Sunday, August 8, 2010

Agent-based Modeling of Animal Movement: A Review - Tang - 2010 - Geography Compass - Wiley Online Library

Agent-based Modeling of Animal Movement: A Review - Tang - 2010 - Geography Compass - Wiley Online Library: "Animal movement is a complex spatiotemporal phenomenon that has intrigued researchers from many disciplines. Interactions among animals, and between animals and the environments that they traverse, play an important role in the development of the complex ecological and social systems in which they are embedded. Agent-based models have been increasingly applied as a computational approach to the study of animal movement across landscapes. In this article, we present a review of agent-based models in which the simulation of animal movement processes and patterns is the central theme."

Irruptive Dynamics and Vegetation Interactions - Dynamics of Large Herbivore Populations in Changing Environments: Towards Appropriate Models - Gross - Wiley Online Library

Irruptive Dynamics and Vegetation Interactions - Dynamics of Large Herbivore Populations in Changing Environments: Towards Appropriate Models - Gross - Wiley Online Library: "irruptive dynamics and vegetation interactions;irruption, leading to severe mortality associated with vegetation degradation;concept of irruptive herbivore dynamics, by Leopold;herbivore–vegetation interaction models and herbivore dynamics;irruptive dynamics, ungulate populations on islands-prone to extreme irruptions;Isle Royale population - standing out for cyclic behavior;wolf population crash on Isle Royale - precipitating irruption of moose;irruption effects on vegetation;harsh weather, and population crashes - weather and food availability interaction;large herbivore management - hinging on philosophical basis of management"

THE ORIGINS OF SEXUAL DIMORPHISM IN BODY SIZE IN UNGULATES - P�rez-Barber�a - 2007 - Evolution - Wiley Online Library

THE ORIGINS OF SEXUAL DIMORPHISM IN BODY SIZE IN UNGULATES - P�rez-Barber�a - 2007 - Evolution - Wiley Online Library: "Jarman (1974) proposed a series of relationships between habitat use, food dispersion, and social behavior and hypothesized a series of evolutionary steps leading to sexual dimorphism in body size through sexual selection in African antelope species. The hypothesis states that sexual size dimorphism evolved in a three-step process. Initially, ancestral monomorphic and monogamous ungulate species occupying closed habitats radiated into open grassland habitats."

Correlation of relative muzzle width and relative incisor width with dietary preference in ungulates - JANIS - 2008 - Zoological Journal of the Linnean Society - Wiley Online Library

Correlation of relative muzzle width and relative incisor width with dietary preference in ungulates - JANIS - 2008 - Zoological Journal of the Linnean Society - Wiley Online Library: "Qualitative observations suggest that grazing ungulates have relatively broader muzzles than browsing ones, and that grazers have incisors that are all of a similar size, as opposed to the large central and smaller lateral incisors seen in browsers. These differences may be correlated respectively with the need for grazing ungulates to maintain a large daily intake, or for browsing ungulates to forage selectively in a stand of vegetation."

Incorporating Collateral Data in Conservation Biology - LINACRE - 2004 - Conservation Biology - Wiley Online Library

Incorporating Collateral Data in Conservation Biology - LINACRE - 2004 - Conservation Biology - Wiley Online Library: "Conservation biologists often need to set ecological modeling assumptions or estimate parameters from sparse data. In some cases this problem can be addressed by incorporating data from closely related species or from the same species at different sites (i.e., collateral data). Currently no structured methods exist for incorporating such information."

Monday, July 19, 2010

BioOne Online Journals - Linking Top-Down Forces to the Pleistocene Megafaunal Extinctions

BioOne Online Journals - Linking Top-Down Forces to the Pleistocene Megafaunal Extinctions: "Humans, in conjunction with natural top-down processes and through a sequence of cascading trophic interactions, may have contributed to the Pleistocene megafaunal extinctions. The arrival of the first humans, as hunters and scavengers, through top-down forcing, could have triggered a population collapse of large herbivores and their predators."

ESA Online Journals - Interacting regime shifts in ecosystems: implication for early warnings

ESA Online Journals - Interacting regime shifts in ecosystems: implication for early warnings: "Big ecological changes often involve regime shifts in which a critical threshold is crossed. Thresholds are often difficult to measure, and transgressions of thresholds come as surprises. If a critical threshold is approached gradually, however, there are early warnings of the impending regime shift. For example, in a one-dimensional ecosystem dynamics, autocorrelation approaches 1 from below, variance and skewness increase, and variance spectra shift to lower frequencies"