Structure and Genetic Diversity in Colliguaja odorifera Mol. (Euphorbiaceae), a Shrub Subjected to Pleisto-Holocenic Natural Perturbations in a Mediterranean South American Region

Autor: Bull-Hereñu, Kester, Martínez, Enrique A., Squeo, Francisco A.

Publikováno v: Journal of Biogeography, 2005 Jul 01. 32(7), 1129-1138.

Externí odkaz: https://www.jstor.org/stable/3566383

Neutral illusions, selective nightmares and autopoietic madness Ilusiones neutrales, pesadillas selectivas y locura autopoiética

Autor: CARLOS Y VALENZUELA

Publikováno v: Revista Chilena de Historia Natural, Vol 83, Iss 4, Pp 497-500 (2010)

Until now, there are three evolutionary models: I) The Synthetic Theory of Evolution (STE) also named as the Neo-Darwinian model; II) The Neutral Theory of Evolution (NTE) with its daughter the Nearly-Neutral Theory of Evolution (NNTE); III) The Theo

Externí odkaz: https://doaj.org/article/47ca4fc2e1fd43d5b8ef007721c6de28

Using beta-diversity to differentiate neutral from niche community assembly[ign]. [abstract language='en']According to the niche theory, species assemblies should reflect biotic and abiotic local conditions. In turn, the neutral theory of biodiversity stands that species are equivalent and that local species assembly is the product of colonization and extinction rates. After some years of debate, nowadays, ecologists agree that purely niche or neutral assemblies rarely occur in nature and, in turn, that the rule are assemblies somewhere in the middle. A niche assembly is the product of interspecific interactions or environmental forcing, while a neutral assembly is derived from intrinsic population dynamics (e.g., colonization and extinction rates). The beta-diversity concept (it has various definitions, but all of them share the idea of a link between local [alpha] and regional [gamma] diversity, and, thus, refers to the heterogeneity in species composition between places or times) has become particularly popular during the last decade. It is used to analyze a great variety of systems in different ways. In particular, it gained attention as a tool to differentiate niche- vs neutral-based species assembly. This could be easily addressed using ad hoc neutral models. A pure neutral assembly should exhibit a variability in species composition similar to that expected by randomly selecting species from the regional pool (gamma diversity) for each sample (alpha diversity). The more deviant from the variability expected by chance, the more niche-based assembly. We have greatly expanded our knowledge of the factors that promote one or the other type of assembly. However, there is still much more to elucidate, like how neutral vs. niche assembly is influenced by the interaction between factors, spatio-temporal relationships or if there are scale-dependent variations. In this review, we analyze the potential uses and methodologies associated with this emerging topic in community ecology and discuss some related and interesting scientific questions that remain unanswered. [ign]Keywords: [keygrp scheme='nd'][keyword type='m' language='en']Ecological niche[ign]; [keyword type='m' language='en']Neutral theory[ign]; [keyword type='m' language='en']Diversity patterns[ign]; [keyword type='m' language='en']Null model[ign].[ign]

Autor: Oscar Iribarne, Pedro Daleo, Juan Alberti

Publikováno v: CONICET Digital (CONICET)
Consejo Nacional de Investigaciones Científicas y Técnicas
instacron:CONICET
Ecología austral, Volume: 28, Issue: 1, Pages: 104-112, Published: APR 2018
Ecol. austral 2018;028(01):104-112
Biblioteca Digital (UBA-FCEN)
Universidad Nacional de Buenos Aires. Facultad de Ciencias Exactas y Naturales
instacron:UBA-FCEN
Ecología Austral, Vol 28, Iss 1, Pp 104-112 (2018)

Según la teoría del nicho ecológico, la composición de especies en un lugar dado debería estar determinada por la conjunción de los factores bióticos y abióticos que allí actúan. En cambio, la teoría neutral propone que las especies son eq

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::ba5d00923033b9bc12c782fa4c449a6f
http://ojs.ecologiaaustral.com.ar/index.php/Ecologia_Austral/article/view/622/286

Neutral illusions, selective nightmares and autopoietic madness

Autor: VALENZUELA, CARLOS Y

Publikováno v: Revista chilena de historia natural, Volume: 83, Issue: 4, Pages: 497-500, Published: DEC 2010

Until now, there are three evolutionary models: I) The Synthetic Theory of Evolution (STE) also named as the Neo-Darwinian model; II) The Neutral Theory of Evolution (NTE) with its daughter the Nearly-Neutral Theory of Evolution (NNTE); III) The Theo

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=od_______614::b1ced034cc7ebce4ff79e0608782cd2a
http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2010000400004&lng=en&tlng=en

The niche concept in metacommunities

Autor: Leibold, Mathew A., Geddes, Pamela

Publikováno v: Ecol. austral 2005;015(02):117-129
Biblioteca Digital (UBA-FCEN)
Universidad Nacional de Buenos Aires. Facultad de Ciencias Exactas y Naturales
instacron:UBA-FCEN

La ciencia de la ecología estudia las interacciones de los sistemas biológicos con el medio ambiente. El concepto de nicho ecológico es la base central de este estudio ya que describe cómo organismos en diferentes niveles de organización interac

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=od______3056::84e84c8e20c5350ee2389eee5a1aa34c