Results 251 to 260 of about 84,328 (297)

Matings Systems and the Evolution of Niche Breadth

The American Naturalist, 1999
Several theoretical studies of niche breadth evolution have shown that niche breadth expansion can only occur under a limited set of conditions. These studies have assumed that mating pairs form at random within spatial subpopulations. I show here that nonrandom mating within spatial subpopulations can greatly alter niche breadth evolution.
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The Latitudinal Gradient in Niche Breadth: Concepts and Evidence

The American Naturalist, 2004
We examine Robert MacArthur's hypothesis that niche breadth is positively associated with latitude (the latitude-niche breadth hypothesis). This idea has been influential and long standing, yet no studies have evaluated its generality or the validity of its assumptions.
Diego P, Vázquez, Richard D, Stevens
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Niche Breadth, Resource Availability, and Inference

Ecology, 1982
Measures of niche breadth are discussed in relation to the distance between the resource use distribution and the resource availability distribution. Methods are developed for comparing breadth measures, testing a breadth measure equal to a given value, and for estimating confidence intervals.
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Using niche breadth theory to explain generalization in mutualisms

Ecology, 2018
AbstractFor a mutualism to remain evolutionarily stable, theory predicts that mutualists should limit their associations to high‐quality partners. However, most mutualists either simultaneously or sequentially associate with multiple partners that confer the same type of reward.
Rebecca T. Batstone, Kelly A. Carscadden, Michelle E. Afkhami, Megan E. Frederickson   +3 more
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Dominance, diversity, and niche breadth in arbuscular mycorrhizal fungal communities

Ecology, 2022
AbstractClassical theory identifies resource competition as the major structuring force of biotic communities and predicts that (i) levels of dominance and richness in communities are inversely related, (ii) narrow niches allow dense “packing” in niche space and thus promote diversity, and (iii) dominants are generalists with wide niches, such that ...
John Davison, Martti Vasar, Siim‐Kaarel Sepp, Jane Oja, Saleh Al‐Quraishy, C. Guillermo Bueno, Juan José Cantero, Ezequiel Chimbioputo Fabiano, Guillaume Decocq, Lauchlan Fraser, Inga Hiiesalu, Wael N. Hozzein, Kadri Koorem, Mari Moora, Ladislav Mucina, Vladimir Onipchenko, Maarja Öpik, Meelis Pärtel, Cherdchai Phosri, Marina Semchenko, Tanel Vahter, Leho Tedersoo, Martin Zobel   +22 more
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[Niche breadth of Gymnosporangium haraeanum].

Ying yong sheng tai xue bao = The journal of applied ecology, 2002
The resistant difference among different main pear cultivars in Anhui Province to pear rust caused by Gymnosporangium haraeanum was significant. According to disease index and diseased leaves of susceptible cultivars, the niche breadths of hosts were 0.7555 and 0.7951, respectively.
Y, Li, H, Cheng
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NICHE — Programs for Niche Breadth, Overlap and Hypervolumes

1991
The concept of niche involves two complementary aspects, one related to the hypervolume occupied by a species or a community in the ecological space (e.g. Hutchinson 1957, 1978; Feoli, Ganis and Woldu 1988) and the other related to the pattern of resources exploitation and competition (e.g.
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Likelihood Measures of Niche Breadth and Overlap

Ecology, 1979
Currently used niche measures of overlap and breadth are shown to be inappropriate for analyzing field data. Previously proposed measures assume resources are equally available, but this assumption is unwarranted in field studies. Comparisons of different measures of either breadth or overlap are also not valid. A measure of niche breadth is derived by
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Climatic‐niche breadth, niche position, and speciation in lizards and snakes

Journal of Biogeography
AbstractAimThe climatic niche is associated with diversification in many groups of animals and plants. However, the relationships between climatic‐niche breadth evolution, climatic‐niche position evolution, and speciation remain underexplored. It is particularly unclear whether changes in climatic‐niche breadth are related to diversification. We tested
Matthew Owen Moreira, John J. Wiens, Carlos Fonseca, Danny Rojas   +3 more
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Latitudinal gradient in niche breadth of brachyuran crabs

Global Ecology and Biogeography, 2015
AbstractAimNiche breadth has long been hypothesized to decrease at low latitudes and contribute to global patterns of species diversity. Range size, phylogenetic relatedness and body size also have hypothesized relationships with both latitude and niche breadth, which may further affect niche breadth patterns. Existing terrestrial data are inconclusive
Papacostas, Katherine J., Freestone, Amy L.   +1 more
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