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28 results for “deep-water gorgonians”
Fig. 1 in New species of deep-water Calcigorgia gorgonians (Anthozoa: Octocorallia) from the Sea of Okhotsk, with a re-diagnosis and a taxonomic review of the genus
Fig. 1. Calcigorgia herba sp. nov. A. Holotype MIMB 20744, Kurile Islands, Sea of Okhotsk. B. Paratype MIMB 20745, Kurile Islands, Sea of Okhotsk. C. One specimen, Kurile Islands, Sea of Okhotsk, MIMB 20709. D–E. Two specimens, Kurile Islands, Sea of Okhotsk, MIMB 20748. F. Terminal polyps, holotype MIMB 20744. G. Terminal polyps, paratype MIMB 20745. Scale bars: A–E = 20 mm; F–G = 10 mm.
Fig. 6 in New species of deep-water Calcigorgia gorgonians (Anthozoa: Octocorallia) from the Sea of Okhotsk, with a re-diagnosis and a taxonomic review of the genus
Fig. 6. Calcigorgia herba sp. nov., paratype MIMB 20745, sclerites from the polyp body wall. A. Warty clubs. B. Club-like spindles. C. Plump spindles with well-developed warts. D. Poorly developed clubs with serrated processes. E. Ovals. F. Capstan (8-radiate). Scale bar = 0.1 mm.
Data from: Early life history of deep-water gorgonian corals may limit their abundance
Deep-water gorgonian corals are long-lived organisms found worldwide off continental margins and seamounts, usually occurring at depths of ~200–1,000 m. Most corals undergo sexual reproduction by releasing a planktonic larval stage that disperses; however, recruitment rates and the environmental and biological factors influencing recruitment in deep-sea species are poorly known. Here, we present results from a 4-year field experiment conducted in the Gulf of Maine (northwest Atlantic) at depths of more than 650 m that document recruitment for 2 species of deep-water gorgonian corals, Primnoa resedaeformis and Paragorgia arborea. The abundance of P. resedaeformis recruits was high, and influenced by the structural complexity of the recipient habitat, but very few recruits of P. arborea were found. We suggest that divergent reproductive modes (P. resedaeformis as a broadcast spawner and P. arborea as a brooder) may explain this pattern. Despite the high recruitment of P. resedaeformis, severe mortality early on in the benthic stage of this species may limit the abundance of adult colonies. Most recruits of this species (more than 80%) were at the primary polyp stage, and less than 1% of recruits were at stage of 4 polyps or more. We propose that biological disturbance, possibly by the presence of suspension-feeding brittle stars, and limited food supply in the deep sea may cause this mortality. Our findings reinforce the vulnerability of these corals to anthropogenic disturbances, such as trawling with mobile gear, and the importance of incorporating knowledge on processes during the early life history stages in conservation decisions.
Data from: Early life history of deep-water gorgonian corals may limit their abundance
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Fig. 13 in New species of deep-water Calcigorgia gorgonians (Anthozoa: Octocorallia) from the Sea of Okhotsk, with a re-diagnosis and a taxonomic review of the genus
Fig. 13. Map of the distribution of the Calcigorgia gorgonians. The regions of Calcigorgia species collection (based on the literature and data in the present paper, see explanation in the text) are marked: ► = C. beringi; + = C. gigantea; Ө = C. gracilis; ● = C. herba sp. nov.; Ǫ = С. japonica; □ = C. lukini sp. nov.; ∆ = C. matua; ▀ = C. pacifica; ▲ = C. simushiri; * = C. spiculifera; ♦ = Calcigorgia sp. Black arrows indicate the direction of the Alaskan Stream and Oyashio Current; white arrows show the direction of the Kuroshio Current.
Fig. 12 in New species of deep-water Calcigorgia gorgonians (Anthozoa: Octocorallia) from the Sea of Okhotsk, with a re-diagnosis and a taxonomic review of the genus
Fig. 12. Calcigorgia lukini sp. nov., paratype MIMB 20712, sclerites A. Capstans from polyp body wall. B. Well calcified capstans (8-radiate) from polyp body wall. C. Ovals from polyp body wall. D. Capstans (8-radiate) from the coenenchyme. Scale bar = 0.1 mm.
Fig. 11 in New species of deep-water Calcigorgia gorgonians (Anthozoa: Octocorallia) from the Sea of Okhotsk, with a re-diagnosis and a taxonomic review of the genus
Fig. 11. Calcigorgia lukini sp. nov., paratype MIMB 20712, sclerites from the tentacles. A. Warty spindles from the tentacles. B. Clubs with leafy processes. C. Asymmetrical ovals. D. Symmetrical ovals. E. Capstans (8-radiate). Scale bar = 0.1 mm.
Fig. 10 in New species of deep-water Calcigorgia gorgonians (Anthozoa: Octocorallia) from the Sea of Okhotsk, with a re-diagnosis and a taxonomic review of the genus
Fig. 10. Calcigorgia lukini sp. nov., holotype MIMB 20710, sclerites. A. Capstans from polyp body wall. B. Well calcified capstans from polyp body wall. C. Ovals from polyp body wall. D. Capstans (8-radiate) from the coenenchyme. Scale bar = 0.1 mm.
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