BIOL 2903 Lecture Notes - Lecture 4: Hudson Bay Lowlands, Blackpoll Warbler, Muskeg
8 Oct 2018
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Biol (cid:1006)90(cid:1007) lecture (cid:1008: hudson bay is the breeding range southern limit for a lot of northern shorebirds, southern limits of range goes no further south, northern limits of range goes no further north, ex. Hudsonian godwit breeds along hudson bay coast but winters in south america, travelling a large distance. Saxifrages: adaptations for the cold environment, 1. Cold hardiness (plant equivalence of freeze tolerance: some trees tolerate -80oc, 2. Small size: dwarf birch, arctic willow, and labrador willow exhibit dwarfism. Two types: genotypic dwarfism fixed genetically how big it will grow no matter how much growing conditions improve, ex. Dwarf labrador tea grows no large if planted farther south: phenotypic dwarfism if growing conditions are better, it will grow taller, ex. Dwarf birches grow larger farther south: 3. Low, creeping, sprawling growth: can have many leaves but are spread down low to the ground, not growing high, ex. Crowberry is a subarctic plant that exhibits sprawling growth: 4.
