@inproceedings{fdi:010072113,
  title = {{A}nalysis of zooplankton samples from {AWA} scientific research on board of {R}/{V} {T}halassa 2014 using the zooscan approach [r{\'e}sum{\'e}]},
  author = {{R}odrigues, {E}. and {K}iko, {R}. and {B}rehmer, {P}atrice and {M}achu, {E}ric and {S}ilva, {O}.},
  editor = {},
  language = {{ENG}},
  abstract = {{Z}ooplankton organisms are crucial in nutrient cycling and energy transport, as they constitute the largest marine animal biomass and represent the main link between phytoplankton and other secondary consumers. {Z}ooplankton is dominated by copepods and in many cases the {C}alanoids stand out by the number of species and/or biomass. {I}n 2014 a scientific research was carried out along the coast of {W}est {A}frica ({M}auritania, {S}enegal and {G}ambia) on board of {R}/{V} {T}halassa. {Z}ooplankton samples were collected at day and night at 4 different stations along a coast-to-open ocean transect (station 1 inshore, station 4 offshore from {R}3) and 5 different depths using a multinet. {S}amples were analysed at the {INDP} laboratory using the zooscan approach. {I}n short, the samples were fractionated into three size fractions (small < 500; medium 500-1000; and large > 1000 microm{\`e}tres) and imaged using a flatbed scanner. "{V}ignettes" small thumbnails and image characteristics of all objects were extracted from the image data with {Z}oo{P}rocess and sorted into 39 categories using {P}lankton {I}dentifier and then manually validated. {C}opepods represented 91% of the total abundance; gelatinous organisms such as siphonophores, chaetognaths, salps and, appendicularians represented 5%; other crustaceans, such as euphausiids, ostracods, amphipods and decapods 2%; eggs and molluscs 1%. {A}t the copepod level, calanoids were the most dominante group (total abundance percentage 88%), followed by cyclopoid and harpacticoid copepods (6%). {E}ach oithonidae and eucalanidae families were (2%), oncaeaidae (1%) and nauplius copepods were 1%. {I}n general, the total abundance of copepods differed spatially and along the water column. {T}his may have to do with the biotic processes (e.g {C}hla) and abiotic (e.g the distance from the coast to the open ocean). {T}he stations 1 and 2, the most inshore were those that presented greater abundances. {T}he highest variations were observed 0 to 100m depth. {T}he vertical distribution was used to detect migration patterns like diel vertical migration ({DVM}), which was mostly detected in the large fraction. {F}or this fraction, the "normal" {DVM} (up at night and down during the day) was visible at stations 2 and 3, where the large copepods aggregated at the 25 to 50, and the 0 to 50 m depth level, respectively during nighttime. {A}t station 1, large copepods were found to be almost homogeneously distributed in the water column during daytime, whereas they also aggregated at the 25 to 50 m depth layer during nighttime. {F}urther analysis of the data is ongoing and will resolve particulate and dissolved matter fluxes related to these migrations, but also can inform ecosystem modelling efforts.},
  keywords = {{SENEGAL} ; {MAURITANIE} ; {GAMBIE} ; {ATLANTIQUE}},
  numero = {},
  pages = {46--47},
  booktitle = {{I}nternational conference {ICAWA} 2016 : extended book of abstract : the {AWA} project : ecosystem approach to the management of fisheries and the marine environment in {W}est {A}frican waters},
  year = {2017},
  ISBN = {978-2-9553602-0-5},
  URL = {https://www.documentation.ird.fr/hor/fdi:010072113},
}