Estimating Relative Densities of Breeding Birds by the Line Transect Method

Järvinen, Olli; Väisänen, Rauno

doi:10.2307/3543502

Cited by 145 publications

(89 citation statements)

References 12 publications

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“…Red deer relative abundance data was obtained by spotlighting at night. Counts were transformed into indices of abundance per km [35] and to deer per ha [17] (mean transect length 14.84 ± 13.90 km). At least one experienced observer (Joaquin Vicente and Christian Gortazar) participated in each transect.…”

Section: Estimation Of Red Deer and Wild Boar Relative Abundancementioning

confidence: 99%

Risk factors associated with the prevalence of tuberculosis-like lesions in fenced wild boar and red deer in south central Spain

et al. 2007

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-In recent decades the management of large game mammals has become increasingly intensive in south central Spain (SCS), resulting in complex epidemiological scenarios for disease maintenance, and has probably impeded schemes to eradicate tuberculosis (TB) in domestic livestock. We conducted an analysis of risk factors which investigated associations between the pattern of tuberculosis-like lesions (TBL) in wild boar (Sus scrofa) and red deer (Cervus elaphus) across 19 hunting estates from SCS and an extensive set of variables related to game management, land use and habitat structure. The aggregation of wild boar at artificial watering sites was significantly associated with an increasing risk of detecting TBL in both species, which probably relates to enhanced opportunities for transmission. Aggregation of wild boar at feeding sites was also associated with increased risks of TBL in red deer. Hardwood Quercus spp. forest availability was marginally associated with an increased risk of TB in both species, whereas scrubland cover was associated with a reduced individual risk of TBL in the wild boar. It is concluded that management practices that encourage the aggregation of hosts, and some characteristics of Mediterranean habitats could increase the frequency and probability of both direct and indirect transmission of TB. These findings are of concern for both veterinary and public health authorities, and reveal tuberculosis itself as a potential limiting factor for the development and sustainability of such intensive game management systems in Spanish Mediterranean habitats.Mycobacterium tuberculosis complex / red deer / risk factors / tuberculosis / wild boar

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Section: Estimation Of Red Deer and Wild Boar Relative Abundancementioning

confidence: 99%

Risk factors associated with the prevalence of tuberculosis-like lesions in fenced wild boar and red deer in south central Spain

et al. 2007

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“…Sin embargo, esto no tendría por qué ser así si se pudiese contar con una aproximación lógica y matemática que vinculase la detectabilidad real de cada especie con las proporciones de aves observadas dentro y fuera de esa banda única circular de censo de 25 m de radio. De hecho, hace ya tiempo que existen trabajos demostrando que esta aproximación es posible utilizando el método del transecto lineal (Järvinen y Väisänen, 1975).…”

Section: Cálculo De La Detectabilidadunclassified

Data, Preconceived Notions and Methods: The Case of Population Sizes of Common Breeding Birds in Spain

Carrascal

2011

Ardeola

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“…The index is based on the linear model of Jarvinen & Vaisanen (1975) = Subalpine and scrub stations The relative density per station was computed from the total numbers of birds observed at that station and the effective radius at that group of stations.…”

Section: General Methodsmentioning

confidence: 99%

“…Dawson (1981) argued that all of these techniques have problems and none provides accurate estimates of absolute abundance. He concluded that the most efficient type of survey, given the possible sources of error, was a line transect technique with a near/far ratio (Jarvinen & Vaisanen 1975). Verner (1981) states that: "bird counting is a distressingly imprecise science", and points to the high variance between counts as an indication of the large number of biasing factors.…”

Section: Introductionmentioning

confidence: 99%

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Distribution and abundance of forest birds in the Ruamahanga Ecological Area, North Island, New Zealand

Moffat

Minot

1994

New Zealand Journal of Zoology

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Relationships between forest structure and avian communities have been documented in many northern temperate and tropical studies. This study tests the applicability of conclusions from those studies to New Zealand forest bird communities. For 29 months from September 1982 to February 1985 we monitored the bird community in part of the Ruamahanga Ecological Area, Tararua State Forest Park. We used a modified 5 min bird count to determine the relative abundances of each bird species. The modification consisted of separating the counts into birds near to (<20 m) and far from (>20 m) the observer. The near/far ratio proved useful in assessing the distribution of common bird species but was inadequate for rarer species. Twentynine bird species were seen, 21 of which probably bred within the study area. Eleven forest bird species were seen with sufficient frequency to apply the near/far ratio.Principal component analysis was used as a graphical tool to describe the inter-relationships of bird species distribution with plant species and plant structure. Plant species' composition was a better predictor of bird species' composition than was forest structure. Although the distributions of 10 common bird species were positively correlated with high canopy forest, five of these species were associated with red beech dominated forest and the other five species with podocarp/broadleaf dominated forest. Introduced birds were largely confined to forest margins, suggesting either that the *To whom correspondence should be addressed. Received 20 May 1991; accepted 12 November 1993remaining native birds are successfully excluding introduced birds, or that the forest habitat is unsuitable for the introduced species.

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Estimating Relative Densities of Breeding Birds by the Line Transect Method

Cited by 145 publications

References 12 publications

Risk factors associated with the prevalence of tuberculosis-like lesions in fenced wild boar and red deer in south central Spain

Risk factors associated with the prevalence of tuberculosis-like lesions in fenced wild boar and red deer in south central Spain

Data, Preconceived Notions and Methods: The Case of Population Sizes of Common Breeding Birds in Spain

Distribution and abundance of forest birds in the Ruamahanga Ecological Area, North Island, New Zealand

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