FishHermaphroditism: Difference between revisions
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= Hermaphroditism in Fish = | = Hermaphroditism in Fish = | ||
=== Protogyny === | |||
*Sex change from female to male | |||
*Displayed as normal part of life history in 14 fish families, including wrasses and parrotfishes<ref name="warner"/> | |||
=== Protandry === | |||
*Sex change from male to female; less common than protogyny | |||
*Observed in 8 different families of fish; coral reef examples including porgies, damselfishes, and moray eels<ref name="warner"/> | |||
== Sequential Hermaphroditism == | |||
* Sequential hermaphrodites function as one gender and then switch to the other, often as a result of changing population dynamics <ref name="sumich" /> | |||
=== Size Advantage Model === | |||
* Large males have higher mating success than smaller males; size less important for females | |||
* Can be beneficial to start as a female and then become a male once a large enough size is reached to maximize mating ability <ref name="warner">Warner, Richard R. "Mating Behavior and Hermaphroditism in Coral Reef Fishes." American Scientist 72.2 (1984): 128-36. Web. </ref> | |||
=== Common Hermaphroditism in Wrasses and Parrotfishes === | |||
*Dominant male defends group of female fish from other males; only dominant male mates with multiple females (polygny) | |||
*When dominant male dies, largest female in harem changes sex and becomes the new dominant male (sequential hermaphroditism) <ref>Hixon, M.A. "Coral Reef Fishes." Encyclopedia of Ocean Sciences 2 (2009): 655-59. Web. </ref> | |||
== Simultaneous Hermaphroditism == | |||
* Simultaneous hermaphrodites have both female and male gender roles at the same time <ref name="sumich">Sumich, James L. An Introduction to the Biology of Marine Life, Seventh Edition. WCB/McGraw Hill. 1999.</ref> | * Simultaneous hermaphrodites have both female and male gender roles at the same time <ref name="sumich">Sumich, James L. An Introduction to the Biology of Marine Life, Seventh Edition. WCB/McGraw Hill. 1999.</ref> | ||
== References == | == References == | ||
<references /> | <references /> | ||
Revision as of 20:29, 24 February 2015
Hermaphroditism in Fish
Protogyny
- Sex change from female to male
- Displayed as normal part of life history in 14 fish families, including wrasses and parrotfishes[1]
Protandry
- Sex change from male to female; less common than protogyny
- Observed in 8 different families of fish; coral reef examples including porgies, damselfishes, and moray eels[1]
Sequential Hermaphroditism
- Sequential hermaphrodites function as one gender and then switch to the other, often as a result of changing population dynamics [2]
Size Advantage Model
- Large males have higher mating success than smaller males; size less important for females
- Can be beneficial to start as a female and then become a male once a large enough size is reached to maximize mating ability [1]
Common Hermaphroditism in Wrasses and Parrotfishes
- Dominant male defends group of female fish from other males; only dominant male mates with multiple females (polygny)
- When dominant male dies, largest female in harem changes sex and becomes the new dominant male (sequential hermaphroditism) [3]
Simultaneous Hermaphroditism
- Simultaneous hermaphrodites have both female and male gender roles at the same time [2]
References
- ↑ 1.0 1.1 1.2 Warner, Richard R. "Mating Behavior and Hermaphroditism in Coral Reef Fishes." American Scientist 72.2 (1984): 128-36. Web.
- ↑ 2.0 2.1 Sumich, James L. An Introduction to the Biology of Marine Life, Seventh Edition. WCB/McGraw Hill. 1999.
- ↑ Hixon, M.A. "Coral Reef Fishes." Encyclopedia of Ocean Sciences 2 (2009): 655-59. Web.