ISSN:
1573-5052
Keywords:
Coenocline
;
Drawdown
;
Emergent zone
;
Iowa
;
Marsh
;
Meadow zone
;
Perturbation
;
Primary production
;
Simpson's index
;
Submersed zone
;
Wetland
;
Zonation
Source:
Springer Online Journal Archives 1860-2000
Topics:
Biology
Notes:
Summary Comparisons of a wetland coenocline before and after a drought-caused drawdown and the refilling of the basin to a higher-than-normal water level revealed that there was little difference in the above ground standing crop or in the floristic composition of the submersed, emergent or meadow zones along the coenocline. However, the position of many species along the coenocline shifted in response to these perturbations.Sagittaria latifolia, Carex spp.,Patamogeton sp. aff.pusillus all were found 2 to 4 m closer to shore.Glyceria grandis is normally found only in the meadow zone; but after the drawdown, it was found along the whole lenght of the coenocline. The drawdown also nearly eliminatedCeratophyllum demersum from the coenocline. Species richness as a result of these perturbations increased in the submersed (3.3 to 5.9) and emergent (3.6 to 4.3) zones, but decreased in the meadow zone (7.6 to 6.0). The Simpson's index in all three zones was not appreciably influenced by the perturbations. The average Simpson's indices for the meadow, emergent and submersed zones were 0.4, 0.7 and 0.5 respectively.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF02111903
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