Early Ontogeny of the Behavior of Young in Large-Billed Crows (Corvus macrorhynchos) in Their Natural Habitat

2018 ◽  
Vol 45 (8) ◽  
pp. 794-802
Author(s):  
T. A. Obozova ◽  
A. A. Smirnova ◽  
Z. A. Zorina
Keyword(s):  
Natural Habitat ◽  
Early Ontogeny ◽  
Corvus Macrorhynchos

scholarly journals ANALYSIS OF BIOLOGY AND REPRODUCTION OF SHIP STURGEON (ACIPENSER NUDIVENTRIS)

2020 ◽  
Vol 2020 (3) ◽  
pp. 50-60
Author(s):  
Victoria Bekbergenova
Keyword(s):  
Natural Habitat ◽  
Taxonomic Status ◽  
Early Ontogeny ◽  
Research Literature ◽  
Complete Disappearance ◽  
Artificial Reproduction ◽  
Fish Farms ◽  
Natural Reproduction ◽  
Private Data ◽  
Acipenser Nudiventris

The article presents the analysis of the research literature on biology, ecology, artificial and natural reproduction, behavior, nutrition and taxonomic status of ship sturgeon (Acipenser nudiventris Lovetsky, 1828) over the period 1877-2020. There are given the private data obtained during interviews with fishermen, which was published earlier. The approaches to ship artificial reproduction have been analyzed; the corresponding data from the Russian research literature and from the foreign sources are presented.Ship sturgeon is one of the most vulnerable and small in number sturgeon species in the world, the individuals of which are still found in the Balkhash-Ili basin (Kazakhstan-China) due to its invasion in 1933-1934. It should be mentioned that this is the only example of successful acclimatization of sturgeon. Ship sturgeons have the following ecological and biological characteristics: prolonged living in the mountain rivers with downstream migration into the delta and the sea coast; high rates of fertility coupled with high mortality rates in early ontogeny; a diverse diet depending on the habitat. Artificial reproduction of ship sturgeon was started in 1941 in Azerbaijani SSR. Unfortunately, the species did not receive a proper attention because of its scarcity in the natural habitat, which resulted in their complete disappearance. Today the conservation of ship species requires taking the urgent measures: forming ship broodstock, introducing it into aquaculture, clarification of reproductive biotechnology, studying the peculiarities of ship growth and maturation in the fish farms.

Effect of Iron Limitation on the Ultrastructure of Agmenellum Quadruplicatum

1981 ◽  
Vol 39 ◽  
pp. 410-411
Author(s):  
L. P. Hardie ◽  
D. L. Balkwill ◽  
S. E. Stevens
Keyword(s):  
Growth Medium ◽  
Green Alga ◽  
Natural Habitat ◽  
Iron Limitation ◽  
Natural Environments ◽  
Blue Green Alga ◽  
Marine Cyanobacterium ◽  
Natural Systems ◽  
Thin Sectioning ◽  
Agmenellum Quadruplicatum

Agmenellum quadruplicatum is a unicellular, non-nitrogen-fixing, marine cyanobacterium (blue-green alga). The ultrastructure of this organism, when grown in the laboratory with all necessary nutrients, has been characterized thoroughly. In contrast, little is known of its ultrastructure in the specific nutrient-limiting conditions typical of its natural habitat. Iron is one of the nutrients likely to limit this organism in such natural environments. It is also of great importance metabolically, being required for both photosynthesis and assimilation of nitrate. The purpose of this study was to assess the effects (if any) of iron limitation on the ultrastructure of A. quadruplicatum. It was part of a broader endeavor to elucidate the ultrastructure of cyanobacteria in natural systemsActively growing cells were placed in a growth medium containing 1% of its usual iron. The cultures were then sampled periodically for 10 days and prepared for thin sectioning TEM to assess the effects of iron limitation.

THE CLASSIFICATION OF LAND ACCORDING TO THE DEGREE OF RABBIT INFESTATION IN CENTRAL OTAGO

1987 ◽  
pp. 65-70
Author(s):  
I.G.C. Kerr ◽  
J.M. Williams ◽  
W.D. Ross ◽  
J.M. Pollard
Keyword(s):  
Carrying Capacity ◽  
Mediterranean Climate ◽  
Natural Habitat ◽  
Public Funding ◽  
Soil Survey ◽  
European Rabbit ◽  
Cultural Modification ◽  
Classification Information ◽  
Semi Arid

The European rabbit (Oryctolagus cuniculus) introduced into New Zealand in the 183Os, has consistently flourished in Central Otago, the upper Waitaki, and inland Marlborough, all areas of mediterranean climate. It has proved difficult to manage in these habitats. The 'rabbit problem' is largely confined to 105,000 ha of low producing land mostly in semi arid areas of Central Otago. No field scale modifications of the natural habitat have been successful in limiting rabbit numbers. The costs of control exceed the revenue from the land and continued public funding for control operations appears necessary. A system for classifying land according to the degree of rabbit proneness is described. Soil survey and land classification information for Central Otago is related to the distribution and density of rabbits. This intormation can be used as a basis for defining rabbit carrying capacity and consequent land use constraints and management needs. It is concluded that the natural rabbit carrying capacity of land can be defined by reference to soil survey information and cultural modification to the natural vegetation. Classification of land according to rabbit proneness is proposed as a means of identifying the need for, and allocation of, public funding tor rabbit management. Keywords: Rabbit habitat, rabbit proneness, use of rabbit prone land.

Responses of the Clam Anodonta anatina to Thermal Impact Depending on Peculiarities of Occurrence in Natural Habitat

2016 ◽  
Vol 52 (2) ◽  
pp. 71-82 ◽  
Author(s):  
G. I. Falfyshynska ◽  
L. L. Gnatyshyna ◽  
I. V. Yurchak ◽  
A. Ye. Mudra ◽  
A. Ivanina ◽  
...  
Keyword(s):  
Natural Habitat ◽  
Thermal Impact

FEATURES OF FORMATION OF THE MAIN SYSTEMS AND ORGANS IN EARLY LARVAE OF MULLETS (LIZA AURATA, RISSO, 1810)

2017 ◽  
pp. 98-106
Author(s):  
Dariya Aleksandrovna Gavrilova ◽  
Maria Pavlovna Grushko
Keyword(s):  
Nervous System ◽  
Sample Selection ◽  
Early Ontogeny ◽  
Basal Cells ◽  
The Caspian Sea ◽  
Liza Aurata ◽  
Morphological Organization ◽  
Organ Systems ◽  
Major Organ ◽  
Well Differentiated

The aim of this work was to study peculiarities of mullet morphological organization during early ontogeny. Sample selection was made on board Caspian research and development Institute of Fisheries’ research vessel in period from June to September, 2015 in Russian waters of the Caspian Sea. Larvae aged 10 days could be characterized by heterochrony in the development of major organ systems. Nervous system and sense organs were well developed. The eyeball had all membranes well-differentiated, in the retina all the layers were formed. The olfactory fossae had cells of 3 types: olfactory receptor cells, supporting cells and basal cells. There was observed intensive formation of respiratory, cardiovascular, excretory and digestive systems. The early development of the nervous system and sensory organs of the larvae indicated adaptation of mullet to active life.

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