Publications des scientifiques de l'IRD

Cereghino R., Francoise L., Bonhomme C., Carrias J. F., Compin A., Corbara B., Jassey V., Leflaive J., Rota T., Farjalla V., Leroy Céline. (2020). Desiccation resistance traits predict freshwater invertebrate survival and community response to drought scenarios in a Neotropical ecosystem. Ecological Indicators, 119, p. 106839 [9 p.]. ISSN 1470-160X.

Titre du document
Desiccation resistance traits predict freshwater invertebrate survival and community response to drought scenarios in a Neotropical ecosystem
Année de publication
2020
Type de document
Article référencé dans le Web of Science WOS:000579817600052
Auteurs
Cereghino R., Francoise L., Bonhomme C., Carrias J. F., Compin A., Corbara B., Jassey V., Leflaive J., Rota T., Farjalla V., Leroy Céline
Source
Ecological Indicators, 2020, 119, p. 106839 [9 p.] ISSN 1470-160X
The intensification of dry seasons is a major threat to freshwater biodiversity in Neotropical regions. Little is known about resistance to drying stress and the underpinning traits in Neotropical freshwater species, so we don't know whether desiccation resistance allows to anticipate shifts in biological diversity under future climate scenarios. Here, we used the aquatic invertebrates that live in the rainwater-filled leaves of tank bromeliads, to examine the extent to which desiccation resistance of species measured in the laboratory predicts community response to drought intensification in nature. We measured desiccation resistance in 17 invertebrate species (> 90% of the biomass usually found in bromeliads of French Guiana) by recording the median lethal time (LT50) of experimental populations exposed to controlled conditions of residual moisture. In the field, we placed rainshelters above tank bromeliads to emulate drought scenarios ranging from the ambient norm to IPCC scenarios and extreme events, and we recorded the response of functional community structure. LT50 ranged from 4.18 to 19.06 days, and was related to cuticle content and dry body mass. Among other functional indicators that represent strategies to optimize resource use under stressful conditions (e.g., habitat use, trophic specialization), LT50 was the best predictor of community structure responses along a gradient of emulated drought intensities. Therefore, species' LT5Os measured under laboratory conditions can be used to forecast aquatic community response to drying stress in nature. Anticipating how species will cope with drought has never been more important for environmental managers to support climate change adaptation. We show that desiccation resistance in freshwater invertebrates is a key indicator of potential population size and local-global range shifts, and this could be especially true in the Neotropics where species have narrow physiological tolerances for climatic variation.
Plan de classement
Sciences du milieu [021] ; Limnologie biologique / Océanographie biologique [034] ; Etudes, transformation, conservation du milieu naturel [082]
Description Géographique
GUYANE FRANCAISE
Localisation
Fonds IRD [F B010079925]
Identifiant IRD
fdi:010079925
Contact