نتایج جستجو برای: structural habitat variables

تعداد نتایج: 745422  

2012
Andrew F Johnson Stuart R Jenkins Jan G Hiddink Hilmar Hinz

Introduction 2 Methods 4 Search criteria 4 Statistical analyses and graphical outputs 4 Results 5 Discussion 10 Data limitations and considerations 10 Spatial scale 11 Abstract Adoption of the ecosystem approach to fisheries management relies on recognition of the link between fish and other components of the ecosystem, namely their physical and biological habitat. However, identifying the habi...

ژورنال: اکوبیولوژی تالاب 2021
behravesh, Mahsa, Khalilipour, Olyagholi ,

The Survey of the ecological characteristics of the species and determining their habitat suitability is one of the main principles of management and conservation of wildlife species. Hence, we need methods that can help assess habitats and can estimate, over time, reduce of their quality. To understand the effects of human activities and the changes of a habitat, it is necessary to make quanti...

Identifying environmental factors affecting the habitat preference of medicinal species is a fundamental and valuable action for cultivation and domestication and reducing the pressure on natural resources is a fundamental and valuable action. This study was performed with the purpose of investigate the most important ecological factors affecting the habitat of Stachys lavandulifolia Vahl in ea...

پایان نامه :وزارت علوم، تحقیقات و فناوری - دانشگاه اراک - دانشکده علوم انسانی 1393

this research study aimed to investigate the relationship between field-dependence/independence cognitive style and vocabulary learning strategies among iranian efl learners. ninety participants majoring in english translation at arak university were chosen. the participants were classified into two groups of field-dependent and independent based on the results of group embedded figure test (ge...

Journal: :Ecological Informatics 2010
Thu Huong Hoang Koen Lock Ans M. Mouton Peter L. M. Goethals

a r t i c l e i n f o In the present study, classification trees (CTs) and support vector machines (SVMs) were used to study habitat suitability for 30 macroinvertebrate taxa in the Du river in Northern Vietnam. The presence/absence of the 30 most common macroinvertebrate taxa was modelled based on 21 physical-chemical and structural variables. The predictive performance of the CT and SVM model...

2017
Robert A Francis Jimmy D Taylor Eric Dibble Bronson Strickland Vanessa M Petro Christine Easterwood Guiming Wang

Animal habitat selection, among other ecological phenomena, is spatially scale dependent. Habitat selection by American beavers Castor canadensis (hereafter, beaver) has been studied at singular spatial scales, but to date no research addresses multi-scale selection. Our objectives were to determine if beaver habitat selection was specialized to semiaquatic habitats and if variables explaining ...

ژورنال: اکوبیولوژی تالاب 2020
behravesh, Mahsa, Khalilipour, Olyagholi ,

The Survey of the ecological characteristics of the species and determining their habitat suitability is one of the main principles of management and conservation of wildlife species. Hence, we need methods that can help assess habitats and can estimate, over time, reduce of their quality. To understand the effects of human activities and the changes of a habitat, it is necessary to make quanti...

2017
Yamina Micaela Rosas Pablo L. Peri Alejandro Huertas Herrera Hernán Pastore Guillermo Martínez Pastur

Introduction: Huemul (Hippocamelus bisulcus Molina) is the most threatened flag species of Southern Patagonia, where conservation efforts were not effective to avoid the retraction of its distribution area. Habitat quality modeling can assist to design better management strategies for regional conservation planning. The objective was to elaborate one habitat suitability map for huemul, defining...

Journal: :caspian journal of environmental sciences 2011
r. zarkami

in the present study, classification trees (cts-j48 algorithm) were used to study the occurrence of roach in rivers in flanders (belgium). the presence/absence of roach was modelled based on a set of river characteristics. the predictive performance of the cts models was assessed based on the percentage of correctly classified instances (cci) and cohen's kappa statistics. to find the best model...

Journal: :Environmental Modelling and Software 2015
Paolo Vezza Rafael Muñoz-Mas Francisco Martínez-Capel Ans M. Mouton

Previous research indicated that high predictive performance in species distribution modelling can be obtained by combining both biotic and abiotic habitat variables. However, models developed for fish often only address physical habitat characteristics, thus omitting potentially important biotic factors. Therefore, we assessed the impact of biotic variables on fish habitat preferences in four ...

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