A type of graph or chart commonly used in circadian research to plot activity (present or absent) against time
Threatening behaviour usually associated with competition. It can involve predation however. A more specific term agonistic behaviour refers to conflicts within species but excludes predation
Any behaviour associated with conflict between two individuals.
A biological structure or chemical agent that interferes with the physiological action of another
A plant hormone that lengthens cells.
Internal timing systems that continue without external clues, and control (to some extent) the timing of activities of plants and animals.
(Science: psychology) awareness of one's environment, with reference to person, time and place.
A rhythm of about 24 hours.
A rhythm of about 1 year.
Working together between species or in a scecies
The mutual attraction between individuals of the opposite sex.
When an animal is active around sunrise and sunset.
Critical day length
The day length at which flowering is initiated
period of dormancy, usually seasonal, which growth and development cease and metabolism is greatly reduced
belonging to or active during the day
the condition of having the most control
a period when an organism's growth or activity stops
are outside the nervous system and include muscles that contract and glands that secrete when stimulated by nerve impulses
Originating or produced within the organism or one of its parts.
Process by which an internal clock becomes reset by rhythmic environmental factors
the act of causing a plant to develop without chlorophyll by growing it without exposure to sunlight
the infection or disease originates outside the body
Free Running Period
The natural period of the rhythm if there are no external cues.
a cue using the earths magnetic field e.g homing pigeons use it
the torpid or resting state in which some animals pass the winter
a group or system in which positions of power are ranked, usually from lowest to highest
orienting or directing homeward or to a destination
chemical "messengers" of the endocrine system that are released into the blood
present at birth but not necessarily hereditary
the idea that evolution has selected altruism toward one's close relatives to enhance the survival of mutually shared genes.
A movement or activity of a cell or an organism in response to a stimulus that is non-directional; haphazardous.
having or showing profound knowledge
Long Day Plant
Plant that generally requires short nights-- less that 10-12 hours of darkness to begin the flowering process.
periodic movement and return of animals from one place to another
the act of mimicking
marriage with one mate at a time
Reversible growth or turgor movement in response to a non directional stimulus
belonging to or active during the night
the lobes of the brain that receive signals from the receptors in the eyes
Prolonged relationship between male and female, associated with joint parental care
a shift in the activity of a biological rhythm, typically provided by a synchronizing environment stimulus
pertaining to light
A plant pigment that controls the photoperiodic response
located in the brain; secretes hormone melatonin; in some species, it regulates the biological clock and biorhythms
Special structures that allow living organisms to sense the conditions of their internal or external environment
marked differences between the secondary sex characteristics of males and females
Short Day Plant
Plant that generally requires long nights-- 12 or more hours of darkness to begin the flowering process.
Serves as a navigational cue. Many birds use star patterns and movement for navigation.
a change in an organism's surroundings that causes the organism to react
willing to submit without resistance to authority
A biological clock that enables a migrating bird or insect to fly using the sun and continuously adjust its angle to the sun while flying.
Movement toward or away from a stimulus
any area that an animal defends against other animals
When plants respond to touch.
movement of a plant toward or away from stimuli
the environmental agent that resets the biological clock e.g: change in light, temperature