Intergeneric Hybridization of a Vagrant Common Black Hawk and a Red-Shouldered Hawk

Moore, Stan Gerald; Coulson, Jennifer O.

doi:10.3356/0892-1016-54.1.74

Cited by 3 publications

(1 citation statement)

References 16 publications

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“…There are many cases of birds from different genera producing hybrid young (Price and Bouvier 2002). Moreover, vagrant birds settling in an area with no potential conspecific mates might be particularly likely to hybridize (Hubbs’ principle) (Hubbs 1955; Randler 2002; Moore and Coulson 2020). In our view, attempting to filter eBird databases to include only those species that researchers decide might hybridize and restricting observations to regions where published ranges overlap will tend to yield an artificially high hybridization rate.…”

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A response to estimating hybridization in the wild using community science data: A path forward

2022

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When working with a citizen science database like eBird, there are many possible ways to filter or subsample observations. Here, we discuss the potential biases and assumptions that surround different subsampling approaches or filtering that can be done to the eBird database. Restricting observations to species that are known to frequently hybridize, a specific time of the year, or a specific location, has the potential to greatly inflate the calculated per‐individual rate of hybridization. Such filtering also assumes that researchers know a birds’ capacity to hybridize with all other species in its range, which we argue is an unfounded assumption. We ultimately conclude that a limited filtering approach is ideal when using a citizen science database to attempt to address a broad question such as: what is the per individual rate of hybridization across all of the bird species in the United States?

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confidence: 99%

A response to estimating hybridization in the wild using community science data: A path forward

2022

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Strange Tunes—Acoustic Variation and Character Displacement in a Tarsier Hybrid Zone

Bohr

Purbatrapsila

Perwitasari-Farajallah

et al. 2023

Int J Primatol

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Natural hybridization provides valuable insights into evolutionary processes, such as speciation and the forces driving or hindering it. Sulawesi tarsiers Tarsius dentatus and T. lariang hybridize within a limited area, suggesting selection against hybrids. Their species- and sex-specific duet songs might serve as a premating barrier in sympatry, especially if differences are strengthened by character displacement. Individuals of mixed origin might face disadvantages if they inherit intermediate song traits. To shed light on the processes shaping this hybrid zone, we analysed 55 duet songs from within and outside the zone. For females and males, we identified temporal and frequency-related parameters that differ between species. We inspected hybrid songs for intermediate characteristics and analysed purebred songs for character displacement in sympatry. Female hybrid songs (N = 2) were intermediate in four to five of six parameters; interpretation of male hybrid songs (N = 2) was inconclusive, because only two parameters were reliably quantifiable. There was no character displacement in female songs in sympatry (N = 11) compared with monospecific areas (N = 17). In male songs, interspecific differences in note rate were significantly larger within the hybrid zone (N = 8) compared with outside (N = 13). Intermediate song traits indicate inheritance and may disadvantage hybrids during mate choice. Character displacement in male songs is consistent with female mate choice, because females should opt for unmistakable signals to avoid costly hybridization. Our findings thus suggest that duet songs of T. lariang and T. dentatus play an important role in limiting this hybrid zone.

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Common Black Hawk (Buteogallus anthracinus)

Johnson,

Schnell

2024

Birds of the World

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Intergeneric Hybridization of a Vagrant Common Black Hawk and a Red-Shouldered Hawk

Abstract: BioOne Complete (complete.BioOne.org) is a full-text database of 200 subscribed and open-access titles in the biological, ecological, and environmental sciences published by nonprofit societies, associations, museums, institutions, and presses.

Cited by 3 publications

References 16 publications

A response to estimating hybridization in the wild using community science data: A path forward

A response to estimating hybridization in the wild using community science data: A path forward

Strange Tunes—Acoustic Variation and Character Displacement in a Tarsier Hybrid Zone

Common Black Hawk (Buteogallus anthracinus)

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