Leaf fall in white birch (Betula pubescens) is independent of leaf asymmetry

2004 ◽  
Vol 82 (7) ◽  
pp. 910-913 ◽  
Author(s):  
Mikhail V Kozlov
Keyword(s):  
Life Span ◽  
Fluctuating Asymmetry ◽  
Betula Pubescens ◽  
Leaf Longevity ◽  
Leaf Life Span ◽  
Leaf Fall ◽  
White Birch ◽  
Modular Organisms ◽  
Large Trees ◽  
Betula Pubescens Ehrh

Developmental instability, reflected by high fluctuating asymmetry, frequently indicates low fitness of an organism. However, it remains unknown whether in modular organisms, like plants, asymmetry is linked with performance at the level of individual metamers. To explore within-tree relationships between fluctuating asymmetry and leaf longevity, each third day between 22 August and 10 October 2001, leaves were collected under two large trees of white birch (Betula pubescens Ehrh.). The date of leaf fall (a proxy of leaf life-span) was not linked with either leaf asymmetry or damage imposed by chewing insects. Similarly, leaves collected under 10 birches at the end of leaf fall in 2002 demonstrated the same asymmetry as leaves collected at the beginning of leaf fall. These results suggest that leaf longevity in white birch is independent of leaf asymmetry.Key words: leaf longevity, fluctuating asymmetry, within-tree variation.

Variations in the effects of local foliar damage on life span of individual leaves of downy birch (Betula pubescens)

Botany ◽  
2014 ◽  
Vol 92 (7) ◽  
pp. 477-484 ◽  
Author(s):  
Mikhail V. Kozlov ◽  
Elena L. Zvereva
Keyword(s):  
Life Span ◽  
Mechanical Damage ◽  
Betula Pubescens ◽  
Leaf Life Span ◽  
Feeding Guild ◽  
Mature Leaves ◽  
Sources Of Variation ◽  
Downy Birch ◽  
Herbivore Species ◽  
Betula Pubescens Ehrh

Although the premature abscission of leaves damaged by herbivores has been discovered decades ago, the reduction in leaf life span caused by herbivory remains poorly documented, and the sources of variation in the magnitude of this effect have only rarely been studied. We aimed at exploring the effects of several herbivore species (at their background densities) and simulated herbivory on the leaf life span of downy birch, Betula pubescens Ehrh. Leaves damaged by herbivores abscised on average 12.6 days earlier and punched leaves 3.5 days earlier than the intact leaves of the control shoots. Different herbivores reduced the life span of the birch leaves from 0% to 27% depending on the intensity and timing of the damage but not on the insect feeding guild. The reduction in leaf life span was greater when the damage was imposed on expanding and growing leaves compared with mature leaves. However, the effect of herbivore species remained significant after accounting for intensity and timing of damage. This fact, together with greater reduction in leaf life span due to natural herbivory compared with mechanical damage, indicates that premature abscission in response to injury is considerably enhanced by insect-specific elicitors.

scholarly journals Fluctuating Asymmetry of Leaves of Betula pubescens Ehrh. for Assessment of Pollution of the Urban Environment of the Kola North

2020 ◽  
Author(s):  
Natalya Saltan ◽  
Ekaterina Svyatkovskaya ◽  
Nadezhda Trostenyuk
Keyword(s):  
Fluctuating Asymmetry ◽  
Significant Proportion ◽  
Urban Ecosystems ◽  
Betula Pubescens ◽  
The State ◽  
Stress Factors ◽  
Dead Trees ◽  
Murmansk Region ◽  
Betula Pubescens Ehrh ◽  
High Level

The results of determining the fluctuating asymmetry (FA) index of Betula pubescens leaves as well as the state of birches in general, as an aboriginal species in the Murmansk region to assess the pollution of urban ecosystems of the Kola North (Murmansk, Apatity, Olenegorsk, Polyarnye Zori, Kandalaksha) in the zone of influence of railway transport have been presented in the article. It has been shown that the most weakened birches grow in Kandalaksha and Olenegorsk, while in Kandalaksha area, there are more than 10% of dead trees. It has been revealed that the highest FA index which characterizes the critical state of plants and the high level of environmental pollution is observed in Olenegorsk. The increased level of FA has also been in Kandalaksha and Polyarnye Zori. The comparative analysis of the state of plants and FA index showed existence of functional interrelation only in Kandalaksha and Olenegorsk when with a significant proportion of weakened trees the indicator of FA is the highest. Due to the fact that the increase in the level of FA is influenced by stress factors caused not only by pollution, the method of assessing the quality of the environment by the fluctuating asymmetry should be used in complex with other studies.

scholarly journals Leaf life span and the leaf economic spectrum in the context of whole plant architecture

2014 ◽  
Vol 102 (2) ◽  
pp. 328-336 ◽  
Author(s):  
Erika J. Edwards ◽  
David S. Chatelet ◽  
Lawren Sack ◽  
Michael J. Donoghue
Keyword(s):  
Life Span ◽  
Plant Architecture ◽  
Leaf Life Span ◽  
Whole Plant ◽  
Leaf Economic Spectrum

scholarly journals Shading effects on leaf life span and functional traits in the widespread species Enterolobium contortisiliquum (Vell.) Morong

2017 ◽  
Vol 39 (1) ◽  
pp. 113 ◽  
Author(s):  
João Paulo Souza ◽  
Nayara Magry Jesus Melo ◽  
Alessandro Dias Halfed ◽  
Jéssica Naiara Reis
Keyword(s):  
Life Span ◽  
Functional Traits ◽  
Leaf Life Span ◽  
Widespread Species ◽  
Shading Effects

Taxonomy of infraspecific variation in Betula pubescens Ehrh., with particular reference to the Scottish Highlands

1984 ◽  
Vol 85 (1-2) ◽  
pp. 13-26 ◽  
Author(s):  
A. S. Gardiner
Keyword(s):  
Multivariate Analysis ◽  
High Frequency ◽  
Betula Pubescens ◽  
Infraspecific Variation ◽  
Scottish Highlands ◽  
Betula Pubescens Ehrh

SynopsisThe variability of the pubescent birch and the probable existence of hybrids between it and two other birches make it a difficult species to classify at an infraspecific level. To some extent, the variation is geographical and to cover its distribution, three subspecies are proposed by the authors of Flora Europaea, sspp. pubescens, carpatica and tortuosa. Two subspecies are recognized in Britain, namely ssp. pubescens and ssp. odorata, but some confusion has arisen through the undetermined relationships between sspp. odorata, carpatica and tortuosa. The rejection of ssp. odorata is proposed as its application, in this case, differs from that intended by J. M. Bechstein, the original authority. An examination of the literature indicates that ssp. tortuosa and ssp. carpatica are probably indistinguishable (a conclusion supported by multivariate analysis) and that the epithet tortuosa can be applied to both taxa. The pubescent birch in the Scottish Highlands may be referred to ssp. tortuosa and, in addition, the high frequency of small-leafed individuals in some populations in the northwest and at higher altitudes, justifies the further distinction of var. microphylla Hartman.

Influence of Copper Oxide and Silver Nanoparticles on Microclonal Sprouts of Downy Birch (Betula pubescens Ehrh.)

2020 ◽  
Vol 15 (7-8) ◽  
pp. 476-482
Author(s):  
P. M. Evlakov ◽  
O. A. Fedorova ◽  
T. A. Grodetskaya ◽  
O. V. Zakharova ◽  
A. A. Gusev ◽  
...  
Keyword(s):  
Silver Nanoparticles ◽  
Copper Oxide ◽  
Betula Pubescens ◽  
Downy Birch ◽  
Betula Pubescens Ehrh

New cyclic diarylheptanoids from the false heartwood of Betula pubescens Ehrh

2021 ◽  
pp. 1-9
Author(s):  
Anastasiia O. Ponkratova ◽  
Dmitry N. Vedernikov ◽  
Andrei K. Whaley ◽  
Maria N. Kuncova ◽  
Sergey N. Smirnov ◽  
...  
Keyword(s):  
Betula Pubescens ◽  
Betula Pubescens Ehrh

Altitudinal Zonation of Geometrid Larvae (Lep.) during a Mass Occurrence on Birch at Sogndal, Western Norway, I967

1972 ◽  
Vol 3 (1) ◽  
pp. 69-74 ◽  
Author(s):  
Sigmund Hagvar
Keyword(s):  
Maximum Density ◽  
Betula Pubescens ◽  
Birch Wood ◽  
Altitudinal Zonation ◽  
Western Norway ◽  
Mass Occurrence ◽  
Betula Pubescens Ehrh ◽  
Different Altitudes ◽  
Made In

AbstractLarvae of Geometridae (Lep.) attacked the birch wood (Betula pubescens Ehrh.) in the mountain slopes near Sogndal, Sogn, in I966 and I967. Collecting of larvae were made in I967 by sweep-netting on five stations at different altitudes up to timber line at 900 m a.s. The maximum density of Operophthera sp., at about 300 m a.s., was estimated to be about five times higher than the maximum density of Oporinia autumnata Bkh. just below the timber line. A horizontal, brownish belt, where the trees were heavily defoliated, extended from approximately 250 to 350 m a.s. The trees near the timber line were not so heavily defoliated. The least defoliated trees were found at about 650-700 m a.s., in the overlapping zone of the two geometrid species. Operophthera sp. was found at all altitudes, while O. autumnata occurred only in the upper half of the birch wood. Erannis aurantiaria Hb. and E. defoliaria Cl. also occurred at all altitudes. The former preferred the lower part of the birch wood, and was always present in densities lower than O. autumnata's highest density. Only a few larvae of E. defoliaria were found, without showing any altitudinal preference.

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