@article{fdi:010076079,
  title = {{C}hanges in marine phytoplankton diversity : assessment under the marine strategy framework directive},
  author = {{R}ombouts, {I}. and {S}imon, {N}. and {A}ubert, {A}nais and {C}ariou, {T}. and {F}eunteun, {E}. and {G}uerin, {L}. and {H}oebeke, {M}. and {M}c{Q}uatters-{G}ollop, {A}. and {R}igaut-{J}alabert, {F}. and {A}rtigas, {L}. {F}.},
  editor = {},
  language = {{ENG}},
  abstract = {{T}he {M}arine {S}trategy {F}ramework {D}irective requires {EU} {M}ember {S}tates to assess the {G}ood {E}nvironmental {S}tatus ({GES}) of their marine waters in a coherent and strategic manner. {F}or the regional assessment of biodiversity, the {OSPAR} {I}ntersessional {C}oordination {G}roup of {B}iodiversity {A}ssessment and {M}onitoring ({ICG}-{COBAM}) provides substantial advice. {T}hrough expert working groups, phytoplankton indicators are currently being developed to measure the state and the change in pelagic diversity, to quantify food web dynamics and to measure the extent of eutrophication impacts. {W}e developed a multi-metric indicator that is compliant with the common {OSPAR} indicator "{C}hanges in plankton diversity" ({PH}3). {T}he aim was to describe the structure of the phytoplankton community (alpha diversity) and to detect significant temporal changes (beta diversity) to evaluate the health of pelagic habitats. {I}n this pilot study, we used three coastal time-series in the {W}estern {C}hannel and the north of the {B}ay of {B}iscay ({N}orth {A}tlantic, {F}rance) to test the efficiency and the performance of several existing diversity indices. {W}e validated two alpha diversity indices, namely the {M}enhinick {I}ndex ({D}) and the {H}ulburt {I}ndex (d), based on their complementary ecological information, their strong relationship with habitat characteristics, and their relative ease of interpretation for stakeholders. {T}emporal shifts or rate of change in community structure were detected by the {L}ocal {C}ontributions to {B}eta {D}iversity index ({LCBD}; a beta diversity measure). {F}or the years where significantly high {LCBD} values were found, the {I}mportance {V}alue {I}ndex ({IVI}) was calculated to potentially identify the taxa (genus) responsible for the "unusual" community structure. {F}or example, at the {O}uest {L}oscolo site in 2008, an elevated {LCBD} (0.45) coincided with a high dominance value ({H}ulburt's {I}ndex) caused by the occurrence of a monospecific bloom of {L}eptocylindrus spp. ({IVI} = 73%) in {J}uly (2.22 x 10(6) cells {L}-1) and {O}ctober (8 x 10(6) cells {L}-1). {I}n this way, {PH}3 informs on different aspects of phytoplankton diversity from a community to a genus level. {A}t the current stage of development, however, {PH}3 acts as a "surveillance" rather than an operational indicator since the relationship to {GES} is not directly tracked. {I}n the future, by additional testing of {PH}3 and extending the geographical scope, the robustness of the assessment could be further determined across the {OSPAR} {M}aritime {A}rea.},
  keywords = {{C}ommunity composition ; {G}ood {E}nvironmental {S}tatus ; {I}ndicators ; {M}arine policy ; {MSFD} ; {OSPAR} ; {P}elagic habitat ; {P}lankton ; {ATLANTIQUE} {NORD} ; {FRANCE} ; {BISCAYE} {BAIE}},
  booktitle = {},
  journal = {{E}cological {I}ndicators},
  volume = {102},
  numero = {},
  pages = {265--277},
  ISSN = {1470-160{X}},
  year = {2019},
  DOI = {10.1016/j.ecolind.2019.02.009},
  URL = {https://www.documentation.ird.fr/hor/fdi:010076079},
}