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Browsing by Author "Müller, Andrea"

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Application of a photo-identification based assessment model to southern right whales in South African waters

Author: Brandão, Anabela ; Butterworth, Doug S ; Müller, Andrea ; Best, Peter B Date: 2012 The three-mature-stages (receptive, calving and resting) model of Cooke et al. (2003) is applied to photo-identification data available from 1979 to 2010 for southern right whales in South African waters. The 2010 number of females having ... Read more
Bayesian assessments of the southern hemisphere humpback whale breeding stock B using three different models for stock-structure

Author: Müller, Andrea ; Butterworth, Doug S ; Johnston, Susan J Date: 2010 Three different models are considered for Southern Hemisphere humpback breeding stock B: Model 1, a single fully-mixed stock; Model 2, reproductively independent stocks B1 off Gabon and B2 of the southern African coastline; and Model 3 with ... Read more
Estimating the abundance of common dolphins on the southern coast of South Africa

Author: Best, Peter B ; Meyer, Michael A ; de Decker, Michelle ; Müller, Andrea ; Sekiguchi, Keiko Date: 2009 Sightings made on an aerial survey in December 1982 and on a ship-based survey in January/February 1983 have been used to assess the size of the population of common dolphins (Delphinus capensis) occurring over the continental shelf south of ... Read more
Humpback whales, rock lobsters and mathematics : exploration of assessment models incorporating stock-structure

Author: Müller, Andrea Date: 2011 This thesis presents four marine resource assessments; three concern the Southern Hemisphere (SH) humpback whale (Megaptera novaeangliae) and one the South African east coast rock lobster Palinurus delagoae. It also sets out the statistical ... Read more
Is the length distribution of C1 and C3 humpback whale catches consistent with an age-structured version of the resident model

Author: Müller, Andrea ; Butterworth, Doug S ; Johnston, Susan J Date: 2009 A sex- and age-structured BALEEN II population model is fitted to population abundance and trend as well as photo-id capture-recapture data for the C1 and C3 humpback whale breeding sub-stocks. The model is of the “Resident” type, i.e. no ... Read more
Is the length distribution of C1 and C3 humpback whale catches consistent with an age-structured version of the resident model

Author: Müller, Andrea ; Butterworth, Doug S ; Johnston, Susan J Date: 2009 A sex- and age-structured BALEEN II population model is fitted to population abundance and trend as well as photo-id capture-recapture data for the C1 and C3 humpback whale breeding sub-stocks. The model is of the “Resident” type, i.e. no ... Read more
Preliminary results for a combined assessment of all seven southern hemisphere humpback whale breeding stocks

Author: Müller, Andrea ; Butterworth, Doug S ; Johnston, Susan J Date: 2010 This paper reports preliminary results from the development of an assessment process that aims to include all seven Southern Hemisphere humpback whale breeding stocks in a single joint assessment, with the purpose of allowing highlatitude ... Read more
Preliminary results for a photo-identification-based assessment of southern right whales in South African waters

Author: Butterworth, Doug S ; Brandão, Anabela ; Müller, Andrea ; Best, Peter B Date: 2011 This working paper presents preliminary results of a photo-id based assessment of southern right whales in South African waters using the three-mature-stages (receptive, calving, resting) model of Cooke et al. (2003). The application of the ... Read more
Preliminary results for a photo-identification-based assessment of southern right whales in South African waters

Author: Butterworth, Doug S ; Brandão, Anabela ; Müller, Andrea ; Best, Peter B Date: 2011 This working paper presents preliminary results of a photo-id based assessment of southern right whales in South African waters using the three-mature-stages (receptive, calving, resting) model of Cooke et al. (2003). The application of the ... Read more
Preliminary results from an assessment of the South African P. delagoae rock lobster resource to investigate the recovery of the resource between two periods of experimental trap-fishing

Author: Müller, Andrea ; Butterworth, Doug S ; Johnston, Susan J Date: 2010 Data from two trap-fishing experiments carried out on the east coast of South Africa targeting the P.delagoae rock lobster, along with trawl-catch information for the years 1985-2009, are used to develop a population assessment for this ... Read more
Prior incoherence within a Bayesian assessment of the Southern Hemisphere humpback whale breeding stock B population

Author: Müller, Andrea ; Butterworth, Doug S Date: 2010 In very simple terms, a Bayesian analysis involves drawing estimatable parameter values from some prior distribution, computing population dynamics and assigning a likelihood value to each combination based on comparisons to data containing ... Read more