@article{fdi:010082594,
  title = {{A}quatic biota responses to temperature in a high {A}ndean geothermal stream},
  author = {{Q}uenta-{H}errera, {E}. and {D}aza, {A}. and {L}azzaro, {X}avier and {J}acobsen, {D}. and {D}angles, {O}livier and {C}auvy-{F}raunie, {S}.},
  editor = {},
  language = {{ENG}},
  abstract = {{T}he impact of global warming on mountain ecosystems is predicted to be high, and particularly in the tropical region. {G}eothermal streams have provided comprehensive evidence about how aquatic biodiversity changes across natural thermal gradients, but current knowledge is restricted to arctic and temperate zones. {T}hermal tolerances are different in tropical biological communities, resulting in high thermal sensitivity and low capacity to endure change in their thermal environments. {T}his feature can change the response of aquatic organisms to warming, yet there is little empirical evidence to support this assumption. {I}n this study, we address this issue by evaluating how water temperature affects biodiversity, and the structure of primary and secondary producers of a high-elevation geothermal stream system (4,500 m above sea level) in the {B}olivian {A}ndes. {W}e analysed multi-taxa responses to increased water temperature using benthic macroinvertebrate families, benthic algae and cyanobacteria, fishes, and macrophytes as study organisms. {D}ifferent models were run to assess the response of aquatic biota to temperature. {I}n addition, threshold indicator taxa analysis was used to identify changes in macroinvertebrate taxa distributions along the thermal gradient. {W}e found that macroinvertebrate richness decreased at 24-25 degrees {C} due to the different taxon-specific responses to temperature. {T}hreshold indicator taxa analysis identified 17 temperature thresholds for each family of macroinvertebrates. {C}hanges in macroinvertebrate community composition were significantly associated with changes in water temperature. {S}imilarly, changes in macrophytes were associated with temperature differences, and high macrophyte richness was found at 19-20 degrees {C}. {C}hlorophyll-a concentration of green algae and diatoms was higher at intermediate temperatures 20-22 degrees {C}, macroinvertebrates density peaked at 27 degrees {C}, and fish body size reduced linearly with temperature. {T}emperature increase in the geothermal stream resulted in a reduction of aquatic diversity and primary and secondary producers by simplifying the community structure to a few warm-adapted taxa and reduced body size. {T}hese patterns differed from those obtained in temperate/arctic geothermal streams, but are similar to other studies at high-elevation. {I}n a context of increasing warming, the ecological structure of high-elevation streams might lose cold-adapted taxa, and change to smaller populations. {A}dditional studies based on ecosystem functioning of geothermal streams could lead to a better understanding on how warming affects high-elevation streams.},
  keywords = {aquatic organisms ; geothermal streams ; temperature ; thresholds ; tropical ; {A}ndes ; {BOLIVIE} ; {ANDES} ; {ZONE} {TROPICALE} ; {SAJAMA} {PARC} {NATIONAL}},
  booktitle = {},
  journal = {{F}reshwater {B}iology},
  volume = {66},
  numero = {10},
  pages = {1889--1900},
  ISSN = {0046-5070},
  year = {2021},
  DOI = {10.1111/fwb.13798},
  URL = {https://www.documentation.ird.fr/hor/fdi:010082594},
}