluctuations among three summers. Four types of nauplii and eleven species of copepods at copepodite and adult stages were identified, with abundance values of up to 13 ind L -1 and 28,300 lg C m -3 . The\300-lm fraction, composed of Oithona similis, small cyclopoids and nauplii, dominated the copepod communities in the 3 years; it accounted for more than 77% of the total number and for between 40 and 63% of the total biomass. Changes in density and biomass values among the three cruises differed according to copepod size fraction and water mass; the [300-lm fraction showed no changes among the 3 years, both in Antarctic (density and biomass) and in Subantarctic waters (density), whereas the \300-lm fraction showed higher (density and biomass) values in 2001 both in Subantarctic and in Antarctic waters. Sea surface temperature and its anomaly accounted for the largest proportion of variability in copepod density and biomass, particularly for the\300-lm fraction.

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