B.F. Bachelor of Forestry Bachelor of Forestry Forest Ecosystem 5 — Questions and Answers
Question 1: Metapopulation theory is most applicable to forest wildlife species that:
- Occupy continuous old-growth habitat exclusively
- Exist as spatially separated subpopulations connected by dispersal (Correct answer)
- Migrate seasonally between forest and grassland biomes
- Are apex predators with very large home ranges
Correct answer: Exist as spatially separated subpopulations connected by dispersal
Metapopulation dynamics describe subpopulations in fragmented habitat patches linked by occasional dispersal events.
Question 2: Which process is responsible for the characteristic yellow and orange leaf colors in deciduous forests during autumn?
- New pigment synthesis triggered by cold temperatures
- Unmasking of carotenoids as chlorophyll breaks down (Correct answer)
- Anthocyanin production from stored sugars
- Tannin oxidation in response to photoperiod
Correct answer: Unmasking of carotenoids as chlorophyll breaks down
Yellow and orange carotenoid pigments are present all season but become visible as green chlorophyll degrades in fall.
Question 3: In forest succession, a climax community is best defined as:
- The most species-rich stage of succession
- A self-perpetuating community in equilibrium with site conditions (Correct answer)
- The first community to colonize disturbed ground
- A community dominated by fire-adapted species
Correct answer: A self-perpetuating community in equilibrium with site conditions
A climax community maintains itself through reproduction without further directional change under stable environmental conditions.
Question 4: Which type of mutualism is exemplified by the relationship between alder trees (Alnus spp.) and Frankia bacteria?
- Mycorrhizal association
- Symbiotic nitrogen fixation (Correct answer)
- Lichenic photosynthesis
- Ectomycorrhizal carbon transfer
Correct answer: Symbiotic nitrogen fixation
Frankia actinomycetes fix atmospheric nitrogen in alder root nodules, enriching soil nitrogen for surrounding plants.
Question 5: The concept of 'ecosystem services' categorizes benefits forests provide. Which is an example of a regulating service?
- Timber production
- Recreation and tourism
- Carbon sequestration and climate regulation (Correct answer)
- Spiritual and cultural values
Correct answer: Carbon sequestration and climate regulation
Regulating services include carbon sequestration, water purification, and flood control — processes that regulate environmental conditions.
Question 6: A forester assessing old-growth characteristics would look for which structural feature as a key old-growth indicator?
- Even-aged canopy with uniform diameter distribution
- Abundant coarse woody debris and multi-layered canopy (Correct answer)
- High density of advance regeneration only
- Absence of snags due to complete decomposition
Correct answer: Abundant coarse woody debris and multi-layered canopy
Old-growth forests are defined by structural complexity including large snags, CWD, pit-and-mound topography, and multi-aged canopies.
Question 7: Which disturbance regime characteristic best explains why the boreal forest has a relatively simple species composition compared to tropical forests?
- High frequency of stand-replacing fires and harsh climate limiting species establishment (Correct answer)
- Absence of mammalian herbivores reducing selective pressure
- Very high precipitation leaching soil nutrients rapidly
- Stable climate over millennia with no glacial disturbance
Correct answer: High frequency of stand-replacing fires and harsh climate limiting species establishment
Frequent severe fires combined with cold climate and short growing seasons limit the number of species adapted to boreal conditions.
B.F. Bachelor of Forestry Bachelor of Forestry Forest Ecosystem 5
Metapopulation theory is most applicable to forest wildlife species that: