Ponds, Pools and Lochans

3.4 Collecting plant or invertebrate data to assess pond conservation value


To place ponds in the categories shown in Table 8, plant and invertebrate surveys should use the standard National Pond Survey methods. For plants, the standard NPS method consists of making a list of wetland plant species present based on the wetland plant recording list used for the National Pond Survey. This list is available from Pond Action in the guide to the methods of the National Pond Survey (Pond Action, 1998). A skilled botanist assessing a typical 1000 m2 waterbody should take 1 to 2 hrs. Sites of 1 ha or more may take up to one day to survey.

To assess the conservation value of invertebrate assemblages a standard three minute hand-net sample should be collected, also following National Pond Survey methods. A description of the method is given in the guide to the methods of the National Pond Survey (Pond Action, 1998). For an experienced invertebrate biologist a standard three minute sample (which refers to three minutes net-in-the-water time) may take about one hour to collect, 8-12 hours to sort in the laboratory and 8-12 hours to identify at species level.

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