@article {4725, title = {Nursery function of coastal temperate benthic habitats: New insight from the bivalve recruitment perspective}, journal = {Journal of Sea Research}, volume = {121}, year = {2017}, pages = {11-23}, abstract = {


Marine habitat function has been typically investigated in terms of biogeochemical regulation but rarely in terms of population renewal, which is mainly controlled by recruitment dynamics. The recruitment phase is crucial for
organisms with a bentho-pelagic life cycle, such as bivalves, and it regulates the population renewal success. This study provides new insight on the role of temperate benthic habitats on bivalve recruitment, as a function of
nursery areas. Six dominant benthic habitats of the Chausey archipelago (Normandy, France) were studied. In each habitat, bivalve recruit assemblages were described at the end of two reproductive seasons. Furthermore, Ostrea edulis
juveniles were immerged on each habitat during two months to compare growth performances and feeding status, estimated by fatty acid composition. Recruit assemblages differ from each habitat according to sediment grain-size composition and bathymetrical levels. Subtidal habitats, and especially Crepidula fornicata banks and Glycymeris glycymeris coarse sands, supported the highest species abundance and richness of recruits. All O. edulis juveniles fed on the same trophic resources but digestive glands of juveniles from C. fornicata banks were more concentrated in total fatty acids than those from subtidal G. glycymeris coarse sands and maerl banks. Our results depict the key role of subtidal and structured habitats, composed of ecosystem engineers, in enhancing bivalve recruitment and extending the bivalve population renewal. This study suggests that the crucial role of
these habitats as bivalve nurseries must be integrated in management perspectives

}, author = {Pierrick Barbier and Tarik Meziane and For{\^e}t, M and R{\'e}jean Tremblay and Robert, R and Fr{\'e}d{\'e}ric Olivier} } @article {4269, title = {Influence of intertidal recreational fisheries and {\textquoteleft}bouchot{\textquoteright} mussel culture on bivalve recruitment}, journal = {Marine Environmental Research}, volume = {117}, year = {2016}, pages = {1 - 12}, abstract = {

Abstract In coastal environments, fishing and aquaculture may be important sources of disturbance to ecosystem functioning, the quantification of which must be assessed to make them more sustainable. In the Chausey Archipelago, France, recreational fishing and commercial shellfish farming are the only two evident anthropogenic activities, dominated by bivalve hand-raking and {\textquoteleft}bouchot{\textquoteright} mussel culture, respectively. This study evaluates the impact of both activities on bivalve recruitment dynamics by comparing primary recruitment intensity (short-term effect) and recruitment efficiency (medium-term effect) by sampling bivalves in reference (undisturbed) and disturbed (i.e. subjected to hand-raking or in {\textquoteleft}bouchot{\textquoteright} mussel culture areas) parcels throughout and at the end of the recruitment season, respectively. Specific hypotheses evaluated were that (H1) bivalve hand-raking negatively affects bivalve recruitment and that (H2) {\textquoteleft}bouchot{\textquoteright} mussel culture promotes bivalve recruitment. Patterns in bivalve community structure in reference parcels (i.e. natural pattern) differed between initial and final recruitment, underlining the great importance of early post-settlement processes, particularly secondary dispersal. Primary recruitment intensity was inhibited in hand-raking parcels whereas it was promoted in {\textquoteleft}bouchot{\textquoteright} mussel culture parcels, but the effect on recruitment efficiency was muted for both activities due to post-settlement processes. Nevertheless, the importance of effects that occur during the first step of recruitment should not be ignored as they may affect bivalve communities and induce immediate consequences on the trophic web through a cascade effect. Finally, it is highlighted that hand-raking damages all life stages of the common cockle Cerastoderma edule, one of the major target species, suggesting that this activity should be managed with greater caution than is currently done.

}, keywords = {{\textquoteleft}Bouchot{\textquoteright}}, issn = {0141-1136}, doi = {http://dx.doi.org/10.1016/j.marenvres.2016.03.006}, url = {http://www.sciencedirect.com/science/article/pii/S0141113616300319}, author = {Nicolas Toupoint and Pierrick Barbier and R{\'e}jean Tremblay and P Archambault and Christopher W. McKindsey and Gesche Winkler and Tarik Meziane and Fr{\'e}d{\'e}ric Olivier} } @article {4260, title = {Spatial and temporal dynamics of nano- and pico-size particulate organic matter (POM) in a coastal megatidal marine system}, journal = {Limnology and Oceanography}, volume = {61}, year = {2016}, month = {05/2016}, pages = {1087-1100}, abstract = {

Surface water samples of size-selected seston (0.7{\textendash}20 μm) were collected from April 2013 to September 2013 at three similar coarse-sand benthic habitats. Additionally, seston sampling was performed at a fixed location throughout a complete tidal cycle (2014). A combination of fatty acid (FA), isotope, and flow cytometry analyses were used to determine the quality and quantity of nano- and pico-sized particulate organic matter (POM). High variability was found between fatty acid replicate samples. Similar temporal patterns were observed at two sheltered sites, while the exposed site displayed less pronounced seasonal changes. Lower concentrations of 16C and 18C polyunsaturated fatty acids were found during low tide sampling. Globally, POM was dominated by picoeukaryotes, with concentrations exceeding 50,000 cells mL-1, and (16:4ω3 + 18:3ω3)/Σω3 is proposed as novel biomarker of picoeukaryotes in this region.

}, issn = {1939-5590}, doi = {10.1002/lno.10276}, url = {http://dx.doi.org/10.1002/lno.10276}, author = {Moynihan, Molly A. and Pierrick Barbier and Fr{\'e}d{\'e}ric Olivier and Nicolas Toupoint and Tarik Meziane} }