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... Science Frontiers ONLINE No. 41: Sep-Oct 1985 Issue Contents Other pages Home Page Science Frontiers Online All Issues This Issue Sourcebook Project Sourcebook Subjects The deceitful she-males "In many diverse taxa, males of the same species often exhibit multiple mating strategies. One well-documented alternative male reproductive pattern is 'female mimicry,' whereby males assume a female-like morphology or mimic female behavior patterns. In some species males mimic both female morphology and behavior. We report here female mimicry in a reptile, the red-sided garter snake (Thamnophis sirtalis parietalis). This form of mimicry is unique in that it is expressed as a physiological feminization. Courting male red-sided garter snakes detect a female-specific pheromone and normally avoid courting other males. However, a ... proportion of males release a pheromone that attracts other males, as though they were females. In the field, mating aggregations of 5-17 males were observed formed around these individual attractive males, which we have termed 'she-males.' In competitive mating trials, she-males mated with females significantly more often than did normal males, demonstrating not only reproductive competence but also a possible selective advantage to males with this female-like pheromone." In the competitive mating trials, the she-males were successful in 29 out of 42 trials. The normal males won out in only 13! The authors ask the question: Why aren't all males she-males given such an advantage? (Mason, Robert T., and Crews, David; "Female Mimicry ...
Terms matched: 2 - Score: 360 - 15 May 2017 - URL: /sf041/sf041p07.htm
... labels. For example, BHB1 = B (Biology)+ H (Humans)+ B (Behavior)+ 1 (first anomaly in Chapter BHB). Some anomalies and curiosities that are listed below have not yet been cataloged and published in catalog format. These do not have the alphanumerical labels. BA ARTHROPODS Titles not yet posted BB BIRDS BBA EXTERNAL APPEARANCE AND MORPHOLOGY BBA1 Avian Asymmetries BBA2 Female Hawks Larger Than Males BBA3 Skewed Sex Ratios of Offspring BBA4 Vividly Colored and Highly Patterned Avian Plumages and Ornaments BBA5 Plumage Polymorphism BBA6 Females with Male Plumage BBA7 Molting before Hatching BBA8 Unusual Diversification and Conservation in Plumage BBA9 Complexity and Sophistication of Feathers BBA10 Complexity and Sophistication of Feather Color-and-Pattern-Generation Mechanisms BBA11 Unusual Plumage-Color Changes BBA12 Feather Curiosities BBA13 Neoteny in Feathers BBA14 Tooth ... in Modern Birds BBA15 Birds Lacking Egg Teeth BBA16 Extreme Sexual Dimorphism in Bills BBA17 Bill Polymorphisms BBA18 Avian Bills: Unusual Adaptations BBA19 Wing Claws BBA20 Wing Spurs BBA21 The Alula or Bastard Wing BBA22 Some Curiosities of Avian Feet BBA23 Inherited Callosities BBA24 Unusual Pouches on Birds BBA25 Luminous Birds BBA26 Odoriferous Birds BBA27 Egg Complexity and Sophistication BBA28 Bird Eggs: Color, Pattern and Size Curiosities BBA29 Egg Mimicry BBA30 Mimicry of Other Species and the Environment BBA31 Remarkable Convergences of Appearance and Habits BBA32 Frightmolt BBA33 The Hollow in the Back of the Young Common Cuckoo BBB AVIAN BEHAVIOR BBB1 Avian Intelligence BBB2 Complexity and Sophistication of Avian Mental Processes BBB3 Enigmas of Instinct BBB4 Anomalous Altruism: Hard to Find BBB5 The Aesthetic Sense in Birds BBB6 Calculated Deception: Birds That Cry "Wolf" BBB7 Avian Play BBB8 Anomalous Aerial Tumbling and ...
Terms matched: 2 - Score: 336 - 15 May 2017 - URL: /cat-biol.htm
... Science Frontiers ONLINE No. 52: Jul-Aug 1987 Issue Contents Other pages Home Page Science Frontiers Online All Issues This Issue Sourcebook Project Sourcebook Subjects Aggressive Mimicry Field studies have revealed that bolas spiders can mimic the odor of female moths, thus attracting for consumption the male moths. More specifically, the hunting adult female spider, Mastophora cornigera , releases volatile substances containing three moth sex pheromone compounds. (Stowe, Mark K., et al; "Chemical Mimicry: Bolas Spiders Emit Components of Moth Prey Species Sex Pheromones," Science, 236:964, 1987.) Comment. As in many other cases of mimicry, one wonders how the spider's capability developed by chance and in small steps. From Science Frontiers #52, JUL-AUG 1987 . 1987- ... Science Frontiers ONLINE No. 52: Jul-Aug 1987 Issue Contents Other pages Home Page Science Frontiers Online All Issues This Issue Sourcebook Project Sourcebook Subjects Aggressive Mimicry Field studies have revealed that bolas spiders can mimic the odor of female moths, thus attracting for consumption the male moths. More specifically, the hunting adult female spider, Mastophora cornigera , releases volatile substances containing three moth sex pheromone compounds. (Stowe, Mark K., et al; "Chemical Mimicry: Bolas Spiders Emit Components of Moth Prey Species Sex Pheromones," Science, 236:964, 1987.) Comment. As in many other cases of mimicry, one wonders how the spider's capability developed by chance and in small steps. From Science Frontiers #52, JUL-AUG 1987 . 1987- ...
Terms matched: 2 - Score: 250 - 15 May 2017 - URL: /sf052/sf052b11.htm
... to dupe an insect pollinator -- even with the aid of natural selection and a billion years. The point we wish to stress here is that the author of this paper sees the same facts and comes to diametrically opposite conclusions! Reference. Our handbook Incredible Life devotes and entire chapter to the anomalies of the plant kingdom. For further information, visit: here . This Orchid flower mimicks a female bee, thus encouraging pollination by male bees. From Science Frontiers #54, NOV-DEC 1987 . 1987-2000 William R. Corliss ...
Terms matched: 2 - Score: 200 - 15 May 2017 - URL: /sf054/sf054b09.htm
