Deep-water Hydromedusae from the Lacaze-Duthiers submarine canyon (Banyuls, northwestern Mediterranean) and description of two new genera, &lt;i&gt;Guillea&lt;/i&gt; and &lt;i&gt;Parateclaia&lt;/i&gt;

Bouillon, Jean; Pagès, Francesc; Palanqués, Albert; Puig, Pere; Heussner, Serge

doi:10.3989/scimar.2000.64s187

Cited by 13 publications

(15 citation statements)

References 12 publications

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“…asteroides , the Mediterranean counterpart of P . polaris [16, 17, 59, 60]. The ecological and oceanographic features that facilitate the concentration of medusan fauna in submarine canyons and subpolar fjords may therefore explain why we observe a relatively higher richness and abundance of benthopelagic medusae in these unique ocean habitats compared to the generic deep sea.…”

Section: Discussionmentioning

confidence: 91%

High Abundance of the Epibenthic Trachymedusa Ptychogastria polaris Allman, 1878 (Hydrozoa, Trachylina) in Subpolar Fjords along the West Antarctic Peninsula

et al. 2017

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Medusae can be conspicuous and abundant members of seafloor communities in deep-sea benthic boundary layers. The epibenthic trachymedusa, Ptychogastria polaris Allman, 1878 (Hydrozoa: Trachylina: Ptychogastriidae) occurs in the cold, high latitude systems of both the northern and southern hemispheres, with a circumpolar distribution in Arctic and sub-Arctic areas, and disjunct reports of a few individuals from Antarctica. In January-February 2010, during benthic megafaunal photosurveys in three subpolar fjords along the West Antarctic Peninsula (Andvord, Flandres and Barilari Bays), P. polaris was recorded in Antarctic Peninsula waters. The trachymedusa, identified from megacore-collected specimens, was a common component of the epifauna in the sediment floored basins at 436–725 m depths in Andvord and Flandres Bays, reaching densities up to 13 m-2, with mean densities in individual basins ranging from 0.06 to 4.19 m-2. These densities are 2 to 400-fold higher than previously reported for P. polaris in either the Arctic or Antarctic. This trachymedusa had an aggregated distribution, occurring frequently in Andvord Bay, but was often solitary in Flandres Bay, with a distribution not significantly different from random. Epibenthic individuals were similar in size, typically measuring 15–25 mm in bell diameter. A morphologically similar trachymedusa, presumably the same species, was also observed in the water column near the bottom in all three fjords. This benthopelagic form attained abundances of up to 7 m-2 of seafloor; however, most P. polaris (~ 80%), were observed on soft sediments. Our findings indicate that fjords provide a prime habitat for the development of dense populations of P. polaris, potentially resulting from high and varied food inputs to the fjord floors. Because P. polaris resides in the water column and at the seafloor, large P. polaris populations may contribute significantly to pelagic-benthic coupling in the WAP fjord ecosystems.

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Section: Discussionmentioning

confidence: 91%

High Abundance of the Epibenthic Trachymedusa Ptychogastria polaris Allman, 1878 (Hydrozoa, Trachylina) in Subpolar Fjords along the West Antarctic Peninsula

et al. 2017

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“…Inside the canyon, copepods and non-copepod Crustacea were less abundant during the winter. The hydromedusae Parateclaia euromarge (Bouillon et al, 2000) appeared as the second contributor to the dissimilarity among seasons in BC, being more abundant in summer and absent in winter and autumn. Moreover, the polychaete larvae in BC showed the highest abundance in summer, but were also present in winter with a slightly lower abundance.…”

Section: Swimmersmentioning

confidence: 99%

“…Several studies focusing on swimmers found in sediment traps have been recently carried out in the Mediterranean Sea, mainly within the frame of geological studies. In terms of biodiversity, these studies lead both to the description of new species, genera, and even families, of cnidarians and polychaetes, as well as to the re-description of other species based on the analysis of new morphological features (Gili et al, 1998(Gili et al, , 1999(Gili et al, , 2000Sardá et al, 2009, Sevastou et al, 2012. Others revealed that canyons in the North Western Mediterranean Sea host unique and specific hydromedusa populations (Bouillon et al, 2000;Gili et al, 1999Gili et al, , 2000.…”

Section: Introductionmentioning

confidence: 99%

“…In terms of biodiversity, these studies lead both to the description of new species, genera, and even families, of cnidarians and polychaetes, as well as to the re-description of other species based on the analysis of new morphological features (Gili et al, 1998(Gili et al, , 1999(Gili et al, , 2000Sardá et al, 2009, Sevastou et al, 2012. Others revealed that canyons in the North Western Mediterranean Sea host unique and specific hydromedusa populations (Bouillon et al, 2000;Gili et al, 1999Gili et al, , 2000. The relevance of these studies is high, specially considering that most of them were carried out in submarine canyons, where sampling with traditional devices is always difficult (Gili et al, 1999).…”

Section: Introductionmentioning

confidence: 99%

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Canyon effect and seasonal variability of deep-sea organisms in the NW Mediterranean: Synchronous, year-long captures of “swimmers” from near-bottom sediment traps in a submarine canyon and its adjacent open slope

Romano

Flexas

Segura

et al. 2017

Deep Sea Research Part I: Oceanographic Research Papers

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Numerous organisms, including both passive sinkers and active migrators, are captured in sediment traps together with sediments. By capturing these "swimmers", the traps become an extraordinarily tool to obtain relevant information on the biodiversity and dynamics of deep-sea organisms. Here we analyze near-bottom swimmers larger than 500 µm and their fluxes collected from eight near-bottom sediment traps installed on instrumented moorings deployed nearby Blanes Canyon (BC). Our data, obtained from November 2008 to October 2009 with a sampling rate of 15 days, constitutes the first year-long, continuous time series of the whole swimmers' community collected at different traps and bottom depths (from 300 m to 1800 m) inside a submarine canyon and its adjacent open slope (OS). The traps captured 2155 specimens belonging to 58 taxa, with Crustacea (mainly Copepoda) and Annelida Polychaeta accounting for more than 90% of the total abundance. Almost half of the identified taxa (31) were only present in BC traps, where mean annual swimmer fluxes per trap were almost one order of magnitude higher than in the OS ones. Temporal variability in swimmer fluxes was more evident in BC than in OS. Fluxes dropped in winter (in coincidence with the stormy period in the region) and remained low until the following spring. In spring, there was a switch in taxa composition, including an increase of planktonic organisms. Additionally, we report drastic effects of extreme events, such as major storms, on deep-sea fauna. The impact of such extreme events along submarine canyon systems calls to rethink the influence of climate-driven phenomena on deep-sea ecosystems and, consequently, on their living resources.

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“…Earleria antoniae (Foersteria antoniae: Gili et al, 1998;Bouillon et al, 2000) and Earleria araiae (Foersteria araiae: Gili et al, 1999;Bouillon et al, 2000) were reported from canyons in the Mediterranean sea. Earleria purpurea (Foersteria purpurea : Mackie, 1985;Larson et al, 1992) were reported as one of the benthopelagic species present in fjords of British Columbia in the 50-450 m depth strata, and deeper than 200 m depth in Monterey Bay.…”

Section: Earleria Bruunimentioning

confidence: 99%

Comparative ROV surveys reveal jellyfish blooming in a deep-sea caldera: the first report of Earleria bruuni from the Pacific Ocean

Hidaka

Lindsay

2017

J. Mar. Biol. Ass.

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Large numbers of the leptomedusa Earleria bruuni were observed inside a semi-closed deep-sea caldera during a comparative survey of the macrozooplankton fauna inside and outside the Kurose Hole, Izu-Ogasawara Islands, by the remotely operated vehicle (ROV) 'Dolphin-3K', on 24 September 2000. The Kurose Hole is an inactive volcanic caldera of 790 m bottom depth, located within the Izu-Bonin island arc, south of Tokyo. Archived video and audio data from a dive by the human-occupied vehicle (HOV) 'Shinkai 2000', carried out 3 weeks after the ROV dives, was also analysed. During all dives within the caldera, E. bruuni was present in large numbers and, during the HOV dive, two specimens for morphological analysis were obtained. Herein, we report E. bruuni from the Pacific Ocean for the first time. The vertical profiles of environmental factors and the vertical distributions of gelatinous macrozooplankton taxa such as salps, ctenophores, hydromedusae, siphonophores and scyphomedusae, were extremely different inside and outside the caldera. Inside the caldera the water temperatures were warm and dissolved oxygen levels were high compared with outside. For each taxon, their distributions were characterized and compared between the inside and outside of the caldera, and with previous literature reports.

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Deep-water Hydromedusae from the Lacaze-Duthiers submarine canyon (Banyuls, northwestern Mediterranean) and description of two new genera, <i>Guillea</i> and <i>Parateclaia</i>

Cited by 13 publications

References 12 publications

High Abundance of the Epibenthic Trachymedusa Ptychogastria polaris Allman, 1878 (Hydrozoa, Trachylina) in Subpolar Fjords along the West Antarctic Peninsula

High Abundance of the Epibenthic Trachymedusa Ptychogastria polaris Allman, 1878 (Hydrozoa, Trachylina) in Subpolar Fjords along the West Antarctic Peninsula

Canyon effect and seasonal variability of deep-sea organisms in the NW Mediterranean: Synchronous, year-long captures of “swimmers” from near-bottom sediment traps in a submarine canyon and its adjacent open slope

Comparative ROV surveys reveal jellyfish blooming in a deep-sea caldera: the first report of Earleria bruuni from the Pacific Ocean

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