Pheromone
Chemical messengers that trigger social responses within a species.
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A pheromone is a chemical that is secreted or excreted by an organism, triggering a social response in members of the same species. These chemical messengers are used by many organisms, from unicellular prokaryotes to complex multicellular eukaryotes, and their use among insects has been particularly well documented. Pheromones affect behavior or physiology and include alarm, food trail, sex, and other types.
- field
- Chemical ecology
- known_for
- Chemical signals that trigger social responses in conspecifics
- first_characterized_chemical
- Bombykol (by Adolf Butenandt)
- also_classified_as
- Ecto-hormones
Lore & Background
Pheromones are categorized by function. Aggregation pheromones function in mate choice, overcoming host resistance, and defense against predators. Alarm pheromones, released when attacked by a predator, can trigger flight or aggression in members of the same species. Epideictic pheromones signal to other females to lay eggs elsewhere. Territorial pheromones mark boundaries and identity, while trail pheromones guide social insects like ants to food sources. Sex pheromones indicate the availability of a female for breeding and are also used by bacteria and eukaryotic microorganisms for sexual interaction.
Reader's Guide
Pheromones are a major topic of research in chemical ecology, with their ecological functions and evolution being widely studied. They are used by organisms ranging from basic unicellular prokaryotes to complex multicellular eukaryotes, with insect pheromones being particularly well documented. Aggregation pheromones have proven useful in managing pests like the boll weevil and stored product weevils, offering ecologically selective, non-toxic pest suppression at very low concentrations. Alarm pheromones have been documented in a mammalian species, the pronghorn, which releases a compound described as smelling like buttered popcorn. The study of pheromones continues to reveal how chemical signals shape behavior, physiology, and social organization across the tree of life.
Did You Know?
- Pheromones are also sometimes classified as ecto-hormones.
- The first chemically well-characterized pheromone was bombykol, released by the female silkworm to attract mates.
- Alarm pheromones have been documented in a mammalian species, the pronghorn, which releases a compound described as smelling like buttered popcorn.
- Aggregation pheromones have been used to manage pests such as the boll weevil and stored product weevils.
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Frequently Asked Questions
What exactly is a Pheromone in the Cell And Molecular Biology 25-36 entry?
A pheromone is a chemical messenger released by an organism that elicits a specific social or physiological response in another member of the same species. It functions as an inter-individual signal rather than an internal hormone, operating in the field of chemical ecology.
Who was the first to characterize a Pheromone, and what was it?
Adolf Butenandt was the first to isolate and chemically characterize a pheromone, identifying bombykol as the sex pheromone of the silkworm moth. This landmark work laid the groundwork for the entire discipline of chemical ecology.
What are the main types or 'powers' of Pheromones?
Pheromones fall into several functional classes, including alarm signals, food-trail markers, sex attractants, and aggregation or territorial cues. They can alter either the behavior or the physiology of the receiving organism, and their use spans everything from unicellular prokaryotes to complex multicellular animals.
Why is the Pheromone entry considered important in the Cell And Molecular Biology series?
Pheromones represent a foundational example of how cells and organisms coordinate through extracellular chemical signals, bridging molecular biochemistry with ecology and behavioral biology. Their study in insects is especially well documented, making them a key model for understanding intercellular and inter-organism communication.
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