Download Predator-Prey Dynamics: The Role of Olfaction by Michael R. Conover PDF

By Michael R. Conover

People, being visually orientated, are good versed in camouflage and the way animals conceal from predators that use imaginative and prescient to find prey. besides the fact that, many predators don't hunt via sight; they hunt via smell. This increases the query: do survival mechanisms and behaviors exist which enable animals to conceal from those olfactory predators?  if that is so, what are they, and the way do they paintings? Predator-Prey Dynamics: The function of Olfaction examines environmental in addition to organic and behavioral parts of either predators and prey to respond to gaps in our present wisdom of the survival dynamics of species. starting with a radical examine the mechanics of olfaction, the writer explains how predators discover, find, and tune their prey utilizing smell trails at the flooring or scent plumes within the air. figuring out the physics of airflow is your next step to realizing the opportunity of manipulating and overlaying odor. whereas a bush may possibly disguise an animal visually from a predator, it's going to now not safeguard an animal from a predator utilizing olfaction.  to conceal from the latter, an animal must conceal in destinations the place turbulence and updrafts will disperse its smell. The publication addresses tradeoffs that animals needs to make given their twin must disguise from predators and to obtain nutrition and water. reviews of mammalian and avian habit supply examples at the genuine use and efficacy of olfactory camouflage strategies. The e-book concludes with a redefinition of ecological phrases in response to the physics of airflow and a precis of the idea and implications of olfactory predator--prey dynamics. Introducing the mechanics of olfaction and its effect at the habit of either predators and prey, Predator-Prey Dynamics: The function of Olfaction provides a brand new belief of the realm and allows us to appreciate and extra successfully deal with the fragile survival dynamics of animals within the wild.

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Extra info for Predator-Prey Dynamics: The Role of Olfaction

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This is certainly true in the natural environment. People consider air to be still when its velocity is less than 4 to 6 km/hour because below this velocity they cannot feel wind blowing against their skin, and the wind does not have enough force to move vegetation. However, even when the air seems still to humans, the force of convection moves odorants through the air at speeds thousands of times faster than the forces of diffusion or gravity. Hence, the forces of diffusion can be ignored when considering the movements of odorants through the air because they play an insignificant part compared to the forces of convection.

As this odor cloud moves downwind, it will disperse, and the odorant will become diluted. Hence, an odor plume will be quickly diluted to undetectable levels on windy days. This principle was demonstrated with the insect Spodoptera litura because the distance over which male insects could detect a pheromone source decreased with wind speed (Nakamura 1976). The atmospheric forces that control wind speed and its direction are discussed in Appendix 3. Impact of turbulence on odorant concentration At any instant, wind speed and direction will often vary at two points even when those points are separated by only a few centimeters.

The third is to backtrack; this involves stopping at some point and walking backward, ideally placing your feet in the exact same place where they first struck the ground. The really smart Hollywood heroes like Walt Disney’s Davy Crockett or Daniel Boone would then jump up and grab a tree branch and climb along it for a while so that their feet did not touch the ground. According to Hollywood, these techniques were all effective at fooling any dog following a trail (at least for the good guy). fm Page 27 Friday, February 23, 2007 11:39 AM Chapter two: Detecting and locating prey through depositional odor trails 27 Impact of environmental conditions on depositional odor trails Several environmental factors influence the strength of a depositional odor trail and the ability of predators to follow it.

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