Spatio-temporal distribution of Oithona similis in the Bornholm Basin (Central Baltic Sea)

Hansen, Frank C; Möllmann, Christian; Schütz, Ulrike; Hinrichsen, Hans‐Harald

doi:10.1093/plankt/fbh061

Cited by 40 publications

(47 citation statements)

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“…Oithona spp. have been described to have year-round presence (Hansen et al 2004) and reproductive activity (Nielsen & Sabatini 1996, Ward & Hirst 2007, and it has been argued that these copepods can exploit microbial food webs more efficiently than calanoid copepods (Nielsen & Sabatini 1996), characteristics that make Oithona spp. populations more stable in time and space than those of calanoid copepods (Paffenhöfer 1993).…”

Section: Resale or Republication Not Permitted Without Written Consenmentioning

confidence: 99%

Plankton community structure and role of Oithona similis on the western coast of Greenland during the winter-spring transition

Zamora-Terol¹,

Nielsen²,

Saiz³

2013

Mar. Ecol. Prog. Ser.

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The cyclopoid copepod Oithona similis is one of the most abundant copepods in the oceans and has a potentially important role in pelagic food webs. However, there is a lack of knowledge on aspects of its biology and function in planktonic communities. In the present study, we aimed to assess and compare the species' trophic role in Greenlandic coastal waters during the winter-spring transition, with a focus on its winter behaviour, when large calanoids are not present in the surface layer. Two locations were studied: waters offshore from Godthåbsfjord (Nuuk) in winter, and Qeqertarsuaq (Disko Bay) in spring (bloom and post-bloom period). The potential prey of adult females of O. similis was quantified, and grazing experiments were conducted to determine the feeding rates of adult females on phytoplankton and protozooplankton >10 μm. The abundance, stage composition, and egg production of O. similis was also investigated. Ciliates were the preferred prey for O. similis, which confirms its importance as a link between the microbial food web and higher trophic levels. We observed high egg production rates and efficiencies of O. similis in winter, confirming that it is active and successfully reproductive in food-limited winter conditions. Our results stress that O. similis is a key component of Arctic and subarctic marine communities throughout the year.KEY WORDS: Oithona similis · Trophic role · Egg production · Greenland · Winter · Bloom · Arctic Resale or republication not permitted without written consent of the publisherMar Ecol Prog Ser 483: [85][86][87][88][89][90][91][92][93][94][95][96][97][98][99][100][101][102] 2013 of Greenland (Head et al. 2003, Thor et al. 2005, Madsen et al. 2008, and within the genus, Oithona similis is a cosmopolitan species. Oithona spp. have been described to have year-round presence (Hansen et al. 2004) and reproductive activity (Nielsen & Sabatini 1996, Ward & Hirst 2007, and it has been argued that these copepods can exploit microbial food webs more efficiently than calanoid copepods (Nielsen & Sabatini 1996), characteristics that make Oithona spp. populations more stable in time and space than those of calanoid copepods (Paffenhöfer 1993). Consequently, Oithona spp. could be important food sources for fish larvae and larger zooplankton, especially in those periods of the year when other potential prey are not available.Regarding Arctic marine environments, only few studies on the biology of Oithona spp. have been published , Ward & Hirst 2007, Madsen et al. 2008, Narcy et al. 2009), and even less is known about their feeding ecology. It has been reported that Oithona similis prefer motile prey, especially ciliates (Nakamura & Turner 1997, Lonsdale et al. 2000, Castellani et al. 2005a, although many aspects of their natural diet are still unknown. Thus, our knowledge on their feeding activity in winter in high-latitude environments is almost nonexistent since most of the studies have focused on more productive periods of the year (Atkinson 1996, Møller et al. 2006...

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Section: Resale or Republication Not Permitted Without Written Consenmentioning

confidence: 99%

Plankton community structure and role of Oithona similis on the western coast of Greenland during the winter-spring transition

Zamora-Terol¹,

Nielsen²,

Saiz³

2013

Mar. Ecol. Prog. Ser.

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“…The horizontal distribution of salinity was studied to locate the maximum gradients for that year. Surface water samples were collected at each sampling station for estimation of chlorophyll a concentration, using the method of HOLM-HANSEN et al (1965).…”

Section: Main Hydrographic Features Of the Study Areamentioning

confidence: 99%

“…Copepods are generally considered the most important metazoan secondary producers in pelagic marine ecosystems and they constitute an important link in the food chain, coupling protists to higher trophic levels (HOPCROFT; HANSEN et al, 2004). A substantial proportion of the copepod assemblage is composed of small-sized species, which generally dominate the mesozooplankton not only in terms of abundance, but also in terms of biomass (GALLIENNE;ROBINS, 2001;TURNER, 2004 and references therein;VIDJAK et al, 2006).…”

Section: Introductionmentioning

confidence: 99%

“…There are many examples in the literature indicating that small copepods and appendicularians are important prey for fish in their different ontogenetic stages (HUNTER; ALHEIT, 1995;RAMÍREZ, 1996;HANSEN et al, 2004;PURCELL et al, 2004;TAKATSU et al, 2007). Large shoals of Engraulis anchoita concentrate off Buenos Aires province during the spring spawning period but their highest spawning intensity occurs on the Río de la Plata estuarine front MADIROLAS, 1996;MARTOS et al, 2005;PAJARO, 2008).…”

Section: Introductionmentioning

confidence: 99%

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Capture efficiency for small dominant mesozooplankters (Copepoda, Appendicularia) off Buenos Aires Province (34ºS-41ºS), Argentine Sea, using two plankton mesh sizes

2009

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A B S T R A C TTwo plankton mesh sizes of 67 µm and 220 µm were compared to evaluate their efficiency in the capture of the smallest copepods and appendicularians present in the Buenos Aires coastal area (Argentine Sea). A total of 12 copepod species and one appendicularian species were recorded in this study. The copepods were separated into 4 groups: harpacticoids, cyclopoids, small calanoids and large calanoids and their developmental stages. Among the cyclopoids, Oithona nana was the most abundant species, being 96.29 % underestimated by the 220 µm mesh, whereas Microsetella norvegica dominated the harpacticoids and was captured exclusively by the smaller mesh. Similar results were found for copepodites I-III of small calanoids, whose net sampled underestimation reached 99.70%. On the other hand, no significant difference between meshes was found for adults and copepodites IV-V of small calanoids or any of the developmental stages of large calanoids. A great loss of biomass was observed for O. nana when applying the larger mesh. In regards to the appendicularian Oikopleura dioica, all size ranges below 1,000 µm length were better estimated by the 67 µm mesh in terms of abundance and biomass. Our results clearly show that the 67 µm mesh was more efficient in the capture of early stages of small copepods thus providing a more accurate estimation of the fish larvae prey field. R E S U M OCompararam-se os copépodos e apendiculárias coletados, na zona costeira do Estado de Buenos Aires (Argentina), com duas redes de plâncton, tipo mini-bongo, de abertura de malha de 67 µm e 220 µm. Registraram-se 12 espécies de copépodos e uma de apendiculária. Os copépodos foram separados de acordo com as categorias: harpaticoides, ciclopoides, e calanoides pequenos e grandes. O cálculo da abundância de Oithona nana, que foi a espécie mais abundante no material analizado, demonstrou que a coleta com rede de 220 µm teve uma subestimativa de 92,29%, em relação à coleta com a rede de 67 µm, o que resultou numa alta perda de biomassa, dessa espécie, quando usada a rede de 220 µm. Outro dado relevante, foi a dominância de Microsetella norvegica, dentro dos harpaticoides, e a presença da mesma somente no material coletado com a rede de 67 µm. De igual forma, quando se analisou a abundância dos copepoditos I-III dos pequenos calanoides, a rede de 220 µm demonstrou uma subestimativa de 99,70%, em comparação com a rede de 67 µm. Não foram encontradas diferenças significativas na coleta de adultos e copepoditos IV-V dos pequenos calanóides e todos estagios grandes calanóides. Para as apendiculárias, no que diz respeito à abundância e biomassa, as variações de tamanho menores que 1,000 µm, foram melhor estimadas com a malha de 67 µm. Os resultados demonstraram que a malha de 67 µm foi mais eficiente na coleta dos ciclopoides e dos primeiros estágios de copepoditos dos pequenos calanoides, que por sua vez, constituem a principal fonte de alimento para as larvas de teleostei na área analisada.

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“…Zooplankton was collected using a multinet (Hydrobios, Kiel, 0.25 m 2 mouth opening, 50 μm mesh size) in stacked, 10-m intervals from bottom to surface. As diel vertical migration is not pronounced in the Central Baltic Sea (e.g., Hansen et al, 2004Hansen et al, , 2006Renz and Hirche, 2006) samples were taken regardless of the time of day. A total of 146 samples was preserved immediately after collection in boraxbuffered 4% formalin-seawater solution.…”

Section: Samplingmentioning

confidence: 99%

Vertical zonation of the zooplankton community in the Central Baltic Sea in relation to hydrographic stratification as revealed by multivariate discriminant function and canonical analysis

Schulz

Möllmann²,

Hirche

2007

Journal of Marine Systems

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The vertical zonation of zooplankton in a deep central Baltic Sea basin was studied in relation to hydrography based on vertically resolved sampling. The study period covered different seasonal hydrographic conditions as well as inflow events of water masses from the North Sea, important for the physical condition of this marginal sea. By means of multivariate discriminant function and canonical analysis, we show a distinct vertical zonation of the zooplankton community in the water column. Three main habitats, which reflect the hydrographic situation, were identified with distinct differences in zooplankton composition: (1) the summer surface layer, bound by the thermocline at its lower rim; species inhabiting this layer are only seasonally abundant or forced to adjust to the cooler winter water; (2) the intermediate winter water, bound by the halocline from below and the thermocline or surface as the upper boundary; species dwelling in this layer face a reduced volume and are cut off from the high primary production when their habitat is limited from above by the summer thermocline; (3) the layer between the permanent halocline and the seafloor; the taxonomic composition in this layer shows no significant effect in relation to the observed inflows. The consequences of this zonation for trophodynamic interrelationships and advection processes are discussed.

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Spatio-temporal distribution of Oithona similis in the Bornholm Basin (Central Baltic Sea)

Cited by 40 publications

References 34 publications

Plankton community structure and role of Oithona similis on the western coast of Greenland during the winter-spring transition

Plankton community structure and role of Oithona similis on the western coast of Greenland during the winter-spring transition

Capture efficiency for small dominant mesozooplankters (Copepoda, Appendicularia) off Buenos Aires Province (34ºS-41ºS), Argentine Sea, using two plankton mesh sizes

Vertical zonation of the zooplankton community in the Central Baltic Sea in relation to hydrographic stratification as revealed by multivariate discriminant function and canonical analysis

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