Download The Ecology of a Salt Marsh by R. G. Wiegert, L. R. Pomeroy, W. J. Wiebe (auth.), Lawrence PDF

By R. G. Wiegert, L. R. Pomeroy, W. J. Wiebe (auth.), Lawrence R. Pomeroy, Richard G. Wiegert (eds.)

Ecologists have long-standing how you can learn huge ecosystems similar to lakes, forests, and salt-marsh estuaries. within the first, which G. E. Hutchinson has referred to as the holological process, the full atmosphere is first studied as a "black box," and its elements are investigated as wanted. within the moment, which Hutchinson has known as the merological technique, the elements of the method are studied first, and an try is then made to accumulate the complete from them. For long term reports, the holological strategy has distinct benefits, because the normal styles and tentative hypotheses which are first labored out support direct awareness to the parts of the process which have to be studied in larger aspect. during this technique, groups of investigators specialize in significant func­ tions and hypotheses and thereby coordinate their autonomous examine efforts. hence, even though there were waves, because it have been, of investigators and graduate scholars engaged on assorted points of the Georgia salt-marsh estuaries (personnel on the Marine Institute on Sapelo Island adjustments each few years), the emphasis at the holo­ logical method has ended in a hugely differentiated and well-coordinated long term learn. Very in brief, the heritage of the salt-marsh experiences will be defined as follows. First, the final styles of nutrients chains and different power flows within the marshes and creeks have been labored out, and the character of imports and exports to and from the method and its subsystems have been delimited.

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Extra resources for The Ecology of a Salt Marsh

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BIn the northern and southern areas of the Duplin River watershed. While there is potential for strong interaction between solar radiation and photosynthesis, actual relationships in nature may vary with an extensive array of environmental factors. For example, tall S. 4). The oldest tissue in December usually exhibited a more flattened response curve, but photosynthesis was light saturated only at high light intensity. Conversely, short S. alterniflora had lower rates of photosynthesis and became saturated under specific seasonal-temperature-radiation combinations.

Altemijlora andJ. 2. Net Annual Aerial Primary Production Estimates for S. alterniflora and Juncus roemerianus gdry wt. m- 2 S. altemiflora Streamside High Marsh ~From Odum and Fanning (1973). From Gallagher et a1. (1980). cFrom Gallagher et a1. (1972). Whole Marsh Juncusroemerianus January J. roemerianus 15 5 15 5 January S. alterniflora . short March May JUly 15 5 5 September 15 5 B December S . alterniflora. 3. Mean daily rate curves of photosynthesis of S. altemiflora and 1. roemerianus, measured in situ in the Sapelo Island salt marsh (mg CO2 • dn- 2 • hr- 1 , from 0700 to 1900 hr).

This sequence of new marsh development is particularly noticeable in areas of deposition of unconsolidated sediment. Numerous burrowing crabs of several species affect the structure of the marsh in much the same way that burrowing animals affect the structure of terrestrial soils. By bringing up subsurface sediment from the burrows and by reworking the upper 10 to 20 cm of sediments (Chapter 4), they promote erosion, percolation of water, and aeration of subsurface sediments. It is difficult to judge the significance of the activities of crabs relative to the recurrent development of evaporation cracks during daytime low tides in spring.

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