IKBFU's Vestnik

Natural and medical sciences

Inroduction

Ecology and Nature Protection

Important Staging Sites of Geese and Swans in the Cross-Border Wetland Complex of the Neman Delta

Abstract

The article presents generalised data on internationally important staging sites of Greylag Goose (Anser anser), Greater White-fronted Goose (Anser albifrons), Lesser White-fronted Goose (Anser erythropus), Bean Goose (Anser fabalis), Whooper Swans (Cygnus Cygnus) and Bewick’s Swans (Cygnus bewickii) in the Neman River delta shared by Russia and Lithuania.The authors indicate the decrease in the population of Bean Geese alongside with the increase in the population of Greylag Geese, Whooper Swans, Bewick’s Swans and particularly Greater White-fronted Geese. This phenomenon is brought about by the global climate change, changes of the migratory flyways of certain species (particularly Greater White-fronted Goose) and by human impact.
In order to preserve the wetland complex of utmost importance for migrating birds, it is necessary to develop the cross border Ramsar territory and to grant the corresponding status to the Russian part of the Neman delta.

Download the article

Some Biotic Reactions to Climate Change in the Forest Landscape of the Caspian-Baltic Watershed

Abstract

The article considers some biotic reactions to climatic transformation on the basis of the research conducted in 1980—2006 in the primary ecosystems of southern Taiga on the Central Russian Plain. The change of structure, diversity and productivity of small mammal communities are connected to climatic trends, extreme and catastrophic climatic phenomena.

Download the article

Biology

Seasonal Larva Number Dynamics and Settlement of Juvenile Zebra Mussel (Dreissena polymorpha Pallas) in the Prybrezhny Quarry (the Kaliningrad region)

Abstract

The article analyses the seasonal dynamics of zebra mussel (Dreissena polymorpha Pallas), larva length composition and juvenile recruitment in perennial natural colonies in the Prybrezhny Querry (the Kaliningrad region). In 2002, zebra mussel larvae were found in plankton from the second part of July till the end of August. The peaks of abundance were registered in the middle of July and in the beginning of August. The larvae accounted for 33% of the total zooplankton abundance. The size of larvae varied from 100 to 375 μm. The beginning of the juvenile settlement was observed in July. Colony mud accumulation is considered having a negative effect on successful settlement and survival of juveniles.

Download the article

Ontogenetic Dynamics of Hydrocortisone Quantitative Content of the Common Octopus Octopus vulgaris, Lamark (Cephalopoda: Octopodidae)

Abstract

The article describes the quantitative content dynamics of the hydrocortisone steroid hormone in different organs and tissues in the course of the common octopus ontogenesis. The author detects general patterns of its quantitative distribution in the octopus organism and formulates a hypothesis on the functional significance of hydrocortisone in the examined tissues of mollusks.
Hydrocortisone level is one of the most important organizers of general adaptation syndrome in the organisms of vertebrates under different forms of stress. It may be also used as an indicator of organism state of invertebrate hydrobionts in biotesting and bioindication of water biocenoses.

Download the article

Cytogenetic Structure of Chironomus balatonicus Devai et al. Population in the Vistula Lagoon of the Baltic Sea

Abstract

The analysis of Ch. balatonicus population cytogenetic structure shows that all seven chromosomal arms are polymorphous, the most polymorhous one is arm D, which was presented by four chromosome band sequences. Standard sequences as well as their zygotic and genome combinations prevail in the population. The presence of balD5, balD7 sequences in the population
karyofund earlier recorded only in eastern populations and three new inversion band sequences (balB8, balF8, bal(EF)X) characterizes the cytogenetic structure as partly unique, formed under specific conditions of brackish water reservoir.

Download the article

Biological Resources and their Use

Ontogenesis of Dracocephalum nutans L. and Dracocephalum grandiflorum L. in the Alma-Ata region

Abstract

The article is dedicated to the research on ontogenesis development of the Dracocephalum nutans L. and Dracocephalum grandiflorum L. species in the Alma-Ata region. The research results include the following: growth and development rhythm of the species corresponds to the natural climatic fluctuations of the new environment; i. e. vegetation period coincides with the period
of stable positive air temperatures in the Alma-Ata region. The vegetation period of Dracocephalum nutans L. lasts 160—170 days; Dracocephalum grandiflorum L. — 140—150 days.

Download the article

Soil Biology

Anniversaries