Article (Scientific journals)
Spatial and interannual variability of presettlement tropical fish assemblages explained by remote sensing oceanic conditions
Jaonalison, Henitsoa; Durand, Jean-Dominique; Mahafina, Jamal et al.
2020In Marine Biodiversity, 50 (4), p. 52
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Keywords :
DNA barcoding; Environmental conditions; Fish post-larvae; Gradient forest; Hierarchical classification
Abstract :
[en] Understanding the interannual effect of various environmental factors on biodiversity distribution is fundamental for developing biological monitoring tools. The interannual variability of environmental factors on presettlement fish assemblages (PFAs) has been so far under investigated, especially in Madagascar. Numerous explanatory variables including local hydro-dynamic conditions recorded during the sampling night, characteristics of the benthic substrate and remotely sensed oceanic conditions (RSOC) were used to explain the spatio-temporal variability of PFAs in southwestern Madagascar. Gradient forest analyses were used to hierarchically classify the effect of these explanatory variables on the PFAs for two sites and during two different recruitment seasons. RSOC variables appeared to better explain the PFAs than the local variable and the characteristics of the benthic substrate. The PFAs caught in water masses with coastal characteristics were better explained than those with open water characteristics. This spatial variability is hypothesised to be linked to differences in feeding conditions among water masses. The gradient forest analyses also highlighted the complexity of predicting PFAs as the species for which abundances were better explained by RSOC variables varied between years. This interannual variability was mainly explained by the interannual variation of chlorophyll a (Chl a) concentration, wind and surface current, with better prediction obtained during the year with high Chl a values associated with high averaged sea surface temperature. These findings suggest the importance of forecasting Chl a concentrations, taking into account the impact of tropical storms and climate variability in order to predict PFAs in the future.
Disciplines :
Aquatic sciences & oceanology
Author, co-author :
Jaonalison, Henitsoa  ;  Université de Liège - ULiège > Freshwater and OCeanic science Unit of reSearch (FOCUS) ; Institut Halieutique et des Sciences Marines, Université de Toliara, Toliara, Madagascar
Durand, Jean-Dominique;  MARBEC, IRD, Univ. Montpellier, Montpellier, France
Mahafina, Jamal;  Institut Halieutique et des Sciences Marines, Université de Toliara, Toliara, Madagascar
Demarcq, Hervé;  MARBEC, (IRD, Univ Montpellier, CNRS, Ifremer), Centre de Sète, France
Lagarde, Raphaël;  Université de Perpignan Via Domitia-CNRS, Centre de Formation et de Recherche sur les Environnements Méditerranéens, Perpignan, France
Ponton, Dominique;  ENTROPIE, IRD-Université de La Réunion-CNRS, Laboratoire d’Excellence CORAIL, c/o Institut Halieutique et des Sciences Marines, Université de Toliara, Toliara, Madagascar
Language :
English
Title :
Spatial and interannual variability of presettlement tropical fish assemblages explained by remote sensing oceanic conditions
Publication date :
August 2020
Journal title :
Marine Biodiversity
ISSN :
1867-1616
eISSN :
1867-1624
Publisher :
Springer
Volume :
50
Issue :
4
Pages :
52
Peer reviewed :
Peer Reviewed verified by ORBi
Funders :
IRD - French National Research Institute for Sustainable Development [FR]
CEPF - Critical Ecosystem Partnership Fund [US-VA]
Funding text :
Our acknowledgements going to the research assistants (J. J. Marcellin, D. Fiandria, R. Tsipy, Tovondrainy, and Noelson) for conducting fish sampling, and to the team of the ‘Institut des Sciences de l’Evolution de Montpellier’ (ISEM) for sequencing our fish tissues, and the Institut Halieutique et des Sciences Marines for issuing research permit. We also thank the three reviewers for their constructive remarks leading to the improvement our manuscript quality.
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