Consulta: subjectFacets:"Niche theory"
Registros recuperados: 5
Data/hora: 02/06/2024 16:32:30

On sustainability of human ecological  niche construction
Provedor de dados: 7
Tipo: Peer-Reviewed Response
Palavras-chave: Agriculture; Human health; Niche theory.
Ano: 2014

Sustainability of Human Ecological Niche Construction
Provedor de dados: 7
Autores: Isbell, Forest; Department of Ecology, Evolution &amp; Behavior, University of Minnesota Twin Cities, Saint Paul, Minnesota; forest.isbell@gmail.com; Loreau, Michel; Centre for Biodiversity Theory and Modelling, Experimental Ecology Station, Centre National de la Recherche Scientifique, Moulis, France; michel.loreau@ecoex-moulis.cnrs.fr.
Humans influence and depend on natural systems worldwide, creating complex societal-ecological feedbacks that make it difficult to assess the long-term sustainability of contemporary human activities. We use ecological niche theory to consider the short-term (transient) and long-term (equilibrium) effects of improvements in health, agriculture, or efficiency on the abundances of humans, our plant and animal resources, and our natural enemies. We also consider special cases of our model where humans shift to a completely vegetarian diet, or completely eradicate natural enemies. We find that although combinations of health, agriculture, and efficiency improvements tend to support more people and plant resources, they also result in more natural enemies and...
Tipo: Peer-Reviewed Reports
Palavras-chave: Agriculture; Human health; Niche theory.
Ano: 2014

Assembly rules in Muscid Fly assemblages in the grasslands Biome of Southern Brazil
Provedor de dados: 82
Autores: Krüger,Rodrigo F; Carvalho,Claudio J B de; Ribeiro,Paulo B.
The distribution of muscid species (Diptera) in grasslands fragments of southern Brazil was assessed using null models according to three assembly rules: (a) negatively-associated distributions; (b) guild proportionality; and (c) constant body-size ratios. We built presence/absence matrices and calculated the C-score index to test negatively-associated distributions and guild proportionality based on the following algorithms: total number of fixed lines (F L), total number of fi xed columns (F C), and the effect of the average size of the populations along lines (W) for 5000 randomizations. We used null models to generate random communities that were not structured by competition and evaluated the patterns generated using three models: general, trophic...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Community; Competition; Diptera; Muscidae; Niche theory; Null model.
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1519-566X2010000300006

Food resource partitioning among species of Astyanax (Characiformes: Characidae) in the Lower Iguaçu River and tributaries, Brazil
Provedor de dados: 83
Autores: Pini,Suelen F. R.; Abelha,Milza C. F.; Kashiwaqui,Elaine A. L.; Delariva,Rosilene L.; Makrakis,Sergio; Makrakis,Maristela C.
ABSTRACT Resource partitioning allows for interspecific coexistence and is frequently reported for similar species. Here, we predicted the existence of resource partitioning among species of Astyanax that co-occur in the Low Iguaçu River and tributaries in Brazil. A total of 848 stomachs of five species of Astyanax were analyzed. Algae, terrestrial plant and fruit/seed were the most consumed resources. Astyanax bifasciatus and A. dissimilis had predominantly herbivorous diets, A. gymnodontus and A. lacustris were omnivorous, and A. minor was mainly algivorous. Permutational analysis of variance showed the species had different diets, and similarity percentage analysis indicated that fruit/seed and terrestrial plant contributed the most to this...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Coexistence; Congeneric species; Diet; Diet overlap; Niche theory.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252019000500203

Setting boundaries: Environmental and spatial effects on Odonata larvae distribution (Insecta)
Provedor de dados: 42
Autores: Mendes,Thiago P.; Cabette,Helena S. R.; Juen,Leandro.
Environmental characteristics and spatial distances between sites have been used to explain species distribution in the environment, through Neutral (space) and Niche theory (environment) predictions. We evaluated the effects of spatial and environmental factors on Odonata larvae distribution along the Suiá-Missú River Basin, state of Mato Grosso. We tested the hypotheses that (1) the environment is the main factor structuring the community due to its ecophysiological requirements; and (2) the pattern, if present, is clearer for Zygoptera. Samples were made in 12 sites on the Suiá-Missú River Basin in three seasons (2007/2008), with a total of 1.382 Odonata larvae, comprising 10 families, 51 genera and 100 morphospecies. The Anisoptera were more abundant...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Anisoptera; Zygoptera; Neutral theory; Niche theory; Transition Cerrado-Amazon.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652015000100239