Is Sexual Selection Within Male Pharomachrus Mocinno Favoured By Longer Plume Tail Length

One of its most important characteristics is its beak. The finch adapted to have a thin, long beak to probe through moss, bark and leaves in search of food (Wildscreen Arkive, N.D.). These finches have the thinnest beak out of the 13 finches; which aids them to find small insects. The Green Warbler finch are mostly found in humid highland forest where their primary food source is found. These adaptations made them more fit to survive on available food. Over the years the finch’s beak has evolved as the bird developed different taste for insects. Another famous adaptation is how they camouflage in their environment. The Green Warbler is restricted to the forest and is greener in body colouration, while the Gray Warbler is found in shrubby, dry thickets and is greyer and duller looking (Certhidea olivacea, 2010). Their coloration helps them camouflage in their own environments, and to hide from predators. Recent studies have found that there are in fact two separate species of the Warbler Finch, the Green Warbler Finch and the Grey Warbler Finch, but are considered as a single species (Wildscreen Arkive, N.D.). The Green Warbler finch mainly occupies larger, inner islands, while the Grey Warbler finch inhabits the smaller, outer islands (Green Warbler Finch,

Over the years, the male population of the blue moon butterfly has increased to nearly forty percent and this is all due to evolution. (Sherriff 2007).

If this research continued on, this study can test various lengths of hindwing tails in separate evolutionary counter events in

Sexual sections is one of the processes of natural selection in which there is a competition for sexual reproduction, these competitions can be classified as intersexual or intrasexual. Intersexual competition occurs when one organism, usually female, chooses its partner. Intrasexual competition, on the other hand, happens when species from the same gender compete to sexually reproduce.

This study consisted of two experiments, in the first experiment they determined that the symmetry of the front legs of males was related to their rate of leg raises, this was used as a measure of male quality. They used this measure in the second experiment when they explored how Tigrosa helluo predator cues changed the males’ courtship behaviour. It was determined that predation cues did not have an effect on whether mating happened between males and females and a

The female ocellated wrasse (Symphodus ocellatus) prefer to mate with nesting males over sneaker males due to better parental care by nesting males (Alonzo 2008). Since S. ocellatus reproduces by external fertilization, once the female drops her eggs for the nesting male to reproduce, the sneaker males have the opportunity to spread their seed as well. Sneaker males are known to throw out more seed compared to the nesting males, but the female cannot stop mating with sneakers (Alonzo 2000). Females with internal fertilization have a cryptic (post-mating spermatic choice in the reproductive tract) mechanism, which is governed by the presence of ovarian fluid (Rosengrave 2008). The researchers wondered whether this cryptic choice was also seen

A recent trend in ornithology research has been to better understand how birds chose their mates through behavioral displays. This topic has been of interests among the birding community due to the fact that it reveals the social structure of bird groups and demonstrates the role of choice in selecting partners. One way for females to select their copulation partners is through eavesdropping on male-male vocal interactions as a way for females to compare different males’ singing behavior and make direct comparisons between males on the basis of their performance. In order to better understand the role eavesdropping had on partner selection among black-capped chickadees the Mennill et al team set out to find out if female black-capped chickadees base their reproductive decisions on information gained through eavesdropping.

The species are classified as polymorphic because of the vast colouration and size difference between the sexes. The colouration enables the species to camouflage within their ecosystem to aid their survival and maintain nourishment. Barns owls are predominantly sexed by their size and the colouration of feathers for instances males are usually smaller, paler and have a slightly smaller wingspan. Figure 2 illustrates the colouration and size difference within females located in different regions, although both have colour preferences regarding their ecosystem it is beneficial for their

Just less than 64-100 years after its discovery by Europeans, the Dodo bird vanished completely from existence. Unsurprisingly, this bird has gained the image of a creature that was poorly adapted. The bulk of the arguments used to support this widespread belief are that Dodos were flightless and fearless as well as supposedly being fat, stupid, clumsy, and slow. Although these features are seen as disadvantages, they were actually evolutionary adaptations or are myths. Ultimately, we can not say the Dodo bird was as poorly adapted as we thought.

Dietary and environmental factors play a key role in many aspects of life, whether human or animal. This paper will discuss the many dietary and environmental factors that affect the sexual selection as well as sexual dimorphism, specifically in lizards. Sexual selection is a type of natural selection where one sex does the choosing of mates for the other sex, and members of the same sex are rooted against each other to compete for mates. In order for a mate to attract a female with a high reproductive fitness, it is important to do a little showing off, and this is where sexual dimorphism comes in. Sexual dimorphism is the differences between two sexes of the same species. There are many ways in which lizards can exhibit sexual dimorphism,

Till today, it is unknown why females of many species mate with multiple males when mating has been proven to be costly and a single copulation more times than not, proved to be enough to fertilize all of a female’s eggs. In this experiment, researchers are looking into this trend by examining the driving forces behind the origin and maintenance of polyandry in female Drosophila pseudoobscura by analyzing the cost and benefits of direct fitness of the fly’s offspring. It is believed that polyandry may benefit females by increasing the fitness of their offspring, allowing females to take control of paternity throughout sperm competition, and creating a correlation between male fitness and sperm competitive ability which is ultimately reinforced

According to Clive K. Catchpole, studies on song function have demonstrated that Sexual Selection in Acrocephalus Warblers was used for sexual attraction. Furthermore, it was confirmed that after settling with a mate, the singing ceased and that Acrocephalus Warblers resumed the signing if a female left the territory. The purpose of the study is to demonstrate that male Sedge Warblers with more sophisticated songs should attract females before their rivals, who have more simple songs.

The discussion of the calculations made will include the graphs of the data to make the results more visual. The goal is to see in which of these areas: pressure differentials endured, joint mobility, resistance to bending moments, approximate density, and wingspan ratio; do puffins characteristics exist within the pelican and the penguin. Again it must be stated that many of the calculations were under the assumption that we can model all puffins as an Atlantic puffin, all penguins as the Emperor penguin, and all pelicans as the American white pelican.

The Club-winged Manakin produces mechanical sounds that are acoustically unique to the rest of the manakins, which also exhibit mechanical sound displays. Studies have shown that male Club-winged Manakins exhibit a display in which the wings are thrown open and mechanical sounds are produced, but there have been very few studies on the behavioral intensions of such a display. However, enough studies have been made about the mechanics of the Club-winged Manakin display to create a baseline for further studies on the evolutionary behaviors as to why this type of display developed (Bostwick 2000). One of the most pervasive morphological features of birds is a semi-hollow pneumatic bone structure that is filled with honeycomb-shaped bone marrow and air sacs. This semi-hollow form maximizes flexural strength and stiffness with a minimal amount of dense bone material, allowing many modern birds to fly and breathe efficiently. High-resolution microCT scans of the wings of two male Club-winged Manakins uncovered that this species exhibits an exception to the typical pneumatic bone structure and contains solidified ulnae that is more than three times the volume of birds of comparable body size, with significantly higher tissue mineral densities (Bostwick et al. 2012). These studies examining the pair of unique

Corucia zebrata have been shown to exhibit some degree of sexual dichromatism and dimorphism, however the differences are not highly distinctive between the sexes in allowing for easy interpretation (Vosjoli, 1993). C. zebrata have large cylindrical