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protandry
protandry
1. The condition in which the male reproductive organs (stamens) of a flower mature before the female ones (carpels), thereby ensuring that self-fertilization does not occur. Examples of protandrous flowers are ivy and rosebay willowherb. Compare protogyny; homogamy. See also dichogamy. 2. The condition in some hermaphrodite or colonial invertebrates in which the male gonads or individuals are sexually mature before the female ones. Compare protogyny. |
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Cite this article
"protandry." A Dictionary of Biology. 2004. Encyclopedia.com. 30 May. 2012 <http://www.encyclopedia.com>. "protandry." A Dictionary of Biology. 2004. Encyclopedia.com. (May 30, 2012). http://www.encyclopedia.com/doc/1O6-protandry.html "protandry." A Dictionary of Biology. 2004. Retrieved May 30, 2012 from Encyclopedia.com: http://www.encyclopedia.com/doc/1O6-protandry.html |
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protandry
protandry
1. The production of sperm in males before females produce eggs (e.g. some roundworms). 2. The arrival of males before females at breeding grounds (e.g. many territorial bird species). Compare PROTOGYNY. 3. In sequential hermaphrodites, the occurrence of the male form in younger, smaller individuals and the female in larger, older individuals. |
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Cite this article
MICHAEL ALLABY. "protandry." A Dictionary of Zoology. 1999. Encyclopedia.com. 30 May. 2012 <http://www.encyclopedia.com>. MICHAEL ALLABY. "protandry." A Dictionary of Zoology. 1999. Encyclopedia.com. (May 30, 2012). http://www.encyclopedia.com/doc/1O8-protandry.html MICHAEL ALLABY. "protandry." A Dictionary of Zoology. 1999. Retrieved May 30, 2012 from Encyclopedia.com: http://www.encyclopedia.com/doc/1O8-protandry.html |
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protandry
protandry(adj.protandrous)
1. In plants, the maturation of anthers (i.e. male organs) before carpels (female organs). 2. The production of sperm in males before females produce eggs (e.g. some roundworms). 3. The arrival of males before females at breeding grounds (e.g. many territorial bird species). Compare protogyny. |
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Cite this article
MICHAEL ALLABY. "protandry." A Dictionary of Ecology. 2004. Encyclopedia.com. 30 May. 2012 <http://www.encyclopedia.com>. MICHAEL ALLABY. "protandry." A Dictionary of Ecology. 2004. Encyclopedia.com. (May 30, 2012). http://www.encyclopedia.com/doc/1O14-protandry.html MICHAEL ALLABY. "protandry." A Dictionary of Ecology. 2004. Retrieved May 30, 2012 from Encyclopedia.com: http://www.encyclopedia.com/doc/1O14-protandry.html |
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protandry
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Cite this article
MICHAEL ALLABY. "protandry." A Dictionary of Plant Sciences. 1998. Encyclopedia.com. 30 May. 2012 <http://www.encyclopedia.com>. MICHAEL ALLABY. "protandry." A Dictionary of Plant Sciences. 1998. Encyclopedia.com. (May 30, 2012). http://www.encyclopedia.com/doc/1O7-protandry.html MICHAEL ALLABY. "protandry." A Dictionary of Plant Sciences. 1998. Retrieved May 30, 2012 from Encyclopedia.com: http://www.encyclopedia.com/doc/1O7-protandry.html |
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