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| Boulanger, Emilie; Loiseau, Nicolas; Valentini, Alice; Arnal, Véronique; Boissery, Pierre; Dejean, Tony; Deter, Julie; Guellati, Nacim; Holon, Florian; Juhel, Jean-baptiste; Lenfant, Philippe; Manel, Stéphanie; Mouillot, David. |
| Although we are currently experiencing worldwide biodiversity loss, local species richness does not always decline under anthropogenic pressure. This conservation paradox may also apply in protected areas but has not yet received conclusive evidence in marine ecosystems. Here, we survey fish assemblages in six Mediterranean no-take reserves and their adjacent fishing grounds using environmental DNA (eDNA) while controlling for environmental conditions. We detect less fish species in marine reserves than in nearby fished areas. The paradoxical gradient in species richness is accompanied by a marked change in fish species composition under different managements. This dissimilarity is mainly driven by species that are often overlooked by classical visual... |
| Tipo: Text |
Palavras-chave: Environmental DNA metabarcoding; Marine reserves; Alpha and beta diversity. |
| Ano: 2021 |
URL: https://archimer.ifremer.fr/doc/00692/80374/83491.pdf |
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| Koeck, Barbara; Tessier, Anne; Brind'Amour, Anik; Pastor, Jeremy; Bijaoui, Benjamin; Dalias, Nicolas; Astruch, Patrick; Saragoni, Gilles; Lenfant, Philippe. |
| In the context of growing anthropogenic disturbances that deeply alter marine coastal ecosystems, various management tools are used to protect biodiversity, such as fishing gear limitations, fishing quotas, protected areas or the creation of artificial reefs (ARs). In contrast to the other management tools, ARs require a modification of natural habitats. We used underwater visual censuses to investigate the effect of habitat modification on the structure of fish communities by comparing a natural reef (NR) to ARs with different habitat complexity. Different fish assemblage descriptors were used to assess species- and functional- and community-level aspects of the assemblages. ARs were rapidly colonized by adult fishes and presented community compositions... |
| Tipo: Text |
Palavras-chave: Ecological niche; Fish community; Fisheries management; Functional diversity; Gulf of Lion; Habitat complexity; Mediterranean Sea; Underwater visual census. |
| Ano: 2014 |
URL: https://archimer.ifremer.fr/doc/00189/30029/28514.pdf |
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| Petitgas, Pierre; Grellier, Patrick; Leseur, Floriane; Lenfant, Philippe. |
| Diversity among individuals in a population is an important feature linking vital rates with behaviour and spatial occupation. We measured the growth increments in the otolith of individual fishes collected on the annual fisheries survey PELGAS from 2001 to 2015. Individuals who grew larger at juvenile stage occupied later in life more off-shore habitats. Further, we analysed the allozymes of 13 different loci from 2001 to 2006. Alleles of the enzyme IDH showed different frequencies in inshore and offshore habitats. The population spatially segregates along a coast to off-shore gradient with individuals showing different early growth and allele frequencies. Results show how individuals in a population segregate spatially in different habitats in relation... |
| Tipo: Text |
Palavras-chave: Allozymes; Otoliths; Habitats; Spatial distribution; Anchovy. |
| Ano: 2016 |
URL: http://archimer.ifremer.fr/doc/00353/46379/46001.pdf |
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| Mercader, Manon; Blazy, Christophe; Di Pane, Julien; Devissi, Camille; Mercière, Alexandre; Cheminée, Adrien; Thiriet, Pierre; Pastor, Jérémy; Crec'Hriou, Romain; Verdoit-‐jarraya, Marion; Lenfant, Philippe. |
| Man‐made infrastructures have become ubiquitous components of coastal landscapes, leading to habitat modification that affects the abundance and diversity of marine organisms. Marine coastal fish have a complex life cycle requiring different essential habitats. One of these habitats is known as a nursery, a place where juveniles can settle in large numbers, survive, and grow to contribute to the adult population. Nurseries are mainly found in shallow, sheltered zones and are thus particularly impacted by urbanization, notably by harbors. The vertical featureless structure of docks is very unlikely to be used by juveniles, which need complex habitats to find food and shelter from predators. Recent attempts to rehabilitate the nursery function in such... |
| Tipo: Text |
Palavras-chave: Artificial habitat; Habitat selection; Marine restoration; Nursery; Seascape homogenization; Survival rate. |
| Ano: 2019 |
URL: https://archimer.ifremer.fr/doc/00488/59952/63446.pdf |
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| Kayal, Mohsen; Cigala, Marine; Cambra, Eléonore; Soulat, Nelly; Mercader, Manon; Lebras, Audrey; Ivanoff, Pauline; Sébési, Léa; Lassus-debat, Aurélie; Hartmann, Virginie; Bradtke, Mélissa; Lenfant, Philippe; Jabouin, Coraline; Dubreuil, Julien; Pelletier, Dominique; Joguet, Manon; Le Mellionnec, Solène; Brichet, Marion; Binche, Jean-louis; Payrot, Jérôme; Saragoni, Gilles; Crec’hriou, Romain; Verdoit-jarraya, Marion. |
| Marine reserves constitute effective tools for preserving fish stocks and associated human benefits. However, not all reserves perform equally, and predicting the response of marine communities to management actions in the long run is challenging. Our decadal-scale survey of recreational fishing yields at France’s 45-year old Cerbère-Banyuls marine reserve indicated significant protection benefits, with 40–50% higher fishing yields per unit effort in the partial-protection zone of the reserve (where fishing is permitted but at a lower level) than in surrounding non-reserve areas. Over the period 2005–2014, catch per unit effort (CPUE) declined both inside and outside the reserve, while weight per unit effort (WPUE) increased by 131% inside and decreased by... |
| Tipo: Text |
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| Ano: 2020 |
URL: https://archimer.ifremer.fr/doc/00663/77513/79287.pdf |
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| Garcia, Jessica; Mourier, Johann; Lenfant, Philippe. |
| A better understanding of the key ecological processes of marine organisms is fundamental to improving design and effective implementation of marine protected areas (MPAs) and marine biodiversity. The movement behavior of coral reef fish is a complex mechanism that is highly linked to species life-history traits, predation risk and food resources. We used passive acoustic telemetry to study monthly, daily and hourly movement patterns and space use in two species, Schoolmaster snapper (Lutjanus apodus) and Stoplight parrotfish (Sparisoma viride). We investigated the spatial overlap between the two species and compared intra-specific spatial overlap between day and night. Presence-absence models showed different diel presence and habitat use patterns between... |
| Tipo: Text |
Palavras-chave: Spatial behavior; Acoustic monitoring; Individual variability; Lutjanus apodus; Sparisoma viride; Martinique. |
| Ano: 2015 |
URL: http://archimer.ifremer.fr/doc/00270/38159/36294.pdf |
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