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July 4th

  • ScienceDirect - Current Biology : Accelerated Rates of Floral Evolution at the Upper Size Limit for Flowers: Evolutionary theory explains phenotypic change as the result of natural selection, with constraint limiting the direction, magnitude, and rate of response [1]. Constraint is particularly likely to govern evolutionary change when a trait is at perceived upper or lower limits. Macroevolution ary rates of floral-size change are unknown for any angiosperm family, but it is predicted that rates should be diminished near the upper size limit of flowers, as has been shown for mammal body mass [2]. Our molecular results show that rates of floral-size evolution have been extremely rapid in the endoholoparasi te Rafflesia, which contains the world's largest flowers [3]. These data provide the first estimates of macroevolution ary rates of floral-size change and indicate that in this lineage, floral diameter increased by an average of 20 cm (and

June 30th

  • The Importance Of Fitness And Diet: Fitness can make all the difference in how your body looks and feels. Physical fitness is used in two close meanings: general fitness (a state of health and well-being) and specific fitness (a task-oriented definition based on the ability to perform s...

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April 19th

  • ScienceDirect - Trends in Ecology & Evolution : Evolution of the human pygmy phenotype: Small human body size, or the ?pygmy? phenotype, is characteristic of certain African, Southeast Asian and South American populations. The convergent evolution of this phenotype, and its strong association with tropical rainforests, have motivated adaptive hypotheses that stress the advantages of small size for coping with food limitation, warm, humid conditions and dense forest undergrowth. Most recently, a life-history model has been used to suggest that the human pygmy phenotype is a consequence of early growth cessation that evolved to facilitate early reproductive onset amid conditions of high adult mortality.

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March 28th

  • She doesn?t ?Look Native?? « random babble?: What really irked me, though, were the comments. "That?s really appalling. And for the record, as far as I can tell, no part of that image remotely resembles anything Navajo. I grew up in the Southwest (although I am not Navajo or Native American at all), so I can usually recognize the appropriate cultural markers."

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