Guidelines for Line Transect Sampling of Biological Populations

Anderson, David R.; Laake, Jeffrey L.; Crain, Bradford R.; Burnham, Kenneth P.

doi:10.2307/3800636

Cited by 146 publications

(81 citation statements)

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“…Line transects [34] were used to assess densities of diurnal primates. Transects were established perpendicular to the altitudinal gradient totalling 4,420, 4,256, and 6,243 m in WKSFR, USFR and NDUFR, respectively.…”

Section: Relative Densitiesmentioning

confidence: 99%

Relative Densities of Mammals in Response to Different Levels of Bushmeat Hunting in the Udzungwa Mountains, Tanzania

Topp-Jørgensen

Nielsen

Marshall

et al. 2009

Tropical Conservation Science

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Bushmeat hunting constitutes the most immediate threat to wildlife populations in the Udzungwa Mountains of the Eastern Afromontane biodiversity hotspot. This study assesses the impact of hunting by comparing densities of mammalian species between the little hunted West Kilombero Scarp Forest Reserve (WKSFR), the medium-hunted Udzungwa Scarp Forest Reserve (USFR) and the intensively hunted New Dabaga Ulongambi Forest Reserve (NDUFR). Of the 22 species recorded, 20 were present in WKSFR, 17 in USFR and 12 in NDUFR. Most large species (>40 kg.) were absent from hunted areas, while medium-sized species were reduced more than smaller species. Few traces of Abbott's duiker were observed in hunted areas and bush pig was reduced by more than 85% in hunted areas. Hunting appears to have little effect on relative abundance of primates, blue duiker, Harvey's duiker, aardvark, eastern tree hyrax, and giant pouched rat in USFR, at least for those areas surveyed. In NDUFR relative abundance of most mammals are reduced compared to the less hunted reserves. The exception is red colobus which were no less abundant than USFR. However in NDUFR, transects were placed in the best quality habitat for these habitat-sensitive monkeys, thus emphasising the additional role of habitat degradation. The effect of hunting appears to be proportional to the size of the species and the intensity of hunting, although effects of life history strategy, forest fragment size, isolation, and previous logging cannot be excluded. Reduction of hunting levels are paramount to the survival of large bodied species in USFR and for the continued presence of most species in NDUFR. This study furthermore constitutes an important baseline for monitoring the effect of current efforts to implement joint forest management in the Udzungwa Mountains.

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Section: Relative Densitiesmentioning

confidence: 99%

Relative Densities of Mammals in Response to Different Levels of Bushmeat Hunting in the Udzungwa Mountains, Tanzania

Topp-Jørgensen

Nielsen

Marshall

et al. 2009

Tropical Conservation Science

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“…A Line-transect census method was employed to assess the current population status of Burchell's zebra as adopted by Ratti et al (1983), Brennan and Block (1996) for different mammals and Yisehak et al (2007) for zebra. Line-transect sampling was designed based on six straight transect lines or a series of straight line segments (Anderson et al, 1979). Each of these transect-lines was 8 km long and located randomly in the study area using Global positioning system (GPS).…”

Section: Methodsmentioning

confidence: 99%

Distribution, abundance and population status of Burchells zebra (Equus quagga) in Yabello Wildlife Sanctuary, Southern Ethiopia

Regassa¹

2013

J. Ecol. Nat. Environ.

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A study on the distribution, abundance and population status of Burchell's zebra (Equus quagga, Gray 1824) was carried out in the Yabello Wildlife Sanctuary, Southern Ethiopia from October, 2009 to March, 2010 including wet and dry seasons. Distance sampling line-transect counting method was used to estimate the population status. A total of 5151 individuals were estimated with a population density of 6.5 km 2 . The population was female biased. The sex ratio of adult male to adult female was 1.0:1.27 and adult to young ratio was 2.9:0.6. Age composition of Burchell's zebra comprised 78.2% adult, 13.0% subadult, 5.3% juvenile and 3.5% foal. Group size changed seasonally and the mean group size was 12.5. The average herd sizes of one male harem and bachelor stallion herds were 7.8 and 5.3, respectively. Distribution and vegetation utilization of the animal showed a marked preference for open grassland habitat. However, there was a seasonal change in the preference of habitat. Increase in human and livestock population was observed in the study area. Overgrazing by cattle and encroachment are the primary factors that affect the population status of Burchell's zebra by reducing the grass quality in the Sanctuary. The study recommends an effective and realistic management policy to control illegal human settlement and encroachment in the sanctuary.

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“…Proportions of bare and manure-covered ground were measured perpendicular to the stream by the line transect method (Canfield 1941;Anderson et al 1979) over a 15.2-m distance beginning at the edge of the stream. One hundred beads, spaced at 15.2-cm intervals on the line, were used to evaluate the percentages of bare and manure-covered ground located directly underneath each bead at each location.…”

Section: Riparian Area Characteristicsmentioning

confidence: 99%

Stocking Rate and Riparian Vegetation Effects on Physical Characteristics of Riparian Zones of Midwestern Pastures

Bear

Russell

Tüfekçioğlu

et al. 2012

Rangeland Ecology & Management

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Grazing at high stocking rates May Increase sediment and nutrient loading of streams pasture Through Transport in precipitation runoff and bank erosion. A 3-yr (2007)(2008)(2009)) grazing study was Conducted on 13 cool-season grass pastures to quantify effects of stocking rate and botanical composition on forage sward height, proportions of bare and manure-covered ground, and bank erosion adjacent to streams. Pastures ranged from 2 ha to 107 ha with stream Reaches of 306 m to 1778 m That has drained watersheds of 253 to 5660 ha. Bare and manure-covered ground Were Measured at 15.2-m distance perpendicular to the stream at 30.5-m intervals at up to 30 locations on each side of the stream by the line transect method in May, July, September, and November of each year.At the midpoint of the 15.2-m line, forage sward height was Measured with a falling plate meter (4.8 kg · m -2 ) and plant species identified. In November 2006, fiberglass pins (1.6 × 76.2 cm) 73.7 cm Were driven into the stream bank at 1-m intervals from the streambed to the top of the bank along 10 transect equidistant locations on each side of the stream bank erosion to measure During spring, summer, and fall of each year. Increasing pasture stocking rates Increased manure-covered ground and Decreased sward height, but did not Affect proportions of bare ground. The greatest, intermediate, and Least net soil erosion rates occurred During the winter / early spring, late spring / early summer, and late summer / fall seasons. Stocking rates Between measurements, Expressed as cow-days · m -1 stream, Were not related to bank erosion. Increasing stocking rates per unit of stream length will cover manure Increase and decrease forage sward height, but not Affect proportions of bare ground or bank erosion rates pasture adjacent to streams.THEREFORE, managing stocking rates May reduce nutrient loading of streams pasture. BioOne sees sustainable scholarly publishing as an inherently collaborative enterprise connecting authors, nonprofit publishers, academic institutions, research libraries, and research funders in the common goal of maximizing access to critical research. Stocking Rate and Riparian Vegetation Effects on Physical Characteristics of Riparian Zones of Midwestern PasturesAuthor (s) AbstractGrazing at high stocking rates may increase sediment and nutrient loading of pasture streams through transport in precipitation runoff and bank erosion. ) and plant species identified. In November 2006, fiberglass pins (1.6 3 76.2 cm) were driven 73.7 cm into the stream bank at 1-m intervals from the streambed to the top of the bank along 10 equidistant transect locations on each side of the stream to measure bank erosion during spring, summer, and fall of each year. Increasing pasture stocking rates increased manure-covered ground and decreased sward height, but did not affect proportions of bare ground. The greatest, intermediate, and least net soil erosion rates occurred during the winter/early spring, late spring/early summer, and late summer/fall se...

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Guidelines for Line Transect Sampling of Biological Populations

Cited by 146 publications

References 0 publications

Relative Densities of Mammals in Response to Different Levels of Bushmeat Hunting in the Udzungwa Mountains, Tanzania

Relative Densities of Mammals in Response to Different Levels of Bushmeat Hunting in the Udzungwa Mountains, Tanzania

Distribution, abundance and population status of Burchells zebra (Equus quagga) in Yabello Wildlife Sanctuary, Southern Ethiopia

Stocking Rate and Riparian Vegetation Effects on Physical Characteristics of Riparian Zones of Midwestern Pastures

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