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| Titel |
A novel approach to analysing the regimes of temporary streams in relation to their controls on the composition and structure of aquatic biota |
| VerfasserIn |
F. Gallart, N. Prat, E. M. García-Roger, J. Latron, M. Rieradevall, P. Llorens, G. G. Barberá, D. Brito, A. M. Girolamo, A. Porto, A. Buffagni, S. Erba, R. Neves, N. P. Nikolaidis, J. L. Perrin, E. P. Querner, J. M. Quiñonero, M. G. Tournoud, O. Tzoraki, N. Skoulikidis, R. Gómez, M. M. Sánchez-Montoya, J. Froebrich |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1027-5606
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| Digitales Dokument |
URL |
| Erschienen |
In: Hydrology and Earth System Sciences ; 16, no. 9 ; Nr. 16, no. 9 (2012-09-06), S.3165-3182 |
| Datensatznummer |
250013461
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| Publikation (Nr.) |
 copernicus.org/hess-16-3165-2012.pdf |
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| Zusammenfassung |
| 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. |
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