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Titolo:
CHARACTERIZATION OF SPANISH PYRENEAN STREAM HABITAT - RELATIONSHIPS BETWEEN FISH COMMUNITIES AND THEIR HABITAT
Autore:
DEJALON DG; MAYO M; MOLLES MC;
Indirizzi:
UNIV POLITECN MADRID,ESCUELA TECN SUPER INGENIEROS MONTES,LAB HIDROBIOL E-28040 MADRID SPAIN
Titolo Testata:
Regulated rivers
fascicolo: 2-3, volume: 12, anno: 1996,
pagine: 305 - 316
SICI:
0886-9375(1996)12:2-3<305:COSPSH>2.0.ZU;2-U
Fonte:
ISI
Lingua:
ENG
Soggetto:
POPULATION-SIZE; REMOVAL DATA; BROWN TROUT; RIFFLES; SALMON; POOLS;
Keywords:
HABITAT STRUCTURE; FISH COMMUNITIES; HABITAT CLASSIFICATION;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Science Citation Index Expanded
Citazioni:
40
Recensione:
Indirizzi per estratti:
Citazione:
D.G. Dejalon et al., "CHARACTERIZATION OF SPANISH PYRENEAN STREAM HABITAT - RELATIONSHIPS BETWEEN FISH COMMUNITIES AND THEIR HABITAT", Regulated rivers, 12(2-3), 1996, pp. 305-316

Abstract

Spanish Pyrenean streams are characterized by extreme summer drought and torrential flows during spring snowmelt and their fish communitiesare dominated by trout at high altitudes and by barbel in the lower reaches. The Instream Flow Incremental Methodology (IFIM) was adapted to analyse the fisheries habitat of Spanish streams. Parameters were developed that measure the particular characteristics of these streams, taking into account the habitat needs of the main developmental stages(adults, juveniles, fry and spawning) in different seasons. For this analysis 'potential habitat' was defined as that determined by hydraulics and geomorphological features. 'Real habitat used' was defined by the fish population characteristics (densities, biomass, age-structureand population dynamics). Habitat complexity was calculated as the diversity of habitats of different developmental stages and different species. Habitat conditions during summer-drought were analysed by the simulation of low flow conditions as measured by gauging stations. Habitat parameters were measured in several stream reaches and compared with the characteristics of the fish populations they supported by multivariate analysis. The results show that fish abundance increases downstream along the river continuum, indicating that the habitat carrying capacity increases downstream. The depth and rock surfaces are the main factors limiting the capacity of the stream to provide refuges. Trout populations are also influenced by submerged macrophytes. This IFIM evaluation of stream habitat was not correlated with fisheries features because factors other than hydraulics appear to limit trout population in the Pyrenean study streams. Hydraulic factors may limit the fishpopulations during brief periods, but population recovery from these disturbances may take longer than the time available between disturbances events.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 30/11/20 alle ore 17:05:20