GEOG 3110 Lecture Notes - Lecture 18: Jack Pine, Environmental Factor, Dune
17 Feb 2016
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Document Summary
Jack pine will not germinate under its own canopy. It requires fire to germinate; the glue melts and releases its seeds. Disturbances have been so frequent and so generally effective that the expected climaxes or. White (1979): disturbances not all catastrophic, disturbances don"t always originate in the physical environment. Exogenously (from outside the community) ex. hurricane, volcanic eruption. Endogenously (from within the community) ex. insect outbreaks, fungal pathogens. Interactively (a synergy between exogenous and endogenous factors). Disturbance is an integral environmental factor for population, community and ecosystem dynamics. ie. ecosystems are characterized by their climate, soil type, topographic location, and disturbance regime. Jack pine occurs in the boreal forest occurs because of wild fires. Seasonality when during the year does the event occur, are species dormant or biologically active. Disturbance: any relatively discrete event in time that disrupts ecosystem, community or population structure and changes resources, substrate availability, or the physical environment .
