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Bird Taxonomy and Nomenclature
Harlan's Hawk
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<blockquote data-quote="l_raty" data-source="post: 1387564" data-attributes="member: 24811"><p>It certainly will be interesting to see how things turn out, but... I'm not sure that identifying a taxon as "unique for the extreme amount of variation it shows" is a very good starting point to split it... <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite2" alt=";)" title="Wink ;)" loading="lazy" data-shortname=";)" /></p><p>Note that the taxonomic issues with Harlan's Hawk don't end with the "species vs. not-a-species" question. The dark <em>harlani</em> phenotype has also been regarded a color morph in the past, thus we arguably also might have a "subspecies vs. not-a-valid-taxon" question.</p><p></p><p>Riesing et al. (2003 - <a href="http://www.bird.at/fileadmin/user_upload/Redaktion/pdf/buteophyl.pdf" target="_blank">http://www.bird.at/fileadmin/user_upload/Redaktion/pdf/buteophyl.pdf</a>) found two clades of mtDNA in <em>B. jamaicensis</em>.</p><p>One was present in samples from Jamaica (<em>jamaicensis</em>) and eastern N America (<em>borealis</em>), as well as in a <em>harlani</em> (taken in N Dakota, though - thus outside the breeding range of the ssp).</p><p>The other was present in samples from western N America (<em>calurus</em>) and Mesoamerica (<em>costaricensis</em>), but also in a <em>borealis</em> from New Jersey. (This second clade is also what they found in the two South-American Rufous-tailed Hawks <em>B. ventralis</em> they sampled.)</p><p>This is suggestive of an east+north vs. west pattern of differentiation - quite classical in N American birds - but the sample sizes are really small, and more data would be necessary to confirm this.</p><p></p><p>Alternatively, if N America was colonized following two distinct pathways (one from a Caribbean refugium, through eastern, then northern N America, the other from a Mesoamerican refugium, through western N America), it may be conceivable that these could both have ended, and met, in the range of <em>harlani</em>. Thus if <em>harlani</em> is so variable, what about it being something like a <em>krideri</em>-<em>calurus</em> intergrade/hybrid swarm?</p><p></p><p>L -</p></blockquote><p></p>
[QUOTE="l_raty, post: 1387564, member: 24811"] It certainly will be interesting to see how things turn out, but... I'm not sure that identifying a taxon as "unique for the extreme amount of variation it shows" is a very good starting point to split it... ;) Note that the taxonomic issues with Harlan's Hawk don't end with the "species vs. not-a-species" question. The dark [I]harlani[/I] phenotype has also been regarded a color morph in the past, thus we arguably also might have a "subspecies vs. not-a-valid-taxon" question. Riesing et al. (2003 - [url]http://www.bird.at/fileadmin/user_upload/Redaktion/pdf/buteophyl.pdf[/url]) found two clades of mtDNA in [I]B. jamaicensis[/I]. One was present in samples from Jamaica ([I]jamaicensis[/I]) and eastern N America ([I]borealis[/I]), as well as in a [I]harlani[/I] (taken in N Dakota, though - thus outside the breeding range of the ssp). The other was present in samples from western N America ([I]calurus[/I]) and Mesoamerica ([I]costaricensis[/I]), but also in a [I]borealis[/I] from New Jersey. (This second clade is also what they found in the two South-American Rufous-tailed Hawks [I]B. ventralis[/I] they sampled.) This is suggestive of an east+north vs. west pattern of differentiation - quite classical in N American birds - but the sample sizes are really small, and more data would be necessary to confirm this. Alternatively, if N America was colonized following two distinct pathways (one from a Caribbean refugium, through eastern, then northern N America, the other from a Mesoamerican refugium, through western N America), it may be conceivable that these could both have ended, and met, in the range of [I]harlani[/I]. Thus if [I]harlani[/I] is so variable, what about it being something like a [I]krideri[/I]-[I]calurus[/I] intergrade/hybrid swarm? L - [/QUOTE]
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Harlan's Hawk
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