| Enregistrements |
| Auteur |
Alves-Júnior, F.D.A.; Silva, E.D.S.; Araújo, M.D.S.L.C.D.; Cardoso, I.; Bertrand, A.; Souza-Filho, J.F. |
| Titre |
Taxonomy of deep-sea shrimps of the Superfamily Oplophoroidea Dana 1852 (Decapoda: Caridea) from Southwestern Atlantic |
Type |
Article scientifique |
| Année |
2019 |
Publication |
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Revue Abrégée |
Zootaxa |
Volume  |
4613 |
Numéro |
3 |
Pages |
401-442 |
| Mots-Clés |
Crustacea; Acanthephyridae; New Records; bathypelagic shrimps; deep waters; deep-sea biodiversity; Northeastern Brazil; Oplophoridae |
| Résumé |
In this paper, we provide some available information about the occurrence and some taxonomic aspects of 19 species from the Superfamily Oplophoroidea in the southwestern Atlantic (Brazilian waters), with the update to 22 species of Oplophoroidea occurring in Brazilian waters. Samples were collected during two sets of surveys. The first was performed in 2009 and 2011 in the Potiguar Basin in northeast of Brazil (03–05°S; 38–35°W; between the States of Ceará and Rio Grande do Norte) under the framework of the project “Avaliação da biota bentônica e planctônica da Bacia Potiguar e Ceará (Bpot)”, with samples collected from bottom trawls in the continental slope at depth ranging from 150–2068 m. Second, under the in the framework of the ABRACOS (Acoustic along the Brazilian coast), performed in 2015 and 2017 on seamounts and offshore areas in Northeast Brazil (Ceará Chain, Rio Grande do Norte and Rocas Atoll, Fernando de Noronha Archipelago and Pernambuco State), with samples with pelagic micronekton and mesopelagic nets, in depths ranging from 50–1260 m. We highlight the occurrence of 14 species of the family Acanthephyridae and 5 species of the family Oplophoridae, including the first occurrences of five species to Brazilian deep waters: Acanthephyra kingsleyi Spence Bate, 1888, Ephyrina ombango Crosnier & Forest, 1973, Meningodora compsa (Chace, 1940), M. longisulca Kikuchi, 1985 and Systellapsis curvispina Crosnier, 1987. These records increase the knowledge on deep-sea shrimps occurring in Southwestern Atlantic. |
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en |
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1175-5334 |
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pas de |
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MARBEC @ isabelle.vidal-ayouba @ |
collection |
2584 |
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Leruste, A.; Villeger, S.; Malet, N.; De Wit, R.; Bec, B. |
| Titre |
Complementarity of the multidimensional functional and the taxonomic approaches to study phytoplankton communities in three Mediterranean coastal lagoons of different trophic status |
Type |
Article scientifique |
| Année |
2018 |
Publication |
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Revue Abrégée |
Hydrobiologia |
| Volume |
815 |
Numéro |
1 |
Pages |
207-227 |
| Mots-Clés |
classification; Classification; disturbance; diversity; ecology; Functional entity; Functional traits; lake phytoplankton; marine-phytoplankton; patterns; size; synechococcus; Taxonomic diversity; traits |
| Résumé |
We used the individual-based multidimensional functional diversity and the taxonomic approaches in a complementary way to describe phytoplankton communities in three coastal lagoons with different eutrophication status in the South of France. We sampled communities during three seasons, i.e., in autumn, spring, and summer. Using classical taxonomy, 107 taxa/morphotypes were identified in the nine communities. The individual-based functional approach allowed grouping these individuals into 20 functional entities according to their values for 5 traits related to trophic adaptations (cell size, mobility, trophic regime, coloniality, and pelagic/benthic life). Some species (e.g., Prorocentrum micans) emerged in multiple functional entities, showing the importance to consider intraspecific variability. The functional description of phytoplankton communities better reflected the hydrological functioning and the different eutrophication status of the lagoons than the taxonomic approach. Specific functional adaptations were identified in the nine communities. For example, phytoplankton organisms with heterotrophic and potentially mixotrophic abilities occurred when the availability of inorganic nutrient decreased, or when organic matter and small preys were potentially the main nutrient resources. The limitation has also favored small cells highly competitive for nutrients. Using functional indices together with taxonomic description has also helped revealing important aspects of community assembly, such as competitive exclusion in summer. |
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0018-8158 |
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MARBEC @ alain.herve @ |
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2322 |
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Li, S.; Deng, Y.; Du, X.; Feng, K.; Wu, Y.; He, Q.; Wang, Z.; Liu, Y.; Wang, D.; Peng, X.; Zhang, Z.; Escalas, A.; Qu, Y. |
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Sampling cores and sequencing depths affected the measurement of microbial diversity in soil quadrats |
Type |
Article scientifique |
| Année |
2021 |
Publication |
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Revue Abrégée |
Sci. Total Environ. |
| Volume |
767 |
Numéro |
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Pages |
144966 |
| Mots-Clés |
alpha diversity; Biological replicate; Common species; Hill number; Pooling; Sampling strategy |
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Due to the massive quantity and broad phylogeny, an accurate measurement of microbial diversity is highly challenging in soil ecosystems. Initially, the deviation caused by sampling should be adequately considered. Here, we attempted to uncover the effect of different sampling strategies on a diversity measurement of soil prokaryotes. Four 1 m(2) sampling quadrats in a typical grassland were thoroughly surveyed through deep 16S rRNA gene sequencing (over 11 million reads per quadrat) with numerous replicates (33 soil sampling cores with total 141 replicates per quadrat). We found the difference in diversity was relatively small when pooling soil cores before and after DNA extraction and sequencing, but they were both superior to a non-pooling strategy. Pooling a small number of soil cores (i.e., 5 or 9) combined with several technical replicates is sufficient to estimate diversities for soil prokaryotes, and there is great flexibility in pooling original samples or data at different experimental steps. Additionally, the distribution of local alpha diversity varies with sampling core number, sequencing depth, and abundance distribution of the community, especially for high orders of Hill diversity index (Le., Shannon entropy and inverse Simpson index). For each grassland soil quadrat (1 m(2)), retaining 100,000 reads after taxonomic dustering might be a realistic option, as these number of reads can efficiently cover the majority of common species in this area. Our findings provide important guidance for soil sampling strategy, and the general results can serve as a basis for further studies. (C) 2021 Elsevier B.V. All rights reserved. |
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0048-9697 |
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WOS:000617681100079 |
Approuvé |
pas de |
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MARBEC @ isabelle.vidal-ayouba @ |
collection |
3001 |
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Oikonomou, A.; Leprieur, F.; Leonardos, I.D. |
| Titre |
Biogeography of freshwater fishes of the Balkan Peninsula |
Type |
Article scientifique |
| Année |
2014 |
Publication |
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Revue Abrégée |
Hydrobiologia |
| Volume |
738 |
Numéro |
1 |
Pages |
205-220 |
| Mots-Clés |
Balkan Peninsula; Beta diversity; Bioregionalisation; Conservation biogeography; Vulnerability; ancient lakes; biodiversity conservation; endemism; freshwater fish; global patterns; mitochondrial-dna sequences; north-america; phylogeography; species richness |
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Delineating biogeographical regions is a critical step towards the establishment and evaluation of conservation priorities. In the present study, we analysed the distribution patterns of the freshwater fish of an understudied European biodiversity hotspot, the Balkan Peninsula. Based on the most extensive available database of native freshwater fish species distributions, we performed a hierarchical clustering analysis to identify the major biogeographical regions of the Balkan Peninsula. We also highlighted the 'hottest hotspots' of freshwater fish diversity across the delimited biogeographical regions by describing the patterns of species richness, endemic and vulnerable species; indicator species were also determined. The bioregionalisation scheme consisted of eight groups of drainage basins that correspond to distinct regions of the Balkan Peninsula. Overall, the delineated biogeographical regions varied in terms of species richness, endemism, vulnerability (i.e. extinction threats) and indicator species composition. From a conservation perspective, this study emphasises the prioritisation of areas characterised by high levels of irreplaceability (endemism) and vulnerability (i.e. the Attikobeotia region, Ionian Sea and Prespa Lakes) and stresses the necessity of implementing a network of protected freshwater areas across the Balkan Peninsula. |
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0018-8158 |
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pas de |
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MARBEC @ isabelle.vidal-ayouba @ |
collection |
454 |
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Mouton, T.L.; Matheson, F.E.; Stephenson, F.; Champion, P.D.; Wadhwa, S.; Hamer, M.P.; Catlin, A.; Riis, T. |
| Titre |
Environmental filtering of native and non-native stream macrophyte assemblages by habitat disturbances in an agricultural landscape |
Type |
Article scientifique |
| Année |
2019 |
Publication |
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Revue Abrégée |
Sci. Total Environ. |
| Volume |
659 |
Numéro |
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Pages |
1370-1381 |
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Agricultural impacts; classification; ecological impacts; eutrophication; Functional diversity; functional diversity measures; Functional traits; land-use; management; metaanalysis; Non-native flora; restoration; RLQ and fourth-corner analyses; species traits; trait responses |
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Understanding how inter-specific variation in functional traits affects native and non-native species responses to stream disturbances, is necessary to inform management strategies, providing tools for biomonitoring, conservation and restoration. This study used a functional trait approach to characterise the responses of macrophyte assemblages to reach-scale disturbances (measured by lack of riparian shading, altered hydromorphology and eutrophication), from 97 wadeable stream sites in an agriculturally impacted region of New Zealand. To determine whether macrophyte assemblages differed due to disturbances, we examined multidimensional assemblage functional structure in relation to eleven functional traits and further related two functional diversity indices (entropy and originality) to disturbances. Macrophyte assemblages showed distinct patterns in response to disturbances, with riparian shading and hydromorphological conditions being the strongest variables shaping macrophyte functional structure. In the multidimensional space, most of the non-native species were associatedwith disturbed conditions. These species had traits allowing faster colonisation rates (higher number of reproductive organs and larger root-rhizome system) and superior competitive abilities for resources (tall and dense canopy, heterophylly and greater preferences for light and nitrogen). In addition, lack of riparian shading increased the abundance of functionally distinct species (i.e. entropy), and eutrophication resulted in the growth of functionally unique species (i.e. originality). We demonstrated that stream reach-scale habitat disturbances were associated to a dominance of more productive species, equating to a greater abundance of non-native species. This, can result in a displacement of native species, habitat alterations, and changes to higher trophic level assemblages. Our results suggests that reachscale management efforts such as the conservation and restoration of riparian vegetation that provides substantial shading and hydromorphologically diverse in-stream habitat, would have beneficial direct and indirect effects on ecosystem functioning, and contribute to the mitigation of land-use impacts. (C) 2018 Published by Elsevier B.V. |
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English |
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0048-9697 |
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Approuvé |
pas de |
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MARBEC @ isabelle.vidal-ayouba @ |
collection |
2571 |
| Lien permanent pour cet enregistrement |
