The ecology of colonial radiolarians : their colony morphology, trophic interactions and associations, behavior, distribution, and the photosynthesis of their symbionts

Swanberg, Neil R.

doi:10.1575/1912/2214

Cited by 35 publications

(23 citation statements)

References 26 publications

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“…For example Lampoxanthium pandora, and Sphaerozooum punctatum differentiate within their colonies some areas where faecal remains are stored [Swanberg, 1979 ;Anderson, 1983]. Often colonies share the ectoplasmic part of their cell that includes numerous spicules.…”

Section: Origin Of Complex Skeleton Forms In Radiolariamentioning

confidence: 99%

Diversity of radiolarian families through time

Wever

O’Dogherty

Caridroit

et al. 2003

Bulletin De La Société Géologique De France

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Abstract. -The examination of radiolarian biodiversity at the family level through Phanerozoic time reveals some general trends known in other groups of organisms, especially among plankton, while some other trends seem to be quite peculiar. The Permian /Triassic crisis that is one of the most important in the evolution of marine organisms, is marked in radiolarian assemblages by the extinction of two orders (Albaillellaria and Latentifistularia) towards the end of the Permian, and mostly by the tremendous diversification of Spumellaria and Nassellaria in the early-mid Triassic. Radiolarian diversity increased from Cambrian to Jurassic, remained quite stable during the Cretaceous and has decreased slightly since then. Diversité des familles de radiolaires au cours du tempsMots clés. -Radiolaires, Famille, Diversité, Paléozoïque, Mésozoïque, Cénozoïque, Extinction, Radiation, Protoctistes.Résumé. -L'examen de la biodiversité des radiolaires, au niveau de la famille au cours du Phanérozoïque révèle quelques tendances générales connues chez d'autres groupes d'organismes, surtout dans le plancton, alors que d'autres tendances leur sont particulières. La crise permo-triasique, l'une des plus importantes dans l'évolution des organismes marins, est marquée chez les radiolaires par l'extinction de deux familles (Albaillellaria et Latentifistularia) vers la fin du Permien, mais surtout par une énorme diversification des spumellaires et nassellaires au Trias inférieur et moyen. La diversité des radiolaires s'accroît du Cambrien au Jurassique, reste relativement stable au Crétacé et décroît légèrement depuis.

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Section: Origin Of Complex Skeleton Forms In Radiolariamentioning

confidence: 99%

Diversity of radiolarian families through time

Wever

O’Dogherty

Caridroit

et al. 2003

Bulletin De La Société Géologique De France

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“…By carefully removing and examining the material taken from net hauls before preservation, however, they can be sampled quantitatively; there have been numerous quantitative net studies of gelatinous predators in coastal waters. There have been sporadic efforts to count gelatinous zooplankton in situ (Alldredge 1972;Swanberg 1974Swanberg ,1979Swanberg ,1983Hamner et al 1975;Harbison et al 1978;Biggs et al 1981Biggs et al , 1987 and to count them remotely (Kremer & Nixon 1976) or even from the deck of a ship (Hamner & Schneider 1986). Most of the reports to date of the abundances of gelatinous predators have been based on net samples (Fraser 1970;Greve 1971;Anderson 1974;Hirota 1974;Larson 1986), sometimes including data on gut contents (Fraser 1970;Anderson 1974;Larson 1987).…”

Section: Introductionmentioning

confidence: 99%

Ctenophora in the Arctic: the abundance, distribution and predatory impact of the cydippid ctenophore Mertensia ovum (Fabricius) in the Barents Sea

Swanberg

Båmstedt

1991

Polar Research

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The Ctenophora Mertensia ouum and Beroe cucumis, collected using both conventional sampling gear and scuba divers, were studied in the Barents Sea east of Bjorndya and North Norway in spring 1987 and summer 1988. Among the gelatinous zooplankton, Mertensia ouum was the most consistently abundant copepod predator.Feeding experiments were conducted to evaluate the predation rate of M . ouum in various trophic regimes. This ctenophore can take prey varying in size from small copepods to amphipods and krill. but gut-content analyses from field-collected specimens as well as experimental results showed that the main food source for adults was large-sized copepods (e.g. Calanus finmarchicus. C. gLacialis. C. hyperboreus.Metridia longa). The robust tentacle arrray of M. ouum makes this species effective as a predator on large prey. The high potential predation rate of this ctenophore relative to its estimated metabolic cost of only 1.7% of the body energy content d-' suggests that M. ovum may be able to maintain a positive energy balance even in conditions of low prey abundancc. It is suggested that a single exploitation of a zooplankton patch may provide energy for survival for a very long time.The potential impact of M. ouum on Barents Sea copepod populations is estimated on the basis of the minimal observed average daily ration in experiments and from field data on gut contents. Using abundances of copepods for the area, and the actual predator biomass collected. it was estimated that an average of 0.7% of the copepod fauna per day could fall prey to this predator.

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“…We therefore suggest simply treating them as solitary and/or colonial collodarians. Despite tremendous efforts, very little data are available to estimate the abundance of collodarians (Swanberg 1974). In situ imaging has proved to be a useful tool to quantify members of this group (Dennett et al 2002, Biard et al 2016.…”

Section: -3 Collodariamentioning

confidence: 99%

Optics-based surveys of large unicellular zooplankton: a case study on radiolarians and phaeodarians

Nakamura

Somiya

Suzuki

et al. 2017

Plankton Benthos Res

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Optics-based surveys for large unicellular zooplankton were carried out in five different oceanic areas. New identification criteria, in which radiolarian-like plankton are categorized into nine different groups, are proposed for future optics-based surveys. The autonomous visual plankton recorder (A-VPR) captured 65 images of radiolarians (three orders: Acantharia, Spumellaria and Collodaria) and 117 phaeodarians (four taxa: Aulacanthidae, Phaeosphaerida, Tuscaroridae and Coelodendridae). Colonies were observed for one radiolarian order (Collodaria) and three phaeodarian taxa (Phaeosphaerida, Tuscaroridae and Coelodendridae). The rest of the radiolarian orders (Taxopodia and Nassellaria) and the other phaeodarian taxa were not detected because of their small cell size (< ca. 400 µm).

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The ecology of colonial radiolarians : their colony morphology, trophic interactions and associations, behavior, distribution, and the photosynthesis of their symbionts

Cited by 35 publications

References 26 publications

Diversity of radiolarian families through time

Diversity of radiolarian families through time

Ctenophora in the Arctic: the abundance, distribution and predatory impact of the cydippid ctenophore Mertensia ovum (Fabricius) in the Barents Sea

Optics-based surveys of large unicellular zooplankton: a case study on radiolarians and phaeodarians

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