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Research | Open Access

Species limits in the Elegant Pitta (Pitta elegans) complex from Wallacea based on bioacoustic and morphometric analysis

Arya Y. Yue1,2, Elize Y. X. Ng2, James A. Eaton3, Frank E. Rheindt2( )
Bryn Mawr College, Department of Biology, 101 N Merion Ave, Bryn Mawr, PA, 19010, USA
Department of Biological Sciences, National University of Singapore, 16 Science Drive 4, Singapore, 117558, Singapore
A-3A-5, Casa Indah I, Persiaran Surian, 47810, Petaling Jaya, Malaysia
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Abstract

Background

The Elegant Pitta (Pitta elegans) complex displays a remarkable diversity of morphological and bioacoustic traits across five taxa currently recognized as subspecies. They differ in plumage characteristics (such as red versus black belly patches; supercilium color and extent; and white versus black throats), in lifestyle (resident versus migratory) and in vocalizations. We investigated the morphological, bioacoustic and ecological differences across all taxa after recent studies demostrated the importance of these traits in recognizing biological species limits across pittas.

Methods

Morphometric analysis was carried out by measuring tarsus, wing, tail and bill lengths of 15 specimens at the Natural History Museum, UK, and plumages were inspected across 106 unique individuals from four different repositories. Bioacoustic analysis was based on 134 range-wide sound recordings. Two types of calls, territorial calls and alarm calls, were analyzed using different sets of parameters. Principal component analysis and the Isler Criterion were applied to the measurements. Playback trials were conducted to explore the levels of response of each taxon to the call types of the other taxa.

Results

The territorial call of concinna exhibits a distinct two-element motif, while elegans, maria and virginalis utter a three-element motif in which the first two elements are given in quick succession. On the other hand, vigorsii, produces both two-element and three-element motifs with longer breaks in between elements. As further corroborated by the playback trials, the three taxa elegans, virginalis and maria form a tight vocal cluster, whereas each concinna and vigorsii are distinct. The alarm call turned out to be less diagnostic even though most taxa did roughly separate into different vocal clusters. Morphometric analysis failed to produce strong differences, but plumage distinctions among multiple taxa are pronounced.

Conclusions

We suggest splitting the Elegant Pitta into three biological species based on bioacoustic and—less so—plumage evidence: (1) Temminck's Elegant Pitta P. elegans (including subspecies elegans, virginalis and maria), (2) Wallace's Elegant Pitta P. concinna (monotypic), and (3) Banda Elegant Pitta P. vigorsii (monotypic).

Keywords

Bioacoustic analysisElegant PittaMorphometric analysisPitta elegans Territorial calls

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Avian Research
Volume 11 Issue 1,
January 2020
Article number: 42
DOI: 10.1186/s40657-020-00227-4
Cite this article:
Yue AY, Ng EYX, Eaton JA, et al. Species limits in the Elegant Pitta (Pitta elegans) complex from Wallacea based on bioacoustic and morphometric analysis. Avian Research, 2020, 11(1): 42. https://doi.org/10.1186/s40657-020-00227-4

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Received: 11 June 2020
Accepted: 13 October 2020
Published: 28 October 2020
© The Author(s) 2020.

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