نتایج جستجو برای: habitats

تعداد نتایج: 29048  

2011
Alexandro Caruso Jörgen Rudolphi Håkan Rydin

Biological edge effects are often assessed in high quality focal habitats that are negatively influenced by human-modified low quality matrix habitats. A deeper understanding of the possibilities for positive edge effects in matrix habitats bordering focal habitats (e.g. spillover effects) is, however, essential for enhancing landscape-level resilience to human alterations. We surveyed epixylic...

Journal: :Remote Sensing 2013
Ele Vahtmäe Tiit Kutser

The structure of benthic macrophyte habitats is known to indicate the quality of coastal water. Thus, a large-scale analysis of the spatial patterns of coastal marine habitats enables us to adequately estimate the status of valuable coastal marine habitats, provide better evidence for environmental changes and describe processes that are behind the changes. Knowing the spatial distribution of b...

1997
G. P. Jenkins H. M. A. May M. J. Wheatley M. G. Holloway

Species richness, abundance and biomass of fishes from seagrass and unvegetated habitats were analysed for sites in the Swan Bay region of Port Phillip Bay, and Corner Inlet, Victoria, Australia. Fish assemblages from intertidal Zostera muelleri sites showed greater similarity with a number of shallower unvegetated sites than to subtidal Heterozostera tasmanica. Similarly, subtidal, unvegetated...

2014
Jimena Fraschina Vanina A. León María Busch

The goal of this study was to assess the effect of the different habitats on rodent diversity, and to estimate the effect of changes in land use on the rodent abundance through different possible scenarios. We sampled poultry farms, human houses, riparian habitats, railway embankments, woodlots, pasture, crop fields and their borders. The habitats with highest frequency of captures were poultry...

Journal: :Ecological applications : a publication of the Ecological Society of America 2007
Cameron L Aldridge Mark S Boyce

Detailed empirical models predicting both species occurrence and fitness across a landscape are necessary to understand processes related to population persistence. Failure to consider both occurrence and fitness may result in incorrect assessments of habitat importance leading to inappropriate management strategies. We took a two-stage approach to identifying critical nesting and brood-rearing...

Journal: :iranian journal of science and technology (sciences) 2007
h. r. ghasempour

ferulago angulata (apiaceae), a medicinal plant of western asia, contains essential oils that areused as a food preservative. this study examined and compared the composition of leaf oil with seed oil andof the oils from two different habitats (one from nevakov and the other from shahoo). the oil yield from seedwas 5-fold that from leaves (3.2%/100g compared to 0.63%/100g). cis-ocimene was the ...

2012
Eliningaya J. Kweka Guofa Zhou Stephen Munga Ming-Chieh Lee Harrysone E. Atieli Mramba Nyindo Andrew K. Githeko Guiyun Yan

BACKGROUND Larval control is of paramount importance in the reduction of malaria vector abundance and subsequent disease transmission reduction. Understanding larval habitat succession and its ecology in different land use managements and cropping systems can give an insight for effective larval source management practices. This study investigated larval habitat succession and ecological parame...

Journal: :International Journal of Health Geographics 2009
FM Mutuku MN Bayoh AW Hightower JM Vulule JE Gimnig JM Mueke FA Amimo ED Walker

BACKGROUND A supervised land cover classification was developed from very high resolution IKONOS satellite data and extensive ground truth sampling of a ca. 10 sq km malaria-endemic lowland in western Kenya. The classification was then applied to an investigation of distribution of larval Anopheles habitats. The hypothesis was that the distribution and abundance of aquatic habitats of larvae of...

2012
Suzanne L. Robertson Ian M. Hamilton

Question: How does the risk of infectious disease transmission affect individual habitat selection decisions and the resulting spatial distributions of populations? Mathematical method: We use a differential equation model to describe disease dynamics in two habitats coupled by natal dispersal and use an evolutionary game theoretical approach to calculate the evolutionarily stable strategy for ...

Journal: :Revista de biologia tropical 2014
Consuelo Aguilar Gaspar González-Sansón Yureidy Cabrera Alexei Ruiz R Allen Curry

Movement and exchange of individuals among habitats is critical for the dynamics and success of reef fish populations. Size segregation among habitats could be taken as evidence for habitat connectivity, and this would be a first step to formulate hypotheses about ontogenetic inter-habitat migrations. The primary goal of our research was to find evidence of inter-habitat differences in size dis...

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