Chemical signals in vertebrates 11

Chemical Signals in Vertebrates, Volume 12
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A group of individuals at one location is referred to as an aggregation, whether consisting of one sex or both sexes. Male-produced sex attractants have been called aggregation pheromones, because they usually result in the arrival of both sexes at a calling site and increase the density of conspecifics surrounding the pheromone source. Most sex pheromones are produced by the females; only a small percentage of sex attractants are produced by males. In recent decades, the importance of applying aggregation pheromones in the management of the boll weevil Anthonomus grandis , stored product weevils Sitophilus zeamais , Sitophilus granarius , Sitophilus oryzae , and pea and bean weevil Sitona lineatus has been demonstrated.

Table of contents

Aggregation pheromones are among the most ecologically selective pest suppression methods. They are nontoxic and effective at very low concentrations.

Some species release a volatile substance when attacked by a predator that can trigger flight in aphids or aggression in ants , bees , termites [8] in members of the same species. For example, Vespula squamosa use alarm pheromones to alert others to a threat. These tannins make the plants less appetizing for the herbivore.

Epideictic pheromones are different from territory pheromones, when it comes to insects.

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Fabre observed and noted how "females who lay their eggs in these fruits deposit these mysterious substances in the vicinity of their clutch to signal to other females of the same species they should clutch elsewhere. Releaser pheromones are pheromones that cause an alteration in the behavior of the recipient. For example, some organisms use powerful attractant molecules to attract mates from a distance of two miles or more.

In general, this type of pheromone elicits a rapid response, but is quickly degraded.

1.1. INTRODUCTION

Life Unfolding. Physiology of behavior 11th ed. Mason, Robert T. The recent physico-chemical download chemical signals water were rearranged physical review and resistance length as unique tools for this other coal, but their models on single team have many. Boar pheromones are sprayed into the sty , and those sows that exhibit sexual arousal are known to be currently available for breeding. Animal Behaviour.

In contrast, a primer pheromone has a slower onset and a longer duration. For example, rabbit mothers release mammary pheromones that trigger immediate nursing behavior by their babies. Signal pheromones cause short-term changes, such as the neurotransmitter release that activates a response.

For instance, GnRH molecule functions as a neurotransmitter in rats to elicit lordosis behavior. Primer pheromones trigger a change of developmental events in which they differ from all the other pheromones, which trigger a change in behavior. Laid down in the environment, territorial pheromones mark the boundaries and identity of an organism's territory. In cats and dogs, these hormones are present in the urine, which they deposit on landmarks serving to mark the perimeter of the claimed territory. In social seabirds, the preen gland is used to mark nests, nuptial gifts, and territory boundaries with behavior formerly described as ' displacement activity '.

Social insects commonly use trail pheromones. For example, ants mark their paths with pheromones consisting of volatile hydrocarbons. Certain ants lay down an initial trail of pheromones as they return to the nest with food.

This trail attracts other ants and serves as a guide. The pheromone requires continuous renewal because it evaporates quickly. When the food supply begins to dwindle, the trail-making ceases. Pharaoh ants Monomorium pharaonis mark trails that no longer lead to food with a repellent pheromone, which causes avoidance behaviour in ants.

When species of wasps such as Polybia sericea found new nests, they use pheromones to lead the rest of the colony to the new nesting site.

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Gregarious caterpillars, such as the forest tent caterpillar , lay down pheromone trails that are used to achieve group movement. In animals, sex pheromones indicate the availability of the female for breeding. Male animals may also emit pheromones that convey information about their species and genotype. At the microscopic level, a number of bacterial species e. Bacillus subtilis , Streptococcus pneumoniae , Bacillus cereus release specific chemicals into the surrounding media to induce the "competent" state in neighboring bacteria.

Wir empfehlen

Among eukaryotic microorganisms, pheromones promote sexual interaction in numerous species. In addition, male copepods can follow a three-dimensional pheromone trail left by a swimming female, and male gametes of many animals use a pheromone to help find a female gamete for fertilization. In addition, Colias eurytheme butterflies release pheromones, an olfactory cue important for mate selection. The effect of Hz-2V virus infection on the reproductive physiology and behavior of female Helicoverpa zea moths is that in the absence of males they exhibited calling behavior and called as often but for shorter periods on average than control females.

Even after these contacts virus-infected females made many frequent contacts with males and continued to call; they were found to produce five to seven times more pheromone and attracted twice as many males as did control females in flight tunnel experiments. Pheromones are also utilized by bee and wasp species.

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Some pheromones can be used to suppress the sexual behavior of other individuals allowing for a reproductive monopoly — the wasp R. Pheromones are also used in the detection of oestrus in sows. Boar pheromones are sprayed into the sty , and those sows that exhibit sexual arousal are known to be currently available for breeding.

Chemical Signals in Vertebrates 11

Sea urchins release pheromones into the surrounding water, sending a chemical message that triggers other urchins in the colony to eject their sex cells simultaneously. This classification, based on the effects on behavior, remains artificial. Pheromones fill many additional functions. Olfactory processing of chemical signals like pheromones has evolved in all animal phyla and thus is the oldest phylogenetic receptive system shared by all organisms including bacteria. It has been suggested that it serves survival by generating appropriate behavioral responses to the signals of threat, sex and dominance status among members of the same species.

Furthermore, it has been suggested that in the evolution of unicellular prokaryotes to multicellular eukaryotes , primordial pheromone signaling between individuals may have evolved to paracrine and endocrine signaling within individual organisms. Some authors assume that approach-avoidance reactions in animals, elicited by chemical cues, form the phylogenetic basis for the experience of emotions in humans.

The human trace amine-associated receptors are a group of six G protein-coupled receptors i. A review of studies involving non-human animals indicated that TAARs in the olfactory epithelium can mediate attractive or aversive behavioral responses to a receptor agonist.

Overview of cell signaling

In reptiles , amphibia and non-primate mammals pheromones are detected by regular olfactory membranes, and also by the vomeronasal organ VNO , or Jacobson's organ, which lies at the base of the nasal septum between the nose and mouth and is the first stage of the accessory olfactory system.

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Brand new Book. This volume is a collection of the proceedings of this meeting and, like the meeting, cover a variety of topics in chemical ecology, including Chemical Ecology of Social Behavior; Chemical Signals - Analysis and Synthesis; Evolution, Genomics, and Transcriptomics of Chemical Signals; Molecular Mechanisms of Semiochemical Perception and Processing; Multimodal Communication; and Neuroethology and Neurophysiology. Seller Inventory AAC Items related to Chemical Signals in Vertebrates Chemical Signals in Vertebrates Publisher: Springer , This specific ISBN edition is currently not available.

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