Welcome to our book review site go-pdf.online!
You may have to Search all our reviewed books and magazines, click the sign up button below to create a free account.
Variation in the abundance of red-breasted mergansers Mergus serrator on a Scottish river in relation to season, year, river hydrography, salmon density and spring culling
Red-breasted Mergansers Mergus serrator were counted in the river North Esk, Scotland, and on the sea nearby, 1987-1990. Pairs arrived at the river estuary from early winter, but the main influx to freshwater took place in late April and in May, when breeding pairs dispersed far upriver. Females began incubation from late May. Most young hatched in July and fledged by late September. Males left the river in June and congregated at an offshore moulting site, their numbers peaking in August, and dispersed rapidly in September. Breeding density and total duckling production decreased with increasing distance upstream, decreasing river width and increasing gradient and elevation. The total numbe...
) mergansers
Reprint of Smithsonian Institution National Museum Bulletins 126 and 130. Part 1 covers merganser, ducks, teals, gadwall, widgeon, shoveler and others. Part 2 covers ducks, eiders, scoters, geese, swans and others.
Common Merganser
None
Common Merganser
None
