Tyrannides (1 Viewer)

[Xenospiza]

Attached is an ID tree from BOLD which has 51 Camptostoma samples (although I'm not sure there is any caucae among them).
Samples from Panama and (eastern) Colombia are in the same cluster, thus cox1 probably doesn't differ between pusillum and flaviventre.
napaeum and obsoletum seem to differ, but the distance between them is moderate (~ 1.3%).
Beside this, the groups are quite distinct, with distances between them around 5 to 7%.

Indeed, no caucae. In addition, on distribution the Bahia samples should be obsoletum, not napaeum.
The sample from Meta could be napaeum or pusillum (so probably the latter based on DNA).

So I guess, a more conservative approach, stealing James's list, taking in Snapdragyn's complaints an adding the sample numbers from Laurent's tree:

Camptostoma imberbe P. Sclater, 1857. Mexican Beardless Tyrannulet (48-50).
Camptostoma thyellophilum Parkes & Phillips, 1999. Yucatán Beardless Tyrannulet (51-57).
Camptostoma pusillum (Cabanis & Heine, 1859.) Venezuelan Beardless Tyrannulet (45-47);
(or Caribbean? I cannot think of a good name for "northern South America including Panama").
- incl Camptostoma flaviventre P. Sclater & Salvin, 1864. Panama Beardless Tyrannulet (40-44, not differentiated genetically).
(?) Camptostoma caucae Chapman, 1914. Cauca Beardless Tyrannulet. Needs more work (no sample).
Camptostoma obsoletum (Temminck, 1824.) Brazilian Beardless Tyrannulet (23-34).
- incl Camptostoma napaeum (Ridgway, 1888.) Amazonian Beardless Tyrannulet (35-39, slight genetic differentiation and broad hybridisation).
Camptostoma sclateri (von Berlepsch & Taczanowski, 1883.) Pacific Beardless Tyrannulet (58-67).
(If someone has listened to the calls and noted a quality that can be used to differentiate it by name, that would be better than yet another boring geographic feature).

 

[Jim LeNomenclatoriste]

Camptostoma imberbe P. Sclater, 1857. Mexican Beardless Tyrannulet.
Camptostoma thyellophilum Parkes & Phillips, 1999. Yucatán Beardless Tyrannulet.
Camptostoma pusillum (Cabanis & Heine, 1859.) Venezuelan Beardless Tyrannulet
(or Caribbean? I cannot think of a good name for "northern South America including Panama").
- incl Camptostoma flaviventre P. Sclater & Salvin, 1864. Panama Beardless Tyrannulet (not differentiated genetically).
(?) Camptostoma caucae Chapman, 1914. Cauca Beardless Tyrannulet. Needs more work.
Camptostoma obsoletum (Temminck, 1824.) Brazilian Beardless Tyrannulet.
- incl Camptostoma napaeum (Ridgway, 1888.) Amazonian Beardless Tyrannulet (slight genetic differentiation and broad hybridisation).
Camptostoma sclateri (von Berlepsch & Taczanowski, 1883.) Pacific Beardless Tyrannulet.
(If someone has listened to the calls and noted a quality that can be used to differentiate it by name, that would be better than yet another boring geographic feature).

Can you tell which taxon corresponds to which branch in Laurent's figure?

 

[Xenospiza]

Can you tell which taxon corresponds to which branch in Laurent's figure?

I've now added the sample numbers.

 

[Jim LeNomenclatoriste]

I've now added the sample numbers.

Thanks. Where would olivaceum be?

 

[Xenospiza]

Thanks. Where would olivaceum be?

No samples from western Amazonia, so unknown... but it was lumped with napaeum in the article based on vocalisation.

 

[Peter Kovalik]

Proposal (1039) to SACC

Split Camptostoma obsoletum into six species

 

[albertonykus]

Mendonça, P., L.S. Carneiro, V. Leandro-Silva, A. Aleixo, J. Araripe, and P.S. Rêgo (2025)
The influence of the forest corridors to the north of the Andes on the diversification of the bright-rumped Attila, Attila spadiceus (Passeriformes, Tyrannidae), during the climatic oscillations of the middle Pleistocene
Ecology and Evolution 15: e70331
doi: 10.1002/ece3.70331

This study aims to enhance our understanding of the temporal and spatial processes scales governing the evolutionary diversification of Neotropical birds with Trans- and Cis-Andean populations of the species Attila spadiceus from South and Central America. Through a multilocus analysis of the mitochondrial (CytB and ND2) and nuclear genes (I7BF, I5BF, and G3PDH) of 41 samples representing six subspecies, we describe the existing molecular lineages of A. spadiceus, and estimate their demographic dynamics. We used Ecological Niche Modeling (ENM) with six different algorithms to predict the potential distribution of A. spadiceus in both present-day and past scenarios, examining the overlap climatic niche between Cis- and Trans-Andean lineages. The analysis confirms a relatively recent divergence of the Trans- and Cis-Andean lineages, at approximately 0.25 million years ago (Ma). The niche modeling supports the existence of a dynamic scenario of the expansion and retraction of forest corridors in northwestern South America during the last glaciation. This suggests that the earlier orogenesis of the Andes was not a primary determinant of this dichotomy. Additionally, the analysis of population dynamics indicated a trend of increasing population size starting at 0.05 Ma for both lineages. Our findings highlight the significance of Pleistocene Forest corridors north of the Andes as the key factor maintaining communication before the separation of the lineages, likely associated with the retraction of this forest. We highlight the absence of any significant differentiation between the disjunct Amazonian and Atlantic Forest populations, at both part of the Cis-Andean lineage. The phylogeographic profile of A. spadiceus diverges from the patterns observed in other Neotropical birds, which emphasizes the need for further research on the role of the forest corridors of the northern Andes as drivers of diversification, to provide comprehensive insights into the processes that led to the formation of the region's present-day avian diversity.

 

[Xenospiza]

Proposal (1039) to SACC

Split Camptostoma obsoletum into six species

Situation in Colombia unclear, so I am guessing a NO is looming...

 

[Paul Clapham]

Situation in Colombia unclear, so I am guessing a NO is looming...

The proposal provides a menu with 5 items, so committee members could say YES to any subset of that menu. It could take a while to get agreement on a final subset.

 

[Peter Kovalik]

Manthey, J.D., and Robbins, M.B. (2025) Hybridization and genome-wide introgression in sympatric populations of North American wood-pewees (Contopus sordidulus and Contopus virens). Ibis, posted online 28 February 2025
https://doi.org/10.1111/ibi.13401

Abstract
The Great Plains contains many contact zones between eastern and western North American bird species. In these contact zones, closely related lineages or species vary widely in both the geographical and the genomic extent of their hybridization. Two phenotypically similar sister species of flycatchers – the Eastern Wood-Pewee Contopus virens and the Western Wood-Pewee Contopus sordidulus – have sparse geographical overlap in the Great Plains, including a few isolated planted forest stands and along forested riparian corridors of the Niobrara and Platte rivers in central Nebraska, USA. Our previous genetic work found low levels of genetic differentiation between these two flycatcher species, along with several putatively admixed individuals in this zone of sympatry in Nebraska. Here, we used whole-genome sequencing to confirm the presence of admixed individuals and quantify nonrandom gene flow, both in direction between taxa and location in the genome. We confirm the presence of both early-generation hybrids and highly backcrossed individuals in this contact zone. We found moderate levels of genetic differentiation between the two species, with the highest differentiation on the Z chromosome. In addition, all individuals in sympatry contained at least some minor parental genomic ancestry, suggestive of bidirectional introgression. There was evidence of introgression in sympatric individuals across the entire genome, except for approximately half the Z chromosome, suggesting that there is some selection and resistance to admixture in this genomic region.