Open Access
Table 3
Qualitative assessment of the risk of threats. Impact − Very High, High, Medium, Low, Unknown. Scope (the expected proportion of population of a species which has been affected by the factor) − Pervasive (71–100%), Large (31–70%), Restricted (11–30%), Small (1–10%), Negligible (<1%), Unknown.
| Threats | U. crassus | U. pictorum | U. tumidus | A. anatina | A. cygnea | P. complanata | ||||||
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| Impact | Scope | Impact | Scope | Impact | Scope | Impact | Scope | Impact | Scope | Impact | Scope | |
| (a) Pollution and eutrophication | ||||||||||||
| Agriculture effluents | Very High | Pervasive | Medium | Pervasive | High | Pervasive | Medium | Pervasive | Medium | Pervasive | High | Pervasive |
| Household and urban waste water, industry effluents | Very High | Pervasive | Medium | Pervasive | High | Pervasive | Medium | Large | Medium | Pervasive | High | Pervasive |
| (b) Habitat loss, degradation and changes of habitats | ||||||||||||
| Regulation of watercourses | High | Large | Medium | Large | High | Large | Medium | Large | Medium | Large | Medium | Large |
| Dams | High | Restricted | Medium | Restricted | Very High | Restricted | Medium | Restricted | Low | Restricted | High | Restricted |
| (c) Water abstraction and climate change | ||||||||||||
| Manipulation of water level | High | Restricted | High | Restricted | High | Restricted | High | Large | Very High | Large | Medium | Restricted |
| Drought | Medium | Large | Medium | Large | Medium | Large | Medium | Large | Medium | Large | Medium | Large |
| (d) Invasive species | ||||||||||||
| molluscs | Low | Small | Low | Restricted | Medium | Restricted | Medium | Restricted | Medium | Restricted | Low | Restricted |
| others | Medium | Restricted | Medium | Restricted | Medium | Restricted | Medium | Restricted | Medium | Restricted | Medium | Restricted |
| (e) Loss of fish hosts | Medium | Large | Unknown | Unknown | Unknown | Unknown | Medium | Restricted | Unknown | Unknown | Unknown | Unknown |
| (f) Overexploitation | Low | Negligible | Low | Negligible | Low | Negligible | Low | Negligible | Low | Negligible | Low | Negligible |
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