linkedin post 2016-12-03 06:25:37

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SINKS. "A sink is defined as a net importer of nutrients (nitrogen (N), phosphorus (P), potassium (K), sulfur (S) and other minerals) and assimilates carbon (C) derived directly or indirectly from photosynthesis. Developing seeds, bulbs, tubers and other structures that accumulate storage compounds are strong sinks, as are expanding leaves and branches during vigorous vegetative growth." https://lnkd.in/dPac2Jv View in LinkedIn
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linkedin post 2016-12-03 06:21:10

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FOREST TURNOVER. "Molecules, cells, phytomers, individuals and even whole floras typically turn over. Turnover is defined as flux through a pool. In the case of leaf turnover, the pool is the canopy. Newly initiated leaves are recruited to the canopy, grow and mature, become senescent and ultimately die and leave the pool." https://lnkd.in/dPac2Jv View in LinkedIn
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linkedin post 2016-12-03 06:16:54

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DECIDUOUS TREES. "Here much of the plant body is made up of dead tissues, the canopy is renewed and discarded every year, root systems turn over, and reproduction takes place repeatedly over decades, centuries or even millennia. In iteroparous species, such as trees and clonal plants, there is a disjunction between the lifespans of the whole and parts." https://lnkd.in/dPac2Jv View in LinkedIn
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linkedin post 2016-12-03 06:14:01

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PLANT DECISIONS. "Somatic tissue senescence, abscission, and the cessation of meristematic activity are all examples of life-and-death decisions made by plants throughout their life cycles. These decisions may affect specific organ systems or, when acting in concert, may lead to the demise of the entire plant." https://lnkd.in/dNWP3KD View in LinkedIn
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linkedin post 2016-12-03 06:10:03

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PROGRAMMED DEATH. "The importance of programmed cell death in animal development is becoming increasingly appreciated, but it is in higher plants that the attrition of cells, tissues, and even whole organ systems plays a continuing role in shaping the organism's architecture and its progression through its life cycle." https://lnkd.in/dNWP3KD View in LinkedIn
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linkedin post 2016-12-03 06:05:16

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FRAGMENT FROM NATURE for the next two weekends concerns my annual autumnal observation that trees of the same species drop (and later sprout) leaves at precisely the same time, even though that time differs from year to year, based on rainfall and other conditions. Somehow, they all have done the same calculation and arrived at the same conclusion. Or, they all tuned into the same (spooky) channel. Quite remarkable. View in LinkedIn
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linkedin post 2016-12-04 06:34:24

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TWO GREAT AND DIFFERENT GROUPS. "Animals, being heterotrophic, have to reconcile the energy demands of repair and maintenance activities with those of growth and reproduction. Some theories consider age-related physiological deterioration and mortality to be a reflection of a progressive imbalance in this relationship. It is questionable, however, whether such an explanation can apply to autotrophic organisms such as green plants." https://lnkd.in/dPac2Jv View in LinkedIn
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linkedin post 2016-12-05 06:41:21

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TRANSITION DRIVERS. "We show how these steps require cooperation, division of labor, communication, mutual dependence, and negligible within-group conflict. We find that certain ecological conditions and the ways in which groups form have played recurrent roles in driving multiple transitions." http://www.pnas.org/content/112/33/10112.full View in LinkedIn
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