Measure and mis-measure of species diversity in deep-sea chemosynthetic communities

Gauthier, Olivier; Sarrazin, Jozée; Desbruyères, Daniel

doi:10.3354/meps08395

Cited by 19 publications

(31 citation statements)

References 86 publications

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“…Besides this, taxonomic richness was compared between sampling and imagery. Both sample and site-based expected taxonomic richness were assessed by using rarefaction curves (Gotelli and Colwell, 2001;Gauthier et al, 2010).…”

Section: Evaluation Of Sampled Surfacesmentioning

confidence: 99%

Biological data extraction from imagery – How far can we go? A case study from the Mid-Atlantic Ridge

Cuvelier¹,

Busserolles²,

Lavaud³

et al. 2012

Marine Environmental Research

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In the past few decades, hydrothermal vent research has progressed immensely, resulting in higher-quality samples and long-term studies. With time, scientists are becoming more aware of the impacts of sampling on the faunal communities and are looking for less invasive ways to investigate the vent ecosystems. In this perspective, imagery analysis plays a very important role. With this study, we test which factors can be quantitatively and accurately assessed based on imagery, through comparison with faunal sampling. Twelve instrumented chains were deployed on the Atlantic Eiffel Tower hydrothermal edifice and the corresponding study sites were subsequently sampled. Discrete, quantitative samples were compared to the imagery recorded during the experiment. An observer-effect was tested, by comparing imagery data gathered by different scientists. Most factors based on image analyses concerning Bathymodiolus azoricus mussels were shown to be valid representations of the corresponding samples. Additional ecological assets, based exclusively on imagery, were included.

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Section: Evaluation Of Sampled Surfacesmentioning

confidence: 99%

Biological data extraction from imagery – How far can we go? A case study from the Mid-Atlantic Ridge

Cuvelier¹,

Busserolles²,

Lavaud³

et al. 2012

Marine Environmental Research

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“…Rarefaction curves, diversity indices and diversity profiles were computed both with the BiodiversityR package (Kindt & Coe 2005) and functions in Gauthier et al (2010). Multivariate analyses were carried out using the vegan package (Oksanen et al 2012).…”

Section: β-Diversitymentioning

confidence: 99%

Seep communities from two mud volcanoes in the deep eastern Mediterranean Sea: faunal composition, spatial patterns and environmental control

Ritt¹,

Desbruyères²,

Caprais³

et al. 2012

Mar. Ecol. Prog. Ser.

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The Mediterranean Sea constitutes a unique environment to study cold-seep ecosystems due to the presence of different geodynamic settings, from an active margin along the Mediterranean Ridge (MR) to a passive margin in the Nile Deep-Sea Fan (NDSF). We attempted to identify the structure of benthic communities associated with the Napoli and Amsterdam mud volcanoes (MVs) located on the MR and to establish the links between faunal distribution and environmental conditions at different spatial scales. Comparison between the 2 MVs revealed that the faunal distribution seemed to be mainly controlled by the characteristics of the microhabitats. On both geological structures, the variability between the different microhabitats was higher than the variability observed between replicates of the same microhabitat, and the distribution of macrofauna was apparently linked to gradients in physico-chemical conditions. The peripheral sites from Napoli were generally more oxygenated and harboured lower species richness than the active sites. The reduced sediment microhabitat from Amsterdam presented the highest methane concentrations and was mainly colonised by symbiont-bearing vesicomyid bivalves and heterotrophic dorvilleid polychaetes. Overall, a higher taxonomic diversity was observed on Napoli. Substratum type was hypothesised to be the second factor influencing faunal distribution. The results of this study highlight the high heterogeneity of faunal communities associated with seep ecosystems within this region and the need to pursue investigations at various spatial and temporal scales. KEY WORDS: Mediterranean Ridge · Cold seeps · Benthic fauna · Environmental conditions · Diversity indices · MicrohabitatsResale or republication not permitted without written consent of the publisher

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“…Since this pilot study had a similar experimental setting, many factors such as substratum type, colonization surface and duration can be excluded to explain the observed differences. However, temporal and spatial changes in background communities and environmental conditions between the years of deployment and 2011 for the current study) may have triggered differences in copepod densities between the colonization experiments (Gauthier et al 2010).…”

Section: Copepod Densitymentioning

confidence: 99%

Copepod colonization of organic and inorganic substrata at a deep-sea hydrothermal vent site on the Mid-Atlantic Ridge

Plum

Pradillon

Fujiwara

et al. 2017

Deep Sea Research Part II: Topical Studies in Oceanography

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Cite this article as: Christoph Plum, Florence Pradillon, Yoshihiro Fujiwara and Jozée Sarrazin, Copepod colonization of organic and inorganic substrata at a deep-sea hydrothermal vent site on the Mid-Atlantic Ridge, Deep-Sea Research Part II, http://dx. AbstractThe few existing studies on deep-sea hydrothermal vent copepods indicate low connectivity with surrounding environments and reveal high endemism among vents. However, the finding of non-endemic copepod species in association with engineer species at different reduced ecosystems poses questions about the dispersal of copepods and the colonization of hydrothermal vents as well as their ecological connectivity.The objective of this study is to understand copepod colonization patterns at a hydrothermal vent site in response to environmental factors such as temperature and fluid flow as well as the presence of different types of substrata. To address this objective, an in situ experiment was deployed using both organic (woods, pig bones) and inorganic (slates) substrata along a gradient of hydrothermal activity at the Lucky Strike vent field (Eiffel Tower, Mid-Atlantic Ridge). The substrata were deployed in 2011 during the MoMARSAT cruise and were recovered after two years in 2013.Overall, copepod density showed significant differences between substrata types, but was similar among different hydrothermal activity regimes. Highest densities were observed on woods at sites with moderate or low fluid input, whereas bones were the most densely 2 colonized substrata at the 2 sites with higher hydrothermal influence. Although differences in copepod diversity were not significant, the observed trends revealed overall increasing diversity with decreasing temperature and fluid input. Slates showed highest diversity compared to the organic substrata. Temperature and fluid input had a significant influence on copepod community composition, resulting in higher similarity among stations with relatively high and low fluid inputs, respectively. While vent-specialists such as dirivultids and the tegastid Smacigastes micheli dominated substrata at high vent activity, the experiment demonstrated increasing abundance and dominance of non-vent taxa with decreasing temperature and fluid input. Effects of the substratum type on community composition were not significant, although at sites with moderate or low fluid input, woods exhibited distinctive communities with high densities and relative abundance of the taxon Nitocrella sp.. In conclusion, copepod colonization and species composition were mainly influenced by hydrothermal fluid input and temperature rather than the type of substratum. The outcome of this study provides fundamental knowledge to better understand copepod colonization at hydrothermal vents.

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Measure and mis-measure of species diversity in deep-sea chemosynthetic communities

Cited by 19 publications

References 86 publications

Biological data extraction from imagery – How far can we go? A case study from the Mid-Atlantic Ridge

Biological data extraction from imagery – How far can we go? A case study from the Mid-Atlantic Ridge

Seep communities from two mud volcanoes in the deep eastern Mediterranean Sea: faunal composition, spatial patterns and environmental control

Copepod colonization of organic and inorganic substrata at a deep-sea hydrothermal vent site on the Mid-Atlantic Ridge

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