Contemporary Hen Species Showcase in Brazil

A multi-persona systematic glimpse led by the Universidade Federal end Pará exhibits that what ornithologists know because the silvery-cheeked antshrike (Sakesphoroides cristatus) in actuality portray two species in wish to at least one.

Illustration of Sakesphoroides niedeguidonae. Image credit rating: Eduardo Brettas.

Illustration of Sakesphoroides niedeguidonae. Image credit rating: Eduardo Brettas.

The newly-found species, the northern silvery-cheeked antshrike (Sakesphoroides niedeguidonae), is endemic to the Caatinga, a natural situation that lies within the hinterland of northeastern Brazil.

“The Caatinga is the major patch of seasonal dry tropical woodland within the Neotropics, situated in northeastern Brazil and characterised basically by deciduous vegetation and erroneous rainfall seasonality,” stated Dr. Pablo Cerqueira from the Museu Paraense Emílio Goeldi at the Universidade Federal end Pará and his colleagues.

“It has traditionally been handled as a biologically impoverished domain, however most modern research uncovered contemporary diversification patterns and plenty of different contemporary species of frogs, mammals, bugs, and fishes.”

“The geomorphology of this case performs a most basic role in its biogeographic history, with altitudes starting from sea level within the north, an moderate 400-700 m by Bahia and Minas Gerais states within the central fragment, to over 1,000 m on the slopes of the Espinhaço vary.”

Sakesphoroides niedeguidonae is simplest the 2d species known within the genus Sakesphoroides, which also comprises Sakesphoroides cristatus.

“Till currently, Sakesphoroides cristatus became as soon as positioned within the genus Sakesphorus, however novel genetic and morphological info recovered it as non-monophyletic, prompting the transfer to the separate genus Sakesphoroides,” the researchers stated.

In the glimpse, they examined a total of 1,079 Sakesphoroides cristatus specimens (818 males, 261 females).

To study song variation, they analyzed a total of 115 varied sound recordings.

To boot they sequenced 58 tissue samples from all over Sakesphoroides cristatus vary, 39 of them belonging to the left monetary institution and 19 to the staunch monetary institution of the São Francisco River.

Of the 1,079 folk (skins and photographs) analyzed, they could per chance perchance per chance not title any diagnostic plumage variations among males, however two predominant plumage patterns in females had been identified mostly across the river.

“Males of Sakesphoroides niedeguidonae are identical in plumage to Sakesphoroides cristatus, however females vary from the faded by certain crown, reduction, and tail colors,” the scientists stated.

Sakesphoroides niedeguidonae has an overall lighter (amber) color in wish to chestnut as Sakesphoroides cristatus.”

“The aid is olive brown in Sakesphoroides niedeguidonae, whereas that of Sakesphoroides cristatus is cinnamon-brown.”

“The total tail color in Sakesphoroides niedeguidonae is darker than in Sakesphoroides cristatus, with the most conspicuous difference being the murky and white barring, replaced in Sakesphoroides cristatus simplest by discreet silly brown and rufous bars and total absence of white barring.”

“The loudsong of Sakesphoroides niedeguidonae is a microscopic identical in frequent sample to that of Sakesphoroides cristatus, however differs conspicuously by the shape of the first notes,” they added.

“The contemporary species is practically restricted to the left/northern monetary institution of the São Francisco River, with one population occurring on the staunch monetary institution at ‘Raso da Catarina’ situation in Bahia convey.”

“This population found on the staunch/southern monetary institution of the São Francisco River could per chance perchance perchance had been ‘transferred’ across the river due to paleocourse shifts, as discussed in detail beneath in discussion portion.”

Sakesphoroides niedeguidonae is a frequent species in most of its distribution, occurring in varied habitats within the Caatinga, alongside with secondary development vegetations.

“The extent of occurrence is estimated at 630,000 km2, not drawing advance the threshold for a Susceptible space beneath the IUCN vary size criterion (much less than 20,000 km2),” the authors stated.

“Though no info on population size are available, we query a quantity greater than 10,000 used folk, so this species is most efficient positioned as Least Bother.”

“Then as soon as more, contemporary approaches the usage of enviornment of interest modeling for future native weather scenarios improve a most basic discount in vary size of Sakesphoroides cristatus (alongside with Sakesphoroides niedeguidonae, as handled sooner than this glimpse).”

“Applying IUCN standards to those future estimated vary sizes can alternate its risk category to Cease to Threatened and even Susceptible relying of the future world alternate worry.”

The invention of Sakesphoroides niedeguidonae is reported in a paper within the journal Zoologica Scripta.

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Pablo Cerqueira et al. A contemporary antshrike (Aves: Thamnophilidae) endemic to the Caatinga and the role of native weather oscillations and drainage shift in shaping cryptic vary of Neotropical seasonal dry forests. Zoologica Scripta, published online June 17, 2024; doi: 10.1111/zsc.12672