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Titolo:
FOOD-WEB INFLUENCES ON FISH POPULATION RE SPONSES TO INSTREAM FLOW
Autore:
ORTH DJ;
Indirizzi:
VIRGINIA POLYTECH INST & STATE UNIV,DEPT FISHERIES & WILDLIFE SCI BLACKSBURG VA 24061
Titolo Testata:
Bulletin francais de la peche et de la pisciculture
fascicolo: 337-9, , anno: 1995,
pagine: 317 - 328
SICI:
0767-2861(1995):337-9<317:FIOFPR>2.0.ZU;2-K
Fonte:
ISI
Lingua:
FRE
Soggetto:
WARMWATER STREAM; SMALLMOUTH BASS; HABITAT; REQUIREMENTS; PERSPECTIVE; COMMUNITIES; DISTURBANCE; ASSEMBLAGE; CALIFORNIA; ECOSYSTEMS;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
68
Recensione:
Indirizzi per estratti:
Citazione:
D.J. Orth, "FOOD-WEB INFLUENCES ON FISH POPULATION RE SPONSES TO INSTREAM FLOW", Bulletin francais de la peche et de la pisciculture, (337-9), 1995, pp. 317-328

Abstract

Fish population responses to changes in streamflow have seldom been correctly forecasted from physical habitat predictions. Yet, practical instream flow assessments rely on analyses of physical habitat dynamics, which are presumed to influence fish populations. This leads to theinstream flow dilemma : how many species and life stages to analyze and how to weight the importance of each. In some streams, PHABSIM (Physical Habitat Simulation) analyses for common warmwater fishes indicate that weighted usable area is either insensitive or maximized at low flows. However, average to high flows are undoubtedly important for a variety of reasons, such as recruitment of floodplain tree species, streambed scouring, organic matter inputs, and benthic invertebrate production. Density, diversity, and production of aquatic insects in a variety of streams show considerable annual and spatial variation, often directly attributable to streamflow. Similarly, growth and foraging success of fishes varies due to prey abundance. A food web model was developed to investigate the influence of the food base (aquatic insects,small prey fishes, and crayfish) on production of key predatory fishes (smallmouth bass Micropterus dolomieu, rock bass Ambloplites rupestris, and flathead catfish Pylodictis olivaris) in a large warmwater stream. Analysis of the model suggested that the production and yield of the fishes were strongly dependent on the bottom-up influence of prey,primarily aquatic insects and crayfish. From model analyses and review of studies on insect production and foraging success of fish, hypothesize that decreases in flow during the growing season may decrease insect production and, thereby, indirectly depress sport fish production. Practical instream flow assessments and research should address (1) broader array of taxa, especially suspected sensitive species, (2) appropriateness of meso-scale habitat analyses, (3) indirect effects of flow on the trophic structure, (4) rigorous testing and refinement of habitat suitability criteria, and (5) efficacy of individual-based models for evaluating alternative flow regimes.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 14/07/20 alle ore 13:00:35