Wednesday, December 24, 2008
(The Black-Throated Gray Warbler in the above photo is one of five species within the Black-Throated Green superspecies group.)
Thanks for the query, Ms. Jones (in Santa Barbara, CA).
Think of a superspecies as a group of related species that evolved from a common ancestor, but live in distinct ranges apart from each other. A good example of a superspecies is the Black-Throated Green Warbler group that includes this species as well as Townsend’s, Hermit, Golden-Cheeked, and Black-Throated Gray Warblers.
Each of the latter four species in the above group is thought to have evolved from its Black-Throated Green ancestor. As this species expanded from its southeastern USA deciduous forest territory into coniferous forest created by the most recent glacial advances, isolation occurred among populations. As generations of separated populations slowly spread west and north throughout lower North America, each population became a divergent “island.” Gene flow ceased as reproductive isolation caused speciation to occur over eons. The resulting five species share various field marks, but also express their own unique characteristics.
Nonetheless, despite their status as species, hybridization sometimes occurs among species within a superspecies, including the Black-Throated Green superspecies wherein populations of Townsend’s and Hermit hybridize in Oregon and Washington. To simplify, where both species occur, over time Townsend’s appear to usually dominate and increase in number.
More technical, the five species within the Black-Throated Green superspecies have parapatric distributions. That is to say, each of the five species has ranges that do not significantly overlap but are immediately adjacent to each other (and/or occur together in a narrow contact zone, with the aforementioned reference to Townsend’s and Hermit Warbler hybridization a scenario where overlapping occurs).
To learn more about this subject, read a classic article by R.M. Mengel titled “The probable history of species formation in some northern wood warblers.” One source where this article appears is in a 1964 edition of “Living Bird” (page 943).
Wednesday, December 17, 2008
Thanks for the question Lori Anne (in Seattle).
Although many eminent, well-respected authors suggest, for example, a California sighting of American Redstart deserves a “vagrant” status designation*, I beg to differ.
(* = vagrant status applies to a bird species that is found far from its typical breeding or non-breeding area.)
That’s because my research suggests small populations of this species periodically to annually nest in small numbers in n.w. CA. In addition, other breeding range individuals occur as far west as s.w. Idaho, Oregon, and Washington.
As a result, I believe it’s more appropriate to refer to autumn and winter sightings of this species in northern California as “casual visitors.” That term qualifies a bird species’ status as one that is slightly removed geographically from where it is expected to be seen in either breeding or non-breeding range.
Ultimately, it’s possible a Bay Area (e.g., Point Reyes National Seashore) sighting of this species could be an individual that spent the breeding season in farther north latitudes, such as the aforementioned n.w. CA area (or Alaska, more probably, where populations in greater abundance breed).
In any event, the entire species of American Redstart are thought to be locally abundant in much of their breeding range, especially if suitable habitat remains. However, it should be noted that populations have declined where forests have been fragmented by development and where urbanization has replaced habitat.