County Wildife Site Criteria for Cornwall Appendices

DRAGONFLIES AND DAMSELFLIES (ODONATA)There should be a presumption for selecting Odonata sites where they support thefollowing species:Cornwall BAP Priority speciesA site is eligible for selection if it supports a significant population of the Southern Damselfly(Coenagrion mercuriale).Species listed on Schedule 5 of the Wildlife & Countryside Act 1981 (asamended)A site is eligible for selection if it supports a significant population of a listed species.Species listed on Annex II of the EC Habitats Directive (1992, as amended)A site is eligible for selection if it supports a significant population of a listed species.Red Data Book (RDB) SpeciesA site is eligible for selection if it supports a significant population of a RDB species (seeShirt, 1987 and Daguet et al., 2008).Nationally Scarce SpeciesAny site that contains a colony of these species is eligible to be considered of countyimportance. The status of the species in the county and the size of the colony are factors tobe considered together. A site qualifies for selection if it contains a Nationally Scarce speciesthat is:- a strong population of the species- a population that has been established for more than 20 years- a population outside its normal range.The exact meaning of the terms ‘strong’ and ‘normal range’ need to be established for eachspecies on a site by site basis and the reasons for each judgement included in the siteevaluation.Ischnura pumilio and Ceriagrion tenellumThe largest colonies will certainly be of county importance, but a review of its status(distribution and population) will be required before detailed assessments can be made.Sympetrum sanguineumAny site of this migratory species that is shown to hold a self-sustaining breeding populationwill be of county importance.Species of county importanceA further three species known or presumed to occur in 101-150 10 km squares in GreatBritain are thought to be so nationally uncommon that any site that holds them should beconsidered for CWS status. These species are listed below:Aeshna mixtaOrthetrum coerulescensOrthetrum cancellatumPlatycnemis pennipesA site qualifies for selection if it contains a species of county importance that is:- a strong population of the species that is known to be long established; or- a strong population outside its normal range.Appendix 6 – Species Evaluation in CornwallCounty Wildlife Sites Criteria