Does The Featherless Throat Colour Variation Affect The Mating Rate And The Number Of Females Attracted By The Male

Does The Featherless Throat Colour Variation Affect The Mating Rate And The Number Of Females Attracted By The Male

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Does the featherless throat colour variation affect the mating rate and the number of females attracted by the male tyrant Alectrurus risora?
Strange-tailed Tyrants (Alectrurus risora) are threatened and vulnerable species that inhabit in wet and subtropical grassland. Due to the dramatic drop in the population, currently, they only occur in south Paraguay and north Argentina (Giacomo and Giacomo 2004). Adult male has a black feather colour for head and a long tail that is two times the body length, a grey wing colour and a white belly. Similar to many other species, female is sexually dimorphic that has a shorter tail, and the feather appears in the colour light brown comparing to the male (Lowen et al. 2008). Different from many other birds, Giacomo brothers and Reboreda (2011) discovered that 80% of the males are polygynous, which means that the male can have more than one mate, but females can only have one mate choice. Therefore, males have to be attractive to female in order to win their attention to breeding. During the breeding season, the male’s white feather that covers the throat falls off and the bare red skin is apparent (Di Giacomo et al. 2011). Considering the species that is in the same order group with Strange-tailed Tyrant, the male Luscinia svecica spends more time on singing than guarding their mates because they are more sexually attractive to an extra-pair mate as they have a blue and chestnut throat (Johnsen et al. 1997). The connection between colour and male’s responsibility in guarding its mate for Luscinia svecica leads me to question the correlation between the throat colour and attractiveness for Strange-tailed tyrant. So I am interested in investigating how does colour variation wou...

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...h (1996), they concluded that there is not a significant correlation in how beak colour affects the female Zebra finch’s preference when choosing their mate because colour variation may only be a factor for females to differentiation female and male from a far distance. Consequently, colour variation only allows the female Zebra finches to be more efficient when they are finding a mate to breed; however, it plays a minor role in making the male more attractive to a number of females that affects the mating rate.
On the other hand, my hypothesis is the colour variation does affect the mating rate for male Strange-tailed Tyrant. This is because research on another bird species has found that female peacock has a preference to mate with the male that has a more complex arrangement of eye spot and an elaborate train.
If the result rejects the null hypothesis

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