نتایج جستجو برای: five transects

تعداد نتایج: 401798  

2008
M.J.C. Crabbe

In this study I investigated the hypothesis that alterations in macroalgal cover significantly influenced the growth rates of coral colonies on the fringing reefs of Discovery Bay, Jamaica. For colonies of Montastrea annularis, Porites astreoides, and Sidastrea siderea, radial growth rates were significantly (p<0.02) higher at Dairy Bull (where Diadema antillarum had removed macroalgal cover) t...

Choosing management strategies are influencing the vegetation characteristics and plant diversity in rangelands. We have studied the effects of three management treatments including overgrazing, exclusure, and exclusure with restoration operations on vegetation characteristics of plant cover, composition, and diversity in Kiasar Chardange summer rangelands. In each management treatment, three r...

Journal: :Revista de biologia tropical 2014
Georgea Santos Nogueira-Melo Paulo Jorge Parreira Santos Tatiana Baptista Gibertoni

Mangroves are transitional ecosystems between terrestrial and marine environments, and are dis- tinguished by a high abundance of animals, plants, and fungi. Although macrofungi occur in different types of habitat, including mangroves, little is known about their community structure and dynamic. Therefore the aim of this study was to analyze the diversity of macrofungi in a number of Brazilian ...

Journal: :Statistical Methods and Applications 2013
Tiago A. Marques Stephen T. Buckland Regina Bispo Brett Howland

Distance sampling is extensively used for estimating animal density or abundance. Conventional methods assume that location of line or point transects is random with respect to the animal population, yet transects are often placed along linear features such as roads, rivers or shorelines that do not randomly sample the study region, resulting in biased estimates of abundance. If it is possible ...

2007
K. DAVID HYRENBACH WILLIAM J. SYDEMAN

Marine bird at-sea distributions are surveyed using two standardized population surveying techniques: line transects and strip transects (Buckland et al. 1993). Line transects use the perpendicular distances to individual sightings to model a detection function, which quantifies the probability of observing an object given its distance from the trackline. This approach allows for speciesspecifi...

This study was conducted to evaluate the effects of Atriplex canescens on soil properties and organisms' activities under grazing and exclosure conditions at Shahriar rangelands. In each site, four transects were selected by random-systematic method and 10 quadrates of nine m2 were established along transects with 30-m intervals. In each quadrate, the amount of seed per plant, litter and the nu...

Journal: :Marine and Freshwater Research 2023

Context Increasing interest in mesophotic coral ecosystems has shown that reefs deep water show considerable geomorphic and ecological variability among geographic regions.Aims We provide the first investigation of at southern extremity Great Barrier Reef (GBR) to understand biotic gradients habitat niches lower zone.Methods Multibeam data were used target five benthic imagery transects collect...

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