March 08, The ability to determine sex in loggerhead shrike has given us another tool to help understand what is causing the decline and how conservation breeding can best help offset the threats. The plumage of loggerhead shrike is sexually monomorphic so birds can not be reliably sexed in hand, using physical characteristics as in the case for many other species. DNA sexing is possible but is expensive, time delayed and requires special equipment. Our simple method is easy and quickly undertaken, with results indicating a high accuracy rate, that increases with a small amount of training. However, the pattern varies amongst individuals. The most difficult part of our method is deciding how far the brown in the rachis extends through the white and only going on to additional steps if the sex cannot be determined based on this characteristic alone. Feel free to contact us and we can provide sample photos used in our citizen science survey. Begin by firmly holding the bird using How To Have Sex Visual banders grip and carefully extending one wing to allow the sixth primary feather to be viewed, making sure to not overextend the wing. Locate the P6 feather by counting forward from the first primary. Assess the brown in the rachis and determine if it extends at least halfway through the white and touches the distal end of the primary covert feathers. If it does, the bird is female. If unsure of the sex, based on the color of the rachis, assess the symmetry of the brown to white transition on each side of the shaft. If the brown meets at the same spot on either side of the shaft, the bird is male. If the line meets asymmetrically at the shaft, creating a step or notch, the bird is a female. If there is still uncertainty, examine the angle of the transition between the brown and the white coloration. If the brown has a steep angle where it meets the white, forming an upside down V, the bird is a female. If the pattern looks more like an M, the bird is male. This sexing protocol was tested on participants, who read a brief instruction on how to sex using feather patterns and then attempted to sex a series of 26 shrikes based on a photograph. Most participants ranked themselves as having little or no experience with birds. Ten volunteers received in person training on this method and attempted to sex the same series of How To Have Sex Visual photos which they had not seen before. The individuals trained one on one, correctly assessed 12 out of 13 photos of females and 11 out of 13 photos of males. When attempting this method, the most critical step is determining how far the brown in the rachis extends through the white, only if there is question about whether or not the brown touches the primary coverts, should the observer continue on to assess other characteristics. For captive birds, sexing can coincide with the need to handle birds for vaccination, banding or other routine management. To date, more than young birds have been released into the wilds of Ontario. A rapid and inexpensive method for sexing young birds makes it possible to quantify how many birds of each sex are released and if sex biased mortality is occurring. We present a protocol to characterize the sex of loggerhead shrike visually based on the coloration and pattern of the sixth primary wing feather. Morgan, G. JoVE Journal Biyoloji. Bu içeriği görüntülemek için JoVE aboneliği gereklidir. Oturum açın veya ücretsiz deneme sürümünü başlatın. Gareth Morgan 1Amy A. Chabot 1,2. Automatically generated. Explore More Videos. Read Article.
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