نتایج جستجو برای: ecological phenomena

تعداد نتایج: 218427  

2011
Sarah Bodbyl-Roels A Townsend Peterson Xiangming Xiao

BACKGROUND Ecological niche modeling integrates known sites of occurrence of species or phenomena with data on environmental variation across landscapes to infer environmental spaces potentially inhabited (i.e., the ecological niche) to generate predictive maps of potential distributions in geographic space. Key inputs to this process include raster data layers characterizing spatial variation ...

Journal: :New Directions for Higher Education 2022

In this chapter, I offer a socio-ecological perspective on sense of belonging, which is designed to aid institutional actors in facilitating equitable opportunities for racially and ethnically minoritized students fulfill their belonging needs. Though important, individual, relational-level interventions alone run the risk pathologizing (REM), prioritizing student-level changes over structures ...

2015
Gisela P. Bellini Alejandro R. Giraudo Vanesa Arzamendia Eduardo G. Etchepare

Communities are complex and dynamic systems that change with time. The first attempts to explain how they were structured involve contemporary phenomena like ecological interactions between species (e.g., competition and predation) and led to the competition-predation hypothesis. Recently, the deep history hypothesis has emerged, which suggests that profound differences in the evolutionary hist...

2017
Majid Bani-Yaghoub

In this paper, a brief review of delay population models and their applications in ecology is provided. The inclusion of diffusion and nonlocality terms in delay models has given more capabilities to these models enabling them to capture several ecological phenomena such as the Allee effect, waves of invasive species and spatio-temporal competitions of interacting species. Moreover, recent adva...

2008
András Báldi

Species–area relationships are amongst the most studied ecological phenomena (Connor & McCoy, 1979; Rosenzweig, 1995; Whittaker, 1998; Báldi & McCollin, 2003; HornerDevine et al., 2004; Martin & Goldenfeld, 2006). They encapsulate the general pattern that larger islands/areas contain more species than smaller ones (e.g. MacArthur & Wilson, 1967). Although there is strong evidence for the genera...

Journal: :Physical review letters 2008
Tobias Reichenbach Erwin Frey

Self-arrangement of individuals into spatial patterns often accompanies and promotes species diversity in ecological systems. Here, we investigate pattern formation arising from cyclic dominance of three species, operating near a bifurcation point. In its vicinity, an Eckhaus instability occurs, leading to convectively unstable "blurred" patterns. At the bifurcation point, stochastic effects do...

2012
Luis Pezo Lanfranco Sabine Eggers

Bioanthropological1 researches carried out in the last few decades have given special emphasis to the study of the relation between disease, as well as social and environmental phenomena, enhancing the already strong connection between lifestyle and health conditions during history of humankind (Cohen & Armelagos, 1984; Katzenberg & Saunders, 2008; Larsen, 1997). Because infectious diseases res...

2002
Alan J. Dix

Real work is complex and rich, involving other people, physical artefacts and constant re-planning of tasks to accommodate the contingencies of the situation. This rich ecology of work is often seen as opposed to more structured and formal methods of task analysis and interface design. This paper discusses a range of phenomena related to ecological settings and show how they can be incorporated...

Journal: :Trends in ecology & evolution 2007
Christian Körner

Altitudinal gradients are among the most powerful 'natural experiments' for testing ecological and evolutionary responses of biota to geophysical influences, such as low temperature. However, there are two categories of environmental changes with altitude: those physically tied to meters above sea level, such as atmospheric pressure, temperature and clear-sky turbidity; and those that are not g...

Journal: :Proceedings of the National Academy of Sciences of the United States of America 2007
Leif Christian Stige Kung-Sik Chan Zhibin Zhang David Frank Nils C Stenseth

For >1,000 years, Chinese officials have recorded the annual abundance of the oriental migratory locust Locusta migratoria manilensis, with the ultimate aim of predicting locust outbreaks. Linking these records with temperature and precipitation reconstructions for the period 957-1956, we show that decadal mean locust abundance is highest during cold and wet periods. These periods coincide with...

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