Topic
Phylloscopus bonelli
About: Phylloscopus bonelli is a research topic. Over the lifetime, 20 publications have been published within this topic receiving 240 citations.
Papers
TL;DR: MtDNA sequence data promise to be very useful in quantifying the genetic differentiation and phylogenetic relationships among closely related species, especially in morphologically poorly differentiated genera like Phylloscopus.
Abstract: The mitochondrial genetic differentiation and molecular phylogenetic relationships of western and eastern Bonelli's Warblers (Phylloscopus b. bonelli, P. b. orientalis) and Green Warbler Phylloscopus nitidus were investigated. The cytochrome b gene was amplified by polymerase chain reaction and 1038 nucleotides were sequenced directly in these and several other Phylloscopus species plus Sylvia atricapilla and Acrocephalus scirpaceus. The mitochondrial genetic distance between eastern and western Bonelli's Warblers was as large (8.3-8.6%) as between each of them and the Wood Warbler P. sibilatrix. Compared to the amount of mtDNA differentiation between other closely related species and subspecies of birds, the divergence between the Bonelli's warblers is far greater than among typical subspecies. Together with the distinct differences in calls and structure of song elements the genetic data support full species status of the two taxa. The cytochrome b sequence of P. nitidus differed by 2.5-3.1% from P. trochiloides, to which it is most closely related. This divergence is also larger than between most subspecies of birds studied so far at this locus and is consistent with the placement of P. nitidus as an allospecies within the superspecies P. [trochiloides]. We discuss population-genetic scenarios for a potentially accelerated rate of mtDNA differentiation in relatively small, geographically isolated populations that might help to explain the large sequence divergence observed. A phylogenetic tree was constructed by maximum parsimony and neighbour-joining. Chiffchaff P. collybita and Willow Warbler P. trochilus are sister species and together form the sister group of Bonelli's and Wood Warblers. As expected, Arctic Warbler P. borealis was found to be the sister species of the Greenish Warbler complex (including nitidus), whereas the relationships of P. (inornatus) humei relative to the other species could not be resolved. Among the taxa studied, those without wing-bars belong to a phylogenetically older clade than those with wing-bars. MtDNA sequence data promise to be very useful in quantifying the genetic differentiation and phylogenetic relationships among closely related species, especially in morphologically poorly differentiated genera like Phylloscopus.
114 citations
TL;DR: The notion of "rejection markers" permitting the bird to reject some signals close to their own, by deciding rapidly and without ambiguity which behaviour to adopt, is introduced, showing that the species markers are not always constituted by the least variable parameters.
Abstract: The analysis. The song of territorial proclamation of P. bonelli has shown that the most stable parameters were the duration of the song, the number of units constituting them, the lower limit of the acoustic spectrum, and the form of certain elements. The most fluctuating parameters were the factors of duration of sequences and silences between songs, the rhythms in the songs, the upper limit of the acoustic spectrum, and to the form of certain sub-units. The experimentation. The experimentation shows us that the species markers are not always constituted by the least variable parameters. The most important species markers for this bird are: the sense of the frequency modulation against time, the distribution of acoustic energy in the lower part of the spectrum, the purity of the frequencies, and a sufficient duration of the signal. We have introduced the notion of "rejection markers" permitting the bird to reject some signals close to their own, by deciding rapidly and without ambiguity which behaviour to adopt. In the case of P. bonelli as an example we have discussed the relations existing between the individual variability and the fixity of species characters. We have concluded that it is a question of two aspects of the same phenomennon.
62 citations
TL;DR: It is found that plasticine may misrepresent the responses to experimental parasitism, at least in small host species, because this material facilitates egg ejection, provoking a decrease in nest desertion rate.
Abstract: Given the high costs of brood parasitism, avian hosts have adopted different defences to counteract parasites by ejecting the foreign egg or by deserting the parasitized nest. These responses depend mainly on the relative size of the host compared with the parasitic egg. Small hosts must deal with an egg considerably larger than their own, so nest desertion becomes the only possible method of egg rejection in these cases. The use of artificial model eggs made of hard material in egg-recognition experiments has been criticized because hard eggs underestimate the frequency of egg ejection. However, no available studies have investigated the effect of softer material. Here, we test the potential effect of size of dummy parasitic eggs in relation to egg-rejection behaviour (egg ejection and nest desertion rates) in Western Bonelli's Warbler Phylloscopus bonelli, a small host, using plasticine non-mimetic eggs of three different sizes. In addition, we tested the potential effect of material, comparing ejection and desertion responses between real and plasticine eggs. As predicted, small eggs were always ejected, whereas nest desertion occurred more frequently with large eggs, thus suggesting that nest desertion occurs because of the constraints imposed by the large eggs. We found that plasticine may misrepresent the responses to experimental parasitism, at least in small host species, because this material facilitates egg ejection, provoking a decrease in nest desertion rate. Thus, particular caution is needed in the interpretation of the results in egg-rejection experiments performed using dummy eggs made of soft materials.
25 citations
TL;DR: Sonographic analyses of songs and calls of Bonelli's Warbler show important structural differences between the geographically isolated western and eastern populations, suggesting that these populations may be separating into 2 species.
Abstract: Sonographic analyses of songs and calls of Bonelli's Warbler (Phylloscopus bonelli) show important structural differences between the geographically isolated western (P.b. bonelli) and eastern (P.b. orientalis) populations. Playback experiments in the field and some morphological differences suggest that these populations may be separating into 2 species.
11 citations
1 Jan 1998
TL;DR: In this paper, the distribution of birds in the Cape Verde Islands is presented, including records of seven taxa new tot the archipelago, viz. Montagu's Harrier Circus pygargus, Solitary Sandpiper Tringa solitaria, Namaqua Dove Oena capensis, Red-throated Pipit Anthus cervinus, Savi's Warbler Locustella luscinioides, Western Bonelli’s Warbler Phylloscopus bonelli, and Southern Grey Shrike Lanius meridionalis.
Abstract: Recent data on the distribution of birds in the Cape Verde Islands are presented, including records of seven taxa new tot the archipelago, viz. Montagu’s Harrier Circus pygargus, Solitary Sandpiper Tringa solitaria, Namaqua Dove Oena capensis, Red-throated Pipit Anthus cervinus, Savi’s Warbler Locustella luscinioides, Western Bonelli’s Warbler Phylloscopus bonelli, and Southern Grey Shrike Lanius meridionalis. Also included are breeding data, data on the occurrence of migrant visitors as well as data on some rare and threatened resident taxa.
8 citations
Related Topics (5)
Performance Metrics
| Year | Papers |
|---|---|
| 2019 | 2 |
| 2017 | 1 |
| 2016 | 2 |
| 2015 | 2 |
| 2011 | 1 |
| 2008 | 1 |