Birder's Guide

OCT 2017

Birder's Guide is the American Birding Association's newest publication. Each issue focuses on a key subject, providing tips from experienced birders on a wide variety of topics like Travel, Listing & Taxonomy, Gear, and Conservation & Community.

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Page 34 of 51

n Rose-ringed Parakeets, Foster Gardens, Oahu, 24 January 2008. Although this species has been accepted to the American Ornithological Society's (AOS, formerly AOU) Check-list based on populations in Florida, it has only recently been added to the ABA Checklist based on established populations in Hawaii. Photo © Jack Jeffrey 33 October 2017 | Birder's Guide to Listing & Taxonomy utive years of breeding and population stability or increase (AOU 1998: xiii). Prior to publication of the previous ABA Checklist, the ABA decided to add more criteria to presume a population was established (Pranty et al. 2008: 11-16), thereby making acceptance to the ABA Checklist more stringent. This change was based, in part, on previ- ously accepted exotic species that had since become extirpated in the ABA Area (such as Black Francolin, Crested Myna, and Blue-gray Tanager) and the desire not to add and then remove such spe- cies in the future. However, even with the more-stringent criteria, at least one species, Budgerigar, took the same jour- ney on and then off the ABA Checklist. These species are now listed in an Ap- pendix to the ABA Checklist (Pranty et al. 2008:183-184). The result of this is that there may be exotic species that are accepted to the HBRC or AOS checklists that are not or may not be accepted to the ABA Check- list. Even before our Hawaii-only review, there were a couple of species like this: Rose-ringed Parakeet, accepted by the AOS based on populations in southern Florida, and Mitred Parakeet, accepted by the AOS based on populations in California, that were not on the ABA Checklist (see Pranty and Garrett 2011 for a full discussion of these and other borderline cases). Rose-ringed Parakeet was one of the 98 species now accepted to the ABA Checklist by the ABA-CLC based on populations in Hawaii, where- as Mitred Parakeet was recently rejected based solely on populations in Hawaii. Are Rose-ringed Parakeet popula- tions in southern Florida and Califor- nia's Central Valley established and/ or countable? The ABA-CLC does not take a position on this. According to the ABA-RSEC's rules, any individual of a species is countable across the entirety of the ABA Area, as long as it has been accepted to the ABA Checklist and the observer believes it originated from an established population. (For more on this topic, see Nick Block's article in the 2016 issue of Birder's Guide to Listing & Taxonomy.) So what about the Mitred Parakeet population in California, ac- cepted as established by the AOS? The ABA-CLC may or may not take up this question but would prefer the CBRC to first consider the species as established there before doing so. One final bit of business for the Ha- waii-only review will be to decide if any Hawaii-only species should be added to the ABA appendix of exotic species that were established at one time but have since become extirpated. The HBRC ac- cepts two such species to the Hawaiian Islands Checklist: Varied Tit and Pale-

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