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What adaptations does the coyote brush possess that help it survive in the chaparral biome? (Site 1)
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Coyote brush (Baccharis pilularis) has several key adaptations that let it survive and thrive in the hot, dry, fire-prone chaparral:
- Water-conserving leaves: small, leathery (sclerophyllous) leaves with a thick waxy cuticle and often hairs — reduce water loss by limiting transpiration and reflecting sunlight.
- Deep and extensive roots: tap and lateral roots access deep soil moisture and stabilize the plant during drought.
- Drought tolerance / conservative physiology: can close stomata and slow growth during summer droughts to conserve water.
- Fire resilience: many individuals resprout from the root crown or roots after fire, allowing rapid recovery.
- Effective dispersal and colonization: produces large numbers of wind-dispersed seeds (pappus), so it can quickly recolonize burned or disturbed areas.
- Chemical defenses and tough tissues: secondary compounds and tough woody stems deter herbivores and reduce tissue damage from heat/UV.
- Flexible life history: fast establishment and competitive shading of openings helps it dominate disturbed chaparral patches.
Together these traits match the chaparral’s challenges: summer drought, poor soils, intense sun, and frequent fire.
- Water-conserving leaves: small, leathery (sclerophyllous) leaves with a thick waxy cuticle and often hairs — reduce water loss by limiting transpiration and reflecting sunlight.
- Deep and extensive roots: tap and lateral roots access deep soil moisture and stabilize the plant during drought.
- Drought tolerance / conservative physiology: can close stomata and slow growth during summer droughts to conserve water.
- Fire resilience: many individuals resprout from the root crown or roots after fire, allowing rapid recovery.
- Effective dispersal and colonization: produces large numbers of wind-dispersed seeds (pappus), so it can quickly recolonize burned or disturbed areas.
- Chemical defenses and tough tissues: secondary compounds and tough woody stems deter herbivores and reduce tissue damage from heat/UV.
- Flexible life history: fast establishment and competitive shading of openings helps it dominate disturbed chaparral patches.
Together these traits match the chaparral’s challenges: summer drought, poor soils, intense sun, and frequent fire.
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