Biological Studies of the English Lakes

abundant algae Ancylus fluviatilis animals Asellus Asterionella bacteria Bassenthwaite Blelham bottom Buttermere calcium Carex Cladocera collections communities concentration Coniston core Crummock Crummock Water deep water depth Derwentwater diatoms distribution drainage area dry weight Ecol English Lake District Ennerdale Ephemeroptera epilimnion Esthwaite Water fauna fish flatworms flocculosa fluviatilis fossarum Freshwater Biological Association Gammarus growth Haweswater hypolimnion increase inflow Isoetes June Lake District Lake District lakes Limnaea Limnol Linn Littorella Loweswater Lund Macan Mackereth Melosira metres Mortimer Nitella North Basin occur organic matter oxygen Pearsall Pennington perch period phosphate Phragmites Physa fontinalis phytoplankton plankton Planorbis plants population Potamogeton productive lakes rainfall recorded reed-beds samples sediments sewage shallow water silt soil species stations stony substratum summer surface Tabellaria Tarn temperature thermocline Thirlmere trout tube Ullswater unproductive vegetation Wastwater Windermere Windermere South winter Wray year-class zone