An Evaluation of Morphological Methods for Sex Determination of Black Skimmers (Rynchops niger) in the Pre-Fledgling Stage
Carly Naundorff,
Elizabeth A. Forys
Abstract:Black Skimmers (Rynchops niger) are sexually monochromatic seabirds that are dimorphic in size. Although most dimorphic seabird adults can be accurately sexed using non-invasive techniques, determining the sex of pre-fledglings is more challenging. Schew and Collins (1990) developed an equation to estimate chick age from wing chord and used body mass of chicks ≥ 24 days old to evaluate the sex of skimmers in California; however, this was not verified on known-sexed individuals. Our objective was to assess the … Show more
“…Butler et al (2023) show that considerable effort is needed to determine robust occupancy of Black Rails ( Laterallus jamaicensis jamaicensis ), while also underscoring the importance of vegetation and time of count in improving ability to detect the species. In another methodology paper, Naundorff and Forys (2023) revisit an established equation developed in California to estimate Black Skimmer ( Rynchops niger ) chick age using morphometric measures and find that the equation performed poorly on skimmer chicks measured in Florida. Such studies are relatively simple to undertake and can yield important findings regarding location-specific morphometrics of waterbirds.…”
“…Butler et al (2023) show that considerable effort is needed to determine robust occupancy of Black Rails ( Laterallus jamaicensis jamaicensis ), while also underscoring the importance of vegetation and time of count in improving ability to detect the species. In another methodology paper, Naundorff and Forys (2023) revisit an established equation developed in California to estimate Black Skimmer ( Rynchops niger ) chick age using morphometric measures and find that the equation performed poorly on skimmer chicks measured in Florida. Such studies are relatively simple to undertake and can yield important findings regarding location-specific morphometrics of waterbirds.…”
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