S. Ye. Sadogurskiy, T. V. Belich, S. A. Sadogurskaya
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引用次数: 0
Abstract
The study of the macrophytobenthos annual cycle of the aquatic component in the Cape Martyan Reserve has revealed that sporophytes of the invasive transforming species Bonnemaisonia hamifera Hariot (Trailliella phase) that had successfully naturalized in coastal waters off the southern coast of Crimea (SCC) abundantly form specialized organs of asexual reproduction. Mature tetrasporangia have been registered at every phytal zone in autumn. Their morphology and morphometry, which are of an important diagnostic value, have been identified and measured. It has been found that all thalli cells, except for apical ones, could develop into sporangia, with the maximum number being formed in the terminal branches, with the most common rows of up to 3–4 pcs. Considering that the formation of tetrasporangia occurs only in a narrow range of light–temperature conditions of a short autumn and spring day, we have showed that, in the SCC, the favorable period for this process lasts from the first decade of October to the second decade of December. In spring, in the rather deep open water areas near the SCC, under modern climatic conditions, the formation of tetrasporangia is limited by water temperature, so its occurrence is unlikely. However, in relatively isolated shallow bays and lagoons, typical for other coastal regions of the Azov–Black Sea basin, it is possible due to local water temperature rise in the first half of March. Still, the ability of sporophyte thalli to vegetatively reproduce by forming an unlimited number of fragments that retain their viability and potential for further fragmentation, seems to be the key factor ensuring the availability and rapid spread of B. hamifera in the SCC and in the whole Azov–Black Sea region.
期刊介绍：
Inland Water Biology publishes thematic reviews and original papers devoted to flora and fauna in waterbodies, biodiversity of hydrobionts, biology, morphology, systematics, ecology, ethology, ecological physiology and biochemistry of aquatic organisms, patterns of biological cycle, structure and functioning of aquatic ecosystems, anthropogenic and uncontrolled natural impacts on aquatic organisms and ecosystems, invasion of nonindigenous species into ecosystems and their ecology, methods of hydrobiological and ichthyological studies.
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