William Rowan

LIGHT AND SEASONAL REPRODUCTION IN ANIMALS

Some fifty species of animals have provided the material for the investigations reviewed. The majority have been birds, but mammals, reptiles, amphibia, fish and invertebrates have also been used. A list is provided.

Ecological Note on the Birds Observed at the Biological Station of the University of Manitoba

It is seldom that one has the opportunity of studying a number of welldefined habitats of birds in a small circle of two miles diameter, and of determining how far these habitats overlap and to what extent they are correlated and interchangeable. This opportunity arose so admirably in June and July of I920 at the new Biological Station of the Manitoba University at Indian Bay, Shoal Lake, Lake of the Woods, Manitoba, that I am tempted herewith to outline the main characteristics that future students may investigate them further. The Biological Station is situated at Waugh (Indian Bay), the terminus of the Greater Winnipeg Water District Railway. For the last two years Winnipeg has received its entire water supply from Shoal Lake. Since the present railway service leaves much to be desired, and is but little patronized by holiday makers, Indian Bay still enjoys its pristine wildness. Despite the efforts of the Indian School on Snowshoe Bay, the Indians are much the same as they have always been. There is a small permanent population of white men in connection with the water works and railway, but they are busy men and have disturbed the wild life of the place but little. This year the Biological Station has therefore offered a unique chance of studying the natural bird life of the district. Only a single artificial factor had to be considered-the large gravel pit which supplied the materials for the dyke built across Falcon Bay. Future students will be able to note the changes that are bound to occur in the avifauna of the place as the railway service improves, and brings with it the inevitable campers, and perhaps even enterprising agriculturists. The buildings of the Biological Station are situated on the edge of Indian Bav. Within a mile can be studied at least seven well-defined faunal habitats. These are: