Ching Villanueva
@en.ifremer.fr
Senior Researcher Department of Marine Biologic and environental resources
IFREMER
RESEARCH, TEACHING, or OTHER INTERESTS
Ecological Modeling, Multidisciplinary, Aquatic Science, Renewable Energy, Sustainability and the Environment
Scopus Publications
Scholar Citations
Scholar h-index
Scholar i10-index
Scopus Publications
Alexander Kempf, Michael A. Spence, Sigrid Lehuta, Vanessa Trijoulet, Valerio Bartolino, Maria Ching Villanueva, and Sarah K. Gaichas
Elsevier BV
Deirdre Brophy, Sílvia Pérez-Mayol, Roxanne Duncan, Karin Hüssy, Audrey J. Geffen, Hans D. Gerritsen, Maria Ching Villanueva, and Beatriz Morales-Nin
Elsevier BV
Paul Tixier, Paul Burch, Gaetan Richard, Karin Olsson, Dirk Welsford, Mary-Anne Lea, Mark A. Hindell, Christophe Guinet, Anais Janc, Nicolas Gasco,et al.
Springer Science and Business Media LLC
AbstractThe emergence of longline fishing around the world has been concomitant with an increase in depredation-interactions by odontocete whales (removal of fish caught on hooks), resulting in substantial socio-economic and ecological impacts. The extent, trends and underlying mechanisms driving these interactions remain poorly known. Using long-term (2003–2017) datasets from seven major Patagonian toothfish (Dissostichus eleginoides) longline fisheries, this study assessed the levels and inter-annual trends of sperm whale (Physeter macrocephalus) and/or killer whale (Orcinus orca) interactions as proportions of fishing time (days) and fishing area (spatial cells). The role of fishing patterns in explaining between-fisheries variations of probabilities of odontocete interactions was investigated. While interaction levels remained globally stable since the early 2000s, they varied greatly between fisheries from 0 to >50% of the fishing days and area. Interaction probabilities were influenced by the seasonal concentration of fishing effort, size of fishing areas, density of vessels, their mobility and the depth at which they operated. The results suggest that between-fisheries variations of interaction probabilities are largely explained by the extent to which vessels provide whales with opportunities for interactions. Determining the natural distribution of whales will, therefore, allow fishers to implement better strategies of spatio-temporal avoidance of depredation.
Sung-Tse Lee, Chitsan Lin, Chi Thanh Vu, Yi-Cyuan Chen, Kang-Shin Chen, and Maria Ching Villanueva
Elsevier BV
V Vallée, MC Villanueva, and F Blanchard
Inter-Research Science Center
Anaïs Janc, Gaëtan Richard, Christophe Guinet, John P.Y. Arnould, Maria Ching Villanueva, Guy Duhamel, Nicolas Gasco, and Paul Tixier
Elsevier BV
Arnaud Auber, Morgane Travers‐Trolet, Maria Ching Villanueva, and Bruno Ernande
Wiley
AbstractThere is a growing need to easily describe and synthesize the dynamics of ecosystems’ components in space and time. Most multivariate analyses provide ordination diagrams or biplots that are too cluttered to allow simple reading and are unfamiliar to most users. To overcome such difficulties, a novel application of principal response curves (PRCs) is proposed. Principal response curves are traditionally used to assess treatment effects on community structure measured repeatedly over time. In this new application, the tested factor and the repeated‐observation axis are replaced by time and space, respectively. The georeferencing of sampling sites permits to produce an easy‐to‐read map that summarizes both the temporal dynamics of the community and the contribution of each species to these dynamics at each sampling site. A 24‐yr‐long time series of scientific surveys monitoring 77 fish and cephalopod species in the Eastern English Channel is used to illustrate the novel application of the PRC method. This new application could prove a relevant tool for the ecosystem approach to human activities management by providing spatialized indicators of community changes, as spatial monitoring tools are increasingly recommended for measuring the effectiveness of management actions.
Chitsan Lin, Kim Anh Nguyen, Chi Thanh Vu, Delia Senoro, and Maria Ching Villanueva
IWA Publishing
Abstract The Houjing River has long been an environmental victim of economic development. Industries that have settled along the bank of this river may have largely contributed to severe organic wastes pollution. This study collected water and sediment samples at various points along the river and measured concentrations of 61 volatile organic compounds (VOCs) and 128 semi-volatile organic compounds (SVOCs) for a period of 16 months (Feb 2014–June 2015). Our analyses show that elevated levels of VOCs were observed near two industrial areas, Dashe and Renwu industrial parks. High SVOC concentrations were found in the vicinities of the Nanzih Export Processing Zone (NEPZ) and CingPu station, possibly due to considerable effluent discharges of adjacent industrial and residential areas. Comparing this study's findings with the standard values of different governmental agencies and studies similar to this one, the ecosystem of the Houjing River was seriously contaminated. This study could be used by the government as a basis for future and urgent pollution prevention actions aimed at protecting this ecosystem and reducing the negative impacts of these contaminants on the health and well-being of the local residents and the environment.
Chi Thanh Vu, Chitsan Lin, Gavin Yeh, and Maria Ching Villanueva
Springer Science and Business Media LLC
M. Cachera, B. Ernande, M.C. Villanueva, and S. Lefebvre
Elsevier BV
T Mille, K Mahé, M Cachera, MC Villanueva, H de Pontual, and B Ernande
Inter-Research Science Center
Previous studies have shown that the amount of food influences fish otolith structure, opacity and shape and that diet composition has an effect on otolith chemical composition. This study investigated the potential correlation between diet and otolith shape in 5 wild marine fish species by addressing 4 complementary questions. First, is there a global relationship between diet and otolith shape? Second, which prey categories are involved in this relationship? Third, what are the respective contributions of food quantity and relative composition to diet-otolith shape co-variation? Fourth, is diet energetic composition related to otolith shape? For each species, we investigated how otolith shape varies with diet. These questions were tackled by describing diet in the analysis in 4 different ways, while also including individual-state variables to remove potential confounding effects. First, besides the strong effect of individual-state, a global relationship between diet and otolith shape was detected for 4 out of 5 fish species. Second, both main and secondary prey categories were related to variability in otolith shape, and otolith outline reconstructions revealed that both otolith global shape and its finer details co-varied with these prey categories. Third, the contribution of relative diet composition to diet-otolith shape co-variation was much higher than that of ingested food quantity. Fourth, the energetic composition of diet was related to otolith shape of only 1 species. These results suggest that diet in marine fish species may influence the quantity and composition of saccular endolymph proteins which play an important role in otolith biomineralization and their resulting 3D structure.
M. Ching Villanueva and Alonso Aguilar Ibarra
Elsevier BV
Samuele Tecchio, Armonie Tous Rius, Jean-Claude Dauvin, Jérémy Lobry, Géraldine Lassalle, Jocelyne Morin, Nicolas Bacq, Marie Cachera, Aurélie Chaalali, Maria Ching Villanueva,et al.
Elsevier BV
T. Mille, K. Mahe, M. C. Villanueva, H. De Pontual, and B. Ernande
Wiley
This study investigated and compared asymmetry in sagittal otolith shape and length between left and right inner ears in four roundfish and four flatfish species of commercial interest. For each species, the effects of ontogenetic changes (individual age and total body length), sexual dimorphism (individual sex) and the otolith's location on the right or left side of the head, on the shape and length of paired otoliths (between 143 and 702 pairs according to species) were evaluated. Ontogenetic changes in otolith shape and length were observed for all species. Sexual dimorphism, either in otolith shape and length or in their ontogenetic changes, was detected for half of the species, be they round or flat. Significant directional asymmetry in otolith shape and length was detected in one roundfish species each, but its inconsistency across species and its small average amplitude (6·17% for shape and 1·99% for length) suggested that it has barely any biological relevance. Significant directional asymmetry in otolith shape and length was found for all flatfish species except otolith length for one species. Its average amplitude varied between 2·06 and 17·50% for shape and between 0·00 and 11·83% for length and increased significantly throughout ontogeny for two species, one dextral and one sinistral. The longer (length) and rounder otolith (shape) appeared to be always on the blind side whatever the species. These results suggest differential biomineralization between the blind and ocular inner ears in flatfish species that could result from perturbations of the proximal‐distal gradient of otolith precursors in the endolymph and the otolith position relative to the geometry of the saccular epithelium due to body morphology asymmetry and lateralized behaviour. The fact that asymmetry never exceeded 18% even at the individual level suggests an evolutionary canalization of otolith shape symmetry to avoid negative effects on fish hearing and balance. Technically, asymmetry should be accounted for in future studies based on otolith shape.
Arnaud Auber, Morgane Travers-Trolet, Maria Ching Villanueva, and Bruno Ernande
Public Library of Science (PLoS)
Identifying the various drivers of marine ecosystem regime shifts and disentangling their respective influence are critical tasks for understanding biodiversity dynamics and properly managing exploited living resources such as marine fish communities. Unfortunately, the mechanisms and forcing factors underlying regime shifts in marine fish communities are still largely unknown although climate forcing and anthropogenic pressures such as fishing have been suggested as key determinants. Based on a 24-year-long time-series of scientific surveys monitoring 55 fish and cephalopods species, we report here a rapid and persistent structural change in the exploited fish community of the eastern English Channel from strong to moderate dominance of small-bodied forage fish species with low temperature preferendum that occurred in the mid-1990s. This shift was related to a concomitant warming of the North Atlantic Ocean as attested by a switch of the Atlantic Multidecadal Oscillation from a cold to a warm phase. Interestingly, observed changes in the fish community structure were opposite to those classically induced by exploitation as larger fish species of higher trophic level increased in abundance. Despite not playing a direct role in the regime shift, fishing still appeared as a forcing factor affecting community structure. Moreover, although related to climate, the regime shift may have been facilitated by strong historic exploitation that certainly primed the system by favoring the large dominance of small-bodied fish species that are particularly sensitive to climatic variations. These results emphasize that particular attention should be paid to multidecadal natural climate variability and its interactions with both fishing and climate warming when aiming at sustainable exploitation and ecosystem conservation.
Kristian Metcalfe, Sandrine Vaz, Georg H. Engelhard, Maria Ching Villanueva, Robert J. Smith, and Steven Mackinson
Wiley
Summary Well‐designed marine protected area (MPA) networks can deliver a range of ecological, economic and social benefits, and so a great deal of research has focused on developing spatial conservation prioritization tools to help identify important areas. However, whilst these software tools are designed to identify MPA networks that both represent biodiversity and minimize impacts on stakeholders, they do not consider complex ecological processes. Thus, it is difficult to determine the impacts that proposed MPAs could have on marine ecosystem health, fisheries and fisheries sustainability. Using the eastern English Channel as a case study, this paper explores an approach to address these issues by identifying a series of MPA networks using the Marxan and Marxan with Zones conservation planning software and linking them with a spatially explicit ecosystem model developed in Ecopath with Ecosim. We then use these to investigate potential trade‐offs associated with adopting different MPA management strategies. Limited‐take MPAs, which restrict the use of some fishing gears, could have positive benefits for conservation and fisheries in the eastern English Channel, even though they generally receive far less attention in research on MPA network design. Our findings, however, also clearly indicate that no‐take MPAs should form an integral component of proposed MPA networks in the eastern English Channel, as they not only result in substantial increases in ecosystem biomass, fisheries catches and the biomass of commercially valuable target species, but are fundamental to maintaining the sustainability of the fisheries. Synthesis and applications. Using the existing software tools Marxan with Zones and Ecopath with Ecosim in combination provides a powerful policy‐screening approach. This could help inform marine spatial planning by identifying potential conflicts and by designing new regulations that better balance conservation objectives and stakeholder interests. In addition, it highlights that appropriate combinations of no‐take and limited‐take marine protected areas might be the most effective when making trade‐offs between long‐term ecological benefits and short‐term political acceptability.
Maria Ching Villanueva
Elsevier BV
Dorothée Kopp, Sébastien Lefebvre, Marie Cachera, Maria Ching Villanueva, and Bruno Ernande
Elsevier BV
K. Mahe, M. C. Villanueva, S. Vaz, F. Coppin, P. Koubbi, and A. Carpentier
Wiley
Truss analysis and length measurements were made on 168 striped red mullet Mullus surmuletus. Multivariate statistical analyses with principal component analysis and partial redundancy analysis (pRDA) were used on these measurements to evaluate the influence of maturity, sex and geographical area distribution on body shape. Truss measurements were important to quantify and discriminate changing body shape, presumably due to changing environmental conditions. Sexual dimorphism was not observed and juveniles could be distinguished from adults based on their body shape. More importantly, M. surmuletus occurring in different geographical areas could be differentiated using this method. Based on pRDA, a significant difference of head morphological dimensions was observed between populations occurring in the eastern English Channel and those occurring in the Bay of Biscay, suggesting that fish from these areas could represent two subpopulations.
P Gnohossou, P Lalèyè, P Atachi, G Magali, MC Villanueva, and J Moreau
National Inquiry Services Center (NISC)
Stomach contents of the 12 most abundant fish species in Lake Nokoué, Benin, collected between 2003 and 2005, were analysed for temporal variations in their diet. Several species showed seasonal shifts in their diets based on benthic prey abundance and biomass variation, which are influenced by physico-chemical environmental changes. Five trophic guilds were identified: detritivorous, microbenthivorous, macrobenthivorous, zooplanktivorous and piscivorous. Trophic guilds in 2003–2005, compared to 1961, showed a decrease of benthivorous species, which illustrates the vulnerability of this group whose prey are particularly exposed to organic pollution.
I. Rombouts, G. Beaugrand, L.F. Artigas, J.-C. Dauvin, F. Gevaert, E. Goberville, D. Kopp, S. Lefebvre, C. Luczak, N. Spilmont,et al.
Elsevier BV
Maria Concepcion S. Villanueva, Mwapu Isumbisho, Boniface Kaningini, Jacques Moreau, and Jean-Claude Micha
Elsevier BV
S.S.K. Haputhantri, M.C.S. Villanueva, and J. Moreau
Elsevier BV