scholarly journals Capture-recapture abundance estimate of Guiana dolphins in southeastern Brazil

2012 ◽  
Vol 38 (3) ◽  
pp. 529-541 ◽  
Author(s):  
M Freitas-Nery
Keyword(s):  
Southeastern Brazil ◽  
Abundance Estimate ◽  
Capture Recapture

scholarly journals How many tigers Panthera tigris are there in Huai Kha Khaeng Wildlife Sanctuary, Thailand? An estimate using photographic capture-recapture sampling

Oryx ◽  
2007 ◽  
Vol 41 (4) ◽  
pp. 447-453 ◽  
Author(s):  
Saksit Simcharoen ◽  
Anak Pattanavibool ◽  
K. Ullas Karanth ◽  
James D. Nichols ◽  
N. Samba Kumar
Keyword(s):  
Tropical Forests ◽  
Panthera Tigris ◽  
Test Results ◽  
Wildlife Sanctuary ◽  
Abundance Estimate ◽  
Capture Recapture ◽  
Tiger Conservation ◽  
Tiger Population ◽  
Indian Reserves ◽  
Closure Assumption

AbstractWe used capture-recapture analyses to estimate the density of a tiger Panthera tigris population in the tropical forests of Huai Kha Khaeng Wildlife Sanctuary, Thailand, from photographic capture histories of 15 distinct individuals. The closure test results (z = 0.39, P = 0.65) provided some evidence in support of the demographic closure assumption. Fit of eight plausible closed models to the data indicated more support for model Mh, which incorporates individual heterogeneity in capture probabilities. This model generated an average capture probability $\hat p$ = 0.42 and an abundance estimate of $\widehat{N}(\widehat{SE}[\widehat{N}])$ = 19 (9.65) tigers. The sampled area of $\widehat{A}(W)(\widehat{SE}[\widehat{A}(W)])$ = 477.2 (58.24) km2 yielded a density estimate of $\widehat{D}(\widehat{SE}[\widehat{D}])$ = 3.98 (0.51) tigers per 100 km2. Huai Kha Khaeng Wildlife Sanctuary could therefore hold 113 tigers and the entire Western Forest Complex c. 720 tigers. Although based on field protocols that constrained us to use sub-optimal analyses, this estimated tiger density is comparable to tiger densities in Indian reserves that support moderate prey abundances. However, tiger densities in well-protected Indian reserves with high prey abundances are three times higher. If given adequate protection we believe that the Western Forest Complex of Thailand could potentially harbour >2,000 wild tigers, highlighting its importance for global tiger conservation. The monitoring approaches we recommend here would be useful for managing this tiger population.

scholarly journals Abundance of East coast Australian humpback whales (Megaptera novaeangliae) in 2005 estimated using multi-point sampling and capture-recapture analysis

2020 ◽  
pp. 253-259
Author(s):  
David A. Paton ◽  
Lyndon Brooks ◽  
Daniel Burns ◽  
Trish Franklin ◽  
Wally Franklin ◽  
...  
Keyword(s):  
East Coast ◽  
Megaptera Novaeangliae ◽  
Humpback Whales ◽  
Migration Route ◽  
Closed Population ◽  
Breeding Stock ◽  
Abundance Estimate ◽  
Abundance Estimates ◽  
Capture Recapture ◽  
Near Extinction

The humpback whales (Megaptera novaeangliae) that migrate along the east coast of Australia were hunted to near extinction during the lastcentury. This remnant population is part of Breeding Stock E. Previous abundance estimates for the east Australian portion of Breeding Stock Ehave been based mainly on land-based counts. Here we present a capture-recapture abundance estimate for this population using photo-identificationdata. These data were collected at three locations on the migration route (Byron Bay – northern migration, Hervey Bay and Ballina – southernmigration) in order to estimate the population of humpback whales that migrated along the east coast of Australia in 2005. The capture-recapturedata were analysed using a variety of closed population models with a model-averaged estimate of 7,041 (95% CI 4,075–10,008) whales.

Capture-Recapture Methods in Epidemiological Studies

1996 ◽  
Vol 17 (4) ◽  
pp. 262-266
Author(s):  
Craig Stephen
Keyword(s):  
Reference Population ◽  
Epidemiological Studies ◽  
Population Based ◽  
Clear Understanding ◽  
Indirect Methods ◽  
Abundance Estimate ◽  
Population Sizes ◽  
Capture Recapture ◽  
Incomplete Lists ◽  
True Population

AbstractMedical researchers often are faced with the challenge of estimating the total number of cases in a population based on incomplete samples. Because of a lack of explicit methods for determining if all cases have been counted, indirect methods for estimating the abundance of disease have been developed. Capture-recapture models are an indirect method of estimating population sizes that have been employed in recent epidemiological studies. These methods, derived from techniques developed for studies of animal abundance, estimate the true population size by evaluating the degree of overlap among incomplete lists of cases from existing data sources. Although intuitively appealing, the successful application of these methods is dependent upon a clear understanding of the biology of the disorder involved, the dynamics of the reference population, and the assumptions and robustness of the specific models used. Failure to address these issues can lead to inaccurate and sometimes misleading results. This article describes some of the strengths and limitations of recapture techniques and provides the reader with a foundation from which to explore the methods in further detail.

Capture recapture électroniques en phosphorescence

1952 ◽  
Vol 12 (7) ◽  
pp. 749-801 ◽  
Author(s):  
Daniel Curie
Keyword(s):  
Capture Recapture

Modeling cetacean habitat use in an urban coastal area in southeastern Brazil

2020 ◽  
Vol 642 ◽  
pp. 227-240
Author(s):  
L Lodi ◽  
R Tardin ◽  
G Maricato
Keyword(s):  
Habitat Use ◽  
Protected Areas ◽  
Linear Models ◽  
Anthropogenic Activities ◽  
Buffer Zone ◽  
Humpback Whales ◽  
Southeastern Brazil ◽  
Major Influence ◽  
Cetacean Species ◽  
Few Data

Most studies of cetacean habitat use do not consider the influence of anthropogenic activities. We investigated the influence of environmental and anthropogenic variables on habitat use by humpback Megaptera novaeangliae and Bryde’s whales Balaenoptera brydei off the coast of the Brazilian city of Rio de Janeiro. Although there are 2 marine protected areas (MPAs) in this area, few data are available on cetacean habitat use or on the overlap of different cetacean species within these MPAs. Our aim was to evaluate the effectiveness of the MPAs and propose a buffer zone to better protect the biodiversity of the study area. We conducted systematic surveys and developed spatial eigenvector generalized linear models to characterize habitat use by the species in the study area. Habitat use by humpback whales was influenced only by depth, whereas for Bryde’s whales there was the additional influence of anthropogenic variables. For Bryde’s whales, which use the area for feeding, sea surface temperature and the distance to anchorages had a major influence on habitat use. We also showed that neither of the MPAs in the study area adequately protects the hotspots of either whale species. Most of the humpback whale grid cells with high sighting predictions were located within 2 km of the MPAs, while areas of high sighting prediction of Bryde’s whales were located up to 5 km from the MPAs, closer to beaches. Our findings provide important insights for the delimitation of protected areas and zoning of the MPAs.

Abundance Estimates of Guiana Dolphins (Sotalia guianensis; Van Bénéden, 1864) Inhabiting an Estuarine System in Southeastern Brazil

2019 ◽  
Vol 45 (1) ◽  
pp. 56-65 ◽  
Author(s):  
Aline B. de Mello ◽  
Julia M. B. Molina ◽  
Maja Kajin ◽  
Marcos C. de O. Santos
Keyword(s):  
Southeastern Brazil ◽  
Estuarine System ◽  
Sotalia Guianensis ◽  
Abundance Estimates

Dalechampia margarethiae (Euphorbiaceae), a New Species from Southeastern Brazil

2019 ◽  
Vol 44 (4) ◽  
pp. 832-837
Author(s):  
Rafaela Alves Pereira-Silva ◽  
Sarah Maria Athiê-Souza ◽  
André Laurênio de Melo ◽  
W. Scott Armbruster
Keyword(s):  
New Species ◽  
Southeastern Brazil ◽  
Espírito Santo ◽  
Floral Resin ◽  
Espirito Santo ◽  
A New Species

Abstract—A new species of Dalechampia from southeastern Brazil, belonging to Dalechampia sect. Dioscoreifoliae, is described and illustrated here. Dalechampia margarethiae is a twining vine occurring exclusively in Espírito Santo state. Its pseudanthia are similar to those of D. peckoltiana and D. pentaphylla, but D. margarethiae differs in a set of important characters, including having cylindrical, down-curved style tips, staminate flowers at anthesis having unreflexed sepals with stamens born on unelongated columns, whitish floral resin, and simple, entire, cordate leaves.

EVIDENCE OF NEOPROTEROZOIC BACKARC BASIN DEVELOPMENT IN THE CENTRAL RIBEIRA BELT, SOUTHEASTERN BRAZIL: NEW GEOCHRONOLOGICAL AND GEOCHEMICAL CONSTRAINTS FROM THE SÃO ROQUE - AÇUNGUI GROUPS

2000 ◽  
Vol 30 (1) ◽  
pp. 110-114 ◽  
Author(s):  
PETER CHRISTIAN HACKSPACHER ◽  
ELTON LUIZ DANTAS ◽  
ANGELO SPOLADORE ◽  
ALLEN HUTCHESON FETTER ◽  
MARCOS AURÉLIO FARIA DE OLIVEIRA
Keyword(s):  
Southeastern Brazil ◽  
Backarc Basin ◽  
Basin Development ◽  
Geochemical Constraints

Geology and geochronology of Monte de Trigo island alkaline suite, southeastern Brazil

2009 ◽  
Vol 39 (1) ◽  
pp. 67-80 ◽  
Author(s):  
Gaston Eduardo Rojas Enrich ◽  
Excelso Ruberti ◽  
Celso de Barros Gomes
Keyword(s):  
Southeastern Brazil
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