. The Canadian field-naturalist. YER\ RIVER. Figure 3. Range map for the Giant Stickleback which is found only in Mayer Lake, Queen Charlotte Islands. beaches during the spawning season. High water for- ces the fish to nest at depths where the exposure to trout is increased. Drops in water level during the breeding season can expose eggs to excessively high temperatures and cause the male to abandon the nest. Fluctuations in water level are becoming more com- mon in the Queen Charlotte Islands as the Beaver (Castor canadensis), introduced after World War II, expands its range. Limiting Factors
. The Canadian field-naturalist. YER\ RIVER. Figure 3. Range map for the Giant Stickleback which is found only in Mayer Lake, Queen Charlotte Islands. beaches during the spawning season. High water for- ces the fish to nest at depths where the exposure to trout is increased. Drops in water level during the breeding season can expose eggs to excessively high temperatures and cause the male to abandon the nest. Fluctuations in water level are becoming more com- mon in the Queen Charlotte Islands as the Beaver (Castor canadensis), introduced after World War II, expands its range. Limiting Factors The population appears to be stable. Numbers may be regulated by the availability of spawning sites and by predation. Fluctuating water levels resulting from. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Ottawa Field-Naturalists' Club. Ottawa, Ottawa Field-Naturalists' Club
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