Cassie N Speakman

Cassie N Speakman
Deakin University · School of Life and Environmental Sciences

Bachelor of Science

About

10
Publications
1,161
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22
Citations
Citations since 2016
10 Research Items
22 Citations
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Introduction
PhD candidate with the School of Life and Environmental Sciences at Deakin University. My current research focuses on the influence of environmental threats, predominately climate change, on the foraging ecology of Australian fur seals. Research interests include foraging ecology, maternal investment, environmental change, mixed models, bioenergetics, individual-based models.

Publications

Publications (10)
Article
Full-text available
Bioenergetic approaches are increasingly used to understand how marine mammal populations could be affected by a changing and disturbed aquatic environment. There remain considerable gaps in our knowledge of marine mammal bioenergetics, which hinder the application of bioenergetic studies to inform policy decisions. We conducted a priority-setting...
Article
Full-text available
Knowledge of factors affecting a species' breeding biology is crucial to understanding how environmental variability impacts population trajectories and enables predictions on how species may respond to global change. The Australian fur seal (Arctocephalus pusillus doriferus, AUFS) represents the largest marine predator biomass in southeastern Aust...
Article
Full-text available
Knowledge of the factors shaping the foraging behaviour of species is central to understanding their ecosystem role and predicting their response to environmental variability. To maximise survival and reproduction, foraging strategies must balance the costs and benefits related to energy needed to pursue, manipulate, and consume prey with the nutri...
Article
Full-text available
Stable isotope analyses, particularly of carbon (δ 13 C) and nitrogen (δ 15 N), are used to investigate ecological relationships among species. For marine predators, research has shown the main factors influencing their intra-specific and intra-individual isotopic variation are geographical movements and changes in the composition of diet over time...
Article
Full-text available
The highly dynamic nature of the marine environment can have a substantial influence on the foraging behaviour and spatial distribution of marine predators, particularly in pelagic marine systems. However, knowledge of the susceptibility of benthic marine predators to environmental variability is limited. This study investigated the influence of lo...
Article
Full-text available
Substantial variation in foraging strategies can exist within populations, even those typically regarded as generalists. Specializations arise from the consistent exploitation of a narrow behavioral, spatial or dietary niche over time, which may reduce intraspecific competition and influence adaptability to environmental change. However, few studie...
Article
Full-text available
Understanding the factors which influence foraging behaviour and success in marine mammals is crucial to predicting how their populations may respond to environmental change. The Australian fur seal (Arctocephalus pusillus doriferus, AUFS) is a predominantly benthic forager on the shallow continental shelf of Bass Strait, and represents the greates...
Article
Vessel impacts on marine mammals are of growing concern, and marine mammals in urbanized marine environments are at particular risk of exposure. Port Phillip Bay (Victoria, Australia) is one such environment, in which Australian fur seals (AUFS; Arctocephalus pusillus doriferus) haul‐out to rest, yet little is known about the impacts of vessels on...
Article
Animal diets often vary according to age, sex, experience and/or individual preferences, which, when maintained over time, can lead to behavioural consistency and individual specialisations within populations. In addition, behavioural and dietary similarity within breeding pairs confers reproductive benefits in some species. We investigated inter-...

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Projects

Project (1)
Project
Identify how long-term environmental threats influence Australian fur seal foraging behaviour and ecology. This will allow us to further understand how the population is likely to be impacted under anticipated changes to their environment.