Copepod distribution in surface waters of the Drake Passage using Continuous Plankton Recorder and a Pump-Net onboard system

Abstracts

There is no single instrument that can sample quantitatively the complete spectrum of pelagic organisms, or even all the components of zooplankton. Mesh size is the main factor affecting species selectivity in the Continuous Plankton Recorder (CPR), implying a need to use multiple net systems to fully characterize a community. The spatial distribution of copepod communities in the water masses of the western and eastern sectors of Drake Passage were studied using, respectively, a CPR and a Pump Net onboard system. For this purpose, and assuming that copepod community size structures of each of the three water masses were similar in both the sectors studied, the possibility of complementing CPR results using a Pump-Net onboard system was evaluated. The latter system allows the estimation of absolute abundances and has the advantage of solving two problems associated with CPR, namely mesh clogging and low catching efficiency. The contribution of the nauplius forms and species accurately identified with both samplers was analyzed. Although Oithona similis dominated both communities, in the western sector small species made a greater contribution than Calanus simillimus, the opposite being true for the eastern sector. Nauplii and early copepodite stages of O. similis were missing from the CPR samples and represented between 69 and 79% of total copepod communities, whereas small calanoid copepods, C. simillimus copepodites and later stages of O. similis were inaccurately sampled by the CPR and represented between 14 and 18% of the copepod community. Hence, the Pump Net sampler is useful for complementing the semi-quantitative information of the CPR and for its calibration.

Copepod; Continuous Plankton Recorder; Pump Net sampler; Drake Passage; Southern Ocean

Não há um único instrumento que possa efetuar uma amostragem quantitativa completa para o espectro de organismos pelágicos, ou mesmo, para todos os componentes do zooplâncton. O tamanho da malha é o principal fator que afeta a seletividade de espécies no Registro Contínuo de Plâncton (CPR). Neste trabalho, estudamos a distribuição espacial das comunidades da copépode nas massas de água registradas nos setores ocidentais e orientais da Passagem de Drake, usando um CPR e um equipamento de amostragem que consiste em uma bomba de sucção instalada a uma rede de malha de 20 µm, respectivamente. Para este fim, e supondo que o tamanho das estruturas da comunidade de Copépodes de cada uma das três massas de água são similares em ambos setores estudados, foi avaliada a possibilidade de complementar resultados obtidos com o uso de CPR usando à bordo o sistema de bomba de sucção-rede. Este sistema permite a avaliação da abundância absoluta e possui a vantagem de resolver dois problemas associados à CPR, que são o assoreamento da rede e a baixa eficiência de captura. A contribuição das formas nauplius e das espécies identificadas com os dois amostradores, foram analisadas. Embora Oithona similis dominasse ambas as comunidades no setor ocidental, pequenas espécies de calanóides apresentaram contribuição mais elevada do que Calanus simillimus, enquanto o inverso foi verdadeiro para o setor oriental. Nauplii e estágios iniciais de copepoditos de O. similis faltaram nas amostras de CPR e representaram entre 69-79% das comunidade total de copépode, enquanto as densidades de pequenos calanódes e copepoditos de C. simillimus e estágios posteriores do O. similis foram imprecisamente estimadas por meio de CPR e representaram entre 14 e 18% da comunidade copépodes. Portanto, o sistema de bomba de sucção-rede é útil para complementar informações semi-quantitativas de CPR e sua calibração.

Copépodos; densidade; Registro Contínuo de Plâncton; sistema bomba de sucção; Passagem de Drake; Oceano Antártico

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Publication Dates

• Publication in this collection
  30 Oct 2012
• Date of issue
  Sept 2012

History

• Received
  26 Oct 2011
• Accepted
  14 Aug 2012
• Reviewed
  22 July 2012