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The paper entitled “Phylogenetic and morphologic evidence confirm the presence of a new montane cloud forest associated bird species in Mexico, the Mountain Elaenia (Elaenia frantzii; Aves: Passeriformes: Tyrannidae)” is interesting, straightforward, well written and deserves to be published in the PeerJ.
In particular, I value that the authors used different sources of evidence for their record.
The authors collected two birds and compared with other museum skins confirming morphologically the identity of the species. They also sequenced the mtDNA and show the position of the samples in the molecular phylogeny showing that they are grouped within the clade E. frantzii. Finally, they modelled the potential habitat that the species could occupy showing that the environment of the new record where the birds were collected is suitable for the presence of the species. So there is no doubt that the records are scientifically valid and belong to the species Elaenia frantzii.
One thing I think is needed is to add in the map the northernmost record of E. frantzii (the audio recording from northeastern, Utah, USA, deposited in VertNet), even if it is a non-breeding population; also, its biogeographical importance should be briefly discussed.
Line 39 ….”open humid”....
What do you mean by open humid forest? Please give more detailed characterization of this vegetation type.
Please cite Figure 3
Information about authorizations to collect and to do field work should go on the ACKS.
Provide full name of the institutions, followed by the acronyms.
Line 160 ….
The record of E. frantzii in the USA should be added in the map and its biogeographical importance discussed.
after “90.3913987°W, WGS84, Cobán, Departamento Alta Verapaz, Guatemala (Cahill, 2013)” cite Figure 3.
The authors invested a lot of effort to prove that the range of Elaenia frantzii extends as far north as southern Mexico. The technical work has been performed according to standard and the paper is well written.
33: New World flycatcher
52 tyrant flycatcher
64-72 remove parentheses from taxon authors as all taxa were described in Elaenia, add author for ultima
113 and more often: separate "°C" from preceding number by blank
130 see 44
140, 146, 148: use command citation() in R for correct referencing of the software (packages)
152 ten model replicates
164 vs. 168: use consistent format for coordinates, I recommend "d° m' s" W"
188 cf. 113
205 ten replicates
fig2: do not italicize "New record"
fig3: italicize "Elaenia frantzii"
tab1: round values to 2 or 3 decimal places only
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