Specific features of linear growth influencing morphometric parameters of the shell in Margaritifera margaritifera (Bivalvia: Margaritiferidae)

This paper presents phenological development of seven introduced species of the genus Crataegus L. in the Kola North. The studied hawthorn species are characterized by early onset of vegetation, short duration of linear growth of shoots and a short vegetation period. Timely completion of growth processes and lignification of shoots contribute to successful adaptation of Crataegus plants under the conditions of introduction. The authors study morphometric parameters of flowers and inflorescences, decorative qualities, size and density of the inflorescence, the number of flowers in the inflorescence, the diameter of the flowers. The most decorative species of Crataegus during flowering are selected. The plants of the studied hawthorns are characterized by the average duration of the prefloral period, annual / irregular flowering. The most decorative species during flowering are the ones with larger flowers and inflorescences: C . maximoviczii and C . dahurica . Species with a large number of flowers are characterized by a denser inflorescence. Species with smaller flowers form smaller inflorescences and vice versa. In the conditions of the Kola Subarctic, the number of flowers in the inflorescence depends mainly on the specific features. C . maximoviczii is recommended for gardening in northern cities.

Download Full-text

Growth biorhythms in the freshwater pearl mussel Margaritifera margaritifera (Bivalvia, Margaritiferidae). Livojoki river population (Karelia)

Knowledge and Management of Aquatic Ecosystems ◽

10.1051/kmae/2018033 ◽

2018 ◽

pp. 44 ◽

Cited By ~ 2

Author(s):

Alexey A. Zotin ◽

Svetlana A. Murzina ◽

Evgeny P. Ieshko

Keyword(s):

Growth Rates ◽

Linear Growth ◽

Margaritifera Margaritifera ◽

Pearl Mussel ◽

River Population ◽

Freshwater Pearl Mussel ◽

Average Value ◽

Growth Deceleration

Individual linear growth rates were studied in freshwater pearl mussels Margaritifera margaritifera from the Livojoki River. Growth deceleration coefficients were shown to vary widely and differ significantly among individuals. The average value of the growth deceleration coefficient for the population is 0.060. The growth of mussels in the Livojoki River is accompanied by two regular biorhythms. These biorhythm periods were roughly constant both through an individual's ontogeny and among mussels, their average periods were 7.16 and 4.09 years. We discuss the possibility that these biorhythms are of thermodynamic nature.

Download Full-text

Manifestation and variability of biometric characteristics in line-parental components and hybrids of maize using different genetic peninsular

Faktori eksperimental'noi evolucii organizmiv ◽

10.7124/feeo.v29.1402 ◽

2021 ◽

Vol 29 ◽

pp. 29-34

Author(s):

R. A. Vozhegova ◽

Yu.O. Lavrynenko ◽

T.Y. Marchenko ◽

V.V. Bazalii

Keyword(s):

Grain Yield ◽

Plant Height ◽

Linear Growth ◽

Morphometric Parameters ◽

Early Group ◽

Biometric Parameters ◽

Irrigation Methods ◽

Yield Level ◽

General Scientific ◽

Initial Forms

Aim. To establish the manifestation and variability of the trait "plant height" in the lines-parent components and hybrids of corn using different genetic plasmas, to determine the level of heterosis in newly created test crosses and to determine the influence of morphometric parameters on grain yield under irrigation. Methods. General scientific, special, comparative-analytical, regression, information-logical analysis and mathematical modeling. Results. The manifestation and variability of traits "plant height" and "height of cob attachment" in the lines - parent components and hybrids of corn with the use of different genetic plasmas were established. The level of heterosis in newly created test crosses under irrigation conditions was determined. The dependences of biometric parameters and their correlation with grain yield in the test of hybrids obtained with the participation of newly created initial forms of different embryonic plasmas were established. Conclusions. The ratio of plant height of hybrids by maturity groups and yield level showed that for the middle-early group, in the phase of cessation of linear growth, the optimal plant height is 235–265 cm, grain yield is 12.98–13.81 t/ha; for the middle-ripe group - 255–257 cm with grain yield at the level of 15.17–15.82 t/ha. For medium-late hybrids, the optimal plant height to ensure the highest grain yield (over 15 t/ha) is in the range from 270 to 280 cm. Keywords: parental lines, genetic plasmas, hybrids, maize.

Download Full-text

Irregularity of the linear growth of the Margaritifera margaritifera (Bivalvia: Margaritiferidae) population of the Nemina River, Karelia

Biology Bulletin ◽

10.1134/s1062359016040142 ◽

2016 ◽

Vol 43 (4) ◽

pp. 359-365

Author(s):

A. A. Zotin ◽

E. P. Ieshko

Keyword(s):

Linear Growth ◽

Margaritifera Margaritifera

Download Full-text

CHANGES IN MORPHOMETRIC PARAMETERS OF THE DIDACNE SHELLS OF THE TRIGONOIDES GROUP IN ONTOGENESIS

Herald of Daghestan Scientific Center of Russian Academy of Science ◽

10.31029/vestdnc81/2 ◽

2021 ◽

pp. 12-17

Author(s):

Marina Vladimirovna KHLOPKOVA

Keyword(s):

Linear Growth ◽

Morphometric Parameters ◽

Optimal Temperature ◽

Temperature Conditions

As a result of the study the latitudinal variability of the allometric and linear growth of the didacnas of the trigonoides group has been established. The trends of increasing the elongation coefficient with approach to the optimal temperature conditions have been recorded while the convexity coefficients eventually decrease.

Download Full-text