One More Table for 2019

These are top of the list for plants not re-found in entire hectads (10 km squares) of Vc104 since before 2000:

Taxon Vernacular

# Hectads where not re-found

Carex pauciflora Few-flowered Sedge

11

Coeloglossum viride Frog Orchid

9

Lycopodium clavatum Stag’s-horn Clubmoss

9

Pseudorchis albida Small-white Orchid

9

Sparganium natans Least Bur-reed

8

Carex limosa Bog-sedge

7

Hammarbya paludosa Bog Orchid

7

Melampyrum pratense Common Cow-wheat

7

Potamogeton alpinus Red Pondweed

7

Catabrosa aquatica Whorl-grass

6

Draba incana Hoary Whitlowgrass

6

Hippuris vulgaris Mare’s-tail

6

Hymenophyllum tunbrigense Tunbridge Filmy-fern

6

Orobanche alba Thyme Broomrape

6

Potamogeton berchtoldii Small Pondweed

6

Prunus padus Bird Cherry

6

Utricularia vulgaris sens. lat. Greater Bladderwort

6

Vicia sylvatica Wood Vetch

6

Vulpia bromoides Squirreltail Fescue

6

Some of these come as a bit of a surprise and may influence my choice of survey areas this season. Some were apparently widespread in some areas in the past e.g. five tetrads in NG33 for Pseudorchis albida. Some of these may represent genuine decline.

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2 Responses to “One More Table for 2019”

  1. Terry Swainbank Says:

    Very interesting. You will not be surprised that I was drawn to the numbers for frog orchid. Presumably the habitats at a superficial level have not changed – wholesale pesticide use, house building are unlikely on Skye. The distribution is unlikely to be affected by climate change. But it does not seem to cope with plant competition (in the south it is only found on short turf) so maybe there are subtle differences perhaps in nitrogen levels increasing competition or some impact on root mycorhiza.

  2. Stephen Says:

    Yes, frog and small-white orchids are two species that I think may have genuinely declined. Frogs on rocks/cliffs seem OK but those in short turf not so much. There again, both these species are easily overlooked.and small-white in particular isn’t in flower and therefore easily spotted for long. Also some short turf frogs are very dwarfed. Just thinking out loud…….

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