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#ecosystem disruption

3 public questions tagged with this topic.

Controls Ecosystem

What happens when sea otters are removed from kelp forests?

“Sea urchins increase, kelp decreases” for what happens when sea otters are removed from kelp forests. This relationship follows from the ecological mechanism represented by the terms in the item, not merely from an association between their names. The relevant inference should follow the pathway from resource supply to organismal uptake and then to ecosystem-level flux. Productivity, trophic transfer, decomposition, and nutrient regeneration are connected, but each measures a different part of that pathway. The remaining alternatives—“Sea urchins decrease”, “Kelp biomass increases”, “No effec

Ref: Fundamentals of Ecology, Odum & Barrett, 5th Ed., Ch. 4

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Species Control

Species group whose removal triggers cascades:

“Keystone species” for species group whose removal triggers cascades. This relationship follows from the ecological mechanism represented by the terms in the item, not merely from an association between their names. Species management must identify the demographic stage and ecological process that most strongly limits population growth. Prevention, early detection, removal, habitat manipulation, and biological control act at different points in an invasion or recovery trajectory. The remaining alternatives—“Indicator species”, “Generalist species”, “Specialist species”—refer to different state

Ref: Ecology: From Individuals to Ecosystems, Begon et al., 5th Ed., Ch. 21

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Types of Species

Common impact of invasive species on native ecosystems?

“Decreased biodiversity” for common impact of invasive species on native ecosystems. This relationship follows from the ecological mechanism represented by the terms in the item, not merely from an association between their names. Effective control reduces propagule pressure or population growth without causing unacceptable non-target effects. Repeated monitoring is necessary because seed banks, dormant stages, recolonization, and density-dependent compensation can reverse short-term gains. The remaining alternatives—“Increased biodiversity”, “Stable ecological niches”, “Enhanced native popula

Ref: NCERT Biology Class 12, Ch. 15 Biodiversity and Conservation

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