Percorrer por autor "Darnaude, Audrey M."
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- Jellyfish as an alternative source of food for opportunistic fishesPublication . Marques, Raquel; Bouvier, Corinne; Darnaude, Audrey M.; Molinero, Juan-Carlos; Przybyla, Cyrille; Soriano, Solenn; Tomasini, Jean-Antoine; Bonnet, DelphineAlthough 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, whose grazing pressure varies depending on the jellyfish life stage. Higher ingestion rates were observed on young stages (i.e. small medusa) indicating their higher vulnerability to fish predation and the potential negative impact this may have on Aurelia sp. population dynamics. These results provide new insights on the so far underestimated role fish predation can have on jellyfish population dynamics. In particular, opportunistic fish species, such as S. aurata may contribute to control jellyfish blooms, through top-down regulations of jellyfish biomass. (C) 2016 Elsevier B.V. All rights reserved.
- A systematic review of the current state of marine functional connectivity researchPublication . Tanner, Susanne E.; Sturrock, Anna M.; Öztürk, Rafet Ç.; Smoliński, Szymon; Terzi, Yahya; Reis-Santos, Patrick; Barboza, Francisco R.; Blanco, Andreu; Borsa, Philippe; Castilho, Rita; Costantini, Federica; Feyzioğlu, A. Muzaffer; Guizien, Katell; Guy-Haim, Tamar; Kaplan, David M.; Kotta, Jonne; Lett, Christophe; Martinho, Filipe; Nanninga, Gerrit B.; Pérez-Ruzafa, Angel; Rinkevich, Baruch; Walther, Benjamin D; Darnaude, Audrey M.Marine functional connectivity underpins biodiversity and ecosystem functions, en suring resilience in marine and land–sea interface ecosystems. Research on this topic has ad vanced rapidly in recent decades, as reflected in the growing body of primary literature and the increasing number of reviews covering a variety of topics and methodologies. Here, we systematically extracted and analysed information from 215 reviews across the entire field to synthesize the current state of marine functional connectivity research, highlighting the main topics, methods, taxa, geographic areas, and future research priorities. Word co-occurrence and network analyses revealed imbalances in review topics, with certain habitats (e.g. coral reefs), taxa (e.g. fish), and geo graphic areas (e.g. North Atlantic) receiving disproportionate attention. These disparities likely arise from variations in funding, field site accessibility, public interest, and/or delays in adopting new concepts and methodologies. Research priorities were broadly grouped into 2 themes: (1) ‘Methods’, highlighting the need to integrate and advance sampling, modelling, and ana lysis techniques, and (2) ‘Ecology and Application’, stressing the need to understand connectivity drivers, particularly the impacts of climate change, and to integrate connectivity knowledge into marine conservation and management. There was also a third overarching theme emphasizing the importance of expanding spatial and temporal coverage of connectivity knowledge and data by embracing new technologies, growing collaborative networks and targeting understudied habitats, areas, and taxa. Tackling the identified research priorities will further improve our ability to quantify connectivity patterns and drivers, and facilitate efforts to actively apply this knowledge and data in marine management and conservation.