Displays of the Jackass Penguin

Eggleton, Patricia; Siegfried, W. R.

doi:10.1080/00306525.1979.9634105

Cited by 30 publications

(27 citation statements)

References 16 publications

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“…Eggleton and Siegfried [17] provided a verbal description of six different vocalisations in wild adult African Penguin. In our study, we found a correspondence for two of these six calls, namely the ecstatic display song and the mutual display song .…”

Section: Discussionmentioning

confidence: 99%

The Vocal Repertoire of the African Penguin (Spheniscus demersus): Structure and Function of Calls

2014

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The African Penguin (Spheniscus demersus) is a highly social and vocal seabird. However, currently available descriptions of the vocal repertoire of African Penguin are mostly limited to basic descriptions of calls. Here we provide, for the first time, a detailed description of the vocal behaviour of this species by collecting audio and video recordings from a large captive colony. We combine visual examinations of spectrograms with spectral and temporal acoustic analyses to determine vocal categories. Moreover, we used a principal component analysis, followed by signal classification with a discriminant function analysis, for statistical validation of the vocalisation types. In addition, we identified the behavioural contexts in which calls were uttered. The results show that four basic vocalisations can be found in the vocal repertoire of adult African Penguin, namely a contact call emitted by isolated birds, an agonistic call used in aggressive interactions, an ecstatic display song uttered by single birds, and a mutual display song vocalised by pairs, at their nests. Moreover, we identified two distinct vocalisations interpreted as begging calls by nesting chicks (begging peep) and unweaned juveniles (begging moan). Finally, we discussed the importance of specific acoustic parameters in classifying calls and the possible use of the source-filter theory of vocal production to study penguin vocalisations.

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Section: Discussionmentioning

confidence: 99%

The Vocal Repertoire of the African Penguin (Spheniscus demersus): Structure and Function of Calls

2014

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“…To determine if there were behavioural differences between visited and non-visited birds in response to this ''visit'', we counted alternate head turns (a defensive behaviour exhibited by Spheniscus penguins; Eggleton and Siegfried 1977;Ellenberg et al 2006;Yorio and Boersma 1992) during four different 1-min intervals distributed through the 15-min visit. At the end of the 15 min, we caught the bird and took a blood sample to determine plasma corticosterone levels secreted in response to the visit.…”

Section: Response To Tourist Visitationmentioning

confidence: 99%

A matter of history: effects of tourism on physiology, behaviour and breeding parameters in Magellanic Penguins (Spheniscus magellanicus) at two colonies in Argentina

2011

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“…When approached in their nest, Magellanic Penguins typically turn their heads back and forth, looking at the approacher first with one eye, then the other. This behavior was first described as "alternate head stare" by Eggleton and Siegfried (1979).…”

Section: Behavioral and Physiological Variablesmentioning

confidence: 99%

Habituation of Adult Magellanic Penguins to Human Visitation as Expressed through Behavior and Corticosterone Secretion

Walker

Boersma

Wingfield

2006

Conservation Biology

218

164

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Ecotourism is increasing worldwide; hence, it is important to know how wildlife are affected behaviorally and physiologically by human visitation. We studied the effects of human visitation on the Magellanic Penguins (Spheniscus magellanicus) at Punta Tombo, Argentina, by monitoring changes in defensive head turns and plasma corticosterone (a hormone secreted in response to stress) for penguins with and without a history of tourist visitation. Habituation to human visitation was rapid. In penguins with no previous exposure to tourists, the number of defensive head turns and level of plasma corticosterone decreased significantly within 5 days of one 15-minute visit/day. Penguins living in tourist-visited and undisturbed areas secreted more corticosterone when captured and restrained than penguins visited by a person. Penguins in tourist areas, however did not show as strong a corticosterone response to capture and restraint as did penguins in areas without tourists. This difference was due to a decreased capability of the adrenocortical tissue to secrete corticosterone in tourist-visited birds. Although our data show no direct negative effects of tourism on Magellanic Penguins at Punta Tombo, consequences of a modification of physiological capabilities (e.g., adrenocortical function) may not become apparent until much later in life. The physiological differences between tourist-visited and undisturbed groups of Magellanic Penguins emphasize the importance of monitoring the effects of anthropogenic disturbances on wildlife at multiple levels.

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Displays of the Jackass Penguin

Cited by 30 publications

References 16 publications

The Vocal Repertoire of the African Penguin (Spheniscus demersus): Structure and Function of Calls

The Vocal Repertoire of the African Penguin (Spheniscus demersus): Structure and Function of Calls

A matter of history: effects of tourism on physiology, behaviour and breeding parameters in Magellanic Penguins (Spheniscus magellanicus) at two colonies in Argentina

Habituation of Adult Magellanic Penguins to Human Visitation as Expressed through Behavior and Corticosterone Secretion

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