Photo Credit: Simon J Allen
We have a new paper out in the journal Bioacoustics that shows Welsh bottlenose dolphins produce high frequency signature whistles, the highest frequency recorded for the species so far.
Authors; Helen M. Hiley, Sarah Perry, Steve Hartley & Stephanie L. King
Abstract: Animal communication signals are diverse. The types of sounds that animals produce, and the way that information is encoded in those sounds, not only varies between species but can also vary geographically within a species. Therefore, an understanding of the vocal repertoire at the population level is important for providing insight into regional differences in vocal communication signals. One species whose vocal repertoire has received considerable attention is the bottlenose dolphin. This species is well known for its use of individually distinctive identity signals, known as signature whistles. Bottlenose dolphins use their signature whistles to broadcast their identity and to maintain contact with social companions. Signature whistles are not innate, but are learnt signals that develop within the first few months of an animal’s life. It is therefore unsurprising that studies which have characterized signature whistles in wild populations of bottlenose dolphins have provided evidence of geographic variation in signature whistle structure. Here, we describe the occurrence of signature whistles in a previously unexplored wild population of bottlenose dolphins in Cardigan Bay, Wales. We present the first occurrence of a signature whistle with an ultrasonic fundamental frequency component (>30 kHz), a frequency band that was not thought to be utilized by this species for whistle communication. We also describe the occurrence of an ultrasonic non-signature whistle. Our findings highlight the importance of conducting regional studies in order to fully quantify a species’ vocal repertoire, and call into question the efficacy of those studies that use restricted sampling rates.
The article can be found here: http://www.tandfonline.com/doi/full/10.1080/09524622.2016.1174885
Photo Credit: Donald McMullen/Dolphin Research Center
We are very pleased to announce the publication of our recent study on postpartum signature whistle production in bottlenose dolphins, published in the journal Marine Mammal Science.
Authors; Stephanie L. King, Emily Guarino, Katy Donegan, Jane Hecksher and Kelly Jaakkola.
Summary: Individual vocal signatures play an important role in facilitating maternal care in many animals. In those species where neonates are precocial immediately following parturition, the need for individual recognition between mother and offspring is paramount. In bottlenose dolphins such acoustic recognition signals, termed signature whistles, have been shown to be pivotal in mother-offspring recognition. Here we explored how female bottlenose dolphins used their signature whistle in the weeks leading up to and following the birth of their calves. We show that females significantly increased signature whistle production immediately after the birth of their female calves (LMER, P < 0.0001). Average signature whistle rate increased from 0.14 whistles/min to 0.78 whistles/min, representing a > five-fold increase in postpartum signature whistle production, with rates remaining high for four weeks after birth. Our findings complement those of Fripp and Tyack (2008), and offer further support to the imprinting hypothesis, where calves imprint on their mothers’ signature whistles immediately after parturition. The increase in maternal signature whistle use facilitates the calf’s recognition of its mother’s call before mother-calf separations occur. These results highlight the importance of postpartum signature whistle use in aiding mother-calf recognition in bottlenose dolphins and provide insight into one of the underlying mechanisms that aids mother-offspring recognition in species with precocial young.
You can access the paper here: http://onlinelibrary.wiley.com/doi/10.1111/mms.12317/full
We are pleased to announce the publication of our recent study on the importance of maternal signature whistle use in aiding mother-calf reunions in bottlenose dolphins, published in the journal Behavioural Processes.
Authors; Stephanie L. King, Emily Guarino, Loriel Keaton, Linda Erb, and Kelly Jaakkola.
Abstract: Individual vocal signatures play an important role in parent-offspring recognition in many animals. One species that uses signature calls to accurately facilitate individual recognition is the bottlenose dolphin. Female dolphins and their calves will use their highly individualised signature whistles to identify and maintain contact with one another. Previous studies have shown high signature whistle rates of both mothers and calves during forced separations. In more natural settings, it appears that the calf vocalises more frequently to initiate reunions with its mother. However, little is known about the mechanisms a female dolphin may employ when there is strong motivation for her to reunite with her calf. In this study, we conducted a series of experimental trials in which we asked a female dolphin to retrieve either her wandering calf or a series of inanimate objects (control). Our results show that she used her vocal signature to actively recruit her calf, and produced no such signal when asked to retrieve the objects. This is the first study to clearly manipulate a dolphin's motivation to retrieve her calf with experimental controls. The results highlight that signature whistles are not only used in broadcasting individual identity, but that maternal signature whistle use is important in facilitating mother-calf reunions.
You can access the article at: http://www.sciencedirect.com/science/article/pii/S0376635716300535
I am pleased to announce that I have been award a Society in Science – The Branco Weiss Fellowship. This is a unique postdoc program for scientists with a proven track record who are willing to engage in a dialogue on relevant social, cultural, political or economic issues across the frontiers of their particular discipline. It awards young researchers around the world with a generous personal research grant, giving them the freedom to work on whatever topic they choose anywhere in the world, for up to five years.
You can see my full profile here: http://www.society-in-science.org/stephanie-king.html
I am pleased to announce the publication of “You talkin’ to me? Interactive playback is a powerful yet underused tool in animal communication research” in Biology Letters
Author: Stephanie L King
Abstract: Over the years, playback experiments have helped further our understanding of the wonderful world of animal communication. They have provided fundamental insights into animal behaviour and the function of communicative signals in numerous taxa. As important as these experiments are, however, there is strong evidence to suggest that the information conveyed in a signal may only have value when presented interactively. By their very nature, signalling exchanges are interactive and therefore, an interactive playback design is a powerful tool for examining the function of such exchanges. While researchers working on frog and songbird vocal interactions have long championed interactive playback, it remains surprisingly underused across other taxa. The interactive playback approach is not limited to studies of acoustic signalling, but can be applied to other sensory modalities, including visual, chemical and electrical communication. Here, I discuss interactive playback as a potent yet underused technique in the field of animal behaviour. I present a concise review of studies that have used interactive playback thus far, describe how it can be applied, and discuss its limitations and challenges. My hope is that this review will result in more scientists applying this innovative technique to their own study subjects, as a means of furthering our understanding of the function of signalling interactions in animal communication systems.
You can access the article at: http://rsbl.royalsocietypublishing.org/content/11/7/20150403
I am pleased to announce the publication of “An interim framework for assessing the population consequences of disturbance” in Methods in Ecology and Evolution
Authors; Stephanie L. King, Robert S. Schick, Carl Donovan, Cormac G. Booth, Mark Burgman, Len Thomas and John Harwood
You can access the article at: http://onlinelibrary.wiley.com/doi/10.1111/2041-210X.12411/full
"In today’s Academic Minute, Dr. Stephanie King of the University of St Andrews explains recent findings that point to the use of names by dolphins."
Coverage of our new PNAS paper: http://phenomena.nationalgeographic.com/2013/07/22/scientists-address-wild-dolphins-by-their-natural-names/
I am pleased to announce the publication of “Bottlenose dolphins can use learned vocal labels to address each other” in PNAS
Authors: Stephanie L King and Vincent M Janik
Abstract: In animal communication research, vocal labeling refers to incidents in which an animal consistently uses a specific acoustic signal when presented with a specific object or class of objects.
Labeling with learned signals is a foundation of human language but is notably rare in nonhuman communication systems. In natural animal systems, labeling often occurs with signals that are not
influenced by learning, such as in alarm and food calling. There is a suggestion, however, that some species use learned signals to label conspecific individuals in their own communication system
when mimicking individually distinctive calls. Bottlenose dolphins (Tursiops truncatus) are a promising animal for exploration in this area because they are capable of vocal production learning and can learn to use arbitrary signals to report the presence or absence of objects. Bottlenose dolphins develop their own unique identity signal, the signature whistle. This whistle encodes individual identity independently of voice features. The copying of signature whistles may therefore allow animals to label or address one another. Here, we show that wild bottlenose dolphins respond to hearing a copy of their own signature whistle by calling back. Animals did not respond to whistles that were not their own signature.
This study provides compelling evidence that a dolphin’s learned identity signal is used as a label when addressing conspecifics. Bottlenose dolphins therefore appear to be unique as nonhuman mammals to use learned signals as individually specific labels for different social companions in their own natural communication system.
You can access the article at: http://www.pnas.org/content/110/32/13216.full