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| Marques, Raquel; Darnaude, Audrey M.; Schiariti, Agustin; Tremblay, Yann; Molinero, Juan-carlos; Soriano, Solenn; Hatey, Elise; Colantoni, Sébastien; Bonnet, Delphine. |
| For many jellyfish, the magnitude and timing of medusae blooms are recognized to result from the benthic stage dynamics. However, information on the scyphistomae of jellyfish populations in the wild remains scarce. Here, bi-mensual underwater photoquadrat surveys were combined with scyphistomae sampling and observation to describe the annual (February 2017–January 2018) benthic stage dynamics and asexual reproduction strategy of Aurelia coerulea in the Thau lagoon (43°25′31.1″N; 03°42′0.9″E). Our results revealed unexpected seasonal patterns of variation: scyphistoma coverage peaked in the spring (11.6 ± 3.7% on 21st April) and was minimal in the summer and autumn (1.4 ± 1.3% on 10th October). The increase in scyphistoma coverage mainly resulted from an... |
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| Ano: 2019 |
URL: https://archimer.ifremer.fr/doc/00497/60902/66960.pdf |
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| Delerue-ricard, Sophie; Darnaude, Audrey M.; Raeymaekers, Joost A.m.; Dundas, Siv Hjorth; Skadal, Julie; Volckaert, Filip A.m.; Geffen, Audrey J.. |
| Connectivity between spawning and nursery grounds influences the colonization, replenishment and resilience of populations of marine organisms. Connectivity rate, measured as the exchange of individuals between spawning and nursery grounds, is therefore a crucial determinant of stock size. However, connectivity of early-life stages is hard to explore due to sampling limitations and insufficient knowledge on potential larval sources. Here we present new insights into pre- and post-settlement dispersal of the common sole (Solea solea L.) at a spatial scale of 5–500 km in the Southern North Sea. Patterns at a scale of <100 km were considered local, whereas patterns further than 100 km were considered regional. Multi-elemental signatures of the otolith edge... |
| Tipo: Text |
Palavras-chave: Connectivity; Early-life history; North Sea; Otolith elemental composition; Trace elements; Solea solea. |
| Ano: 2019 |
URL: https://archimer.ifremer.fr/doc/00594/70601/68794.pdf |
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| Brehmer, Patrice; Thang Do Chi,; Laugier, Thierry; Galgani, Francois; Laloe, Francis; Darnaude, Audrey M.; Fiandrino, Annie; Mouillot, David. |
| 1. Abiotic and biotic variables of coastal lagoons are highly heterogeneous in both space and time, and this heterogeneity complicates the assessment of their ecological status. These variables are essential to the monitoring and preservation of these fragile ecotones and the resources and services they sustain. 2. An integrative approach for evaluating the ecological status of coastal lagoons, based on field investigations of the key parameters driving their functioning and a set of selected ecological indicators matching lagoon management information needs for societal benefits, is investigated. Consistency in lagoon status evaluation from multiple and different variables was estimated, through a case study comparing three adjacent yet contrasting French... |
| Tipo: Text |
Palavras-chave: Coastal lagoon; Ecological assessment; Ecotoxicology; Eutrophication; Indicator; Management; Mediterranean Sea; Observatory. |
| Ano: 2011 |
URL: http://archimer.ifremer.fr/doc/00056/16702/14202.pdf |
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| Marques, Raquel; Bouvier, Corinne; Darnaude, Audrey M.; Molinero, Juan-carlos; Przybyla, Cyrille; Soriano, Solenn; Tomasini, Jean-antoine; Bonnet, Delphine. |
| Although scientific interest on jellyfish ecology has substantially increased in the last decades, little is known on the role of potential predators shaping their population dynamics. Jellyfish were long considered as ‘dead ends’ within food webs, and therefore overlooked as potential food source for higher trophic levels, e.g. fishes. Here this question is tackled by using comprehensive laboratory experiments assessing fish predation on jellyfish. The approach included all the life stages (polyps, ephyrae and medusa) of Aurelia sp. versus more traditional aquaculture feeds in an easily farmed opportunistic fish, the gilthead seabream Sparus aurata (L.). Results revealed that all life stages of Aurelia sp. were accepted as a source of food by S. aurata,... |
| Tipo: Text |
Palavras-chave: Aurelia sp.; Predation; Fish; Sparus aurata; Ingestion rate; Energy pathways. |
| Ano: 2016 |
URL: http://archimer.ifremer.fr/doc/00349/46018/46026.pdf |
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| Lett, Christophe; Barrier, Nicolas; Ourmières, Yann; Petit, Cécile; Labonne, Maylis; Bourjea, Jerome; Darnaude, Audrey M.. |
| To investigate dispersal and connectivity between spawning and lagoon nursery habitats of the gilthead seabream, Sparus aurata, in the Gulf of Lions (northwestern Mediterranean Sea), we modeled the potential transport of the species’ larvae between its supposed main spawning site in the region (the Planier Island) and two of its main local nursery areas (the coastal lagoons of Thau and Salses-Leucate). Passive larval drift simulations using a dispersal biophysical model showed a large variability in the possible trajectories from spawning to nursery areas and in the predicted ages for larvae arrival on the two nursery sites. The most common ages at arrival obtained in the simulations (20–60 days) are broadly consistent with previous modeling studies but... |
| Tipo: Text |
Palavras-chave: Sparus aurata; Gulf of Lions; Fish; Larvae; Models-hydrodynamic; Biophysical model; Connectivity; Otolith. |
| Ano: 2019 |
URL: https://archimer.ifremer.fr/doc/00513/62470/66903.pdf |
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| Marques, Raquel; Darnaude, Audrey M.; Crochemore, Sandrine; Bouvier, Corinne; Bonnet, Delphine. |
| Until recently, jellyfish have been ignored as an important source of food, due to their low nutritional value. Here, quantitative PCR was used to detect and quantify the DNA of the jellyfish Aurelia coerulea in the gut contents of commercially important fish species from the Thau Lagoon. Individuals from five fish species were collected during two different periods: the bloom period, when the pelagic stages of A. coerulea are abundant, and the post-bloom period, when only the benthic stage – polyps – is present in the lagoon. The DNA of A. coerulea was detected in the guts of 41.9% of the fish analysed, belonging to four different species. The eel Anguilla anguilla and the seabream Sparus aurata were important jellyfish consumers during the bloom and... |
| Tipo: Text |
Palavras-chave: Predation; Aurelia coerulea; Eel; Seabream; Polyps; Medusae; Quantitative PCR; Gut content; Thau lagoon. |
| Ano: 2019 |
URL: https://archimer.ifremer.fr/doc/00513/62469/66986.pdf |
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| Artetxe-arrate, Iraide; Fraile, Igaratza; Farley, Jessica; Darnaude, Audrey M.; Clear, Naomi; Rodríguez-ezpeleta, Naiara; Dettman, David L.; Pécheyran, Christophe; Krug, Iñigo; Médieu, Anais; Ahusan, Mohamed; Proctor, Craig; Priatna, Asep; Lestari, Pratiwi; Davies, Campbell; Marsac, Francis; Murua, Hilario. |
| The chemical composition of otoliths (earbones) can provide valuable information about stock structure and connectivity patterns among marine fish. For that, chemical signatures must be sufficiently distinct to allow accurate classification of an unknown fish to their area of origin. Here we have examined the suitability of otolith microchemistry as a tool to better understand the spatial dynamics of skipjack tuna (Katsuwonus pelamis), a highly valuable commercial species for which uncertainties remain regarding its stock structure in the Indian Ocean. For this aim, we have compared the early life otolith chemical composition of young-of-the-year (<6 months) skipjack tuna captured from the three main nursery areas of the equatorial Indian Ocean (West,... |
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| Ano: 2021 |
URL: https://archimer.ifremer.fr/doc/00687/79908/82810.pdf |
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| Darnaude, Audrey M.; Hunter, Ewan. |
| The oxygen isotopic ratio of fish otoliths is increasingly used as a 'natural tag' to assess provenance in migratory species, with the assumption that variations in delta O-18 values closely reflect individual ambient experience of temperature and/or salinity. We employed archival tag data and otoliths collected from a shelf-scale study of the spatial dynamics of North Sea plaice Pleuronectes platessa L., to examine the limits of otolith delta O-18-based geolocation of fish during their annual migrations. Detailed intra-annual otolith delta O-18 measurements for 1997-1999 from individuals of 3 distinct sub-stocks with different spawning locations were compared with delta O-18 values predicted at the monthly, seasonal and annual scales, using predicted... |
| Tipo: Text |
Palavras-chave: Fish migration; Oxygen; Stable isotopes; Natural tag; Site fidelity; Plaice; Pleuronectes platessa. |
| Ano: 2018 |
URL: https://archimer.ifremer.fr/doc/00626/73782/75084.pdf |
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