WSU BIOLOGY 103 - Animal Behavior Lab (9 pages)

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Animal Behavior Lab



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Animal Behavior Lab

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Pages:
9
School:
Washington State University
Course:
Biology 103 - Science and Scientific Thinking

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Biol 106 Animal Behavior Lab Spring 2008 Lab Behavioral Interactions of Crayfish In this lab we will observe interactive and aggressive behaviors of crayfish Procambarus clarkii Understanding complex interactions between individuals within a species can be investigated through behavior analyses We will observe both male and female crayfish as they interact with each other and describe the types of behavior involved in those interactions Background Males and females are sexually dimorphic in this species In the male the first two pairs of swimmerets are longer and prong shaped Labeled A in the image below They serve as a sperm transfer organ during mating Females have a seminal receptacle The sperm received from the male is stored here until the female releases her eggs Labeled B in the image below A B Male Female Most crayfish are nocturnal coming out at night to search for food During the day they remain either in burrows excavated in soft muddy bottoms or hidden beneath rocks logs or other debris Crayfish defend their burrows or hiding places vigorously against all intruders especially other crayfish Territorial behavior occurs in many species of animals Why do organisms exhibit territorial behavior List several possible reasons Agonistic fighting behavior of many decapod crustaceans features a variety of distinct behavior patterns Interactions start when animals advance to within one body length of another individual and overtly react to its presence The approaching animal is termed the initiator As the interaction progresses animals may use a variety of behaviors in an encounter Crayfish exhibit the following behaviors when fighting 1 1 Meral spread when individuals exhibit a posture characterized by raising the anterior portion of the body 2 Wrestling 3 Clawing an individual actively uses claws in an interaction pinching or jabbing with claw Another behavior you are likely to observe is called retreating where one individual attempts to move away from the other



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