Aquatic plants in the northern Russian Far East: problems and perspectives|
Alexander BOBROV1 & Olga MOCHALOVA2
1 Papanin Institute for Biology of Inland Waters RAS, Borok, Russia
2 Institute of Biological Problems of the North FEB RAS, Magadan, Russia
Aquatic plants in the north of the Russian Far East (RFE) are still poorly studied
and knowledge about them differs between regions. The most problematic genera
Óre Potamogeton, Batrachium and Sparganium. In Potamogeton there
are questions on status of some taxa, their relations with close species, e.g. P. borealis
with P. filiformis, P. subsibiricus and P. anadyrensis with P. sibiricus,
and P. tenuifolius with P. alpinus. North American P. richardsonii and
P. strictifolius occur in the area. It is of interest how widely these species are
spread. Tropical P. fryeri, P. digynus, P. distinctus are recorded here. Are
these records correct? What promotes their preservation under these conditions? Also hybrid activity study
in this genus is important. Batrachium circinatum, B. kauffmannii and B. trichophyllum
are common in the northern RFE. Other taxa need studying. Is real B. eradicatum presented here or it is a small
form of other species? Heterophyllous B. mongolicum (B. setosissimum), and its relation with close European
B. aquatile, B. floribundum and Japanese B. nipponicum are interesting. What is the large river form similar
to B. pseudofluitans, mentioned here as B. ashibetsuense and B. yezoense?
Besides Sparganium angustifolium, S. emersum, S. glomeratum, S. gramineum,
S. hyperboreum, S. natans, 1 (possibly 2) taxa of hybrid origin occur. It is
a stabilized hybrid of S. emersum or little-known S. probatovii described from Koryakiya.
Other hybrids in this genus can be expected. It is necessary to pay attention
to genera Callitriche, Myriophyllum, Utricularia and some others. The
status of Callitriche subanceps is unclear. The distribution and relationship between
Myriophyllum sibiricum and M. spicatum in the region is an open question.
Urticularia stygia, a new species for the Asiatic part of Russia, has been discovered
recently in the northern RFE. Cryptogamic macrophytes (freshwater macroalgae
and bryophytes) require special investigation. These plants are seldom taken into
account in hydrobotanical studies, however in some aquatic ecosystems they
form the core of macrophytic vegetation. The study is supported by grants of
RFBR no. 12-04-00074, 12-04-00904.
ę 2012 Organizing Committee