A novel approach to analysing the regimes of temporary streams in relation to their controls on the composition and structure of aquatic biota

F. Gallart, N. Prat, E.M. Garcia-Roger, J. Latron, M. Rieradevall, P. Liorens, G.G. Barbera, D. Brito, A. De Girolamo, A. Lo Porto, A. Buffagni, S. Erba, R. Neves, N.P. Nikolaidis, L. Perrin, E.P. Querner, J.M. Quinonero, M.G. Tournoud, O. Tzoraki, N. SkoulikidisR. Gomez, M.M. Sanchez-Montoya, J. Froebrich

Research output: Contribution to journalArticleAcademicpeer-review

98 Citations (Scopus)

Abstract

Temporary streams are those water courses that undergo the recurrent cessation of flow or the complete drying of their channel. The structure and composition of biological communities in temporary stream reaches are strongly dependent on the temporal changes of the aquatic habitats determined by the hydrological conditions. Therefore, the structural and functional characteristics of aquatic fauna to assess the ecological quality of a temporary stream reach cannot be used without taking into account the controls imposed by the hydrological regime. This paper develops methods for analysing temporary streams' aquatic regimes, based on the definition of six aquatic states that summarize the transient sets of mesohabitats occurring on a given reach at a particular moment, depending on the hydrological conditions: Hyperrheic, Eurheic, Oligorheic, Arheic, Hyporheic and Edaphic. When the hydrological conditions lead to a change in the aquatic state, the structure and composition of the aquatic community changes according to the new set of available habitats. We used the water discharge records from gauging stations or simulations with rainfall-runoff models to infer the temporal patterns of occurrence of these states in the Aquatic States Frequency Graph we developed. The visual analysis of this graph is complemented by the development of two metrics which describe the permanence of flow and the seasonal predictability of zero flow periods. Finally, a classification of temporary streams in four aquatic regimes in terms of their influence over the development of aquatic life is updated from the existing classifications, with stream aquatic regimes defined as Permanent, Temporary-pools, Temporary-dry and Episodic. While aquatic regimes describe the long-term overall variability of the hydrological conditions of the river section and have been used for many years by hydrologists and ecologists, aquatic states describe the availability of mesohabitats in given periods that determine the presence of different biotic assemblages. This novel concept links hydrological and ecological conditions in a unique way. All these methods were implemented with data from eight temporary streams around the Mediterranean within the MIRAGE project. Their application was a precondition to assessing the ecological quality of these streams.
Original languageEnglish
Pages (from-to)3165-3182
JournalHydrology and Earth System Sciences
Volume16
Issue number9
DOIs
Publication statusPublished - 2012

Keywords

  • benthic macroinvertebrate assemblages
  • mediterranean streams
  • intermittent streams
  • community structure
  • ephemeral channels
  • habitat features
  • fish assemblages
  • flow permanence
  • river health
  • drought

Fingerprint

Dive into the research topics of 'A novel approach to analysing the regimes of temporary streams in relation to their controls on the composition and structure of aquatic biota'. Together they form a unique fingerprint.

Cite this