FishPredation: Difference between revisions
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*Factors Affecting Capture | *Factors Affecting Capture | ||
**For Predator: mouth gape, strike speed, handling | **For Predator: mouth gape, strike speed, handling | ||
**For Prey: escape capabilities, schooling, shelter seeking behavior | **For Prey: escape capabilities, schooling, shelter seeking behavior<ref name="Bailey" /> | ||
== Other Feeding Factors == | == Other Feeding Factors == | ||
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**Ex: after fish larvae hatch | **Ex: after fish larvae hatch | ||
*Most are active either during the day or at night, not 24 hours | *Most are active either during the day or at night, not 24 hours | ||
*Diurnal or nocturnal feeding is normally fixed genetically | *Diurnal or nocturnal feeding is normally fixed genetically<ref name="Hixon" /> | ||
== Importance of Predation == | == Importance of Predation == | ||
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**trophic cascade/ top-down control | **trophic cascade/ top-down control | ||
*Important Evolutionary Force | *Important Evolutionary Force | ||
References | |||
<references> | |||
<ref name="Bailey">K.M. Bailey, JT. Duffy Anderson. 2001. Fish Predation and Mortality. Encyclopedia of Ocean Sciences (Second Edition). Pages 417-421.</ref> | |||
<ref name="Hixon">Hixon, Mark A. 1991. Predation as a Process Structuring Coral Reef Communities.Oregon State University Publishing. | |||
http://hixon.science.oregonstate.edu/files/hixon/publications/026%20-%20Hixon%2091%20Sale%20book.pdf </ref> | |||
</references> | |||
Revision as of 23:13, 5 March 2014
Fish Predation
Common Methods
- Stalking
- Chasing
- Ambush
- Habituation
- Angling
Predation Model
- Energy vs. Cost
- Search → Encounter → Strike → Capture
- Factors Affecting Search:
- For Predator: Hunger
- For Prey: Camouflage
- Factors Affecting Encounter
- For Predator: Swimming Speed, water clarity, illumination, schooling, detection mechanisms
- For Prey: morphology, activity level, pigmentation, distribution
- Factors Affecting Strike
- For Predator: alternative prey, location
- For Prey: body size, sensory ability
- Factors Affecting Capture
- For Predator: mouth gape, strike speed, handling
- For Prey: escape capabilities, schooling, shelter seeking behavior[1]
Other Feeding Factors
- Size is the most important factor in determining predation rates
- ex: There is a decreasing rate of predation with Jellyfish as fish larvae size increases.
- Predation happens at all sizes
- Ex: microscopic organisms to large whales
- Highest rates of predation occur on juvenile fish.
- Predation is most common during life transitions.
- Ex: after fish larvae hatch
- Most are active either during the day or at night, not 24 hours
- Diurnal or nocturnal feeding is normally fixed genetically[2]
Importance of Predation
- Food web
- trophic cascade/ top-down control
- Important Evolutionary Force
References
- ↑ K.M. Bailey, JT. Duffy Anderson. 2001. Fish Predation and Mortality. Encyclopedia of Ocean Sciences (Second Edition). Pages 417-421.
- ↑ Hixon, Mark A. 1991. Predation as a Process Structuring Coral Reef Communities.Oregon State University Publishing. http://hixon.science.oregonstate.edu/files/hixon/publications/026%20-%20Hixon%2091%20Sale%20book.pdf