Survey
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Box 3.1: Guidance for timings of survey work. Based in part on information contained within Working With Wildlife. Compliance and beyond in construction. CIRIA. 2004. Shading indicates when survey may be carried out. This information is provided for guidance only. Actual survey timings will depend on site circumstances as well as current and historical environmental conditions, and advice should always be sought from a professional ecologist. Jan Feb Mar Apr Habitats Phase 1 Habitat Survey Nat. Veg. Classification Woodland Acid grassland Neutral grassland Chalk grassland Heathland Fresh water Species Vascular plants Fungi Mosses and liverworts Lichens Birds Badgers Bats (hib = hibernation) Dormice Otters Water voles Reptiles Great crested newts and other amphibian species Fish White-clawed crayfish Aquatic invertebrates Terrestrial invertebrates May Jun Jul Aug Sep Oct Nov Dec Optimum survey period normally May – July. See below for optimum time period for the specific habitats Optimum survey period. Optimum survey period Optimum survey period Optimum survey period June – July Optimum survey period Optimum survey period Optimum survey period normally May – July, but repeat visits usually required Optimum time for surveys unless dry Survey work may be undertaken throughout the year, but only in dry weather Breeding birds. Wintering birds. Grazing marsh/intertidal waterfowl (wintering/passage birds) Optimum time spring and early autumn / winter. Maternity roosts Tree roosts Activity surveys Hib roosts Nest searches All search methods Nut and nest searches Dense vegetation growth may constrain surveys Optimum time March – June. Dense vegetation growth may constrain surveys Optimum time is April and May Optimum time Sept Pond and terrestrial habitat surveys Larvae and terrestrial Terrestrial habitat habitat surveys surveys Timing depends on type of waterbody and species concerned Wintering birds Grazing marsh/intertidal waterfowl (wintering/passage birds) Tree roosts Hibernation roosts Nut searches Repeat visit in Sept Requires several visits spread throughout the survey season