نتایج جستجو برای: transects

تعداد نتایج: 2740  

2005
Ian M. Westbrooke Ralph G. Powlesland

This study investigates the hypothesis that tomtits are significantly less susceptible to 1080 poison operations when cereal rather than carrot bait applications are used, both at relatively low sowing rates. We made counts of territorial male tomtits along transects during standard 1080 possum control operations in 2001 to 2003. The transects had 3–5 kg ha sowing rates of either carrot or cere...

2015
Chris M. Roelfsema Eva M. Kovacs Stuart R. Phinn

This paper describes seagrass species and percentage cover point-based field data sets derived from georeferenced photo transects. Annually or biannually over a ten year period (2004-2014) data sets were collected using 30-50 transects, 500-800 m in length distributed across a 142 km(2) shallow, clear water seagrass habitat, the Eastern Banks, Moreton Bay, Australia. Each of the eight data sets...

Journal: :Environmental management 2004
Robert S Thompson Sarah L Shafer Katherine H Anderson Laura E Strickland Richard T Pelltier Patrick J Bartlein Michael W Kerwin

Ecoregion classification systems are increasingly used for policy and management decisions, particularly among conservation and natural resource managers. A number of ecoregion classification systems are currently available, with each system defining ecoregions using different classification methods and different types of data. As a result, each classification system describes a unique set of e...

2017
Carrie L Branch Joshua P Jahner Dovid Y Kozlovsky Thomas L Parchman Vladimir V Pravosudov

Montane habitats are characterized by predictably rapid heterogeneity along elevational gradients and are useful for investigating the consequences of environmental heterogeneity for local adaptation and population genetic structure. Food-caching mountain chickadees inhabit a continuous elevation gradient in the Sierra Nevada, and birds living at harsher, high elevations have better spatial mem...

2010
M. L. Silveira N. B. Comerford K. R. Reddy J. Prenger W. F. DeBusk

Soil organic carbon (C) dynamics have been used to assess sustainable land managements in forest ecosystems. Impact, defined as intensive forms of land use that affect the soil function, can change C quantity and quality in soils, leading to a progressive degradation of the ecosystems. Soil CO2 effluxes were studied in five transects located at the Fort Benning military reservation in west-cent...

Journal: :Environmental science and pollution research international 2013
Jacob F Thomas Richard M Engeman Eric A Tillman Justin W Fischer Steve L Orzell Deborah H Glueck Rodney K Felix Michael L Avery

Ecological sampling can be labor intensive, and logistically impractical in certain environments. We optimize line intercept sampling and compare estimation methods for assessing feral swine damage within fragile wetland ecosystems in Florida. Sensitive wetland sites, and the swine damage within them, were mapped using GPS technology. Evenly spaced parallel transect lines were simulated across ...

2012
Jos Barlow Juliana M. Silveira Luiz A. M. Mestre Rafael B. Andrade Gabriela Camacho D'Andrea Julio Louzada Fernando Z. Vaz-de-Mello Izaya Numata Sébastien Lacau Mark A. Cochrane

Fire has become an increasingly important disturbance event in south-western Amazonia. We conducted the first assessment of the ecological impacts of these wildfires in 2008, sampling forest structure and biodiversity along twelve 500 m transects in the Chico Mendes Extractive Reserve, Acre, Brazil. Six transects were placed in unburned forests and six were in forests that burned during a serie...

2017
Walter H. Schacht Jerry D. Volesky Dennis Bauer Alexander Smart Eric Mousel WALTER H. SCHACHT JERRY D. VOLESKY DENNIS BAUER

Topography is an important factor in determining vegetation patterns in grasslands. We collected frequency of occurrence data from transects on dune tops, south-facing slopes, north-facing slopes, and interdunal valleys in the eastern Sandhills of Nebraska to determine the effect of topographical position on plant species composition. We used canonical discriminant analysis to separate the four...

2017

1. Bumblebee nests are difficult to find in sufficient numbers for well replicated studies. Counts of nest-searching queens in spring and early summer have been used as an indication of preferred nesting habitat, but this relationship has not yet been validated; high densities of nest-searching queens may indicate habitat with few nesting opportunities (meaning that queens have to spend longer ...

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