BS 15110:2006 pdf download – Water quality — Guidance standard for the sampling of zooplankton from standing waters

BS 15110-2006 pdf download – Water quality — Guidance standard for the sampling of zooplankton from standing waters 5.1.2Other field equipment Winch with line-length counter or line with length markings fitted with a shackle or similar device to enable theline to be joined to the net. Draining cup with nylon netting, which is capable of being attached to the net either by means of a tighteningstrip or tape sewn into the net. The netting of the draining cup should have the same mesh size as the net.Adraining cup with hose and hose clamp can also be utilised. Weight, e.g. a standard sounding lead weight. Spray bottle with water for rinsing out the net and draining cup. A small plastic funnel may be needed to transfer the sampled material to the sample bottle. 5.1.3 Optional equipment Portable echo sounder or depth meter to estimate the water depth at a sampling site.The former may also beused to quantify large zooplankton species. Global Positioning System (GPS) to define site location.5.2Quantitative sampling 5.2.1Sampling equipment For this purpose various types of volume samplers (bottles/traps/tubes) can be used (e.g.Schindler-Patalastrap or modified Ramberg sampler) (Figure 1b and 1c). Plankton nets with a closure mechanism and built-inwater flow-through meter (e.g.Clarke-Bumpus sampler)(Figure 1d), plankton pumps (e.g.[10] or [14]) andflexible tubes (e.g. [9],[11]) can be used for obtaining vertically or horizontally integrated quantitativezooplankton samples. Echo sounder records can be used in the field to quantify large zooplankton species(e.g.Chaoborus).Several of the most widely used quantitative zooplankton samplers have been described indetail by [2] and [3]. Where volume samplers are concerned, a sampler should be chosen that allows a free flow of water when thesampler is not closed. lt should also be possible to close the sampler rapidly, and the sampler should be astransparent as possible (plexiglas walls) in order to prevent avoidance by large plankton species with goodvision and mobility.For the same reason, it is advantageous to use a sampler that is not too small (minimum5 l). In locations with large populations of algae(nutrient-rich lakes), however, it may be advantageous to usea smaller model of volume sampler (e.g. a tube sampler of 3 l).Such samplers may also be suitable for use inlakes in locations that require equipment to be carried over long distances. Motorised plankton pumps with continuous flow-through are recommended rather than hand-poweredplankton pumps, because motorised pumps provide a regular flow, thus providing better estimates of thequantity and composition of...