Decline of Native Freshwater Fishes in a Mediterranean Watershed on the Iberian Peninsula: A Quantitative Assessment
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We examined changes in the distribution of 9 native and 18 introduced freshwater fishes in the south-eastern Pyrenees watershed, Iberian Peninsula, using data from 1996, 1984–1988 and historical information. This region suffers many modifications to its freshwater ecosystems that are linked to human activity in the Mediterranean regions. Fish communities, stream physical habitat and environmental degradation were assessed at 168 sites from 11 basins in 1996. Seven native species (78%) showed decline from previous data, one of which became extirpated in the first half of the 20th century. On the other hand, introduced species are expanding. As a consequence, intact native communities are increasingly rare, declining from presence in 22% of river courses in 1984–1988 to 15% in 1996. The most typical community type is a mixture of native and introduced species occupying 30% of river courses. Stream degradation seems to be the main cause of this process because fish communities differed between degraded streams and streams suffering less impact. A principal component analysis showed that water pollution and modifications to the habitat were the two anthropogenic factors that accounted for most changes in the fish community integrity. Habitat alteration, primarily through construction of dams and water diversions, has fragmented habitats and isolated native fish communities in headwater streams. Current protection measures do not offer effective conservation of threatened species and communities. A global conservation and restoration programme from an ecosystem-based approach is essential to reverse the trend affecting native freshwater fishes in this Mediterranean region.
- Alvarez, M., A. Rubio & P. Muñoz. 1992. Eutrophication in Spanish freshwater ecosystems. Limnetica 8: 263–266.
- Angermeier, P.L. & I.J. Schlosser. 1995. Conserving aquatic biodiversity: beyond species and populations. Amer. Fish. Soc. Symposium 17: 402–414.
- Aparicio, E. & A. de Sostoa. 1998. Reproduction and growth of Barbus haasi in a small stream in the N.E. of the Iberian peninsula. Arch. Hydrobiol. 142: 95–110.
- Bianco, P.G. 1995. Mediterranean endemic freshwater fishes of Italy. Biol. Conserv. 72: 159–170.
- Brown, L.R. & P.B. Moyle. 1997. Invading species in the Eel River, California: successes, failures, and relationships with resident species. Env. Biol. Fish. 49: 271–291.
- Changeux, T. & D. Pont. 1995. Current status of the riverine fishes of the French Mediterranean basin. Biol. Conserv. 72: 137–158.
- Côté, I.M, D. Vinyoles, J.D. Reynolds, I. Doadrio & A. Perdices. 1999. Potential impacts of gravel extraction on Spanish populations of river blennies Salaria fluviatilis (Pisces, Blenniidae). Biol. Conserv. 87: 359–367.
- Detenbeck, N.E., P.W. DeVore, G.J. Niemi & A. Lima. 1992. Recovery of temperate-stream fish communities from disturbance: a review of case studies and synthesis of theory. Environmental Management 16: 33–53.
- Doadrio, I. 1988. Delimitation of areas in the Iberian Peninsula on the basis of freshwater fishes. Bonner Zoologische Beiträge 39: 113–128.
- Elvira, B. 1995. Conservation status of endemic freshwater fish in Spain. Biol. Conserv. 72: 129–136.
- Elvira, B. 1998. Impact of introduced fish on the native freshwater fish fauna of Spain. pp. 186–190. In: I.G. Cowx (ed.) Stocking and Introduction of Fish, Fishing New Books, Oxford.
- Frissell, C.A. 1993. Topology of extinction and endangerment of native fishes in the Pacific Northwest and California (U.S.A.). Conserv. Biol. 7: 342–354.
- Fruget, J.F. 1992. Ecology of the lower Rhône after 200 years of human influence: a review. Regulated Rivers: Research and Management 7: 233–246.
- García-Marín, J.L., P.E. Jorde, N. Ryman, F. Utter & C. Pla. 1991. Management implications of genetic differentiation between native and hatchery populations of brown trout (Salmo trutta) in Spain. Aquaculture 95: 235–249.
- Godinho, F.N. & M.T. Ferreira. 1998. The relative influence of exotic species and environmental factors on an Iberian native fish community. Env. Biol. Fish. 51: 41–51.
- Karr, J.R. 1981. Assessment of biotic integrity using fish communities. Fisheries 6: 21–27. CrossRef
- Karr, J.R., L.A. Toth & D.R. Dudley. 1985. Fish communities of midwestern rivers: a history of degradation. Bioscience 35: 90–95.
- López-Martín, J.M., J. Ruiz-Olmo & A. Borrell. 1995. Levels of organochlorine compounds in freshwater fish from Catalonia, N.E. Spain. Chemosphere 31: 3523–3535.
- Lyons, J. 1992. The length of stream to sample with a towed electrofishing unit when fish species richness is estimated. N. Amer. J. Fish. Manag. 12: 198–203.
- Minckley, W.L. & G.K. Meffe. 1987. Differential selection by flooding in stream-fish communities of the arid American Southwest. pp. 93–104. In: W.J. Matthews & D.C. Heins (ed.) Community and Evolutionary Ecology of North American Stream Fishes, University of Oklahoma Press, Norman.
- Minns, C.K. 1987. A method of ranking species and sites for conservation using presence-absence data and its application to native freshwater fish in New Zealand. New Zealand J. Zool. 14: 43–49.
- Moyle, P.B. 1995. Conservation of native freshwater fishes in the Mediterranean-type climate of California, USA: a review. Biol. Conserv. 72: 271–279.
- Moyle, P.B. & T. Light. 1996. Fish invasions in California: do abiotic factors determine success? Ecology 77: 1666–1670.
- Moyle, P.B. & J.E. Williams. 1990. Biodiversity loss in the temperate zone: decline of the native fish fauna of California. Conserv. Biol. 4: 275–284.
- Nicola, G.G., B. Elvira & A. Almodóvar. 1996. Dams and fish passage facilities in the large rivers of Spain: effects on migratory species. Arch. Hydrobiol./Suppl. 113: 375–379.
- Noss, R.F. & B. Csuti. 1994. Habitat fragmentation. pp. 237–264. In: G.K. Meffe & R.C. Carroll (ed.) Principles of Conservation Biology, Sinauer Associates, Sunderland.
- Ross, S.T. 1991. Mechanisms structuring stream fish assemblages: are there lessons from introduced species? Env. Biol. Fish. 30: 359–368.
- Sedell, J.R., G.H. Reeves, F.R. Hauer, J.A. Stanford & C.P. Hawkins. 1990. Role of refugia in recovery from disturbances: modern fragmented and disconnected river systems. Environmental Management 14: 711–724.
- Sostoa, A. de & J. Lobón-Cerviá. 1989. Fish and fisheries of the River Ebro: actual state and recent history. pp. 233–247. In: G.E. Petts (ed.) Historical Changes of Large Alluvial Rivers: Western Europe, John Wiley and Sons, Chichester.
- Sostoa, A. de. 1990. Història natural dels països Catalans: peixos (Natural history of Catalan countries: fishes). Enciclopèdia Catalana, Barcelona. 487 pp.
- Vane-Wright, R.I., C.J. Humphries & P.H. Williams. 1991. What to protect? Systematics and the agony of choice. Biol. Conserv. 55: 235–254.
- Vargas, M.J. & A. de Sostoa. 1997. Life-history pattern of the Iberian toothcarp Aphanius iberus (Pisces, Cyprinodontidae) from a Mediterranean estuary, the Ebro delta (Spain). Netherlands J. Zool. 47: 143–160.
- Wichert, G.A. & D.J. Rapport. 1998. Fish community structure as a measure of degradation and rehabilitation of riparian systems in an agricultural drainage basin. Environmental Management 22: 425–443.
- Decline of Native Freshwater Fishes in a Mediterranean Watershed on the Iberian Peninsula: A Quantitative Assessment
Environmental Biology of Fishes
Volume 59, Issue 1 , pp 11-19
- Cover Date
- Print ISSN
- Online ISSN
- Kluwer Academic Publishers
- Additional Links
- environmental degradation
- endangered species
- introduced species
- Author Affiliations
- 1. Departament Biologia Animal (Vertebrats), Facultat de Biologia, Universitat de Barcelona, Avda. Diagonal 645, 08028, Barcelona, Spain
- 2. Departament Biologia Animal (Vertebrats), Facultat de Biologia, Universitat de Barcelona, Avda. Diagonal 645, 08028, Barcelona, Spain