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Seasonal acoustic occurrence, diel‐vocalizing patterns and bioduck call‐type composition of Antarctic minke whales off the west coast of South Africa and the Maud Rise, Antarctica

Published on Jan 30, 2020in Marine Mammal Science2.018
· DOI :10.1111/mms.12669
Fannie W. Shabangu2
Estimated H-index: 2
(Mammal Research Institute),
Ken P. Findlay11
Estimated H-index: 11
(Cape Peninsula University of Technology),
Kathleen M. Stafford26
Estimated H-index: 26
(UW: University of Washington)
Abstract
  • References (38)
  • Citations (0)
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Este trabajo final de maestria, modalidad de profundizacion, consiste en la elaboracion de un problema de modelacion estadistica aplicada al sector crediticio. El objetivo es aplicar un modelo de regresion logistica o un modelo de aprendizaje de maquina para calcular la probabilidad de default e incorporarla en la formula para hallar la distribucion de costos totales en el modelo de Mezclas Bernoulli, con el fin de estimar valores de cuartiles superiores de la distribucion de los costos totales,...
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El presente trabajo aborda el problema de seleccion de variables empleando el metodo de bosques aleatorios cuando el modelo subyacente para la variable respuesta es de tipo lineal. Para ello se configuran conjuntos de datos simulados con diferentes caracteristicas, sobre los cuales se aplica la metodologia y se mide el error de prediccion al eliminar cada variable. Con esto se realiza en primera instancia, una evaluacion del algoritmo de seleccion en la que se identifica que este es eficiente cu...
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The eastern Atlantic Ocean is considered to provide important breeding and wintering habitats for several migratory cetacean species. The spatio-temporal distributions and migratory behaviors of cetaceans off southern Africa are nevertheless still poorly understood. This study investigated the temporal patterns of acoustic occurrence of baleen whales in a presumed baleen whale breeding area off Namibia using passive acoustic recordings collected between November 2011 and May 2013. Our results sh...
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#1Denise Risch (SAMS: Scottish Association for Marine Science)H-Index: 12
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Minke whales comprise some of the most widely distributed species of baleen whales, some of which are still regularly targeted by commercial whaling. Here, we review the conservation status of common (Balaenoptera acutorostrata) and Antarctic (Balaenoptera bonaerensis) minke whale populations, against the backdrop of ongoing whaling operations and other anthropogenic threats, including climate change, entanglement in fishing gear, ship strikes and noise pollution. Although some coastal minke wha...
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#1Fannie W. Shabangu (Mammal Research Institute)H-Index: 2
#2Ken P. Findlay (Cape Peninsula University of Technology)H-Index: 11
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Abstract Passive acoustic monitoring was used to detect the sounds of rarely sighted Antarctic blue and fin whales to investigate their seasonal occurrence (as presence or absence of whale calls) and behaviour (as determined from call rates) in the Benguela ecosystem. Data were collected using autonomous acoustic recorders deployed on oceanographic moorings for 16.26 months off the west coast of South Africa in 2014 and 2015. Satellite derived environmental variables were used as predictors of w...
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We introduce the C++ application and R package ranger. The software is a fast implementation of random forests for high dimensional data. Ensembles of classification, regression and survival trees are supported. We describe the implementation, provide examples, validate the package with a reference implementation, and compare runtime and memory usage with other implementations. The new software proves to scale best with the number of features, samples, trees, and features tried for splitting. Fi...
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#1Ken P. Findlay (Cape Peninsula University of Technology)H-Index: 11
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Daily charts of the aerial search effort (432 206 nautical miles) of the Union Whaling Company and 1 099 sightings of 10 497 whales were available from 628 flights off Durban between 1972 and 1975. Densities of whales were analysed by month and water depth distribution over the four-year period. Low observed densities of blue Balaenoptera musculus, right Eubalaena australis, sei B. borealis and humpback Megaptera novaeangliae whales most likely resulted from earlier whaling pressure. Seasonality...
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#1Talia Dominello (UCSD: University of California, San Diego)H-Index: 1
#2Ana Širović (UCSD: University of California, San Diego)H-Index: 12
The Antarctic minke whale (Balaenoptera bonaerensis) is a difficult species to study because of its low visual detectability and preference for living within the sea ice habitat, accessible only by ice-strengthened vessels. Recent identification of the Antarctic minke whale as the source of the seasonally ubiquitous bio-duck call has allowed the use of this sound, as well as downsweeps, to investigate seasonality trends and diel patterns in Antarctic minke whale call production, and their relati...
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Estimating abundance of Antarctic minke whales is central to the International Whaling Commission's conservation and management work and understanding impacts of climate change on polar marine ecosystems. Detecting abundance trends is problematic, in part because minke whales are frequently sighted within Antarctic sea ice where navigational safety concerns prevent ships from surveying. Using icebreaker-supported helicopters, we conducted aerial surveys across a gradient of ice conditions to est...
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