Results 51 to 60 of about 2,523,764 (195)

Simulating Root Density Dynamics and Nitrogen Uptake – Can a Simple Approach be Sufficient? [PDF]

open access: yes, 2007
The modeling of root growth in many plant–soil models is simple and with few possibilities to adapt simulated root proliferation and depth distribution to that actually found with different crop species.
Jensen, Lars Stoumann   +3 more
core  

Plant architectural and genetic diversities in Coffea native from Madagascar : Towards an architectural-functional plant growth model applied to Coffea biodiversity perservation [PDF]

open access: yes, 2011
The Coffea genus includes 103 species with 53 endemic to Madagascar (namely Mascarocoffea).The three main centres of species diversity for coffee trees are Madagascar (naturally low-caffeine species), Cameroon and Tanzania.
Andrianasolo, Domohina Noromalala   +5 more
core  

Uncertainty analysis of species distribution models

open access: yesPLOS ONE, 2019
The maximum entropy model, a commonly used species distribution model (SDM) normally combines observations of the species occurrence with environmental information to predict the geographic distributions of animal or plant species. However, it only produces point estimates for the probability of species existence.
Xi Chen   +2 more
openaire   +3 more sources

Improving multi-species habitat identification through species weighting assignment using joint species distribution model

open access: yesEcological Informatics
Habitat conservation serves as the cornerstone for fishery resource recovery. Traditionally, multi-species habitat predictions are typically generated by stacking individual species' habitat suitability maps using the equal-weighting strategy.
Yunlei Zhang   +6 more
doaj   +1 more source

Did the climate changes cause the extinction of the Late Pleistocene gomphotheres in South America? [PDF]

open access: yesZoologia (Curitiba)
A global wave of megafauna extinctions occurred between 50,000 and 10,000 years ago, impacting numerous large continental mammals that are crucial to ecosystem dynamics.
Evelyn N.S. Cruz   +2 more
doaj   +1 more source

Two-region model for positive and negative plasma sheaths and its application to Hall thruster metallic anodes. [PDF]

open access: yes, 2008
An asymptotic presheath/sheath model for positive and negative sheaths in front of a conducting electrode, with a continuous parametric transition at the no-sheath case, is presented.
Ahedo E.   +6 more
core   +2 more sources

Understanding spatial effects in species distribution models

open access: yesPLOS ONE, 2022
Most Species Distribution Models include spatial effects to improve prediction at unsampled locations and reduce Type I errors. Ecologists tend to try ecologically interpret the spatial patterns displayed by the spatial effect. However, spatial autocorrelation may be driven by many different unaccounted drivers, which complicates the ecological ...
Paradinas, Iosu   +3 more
openaire   +6 more sources

Delineating generalized species boundaries from species distribution data and a species distribution model [PDF]

open access: yesInternational Journal of Geographical Information Science, 2013
Species distribution models (SDM) are commonly used to provide information about species ranges or extents, and often are intended to represent the entire area of potential occupancy or suitable habitat in which individuals occur. While SDMs can provide results over various geographic extents, they normally operate within a grid and cannot delimit ...
Matthew P. Peters   +3 more
openaire   +1 more source

Extinction events and species lifetimes in a simple ecological model

open access: yes, 1998
A model for large-scale evolution recently introduced by Amaral and Meyer is studied analytically and numerically. Species are located at different trophic levels and become extinct if their prey becomes extinct.
Drossel, Barbara
core   +1 more source

Thinning occurrence points does not improve species distribution model performance

open access: yesEcosphere, 2023
Spatial biases are an intrinsic feature of occurrence data used in species distribution models (SDMs). Thinning species occurrences, where records close in the geographic or environmental space are removed from the modeling procedure, is an approach ...
Cleber Ten Caten, Tad Dallas
doaj   +1 more source

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