Causes and consequences of song amplitude adjustment in a territorial bird: a case study in nightingales

Brumm, Henrik

doi:10.1590/s0001-37652004000200017

Cited by 22 publications

(9 citation statements)

References 35 publications

(21 reference statements)

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“…Motivated speaking experiments with interactive tasks are increasingly common in human research, but the non‐natural acoustic and social environment may affect the behaviour of speaking subjects. Experiments into the effect of noise on subjects in more natural communication situations should be conducted, as has been done for non‐human animals of several taxa (Brumm, ; Parks et al ., ). Of particular interest to researchers of human behaviour may be studies of marine mammals, where the vocal behaviour of individual animals has been compared across periods with different noise levels using acoustic recording tags (Parks et al ., ).…”

Section: Future Research Directionsmentioning

confidence: 99%

The Lombard effect and other noise‐induced vocal modifications: insight from mammalian communication systems

Hotchkin

Parks

2013

Biological Reviews

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Humans and non-human mammals exhibit fundamentally similar vocal responses to increased noise, including increases in vocalization amplitude (the Lombard effect) and changes to spectral and temporal properties of vocalizations. Different research focuses have resulted in significant discrepancies in study methodologies and hypotheses among fields, leading to particular knowledge gaps and techniques specific to each field. This review compares and contrasts noise-induced vocal modifications observed from human and non-human mammals with reference to experimental design and the history of each field. Topics include the effects of communication motivation and subject-specific characteristics on the acoustic parameters of vocalizations, examination of evidence for a proposed biomechanical linkage between the Lombard effect and other spectral and temporal modifications, and effects of noise on self-communication signals (echolocation). Standardized terminology, cross-taxa tests of hypotheses, and open areas for future research in each field are recommended. Findings indicate that more research is needed to evaluate linkages among vocal modifications, context dependencies, and the finer details of the Lombard effect during natural communication. Studies of non-human mammals could benefit from applying the tightly controlled experimental designs developed in human research, while studies of human speech in noise should be expanded to include natural communicative contexts. The effects of experimental design and behavioural context on vocalizations should not be neglected as they may impact the magnitude and type of noise-induced vocal modifications.

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Section: Future Research Directionsmentioning

confidence: 99%

The Lombard effect and other noise‐induced vocal modifications: insight from mammalian communication systems

Hotchkin

Parks

2013

Biological Reviews

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“…Natural broadband background noise levels were measured at each site using a Lutron SL‐4001 Sound Level Meter (Coopersburg, PA) with a slow response rate and “A” weighting, the standard settings for measuring ongoing background noise in birdsong studies (Brumm ). We took readings at 10 separate locations around 20 m apart at 0600 h, 0900 h, and 1200 h local time at each study site.…”

Section: Methodsmentioning

confidence: 99%

“…All other sites were sampled in the summer breeding season, birds were morphologically identified as local residents, and none of the other populations receive winter Tasmanian migrants (Mees 1969). Natural broadband background noise levels were measured at each site using a Lutron SL-4001 Sound Level Meter (Coopersburg, PA) with a slow response rate and "A" weighting, the standard settings for measuring ongoing background noise in birdsong studies (Brumm 2004). We took readings at 10 separate locations around 20 m apart at 0600 h, 0900 h, and 1200 h local time at each study site.…”

Section: Field Workmentioning

confidence: 99%

The relative roles of cultural drift and acoustic adaptation in shaping syllable repertoires of island bird populations change with time since colonization

Potvin

Clegg

2015

Evolution

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In birds, song divergence often precedes and facilitates divergence of other traits. We assessed the relative roles of cultural drift, innovation, and acoustic adaptation in divergence of island bird dialects, using silvereyes (Zosterops lateralis). In recently colonized populations, syllable diversity was not significantly lower than source populations, shared syllables between populations decreased with increasing number of founder events, and dialect variation displayed contributions from both habitat features and drift. The breadth of multivariate space occupied by recently colonized Z. l. lateralis populations was comparable to evolutionarily old forms that have diverged over thousands to hundreds of thousands of years. In evolutionarily old subspecies, syllable diversity was comparable to the mainland and the amount of variation in syllable composition explained by habitat features increased by two- to threefold compared to recently colonized populations. Together these results suggest that cultural drift influences syllable repertoires in recently colonized populations, but innovation likely counters syllable loss from colonization. In evolutionarily older populations, the influence of acoustic adaptation increases, possibly favoring a high diversity of syllables. These results suggest that the relative importance of cultural drift and acoustic adaptation changes with time since colonization in island bird populations, highlighting the value of considering multiple mechanisms and timescale of divergence when investigating island song divergence.

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“…Vocal amplitude has generally received little attention in animal communication studies. Recent studies have demonstrated that male common nightingales (Luscinia megarhynchos) are capable of regulating the amplitude of their song dependent upon the level of masking background noise (Brumm and Todt 2002) and can also adjust their vocal amplitude within different social contexts, such as during male-male interactions (Brumm 2004). An increase in amplitude of a vocalization by a signaller in response to increases in background noise, known as the Lombard effect (Lombard 1911), is well known to occur in humans and has been demonstrated in many other species such as birds (Cynx et al 1998), primates ) and cetaceans (Scheifele et al 2005), most recently in the killer whale (Orcinus orca) (Holt et al 2009).…”

Section: Song As An Advertisement Displaymentioning

confidence: 99%

Song function in humpback whales (Megaptera novaeangliae): the use of song in the social interactions of singers on migration

Smith¹

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This thesis is part of a larger collaborative program called the Humpback whale Acoustic Research Collaboration (HARC) and could not exist to the extent that it does without the contributions of many volunteers in the field collecting the acoustic and visual data used in this thesis. Funding for the work contained in this thesis was largely obtained by Michael J. Noad and Doug H. Cato. As the primary supervisor of this thesis, Michael J. Noad provided extensive guidance on the research concept, methodologies and theoretical ideas contained within. He also provided extensive editorial advice on each chapter. Similarly, Anne W. Goldizen as co-supervisor also provided considerable guidance on the research questions and theoretical ideas contained within as well as extensive editorial advice on each chapter. Doug H. Cato provided significant contributions on the project concept, design and methodologies as well extensive guidance on the development of the propagation model and analysis of acoustic data. Dale Stokes contributed to the development of the propagation model through modelling environmental variables and producing sound speed profiles. Rebecca A. Dunlop assisted with the collation and analysis of data for the development of the propagation model as well as collection and collation of acoustic and land based visual data used in this thesis.

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Causes and consequences of song amplitude adjustment in a territorial bird: a case study in nightingales

Cited by 22 publications

References 35 publications

The Lombard effect and other noise‐induced vocal modifications: insight from mammalian communication systems

The Lombard effect and other noise‐induced vocal modifications: insight from mammalian communication systems

The relative roles of cultural drift and acoustic adaptation in shaping syllable repertoires of island bird populations change with time since colonization

Song function in humpback whales (Megaptera novaeangliae): the use of song in the social interactions of singers on migration

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