Main cause of catastrophic decline in water vole population in Britain.

Transcription

1

2 Main cause of catastrophic decline in water vole population in Britain. John McAvoy American mink Mustela vison

3 Chokes waterways, impacting upon fish, plants and invertebrates. Floating Water Pennywort Hydrocotole ranuculoides

4 Reduces light beneath water surface, killing native plants and causing de-oxygenation. Water Fern Azolla filiculoides

5 Rhododendron ponticum in Snowdonia. Taking over native ecosystems. Mike McCabe

6 Can achieve high densities and dominate waterways in which they become established. Matt Brazier Topmouth Gudgeon Pseudorasbora parva

7 Environment Agency Rotenone piscicide application. Matt Brazier

8 Invasive moss from the southern hemisphere, now carpeting areas of British moors and heaths. Heath Star Moss Campylopus introflexus

9 Fast growing, reduces light availability & increases sedimentation rates. Clogs harbours & beaches. Chris Wood Japweed Sargassum muticum

10 Oxford Botanic Gardens escapee (late 18 th century). Spread via railway lines across Britain. Oxford Ragwort Senecio squalidus

11 Causes erosion of river banks, impacting upon flood defences. Fera Chinese Mitten Crab Eriocheir sinensis

12 An invasive shrub of heath and woodland, originally used for game cover. Shallon Gaultheria shallon

13 An invasive shrub of heath and woodland, originally used for game cover. Shallon Gaultheria shallon

14 Rapid spread since introduction in 1970 s. Carrier of crayfish plague which kills infected native crayfish. Signal Crayfish Pacifastacus leniusculus

15 Widely naturalised on waste ground and railway embankments, especially in the south-east. Goat s Rue Galega officinalis

16 Forms dense mats, out-competing native species, and choking ponds and drainage ditches. Australian Swamp Stonecrop Crassula helmsii

17 Forms dense mats, out-competing native species, and choking ponds and drainage ditches. Australian Swamp Stonecrop Crassula helmsii

18 Widely spread throughout road and rail embankments. Michaelmas Daisy Aster novi-belgii

19 Huge cost for railway industry, and damages historic buildings. Butterfly Bush Buddleia davidii

20 Preys on native invertebrates, causing declines in our native ladybirds.. Mike Majerus Harlequin Ladybird Harmonia axyridis

21 Invasive in native woodlands Himalayan Honeysuckle Leycesteria formosa

22 Forms large thickets causing damage to natural habitat, and out-competing native species. Japanese Rose Rosa rugosa

23 A garden escape that has spread rapidly along roadside verges and woodland throughout Britain. Trevor Renals Montbretia Crocosmia crocosmifolia

24 A garden escape that has spread rapidly along roadside verges and woodland throughout Britain. Montbretia Crocosmia crocosmifolia

25 A vector for the chytrid fungus, implicated in serious amphibian population declines. African Clawed Frog Xenopus laevis

26 Can reach densities of up to 1,700 per m, a pest on commercial oyster beds. Slipper Limpet Crepidula fornicata

27 Long-lived species, basks on nests of waterfowl causing desertion. Carries Salmonella. Red-eared Terrapin Trachemys scripta

28 Escape from captivity has resulted in well-established populations in mainland Europe. Niall Moore Raccoon Procyon lotor

29 Form reefs of razor sharp shells, impacting upon native species and making beaches inaccessible to the public. Pacific Oyster Crassostrea gigas

30 An agricultural pest, causes huge problems in U.S. by causing power black-outs.. Monk Parakeet Myiopsitta monachus

31 Competes for nesting sites with native hole-nesting bird species (e.g. nuthatch). Ring-necked Parakeet Psittacula krameri

32 Germinates earlier and faster than native species, forming tall dense stands, causing a reduction in biodiversity. Himalayan Balsam Impatiens glandulifera

33 A common escapee from garden ponds, spreading by growth from small stem fragments. Parrot s Feather Myriophyllum aquaticum

34 Highly invasive; can cover large areas rapidly (e.g. 500ha. in 5 years in one area of France). Trevor Renals Water Primrose Ludwigia peploides

35 Highly invasive; can cover large areas rapidly (e.g. 500ha. in 5 years in one area of France). Water Primrose Ludwigia peploides

36 Highly invasive; can cover large areas rapidly (e.g. 500ha. in 5 years in one area of France). Water Primrose Ludwigia peploides

37