Grups de recerca > Biofilm pigments in temporary streams indicate duration and severity of drying
Anar al contingut (clic a Intro)
UdG Home UdG Home
Tancar
Menú

Grup de Recerca en Ecologia Aquàtica (EcoAqua)

Biofilm pigments in temporary streams indicate duration and severity of drying

Increased duration and frequency of droughts under global change may affect both temporary and formerly permanent watercourses.

Increased duration and frequency of droughts under global change may affect both temporary and formerly permanent watercourses.

Streambed desiccation, cooccurring solar radiation, and high temperature all may affect the composition and metabolism of photoautotrophic organisms in benthic biofilms. To test these effects, we characterized the composition of pigments when biofilms were exposed to dry conditions, and compared this to pigments measured after flow resumed, as well as to others measured from permanent streams in the same region.

This comparison revealed important differences in pigmentary composition based on flow conditions. Active chlorophylls decreased exponentially with the duration and severity of the nonflow period, while chlorophyll degradation products and protective carotenoids increased. Streams experiencing longer and more severe nonflow periods showed the highest dissimilarities in their biofilm pigmentary composition, and this pattern was maintained after flow resumed.

Our results pointed to duration of nonflowing periods as the major driver of pigmentary composition, regardless of whether these were interrupted or not by short intervals of water flows. Multivariate changes in pigmentary composition between sampling periods highlighted the influence of the long-term hydrological history on the relative abundance of different taxonomic groups and their associated pigments.

Overall, pigmentary fingerprints are informative of the biofilm capacity to resist water flow interruption and of their ability to recover after water flow returns.

Colls, M., Timoner, X., Font, C., Acuña, V., & Sabater, S.

Biofilm pigments in temporary streams indicate duration and severity of drying. Limnology and Oceanography: in press.

DOI: https://doi.org/10.1002/lno.11881

Notícies relacionades

Escull quins tipus de galetes acceptes que el web de la Universitat de Girona pugui guardar en el teu navegador.

Les imprescindibles per facilitar la vostra connexió. No hi ha opció d'inhabilitar-les, atès que són les necessàries pel funcionament del lloc web.

Permeten recordar les vostres opcions (per exemple llengua o regió des de la qual accediu), per tal de proporcionar-vos serveis avançats.

Proporcionen informació estadística i permeten millorar els serveis. Utilitzem cookies de Google Analytics que podeu desactivar instal·lant-vos aquest plugin.

Per a oferir continguts publicitaris relacionats amb els interessos de l'usuari, bé directament, bé per mitjà de tercers (“adservers”). Cal activar-les si vols veure els vídeos de Youtube incrustats en el web de la Universitat de Girona.