Sex, Age, and Individual Differences in Bottlenose Dolphins (Tursiops truncatus) in Response to Environmental Enrichment

Application of environmental enrichment, as a means to successfully decrease undesired behaviors (e.g., stereotypic) and improve animal welfare, has been documented in a variety of zoological species. However, a dearth of empirical evidence exists concerning age, sex, and individual differences in response to various types of enrichment tools and activities in Atlantic bottlenose dolphins (Tursiops […]

The Influence of Age, Sex, and Social Affiliation on the Responses of Bottlenose Dolphins (Tursiops truncatus) to a Novel Stimulus Over Time

Responses to novelty may differ among individuals as a function of age, sex, and/or the presence of offspring, and understanding how marine mammals respond to novel stimuli is critical to management. In this study, 20 captive Atlantic bottlenose dolphins (Tursiops truncatus) were exposed to a novel object, consisting of PVC pipes and either a non-reflective […]

The Characterisation of Underwater Noise at Facilities Holding Marine Mammals

A collaborative effort was undertaken to delineate underwater noise levels within holding enclosures at marine mammal facilities. Ambient noise levels were measured under normal operating conditions in the enclosures of 14 participating facilities. Facility habitats varied from ocean environments to fully enclosed pools. The means and standard errors of the noise pressure spectral densities measured […]

Social behaviors modulate bottlenose dolphins’ (Tursiops truncatus) breathing rate

Breathing frequency is a non-invasive physiological measure that brings valuable information on the bottlenose dolphins’ internal state and behaviors. When combined with behavioral observations, it helps to better understand and interpret relevant behaviors. The present study aimed to investigate some basic characteristics of breathing rate in nine dolphins (Tursiops truncatus) (e.g., age and sex effects) […]

Whistles as potential indicators of stress in bottlenose dolphins (Tursiops truncatus)

We examined the possibility that parameters of bottlenose dolphin signature whistles may serve as indicators of stress. Bottlenose dolphins (Tursiops truncatus) in Sarasota Bay, Florida, were recorded during brief capture–release events, which are potentially a source of short-term stress to these dolphins, although no effects of chronic or long-term stress have been observed over the […]

Captive-born intergeneric hybrid of a Guiana and bottlenose dolphin: Sotalia guianensis×Tursiops truncatus

Abstract Bottlenose dolphins (Tursiops truncatus) and Guiana dolphin (Sotalia guianensis) live in sympatry along the Caribbean Coast of Central and South America and social interactions between these species have been described in the Caribbean Coast of Costa Rica, including sexual encounters. Here we examine and document the only known hybridization event between a male Guiana […]

Interpreting short-term behavioural responses to disturbance within a longitudinal perspective

We documented immediate, behavioural responses of Indo-Pacific bottlenose dolphins (Tursiops sp.) to experimental vessel approaches in regions of high and low vessel traffic in Shark Bay, Western Australia. Experimental vessel approaches elicited significant changes in the behaviour of targeted dolphins when compared with their behaviour before and after approaches. During approaches, focal dolphin groups became […]

Understanding of the concept of numerically “less” by bottlenose dolphins (Tursiops truncatus)

In 2 experiments, bottlenose dolphins (Tursiops truncatus) judged the ordinal relationship between novel numerosities. The dolphins were first trained to choose the exemplar with the fewer number of items when presented with just a few specific comparisons (e.g., 2 vs. 6, 1 vs. 3, and 3 vs. 7). Generalization of this rule was then tested […]

Why Do Dolphins Jump? Interpreting the Behavioural Repertoire of Bottlenose Dolphins (Tursiops sp.) in Doubtful Sound, New Zealand

Only a limited number of studies have tried to determine the purpose of surface behavioural events performed by dolphins. To date only one study has attempted to aggregate the behavioural events observed in a population in contextual groups using co-occurrence as the grouping factor. In the present study, I tried to characterise the behavioural repertoire […]

Modelling the emergence and stability of a vertically transmitted cultural trait in bottlenose dolphins

An apparently vertically, socially transmitted foraging specialization (‘sponging’) in bottlenose dolphins (Tursiops sp.) is observed in two adjacent gulfs within Shark Bay, Western Australia, where sponging has possibly spread from independent innovations. We designed an individual-based model based on empirical data, to investigate the conditions (of learning fidelity and fitness benefits for spongers) under which […]