Intrathalline and size-dependent patterns of activity in Lasallia pustulata and their possible consequences for competitive interactions

被引:23
作者
Hestmark, G
Schroeter, B
Kappen, L
机构
[1] CHRISTIAN ALBRECHTS UNIV KIEL,INST BOT,D-24098 KIEL,GERMANY
[2] CHRISTIAN ALBRECHTS UNIV KIEL,INST POLAROKOL,D-24098 KIEL,GERMANY
关键词
competition; intrathalline activity; lichens; overlap; size-dependent performance;
D O I
10.1046/j.1365-2435.1997.00086.x
中图分类号
Q14 [生态学(生物生态学)];
学科分类号
071012 ; 0713 ;
摘要
1. In dense populations of the saxicolous lichen Lasallia pustulata the margins of adjacent thalli overlap each other in intraspecific competition for space and light, 2. In situ non-destructive monitoring of hydration-dependent potential photosynthetic activity by modulated fluorescence systems in different parts of the thallus shows that the activity is structured by a centre-to-margin gradient, with the centre of the thallus remaining active for substantially longer periods than the margins when the thalli dry up after being activated by wetting. The pattern reflects the water status of different parts of the thallus: the margins which are thin and exposed dry up first, 3. The activity pattern within individual lichen thalli suggests that marginal overlapping between neighbours may have a less detrimental effect on the shadowed individuals than expected from a pure consideration of the amount of area shadowed, Because the centre of the lichen thallus is active for longer periods, shadowing of this region may possibly be more harmful per area unit than an overlap at the less active margins. 4. Larger thalli are active for substantially longer periods than small ones, Even the margins of larger thalli tend to be active for a longer period than the centre of small thalli.
引用
收藏
页码:318 / 322
页数:5
相关论文
共 27 条
[1]   A MODEL FOR GROWTH AND SELF-THINNING IN EVEN-AGED MONOCULTURES OF PLANTS [J].
AIKMAN, DP ;
WATKINSON, AR .
ANNALS OF BOTANY, 1980, 45 (04) :419-427
[2]  
ARMSTRONG RA, 1976, LICHENOLOGY PROGR PR, P309
[3]   DETERMINATION OF THE QUANTUM EFFICIENCY OF PHOTOSYSTEM-II AND OF NONPHOTOCHEMICAL QUENCHING OF CHLOROPHYLL FLUORESCENCE IN THE FIELD [J].
BILGER, W ;
SCHREIBER, U ;
BOCK, M .
OECOLOGIA, 1995, 102 (04) :425-432
[4]   SPATIAL STOCHASTIC-MODEL OF INTER-PLANT COMPETITION [J].
DIGGLE, PJ .
JOURNAL OF APPLIED PROBABILITY, 1976, 13 (04) :662-671
[5]   A MODEL OF INTERFERENCE WITHIN PLANT MONOCULTURES [J].
FIRBANK, LG ;
WATKINSON, AR .
JOURNAL OF THEORETICAL BIOLOGY, 1985, 116 (02) :291-311
[6]   BIMODALITY IN EVEN-AGED PLANT MONOCULTURES [J].
GATES, DJ .
JOURNAL OF THEORETICAL BIOLOGY, 1978, 71 (04) :525-540
[7]   DYNAMICS OF SIZE STRUCTURE IN PLANT-POPULATIONS [J].
HARA, T .
TRENDS IN ECOLOGY & EVOLUTION, 1988, 3 (06) :129-133
[8]   SEX, SIZE, COMPETITION AND ESCAPE - STRATEGIES OF REPRODUCTION AND DISPERSAL IN LASALLIA-PUSTULATA (UMBILICARIACEAE, ASCOMYCETES) [J].
HESTMARK, G .
OECOLOGIA, 1992, 92 (03) :305-312
[9]   DEVELOPMENTAL BIOLOGY OF LICHENS [J].
HONEGGER, R .
NEW PHYTOLOGIST, 1993, 125 (04) :659-677
[10]   Field measurements of photosynthesis of umbilicarious lichens in winter [J].
Kappen, L ;
Schroeter, B ;
Hestmark, G ;
Winkler, JB .
BOTANICA ACTA, 1996, 109 (04) :292-298