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| Girard, Fanny; Sarrazin, Jozee; Arnaubec, Aurelien; Cannat, Mathilde; Sarradin, Pierre-marie; Wheeler, Benjamin; Matabos, Marjolaine. |
| The deep sea is characterized by a wide range of landscapes, including complex features where topography and currents interact to form highly heterogeneous habitats. In addition to a complex topography, hydrothermal vent environments are characterized by strong environmental gradients that structure the spatial distribution of biological communities. The role of vent fluid temperature and chemical composition on species distribution is now well understood, but investigations on the effects of the complex sulfide edifice topography are scarce. Here, we used a novel approach combining 3D photogrammetric reconstruction, in situ environmental measurements and modeling to characterize assemblage distribution on the active edifice Eiffel Tower (Lucky Strike,... |
| Tipo: Text |
Palavras-chave: Mid-Atlantic Ridge; Eiffel Tower; EMSO-Azores; Ecology; Imagery; 3D photogrammetry; Deep-sea observatories; Topographic effects. |
| Ano: 2020 |
URL: https://archimer.ifremer.fr/doc/00640/75211/75349.pdf |
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| Girard, Fanny; Sarrazin, Jozee; Olu, Karine. |
| Cold seeps are widespread in the deep sea and, like other chemosynthesis-based ecosystems, often host high faunal biomass. Temporal changes at seeps have been inferred by comparing communities at different successional stages; nonetheless, temporal studies in seep ecosystems are rare. Using data collected as part of a benthic observatory, we characterized intra-annual microbial and faunal dynamics in a microbial mat habitat on the Håkon Mosby mud volcano (1256 m depth; Barents Sea), and evaluated the effects of a mud eruption on the biota. Video sequences recorded twice daily for 4.5 months with an autonomous imaging module were analyzed to quantify changes in microbial mat cover and megafaunal density and behavior. In addition, time series data for... |
| Tipo: Text |
Palavras-chave: Håkon Mosby Mud Volcano; LOOME; Arctic; Beggiatoa; Deep-sea observatories; Time series; Megafauna. |
| Ano: 2020 |
URL: https://archimer.ifremer.fr/doc/00624/73631/73069.pdf |
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| Girard, Fanny; Fisher, Charles R.. |
| Cold-water corals form high biodiversity habitats in the deep sea. They are generally long-lived, slow-growing, and thus particularly vulnerable to anthropogenic impact. We used high-definition imagery to quantify the impact and assess the recovery of deep-sea corals that were affected by the 2010 Deepwater Horizon oil spill in the Gulf of Mexico. Over three hundred Paramuricea spp. colonies were imaged yearly between 2011 and 2017 at five sites, and the images were digitized to quantify health, hydroid overgrowth, identify branch loss, and track recovery patterns. Although the median level of impact decreased after 2011 at all impacted sites, it has been stable since then and remained higher than at the reference sites. Recovery depended on the initial... |
| Tipo: Text |
Palavras-chave: Anthropogenic impact; Recovery; Octocoral; Image analysis; Paramuricea biscaya. |
| Ano: 2018 |
URL: https://archimer.ifremer.fr/doc/00454/56558/58268.pdf |
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