Aerial line transect survey to estimate abundance of marsh deer (Blastocerus dichotomus) (Illiger, 1815)

Andriolo, Artur; Piovezan, Ubiratan; Costa, Mateus José Rodrigues Paranhos da; Laake, Jeff; Duarte, José Maurício Barbanti

doi:10.1590/s1516-89132005000600017

Cited by 22 publications

(18 citation statements)

References 6 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Perpendicular distances were calculated from the aircraft's altitude and the declination angle to the sighting. We defined bands of increasing width, as recommended by Guenzel (1994) and Andriolo et al (2005), which yield 8 intervals with cutpoints at distances of 0,225,494,808,1167,1569,2016,2508, and 3000 m to accommodate clinometer reading errors. Truncation was applied to discard all observations beyond 3000 m. Block G encompassed the southern limit at 23°S and was excluded from the analysis.…”

Section: Methodsmentioning

confidence: 99%

Humpback whales within the Brazilian breeding ground: distribution and population size estimate

Andriolo¹,

Kinas²,

Engel³

et al. 2010

Endang. Species. Res.

View full text Add to dashboard Cite

The potential impact of increasing vessel traffic and coastal development has led to concerns regarding the future of the Brazilian humpback whale Megaptera novaeangliae population. Our objective was to monitor humpback whale abundance in the Brazilian coastal breeding grounds in order to provide information to support future conservation strategies for this species. To this end, a 4 yr series (2002 to 2005) of aerial surveys was implemented. Abundance was estimated using standard line-transect methods. Data were analyzed using the software DISTANCE 5.0. Perpendicular sighting data were modeled using (1) the uniform function with cosine and simple polynomial adjustments, (2) the half-normal function with cosine, and (3) the hazard-rate function with cosine and a simple polynomial series expansion. The model that best fitted the data was selected according to Akaike's Information Criterion (AIC). We estimated the population off the Brazilian coast to be 6404 (CV = 0.11) ind. in 2005. Alternative scenarios are presented to permit the discussion of results obtained from different g (0) corrections (where g (0) is the probability of detecting an animal at distance 0). We confirmed what previous studies have shown, i.e. that the studied population is increasing, and it is expected that new areas will be occupied and conflicts of interests will arise. The results of this study support the Brazilian government's stance against whaling and should be used in national and international debate to help solve conflicts of interest and to find non-lethal solutions.

show abstract

Section: Methodsmentioning

confidence: 99%

Humpback whales within the Brazilian breeding ground: distribution and population size estimate

Andriolo¹,

Kinas²,

Engel³

et al. 2010

Endang. Species. Res.

View full text Add to dashboard Cite

show abstract

“…Among the methods for estimating deer populations, aerial surveys have been used worldwide (Caughley, 1977;Koerth et al, 1997;Andriolo et al, 2005), and applied for the marsh deer since 1976 (Schaller & Vasconcelos, 1978). Studies involving aerial surveys estimated a density of 0.54 ind/km² in the Paraná River basin (Pinder, 1996), 0.32 ind/km² in the Brazilian Pantanal (Mourão et al, 2000), 0.57 ind/km² in Rio Negro State Park (Tomas et al, 1997) and 0.35 ind/km² in Porto Primavera .…”

Section: Palavras-chavementioning

confidence: 99%

Accessing camera trap survey feasibility for estimating Blastocerus dichotomus (Cetartiodactyla, Cervidae) demographic parameters

Peres

Polverini

Oliveira

et al. 2017

Iheringia, Sér. Zool.

View full text Add to dashboard Cite

ABSTRACT. Demographic information is the basis for evaluating and planning conservation strategies for an endangered species. However, in numerous situations there are methodological or financial limitations to obtain such information for some species. The marsh deer, an endangered Neotropical cervid, is a challenging species to obtain biological information. To help achieve such aims, the study evaluated the applicability of camera traps to obtain demographic information on the marsh deer compared to the traditional aerial census method. Fourteen camera traps were installed for three months on the Capão da Cruz floodplain, in state of São Paulo, and ten helicopter flyovers were made along a 13-kilometer trajectory to detect resident marsh deer. In addition to counting deer, the study aimed to identify the sex, age group and individual identification of the antlered males recorded. Population estimates were performed using the capture-mark-recapture method with the camera trap data and by the distance sampling method for aerial observation data. The costs and field efforts expended for both methodologies were calculated and compared. Twenty independent photographic records and 42 sightings were obtained and generated estimates of 0.98 and 1.06 ind/km², respectively. In contrast to the aerial census, camera traps allowed us to individually identify branch-antlered males, determine the sex ratio and detect fawns in the population. The cost of camera traps was 78% lower but required 20 times more field effort. Our analysis indicates that camera traps present a superior cost-benefit ratio compared to aerial surveys, since they are more informative, cheaper and offer simpler logistics. Their application extends the possibilities of studying a greater number of populations in a long-term monitoring.KEYWORDS. Aerial survey, capture-recapture, distance sampling, population estimate, sex ratio.RESUMO. Avaliação da viabilidade do uso de armadilhas fotográficas para estimar parâmetros demográficos de Blastocerus dichotomus (Cetartiodactyla, Cervidae). Informações demográficas constituem a base para a avaliação e planejamento de estratégias de conservação de uma espécie ameaçada. No entanto, em muitas situações existem limitações metodológicas ou financeiras para a obtenção de tais informações para algumas espécies. O cervo-do-pantanal, um cervídeo neotropical ameaçado de extinção, é uma espécie desafiadora para obtenção de informações biológicas. Para suprir essa demanda, o presente trabalho avaliou a aplicabilidade das armadilhas fotográficas para obtenção de informações demográficas de cervo-do-pantanal em comparação com o tradicional método de censo aéreo. Na várzea Capão da Cruz, Estado de São Paulo, foram instaladas 14 armadilhas fotográficas durante três meses e realizados dez sobrevoos de helicóptero num trajeto de 13 km para detecção dos cervos-do-pantanal ali residentes. Além da contagem dos animais, objetivou-se identificar o sexo, a faixa etária e a identificação individual dos machos galhados registrados. As es...

show abstract

“…The weaknesses are that results provide little information on production systems, the associated communities and the causes behind the outcomes observed; limited applicability in the majority of production systems; and a lack of documented experience in their use to survey livestock (examples from the wildlife field include Peres, 1999;Andriolo et al, 2005;Ogutu et al, 2006 Marriott and Wint (1985) and Bourn et al (1994). Further examples (involving wild and feral animals) are provided by Bayliss and Yeomans (1989) and Andriolo et al (2005).…”

Section: Transectsmentioning

confidence: 99%

Motives and values in farming local cattle breeds in Europe: a survey on 15 breeds

Gandini

Avon

Bohte-Wilhelmus

et al. 2010

Anim. Genet. Resour.

View full text Add to dashboard Cite

journal international RECURSOS GENÉTICOS ANIMALES una revista internacionalThe designations employed and the presentation of material in this information product do not imply the expression of any opinion whatsoever on the part of the Food and Agriculture Organization of the United Nations (FAO) concerning the legal or development status of any country, territory, city or area or of its authorities, or concerning the delimitation of its frontiers or boundaries. The mention of specific companies or products of manufacturers, whether or not these have been patented, does not imply that these have been endorsed or recommended by FAO in preference to others of a similar nature that are not mentioned.The views expressed in this information product are those of the author(s) and do not necessarily reflect the views of FAO.Les appellations employées dans ce produit d'information et la présenta-tion des données qui y figurent n'impliquent de la part de l'Organisation des Nations Unies pour l'alimentation et l'agriculture (FAO) aucune prise de position quant au statut juridique ou au stade de développement des pays, territoires, villes ou zones ou de leurs autorités, ni quant au tracé de leurs frontières ou limites. La mention de sociétés déterminées ou de produits de fabricants, qu'ils soient ou non brevetés, n'entraîne, de la part de la FAO, aucune approbation ou recommandation desdits produits de préférence à d'autres de nature analogue qui ne sont pas cités.Les opinions exprimées dans ce produit d'information sont celles du/des auteur(s) et ne reflètent pas nécessairement celles de la FAO.Las denominaciones empleadas en este producto informativo y la forma en que aparecen presentados los datos que contiene no implican, de parte de la Organización de las Naciones Unidas para la Agricultura y la Alimentación (FAO), juicio alguno sobre la condición jurídica o nivel de desarrollo de países, territorios, ciudades o zonas, o de sus autoridades, ni respecto de la delimitación de sus fronteras o límites. La mención de empresas o productos de fabricantes en particular, estén o no patentados, no implica que la FAO los apruebe o recomiende de preferencia a otros de naturaleza similar que no se mencionan.Las opiniones expresadas en esta publicación son las de su(s) autor(es), y no reflejan necesariamente los puntos de vista de la FAO.All rights reserved. FAO encourages the reproduction and dissemination of material in this information product. Non-commercial uses will be authorized free of charge, upon request. Reproduction for resale or other commercial purposes, including educational purposes, may incur fees. Applications for permission to reproduce or disseminate FAO copyright materials, and all queries concerning rights and licences, should be addressed by e-mail to copyright@fao.org or to the Chief, Publishing Policy and Support Branch, Office of Knowledge Exchange, Research and Extension, FAO, Viale delle Terme di Caracalla, 00153 Rome, Italy. © FAO 2010Tous droits réservés. La FAO encourage la reproduction et la diffusion...

show abstract

Aerial line transect survey to estimate abundance of marsh deer (Blastocerus dichotomus) (Illiger, 1815)

Abstract: The objective was to estimate abundance of marsh deer in the Paraná

Cited by 22 publications

References 6 publications

Humpback whales within the Brazilian breeding ground: distribution and population size estimate

Humpback whales within the Brazilian breeding ground: distribution and population size estimate

Accessing camera trap survey feasibility for estimating Blastocerus dichotomus (Cetartiodactyla, Cervidae) demographic parameters

Motives and values in farming local cattle breeds in Europe: a survey on 15 breeds

Contact Info

Product

Resources

About