Morphology and quantitative analysis of fluvial erosion systems in the hydrological network of the Basque Country autonomous region

Knowl. Managt. Aquatic Ecosyst.

Antón

2009

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Key-words:native freshwater crayfish, SWOT analysis, Iberian Peninsula, threatened species, managementThe white-clawed freshwater crayfish Austropotamobius italicus is listed as "vulnerable" in the Spanish Red List of threatened species, but local legislation varies among Spanish regions. Thus, while in some places the species is classified as "in risk of extinction" and various plans of conservation and restoration have been implemented, in the Basque Country and other regions the species is not listed. The distribution of the whiteclawed crayfish in the province of Biscay (Basque Country) was studied from 1993 to 2007 at more than 600 sampling locations. Results show that 108 streams were inhabited by the native crayfish species A. italicus while 137 streams were inhabited by non-native signal crayfish Pacifastacus leniusculus or red-swamp crayfish Procambarus clarkii. The spread of nonnative crayfish is not the only threat to the native species whose survival is also closely dependent on how watersheds are managed. Most A. italicus populations inhabit headwaters, where forestry activities are very important. The presence of native crayfish in heavily forested areas results in a conflict of interests and makes its conservation particularly difficult. We employed a SWOT analysis -an assessment and decision tool commonly used in marketing and business -to evaluate the situation of the native white-clawed crayfish in Biscay, a province characterized by very high demographic pressure. SWOT analysis has proved to be a useful diagnostic tool and can help develop better and more accurate management strategies for the conservation of native crayfish threatened by multiple stressors. RÉSUMÉLe futur de l'écrevisse à pattes blanches indigène Austropotamobius italicus dans les rivières du pays basque : Est-il possible de survivre en étant une espèce gênante ? Mots-clés :

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Section: Methodsmentioning

confidence: 96%

The future of the indigenous freshwater crayfishAustropotamobius italicusin Basque Country streams: Is it possible to survive being an inconvenient species?

Knowl. Managt. Aquatic Ecosyst.

Antón

2009

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“…A general description of basins in the Basque Country is recorded in DOCAMPO et al (1991). The Cadagua basin has two parts.…”

Section: Study Areamentioning

confidence: 99%

Relationships Between Changes in Habitat Conditions and Population Density of an Introduced Population of Signal Crayfish (Pacifastacus Leniusculus in a Fluvial System.

Bull. Fr. Pêche Piscic.

Antón

2001

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After the disappearance of the native crayfish in many rivers in Biscay, Basque Country, Spain, the signal crayfish Pacifastacus leniusculus was introduced in the main fluvial stretches and several breeding populations have established. One of the most productive zones was the Cadagua River, where the population was established from 1989 (first introduction) to 1995. Starting from that year, a marked decrease in population was recorded downstream, and this fact is studied in relation to fluctuations in physical and chemical conditions caused by human perturbations in the fluvial corridor mainly caused by the construction of a road.

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Differences in abiotic water conditions between fluvial reaches and crayfish fauna in some northern rivers of the Iberian Peninsula

Aquatic Living Resources

2002