نتایج جستجو برای: habitat changes

تعداد نتایج: 918380  

ژورنال: بوم شناسی آبزیان 2014
Zamani Faradonbeh, Mazaher , Eagderi, Soheil , Hashemzadeh Segherloo, Iraj , Tabatabaei, Seyedeh Narjes,

Considering the fact that fish biodiversity conservation and land uses planning, require reliable information about fish distribution and habitat use patterns In order to describe species habitat properties, habitat use and habitat selectivity indices are applied. Relative frequency and environmental variables, depth, width, slope of river, altitude, velocity, substrate, Overstream canopy closu...

Journal: :Journal of personality and social psychology 1971
G P Koocher

2017

Discussion: A large part of both clinical and subclinical lesions found in our daily work are benign and correspond with fibrocystic changes (FCC). This entity is complex and part exhibit traits that define characteristically in MRI and diagnose correctly, but there is another small group of changes that can take the image aspect of cancer. From a complex case, we review the main aspects of the...

2006
Brian D. Todd Betsie B. Rothermel

Forest clearcutting is a form of habitat alteration that drastically alters the landscape and may contribute to declines in amphibian populations. Indeed, many studies have documented decreases in amphibian abundances and species richness in clearcuts. The development of effective conservation strategies to reduce the effects of timber harvesting has been hindered by lack of knowledge of the me...

2012
Melinda J. Laidlaw Paul I. Forster

Changes in the potential habitat of five allopatric species of threatened Macrozamia cycads under scenarios of increased ambient temperature were examined. A lack of seed dispersal, poor recruitment, low seedling survival, obligate pollinator mutualisms and continued habitat loss have led to extant populations being largely restricted to refugia. Models predict that the area of suitable habitat...

Journal: :Biological reviews of the Cambridge Philosophical Society 2006
Robert M Ewers Raphael K Didham

Habitat loss has pervasive and disruptive impacts on biodiversity in habitat remnants. The magnitude of the ecological impacts of habitat loss can be exacerbated by the spatial arrangement -- or fragmentation -- of remaining habitat. Fragmentation per se is a landscape-level phenomenon in which species that survive in habitat remnants are confronted with a modified environment of reduced area, ...

ژورنال: اکوبیولوژی تالاب 2019
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Climate change and human activities have increased negative pressure on natural ecosystems. Wetlands are such ecosystems that widely affected by these negative changes. Birds as a part of wildlife in a wetland have damaged by destruction of wetlands, so, a large group of them, are at risk of extinction. Habitat destruction in wetlands in arid and semi-arid areas has more negative effects on the...

2016
Mark J. Butler Thomas W. Dolan John H. Hunt Kenneth A. Rose William F. Herrnkind MARK J. BUTLER IV THOMAS W. DOLAN JOHN H. HUNT KENNETH A. ROSE WILLIAM F. HERRNKIND

Coastal habitats that serve as nursery grounds for numerous marine species are badly degraded, yet the traditional means of modeling populations of exploited marine species handle spatiotemporal changes in habitat characteristics and life history dynamics poorly, if at all. To explore how nursery habitat degradation impacts recruitment of a mobile, benthic species, we developed a spatially expl...

2008
B. D. Elderd Philip Nott

1. Habitat destruction and fragmentation have led to precipitous declines in a number of species of concern. For these species, traditional models that group individuals into age or stage cohorts may not accurately capture the stochasticity associated with small populations. Additionally, traditional models do not explicitly incorporate landscape-level structure, which becomes increasingly impo...

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