Modular and Structural-Functional Organization of g.
Sparganium L. Species in Different Ecological Conditions
E. A. BELYAKOV, A. G. LAPIROV
I. D. Papanin Institute for Biology of Inland Waters, RAS, 152742, Yaroslavl region, Nekouz district, Borok
Keywords: shoot system, structural elements, modular organization, structural-functionаl zones, Sparganium emersum, Sparganium nаtans, Sparganium erectum, Sparganium microcarpum
Abstract
Structure of monocarpic shoots of some representatives of the Sparganiaceae family (Sparganium emersum Rehm., S. nаtans L. (subgenus Xanthosparganium), Sparganium erectum L. and Sparganium microcarpum (Neum.) Domin (subgenus Melanosparganium)) was analyzed with the help of the modular approach. The structure of all three module categories - elementary (EM), universal (UM) and basic (BM) - was described. With decreasing of EM value, all investigated species lined up in the following descending order: S. emersum (23) > S. erectum (20) > S. nаtans (19) > S. microcarpum (18). It was determined that the level of EM similarity between two bur-reed subgenera reached 30 %. The rest EM part was specific for certain subgenera as well as for certain species. It was shown that dissimilarities between different ecological forms of Sparganium were due not to quantitative EM increase but to their transformation ability which improves species adaptation to varying water level conditions of reservoirs. UM value in the representatives of both subgenera equaled 4, BM values were represented by two similar variants. This was caused by the similarity of habitats of the model species. The plants’ special features on the level of structural-functional organization of different types of monocarpic shoots were shown. Differences in the set of structural-functionаl zones for particular shoot types were also revealed.
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