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| Javidpour, Jamileh; Molinero, Juan-carlos; Ramírez-romero, Eduardo; Roberts, Patrick; Larsen, Thomas. |
| The proliferation of invasive marine species is often explained by a lack of predators and opportunistic life history traits. For the invasive comb jelly Mnemiopsis leidyi, it has remained unclear how this now widely distributed species is able to overcome long periods of low food availability, particularly in their northernmost exotic habitats in Eurasia. Based on both field and laboratory evidence, we show that adult comb jellies in the western Baltic Sea continue building up their nutrient reserves after emptying the prey field through a shift to cannibalizing their own larvae. We argue, that by creating massive late summer blooms, the population can efficiently empty the prey field, outcompete intraguild competitors, and use the bloom events to build... |
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| Ano: 2020 |
URL: https://archimer.ifremer.fr/doc/00628/74047/73454.pdf |
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| Durant, Joël M.; Molinero, Juan-carlos; Ottersen, Geir; Reygondeau, Gabriel; Stige, Leif Christian; Langangen, Øystein. |
| In high-latitude marine environments, primary producers and their consumers show seasonal peaks of abundance in response to annual light cycle, water column stability and nutrient availability. Predatory species have adapted to this pattern by synchronising life-history events such as reproduction with prey availability. However, changing temperatures may pose unprecedented challenges by decoupling the predator-prey interactions. Here we build a predator-prey model accounting for the full life-cycle of fish and zooplankton including their phenology. The model assumes that fish production is bottom-up controlled by zooplankton prey abundance and match or mismatch between predator and prey phenology, and is parameterised based on empirical findings of how... |
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| Ano: 2019 |
URL: https://archimer.ifremer.fr/doc/00588/70058/68001.pdf |
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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... |
| Tipo: Text |
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| Ano: 2019 |
URL: https://archimer.ifremer.fr/doc/00497/60902/66960.pdf |
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| Lebrato, Mario; Wang, Yiming V.; Tseng, Li-chun; Achterberg, Eric P.; Chen, Xue-gang; Molinero, Juan-carlos; Bremer, Karen; Westernstroeer, Ulrike; Soeding, Emanuel; Dahms, Hans-uwe; Kueter, Marie; Heinath, Verena; Joehnck, Janika; Konstantinou, Kostas I.; Yang, Yiing J.; Hwang, Jiang-shiou; Garbe-schoenberg, Dieter. |
| Shallow hydrothermal vents are of pivotal relevance for ocean biogeochemical cycles, including seawater dissolved heavy metals and trace elements as well as the carbonate system balance. The Kueishan Tao (KST) stratovolcano off Taiwan is associated with numerous hydrothermal vents emitting warm sulfur-rich fluids at so-called White Vents (WV) and Yellow Vent (YV) that impact the surrounding seawater masses and habitats. The morphological and biogeochemical consequences caused by a M5.8 earthquake and a C5 typhoon ("Nepartak") hitting KST (12th May, and 2nd-10th July, 2016) were studied within a 10-year time series (2009-2018) combining aerial drone imagery, technical diving, and hydrographic surveys. The catastrophic disturbances triggered landslides that... |
| Tipo: Text |
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| Ano: 2019 |
URL: https://archimer.ifremer.fr/doc/00593/70518/68670.pdf |
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| López-abbate, M.c.; Molinero, Juan-carlos; Barría De Cao, M.s.; Silva, R.; Negri, R.; Guinder, V.a.; Hozbor, M.c.; Hoffmeyer, M.s.. |
| Eutrophication is the most widespread effect of urban development in coastal areas. To elucidate how nutrient loading affects the carbon pathways at the base of food chains, we quantified the carbon transfer among microbial components, from prokaryotes to microzooplankton. For this purpose, we performed two size-fractionation feeding experiments during late summer under moderate (N: 28.5 μM, P: 0.92 μM, Si: 45.8 μM) and severe (N: 173.9 μM, P: 3.5 μM, Si: 67.2 μM) cultural eutrophication in the Bahía Blanca Estuary (Argentina). In both experiments, prokaryotes were largely dominated by heterotrophic forms, small diatoms dominated among autotrophs, and heterotrophic nanoflagellates were the most abundant among protistan grazers. Under severe eutrophication,... |
| Tipo: Text |
Palavras-chave: Eutrophication; Microbial food web; Bacteria; Nanoflagellates; Microzooplankton; Estuaries. |
| Ano: 2019 |
URL: https://archimer.ifremer.fr/doc/00512/62335/66718.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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| López-abbate, M. Celeste; Molinero, Juan-carlos; Perillo, Gerardo M.e.; Barría De Cao, M. Sonia; Pettigrosso, Rosa E.; Guinder, Valeria A.; Uibrig, Roman; Berasategui, Anabela A.; Vitale, Alejandro; Marcovecchio, Jorge E.; Hoffmeyer, Mónica S.. |
| Planktonic ciliates constitute a fundamental component among microzooplankton and play a prominent role in carbon transport at the base of marine food webs. How these organisms respond to shifting environmental regimes is unclear and constitutes a current challenge under global ocean changes. Here we examine a multiannual field survey covering 25 years in the Bahía Blanca Estuary (Argentina), a shallow, flood-plain system dominated by wind and tidal energy. We found that the estuary experienced marked changes in wind dominant regimes and an increase in water turbidity driven from the joint effect of persistent long-fetch winds and the indirect effect of the Southern Annular Mode. Along with these changes, we found that zooplankton components, i.e. ciliates... |
| Tipo: Text |
Palavras-chave: Tintinnids; Oligotrichs; Acartia tonsa; Wind; Turbidity; Estuaries. |
| Ano: 2019 |
URL: https://archimer.ifremer.fr/doc/00471/58252/60760.pdf |
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| Ramírez-romero, Eduardo; Molinero, Juan-carlos; Sommer, Ulrich; Salhi, Noussaiba; Kéfi - Daly Yahia, Ons; Daly Yahia, Mohamed Néjib. |
| Structural changes in plankton primary producers have large implications for food web dynamics, energy fluxes and the vertical export of biogenic particulate carbon. Here we examine phytoplankton data spanning the period 1993–2008 from the Bay of Tunis, southwestern Mediterranean Sea, in relation to long term hydroclimate variability. We show a conspicuous shift in the structure of the phytoplankton community characterized by an increase of small-sized species and diversity loss, revealing a dominance of smaller blooming diatoms and cyanobacteria. Such changes were concurrent with marked modifications in hydroclimatic patterns experienced in the Bay of Tunis consisting of a shift towards enhanced winter precipitation together with rising temperatures. This... |
| Tipo: Text |
Palavras-chave: Size structural changes; Diversity loss; Ocean warming; Nanophytoplankton; Phytoplankton diversity; Southwestern mediterranean. |
| Ano: 2020 |
URL: https://archimer.ifremer.fr/doc/00602/71405/76566.pdf |
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| Gueroun, Sonai M; Molinero, Juan-carlos; Piraino, Stefano; Dali Yahia, Mohamed Nejib. |
| Understanding the life cycle strategies and predatory impact of alien jellyfish species is critical to mitigate the impact that these organisms may have on local populations, biodiversity, and ultimately on the functioning of food webs. In the Mediterranean Sea, little is known about the dynamics of alien jellyfish, despite this biodiversity hotspot being one of the most threatened areas by increasing numbers of alien jellyfish. Here, we investigated the population dynamics and predatory impact of a non-indigenous scyphomedusa, Aurelia solida Browne 1905, in the Bizerte Lagoon, Tunisia. The study was based on bimonthly surveys performed over two consecutive years, from November 2012 to August 2014. Field observations showed that the planktonic phase of A.... |
| Tipo: Text |
Palavras-chave: Scyphomedusae; Abundance; Predation; Mesozooplankton; SW Mediterranean. |
| Ano: 2020 |
URL: https://archimer.ifremer.fr/doc/00624/73577/72966.pdf |
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