@article{fdi:010041614,
  title = {{C}hanges of taxonomic and trophic structure of fish assemblages along an environmental gradient in the {U}pper {B}eni watershed ({B}olivia)},
  author = {{P}ouilly, {M}arc and {B}arrera, {S}. and {R}osales, {C}.},
  editor = {},
  language = {{ENG}},
  abstract = {{T}he distribution and the diet of 28 fish species were evaluated, during the dry season, in 12 streams of the {U}pper {B}eni watershed ({A}mazon basin, {B}olivia). {T}he 12 streams were of similar size (stream width and water depth) but situated on a gradient of altitude in the {A}ndean and sub-{A}ndean areas. {T}he environmental conditions in the stream changed in relation to the altitude. {A}s altitude decreased, slope and water velocity also decreased, while temperature, conductivity, p{H} and the proportion of pools increased. {A}lthough the diets of the species were mainly based on two aquatic autochthonous food resources, invertebrates and sediment, species were classified into five trophic guilds: detritivores, algivores, piscivores, invertivores-omnivores and aquatic specialist invertivores. {I}n all streams invertivores dominated or co-dominated with detritivores. {T}he trophic structure of the assemblages, however, changed in relation to the environmental gradient. {T}he fish species richness increased and the trophic composition became more diverse at lower altitudes, when slope decreased and temperature increased. {A}t the same time, the relative number of invertivore species decreased, whereas the relative number of detritivore, algivore and piscivore species increased. {D}ecreasing altitude appeared to play a role similar to increasing stream size along the longitudinal gradient. {T}his could be explained by geomorphological and temperature variations that may generate environmental conditions favourable to an increase of productivity. (c) 2006 {T}he {F}isheries {S}ociety of the {B}ritish {I}sles.},
  keywords = {altitude ; {A}mazonian {A}ndes ; fish diet ; guilds ; slope ; temperature},
  booktitle = {},
  journal = {{J}ournal of {F}ish {B}iology},
  volume = {68},
  numero = {1},
  pages = {137--156},
  ISSN = {0022-1112},
  year = {2006},
  DOI = {10.1111/j.0022-1112.2006.00883.x},
  URL = {https://www.documentation.ird.fr/hor/fdi:010041614},
}