Results 21 to 30 of about 190,405 (306)

A spatially explicit model for competition among specialists and generalists in a heterogeneous environment [PDF]

open access: yes, 2006
Competition is a major force in structuring ecological communities. The strength of competition can be measured using the concept of a niche. A niche comprises the set of requirements of an organism in terms of habitat, environment and functional role ...
Lanchier, N., Neuhauser, C.
core   +1 more source

Niche Overlap and Diffuse Competition [PDF]

open access: yesProceedings of the National Academy of Sciences, 1974
Current theory predicts a distinct upper limit on the permissible degree of niche overlap; moreover, theory suggests that maximal tolerable overlap should be relatively insensitive to environmental variability. Data presented here demonstrate that, within the lizard subset of natural desert communities, niche overlap decreases both with increasing ...
openaire   +2 more sources

Structural Network Properties of Niche-Overlap Graphs [PDF]

open access: yes2013 International Conference on Signal-Image Technology & Internet-Based Systems, 2013
The structure of networks has always been interesting for researchers. Investigating their unique architecture allows to capture insights and to understand the function and evolution of these complex systems. Ecological networks such as food-webs and niche-overlap graphs are considered as complex systems. The main purpose of this work is to compare the
Sokhn Nayla   +4 more
openaire   +1 more source

Grassland degradation induces high dietary niche overlap between two common livestock: cattle and sheep

open access: yesJournal of Sustainable Agriculture and Environment, 2023
Introduction Diet selection of grazing livestock is one of the critical factors affecting the diversity and composition of plant communities in grasslands, with consequent impacts for ecosystem functioning.
Man Xu   +7 more
doaj   +1 more source

Population Dynamics on Complex Food Webs [PDF]

open access: yes, 2011
In this work we analyse the topological and dynamical properties of a simple model of complex food webs, namely the niche model. In order to underline competition among species, we introduce "prey" and "predators" weighted overlap graphs derived from the
Barabási A.-L.   +5 more
core   +2 more sources

Genotype-environment associations support a mosaic hybrid zone between two tidal marsh birds [PDF]

open access: yes, 2015
Local environmental features can shape hybrid zone dynamics when hybrids are bounded by ecotones or when patchily distributed habitat types lead to a corresponding mosaic of genotypes.
Kovach, Adrienne I.   +4 more
core   +3 more sources

Peri‐urban systems alter trophic niche size and overlap in sympatric coastal bird species

open access: yesEcosphere, 2023
Urban habitats can create empty trophic niche space by providing abundant alternative dietary resources, allowing some generalist species to either shift or expand their trophic niches.
Kimberly A. Lato   +3 more
doaj   +1 more source

Spatio-Temporal Niches of Main Fish Species in the Mangrove Creeks of the Nanliujiang River Estuary

open access: yesRedai dili, 2023
Mangroves are one of the most important wetland ecosystems. The development of fisheries in tropical and subtropical bays or estuaries is closely associated with mangroves since the high heterogeneity of the mangrove ecosystem provides a suitable habitat
Cheng Yanan   +8 more
doaj   +1 more source

Ecology and co-existence of two endemic day gecko (Phelsuma) species in Seychelles native palm forest [PDF]

open access: yes, 2011
In island ecosystems, reptiles play diverse ecological roles as a result of niche broadening, which increases potential niche overlap between species. Ecological niche partitioning is a means of reducing direct competition between coexisting species and ...
Bassett   +30 more
core   +1 more source

Ekologi Media Radio Siaran di Yogyakarta: Kajian Teori Niche terhadap Program Acara Radio Siaran di Propinsi Daerah Istimewa Yogyakarta

open access: yesJurnal Ilmu Komunikasi, 2013
: This article describes the radio competition in Yogyakarta at 2005. The radio competition was measured by using niche theory and as an unit of analysis is radio program. Niche theory was applied by measuring niche breadth and niche overlap.
F. Anita Herawati, Setio Budi HH
doaj   +1 more source

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