19 public questions tagged with this topic.
Stratification refers to the vertical arrangement of different species in an ecosystem, such as trees at the top, shrubs in the middle, and herbs at the bottom.
Ref: NCERT Class 12 Biology Chapter 12: Ecosystem Ecosystem - Structure Components Stratification
Species distribution is determined by abiotic (temperature, water) and biotic (predation, competition) factors.
Ref: NCERT Class 12 Biology Chapter 11: Organisms and Populations Organism and Environment - Major Biomes Abiotic Factors
“Distribution patterns of species” for island biogeography primarily studies. This relationship follows from the ecological mechanism represented by the terms in the item, not merely from an association between their names. Island biogeography explains species richness as a dynamic balance between immigration and extinction. Immigration generally declines as an island fills with species, whereas extinction rises as more species divide finite area and maintain smaller populations. The remaining alternatives—“Evolution of species”, “Genetic diversity”, “Marine ecosystems”—refer to different stat
Ref: Biogeography, Lomolino et al., 5th Ed., Ch. 5-8
“Robert MacArthur & E.O. Wilson” for who developed the island biogeography theory. This relationship follows from the ecological mechanism represented by the terms in the item, not merely from an association between their names. At equilibrium, species identities can continue to turn over even when richness is approximately stable. The model predicts a balance of rates, not an absence of colonization or extinction. The remaining alternatives—“Charles Darwin”, “Alfred Russel Wallace”, “Thomas M. Smith”—refer to different states, processes, or scales and therefore do not express the same causal
Ref: Biogeography, Lomolino et al., 5th Ed., Ch. 5-8
“Entry of new species” for immigration rate in island biogeography means. This relationship follows from the ecological mechanism represented by the terms in the item, not merely from an association between their names. At equilibrium, species identities can continue to turn over even when richness is approximately stable. The model predicts a balance of rates, not an absence of colonization or extinction. The remaining alternatives—“Exit of species”, “Death rate of species”, “Reproduction rate”—refer to different states, processes, or scales and therefore do not express the same causal relati
Ref: Biogeography, Lomolino et al., 5th Ed., Ch. 1-4
“Distribution patterns of species” for biogeography is primarily the study of. This relationship follows from the ecological mechanism represented by the terms in the item, not merely from an association between their names. Larger islands usually support more habitats and larger populations, lowering extinction risk; less isolated islands receive colonists more readily and may experience rescue effects. These mechanisms also apply to habitat fragments that function as ecological islands. The remaining alternatives—“Species genetics”, “Marine biology”, “Animal behavior”—refer to different stat
Ref: Biogeography, Lomolino et al., 5th Ed., Ch. 1-4
“Interspecific competition with Balanus” for chthamalus barnacles occupy their realized niche due to. This relationship follows from the ecological mechanism represented by the terms in the item, not merely from an association between their names. Niche differentiation reduces overlap by separating species along resource, space, or time axes. Such partitioning can stabilize coexistence when each species performs relatively better under the conditions it uses most strongly. The remaining alternatives—“Lack of predators”, “Climate change”, “Low reproductive rate”—refer to different states, proce
Ref: Ecology: Concepts and Applications, Molles, 9th Ed., Ch. 13
“Decreased population size” for emigration generally results in. This relationship follows from the ecological mechanism represented by the terms in the item, not merely from an association between their names. Interpretation must distinguish absolute population change from a per-capita rate and must state the time interval and population boundary. Age structure, dispersal, environmental variation, and delayed responses can all make observed trajectories depart from a simple model. The remaining alternatives—“Increased population size”, “No change in population size”, “Increased genetic divers
Ref: Campbell Biology, Urry et al., 12th Ed., Unit 8 Ecology
“Random dispersion” for dispersion of individuals due to lack of interaction results in. This relationship follows from the ecological mechanism represented by the terms in the item, not merely from an association between their names. Population ecology links individual births, deaths, immigration, and emigration to changes in abundance. Per-capita rates determine the direction of change, while density dependence creates feedback when crowding alters survival or reproduction. The remaining alternatives—“Clumped dispersion”, “Uniform dispersion”, “Clustered dispersion”—refer to different states
Ref: Campbell Biology, Urry et al., 12th Ed., Unit 8 Ecology
“Reduced niche breadth” for ecological compression leads primarily to. This relationship follows from the ecological mechanism represented by the terms in the item, not merely from an association between their names. Population ecology links individual births, deaths, immigration, and emigration to changes in abundance. Per-capita rates determine the direction of change, while density dependence creates feedback when crowding alters survival or reproduction. The remaining alternatives—“Expanded fundamental niche”, “Increased realized niche”, “Uniform dispersion”—refer to different states, proc
Ref: Campbell Biology, Urry et al., 12th Ed., Unit 8 Ecology
Ecological compression is a short-term narrowing of resource use or habitat occupancy caused by the presence of competitors. Individuals shift behavior, foraging locations, or utilized resources within their existing phenotypic capacity, so the realized niche becomes narrower. The fundamental niche—the conditions under which the species could persist without the competitor—does not expand or contract merely because current competition changes. Compression can be reversed quickly if the competitor is removed, distinguishing it from character displacement, which involves heritable evolutionary d
Ref: Ecology: Concepts and Applications, Molles, 9th Ed., Ch. 13
A fundamental niche comprises the abiotic conditions and resources under which a species could maintain a population in the absence of restrictive biotic interactions. A realized niche is the portion actually occupied when competitors, consumers, pathogens, mutualists, and dispersal constraints operate. Competition commonly excludes a species from otherwise physiologically suitable environments, making the realized niche narrower than the fundamental niche. Connell’s barnacle experiments illustrate this: removing a dominant competitor allowed the subordinate species to occupy a broader interti
Ref: Ecology: Concepts and Applications, Molles, 9th Ed., Ch. 13
