Seasonal chlorophyll evolution in needles of WILD pine (Pinus
212, Tetouan, Maroc. The forest of Pinus sylvestris located in Sierra Nevada (Granada, Spain) has a great ecological value, since as var. nevadensis represents ...
2 ème Colloque International : Le Genévrier Thurifère et les Forêts d’altitude dans les montagnes du pourtour méditerranéen
Seasonal chlorophyll evolution in needles of WILD pine (Pinus sylvestris L. var. nevadensis Christ.) as determined by temperature, photoperiod and relative water content S. BARRIGA1, A. BOUJENNA2 AND L.F. GARCIA DEL MORAL1 1. Dpto. Biología Vegetal, Facultad de Ciencias, Universidad de Granada, 18071 Granada. 2. Dep. Biologie, Faculté des Sciences, Université Abdel Malek Esaadi, B.P. 212, Tetouan, Maroc
The forest of Pinus sylvestris located in Sierra Nevada (Granada, Spain) has a great ecological value, since as var. nevadensis represents the southern limit of this specie in Europe. During a complete seasonal cycle, beginning in October, and at intervals of approximately 15 days, the content of chlorophylls (a, b and total) has been measured in needles sampled from two orientations (N and S) in pines situated at 1700 m above sea level. Climatic variables were obtained by means of a meteorological station located in the area. The results indicate that the quantity of chlorophyll varied significantly along the year, presenting the minimum value during the month of February and the maximum during August. Chlorophyll concentration was always superior in the needles sampled at N orientation, although during the months of May and June, the quantity of chlorophyll was equaled in both orientations. Finally, a model of multiple regression (R=0.871 * * *, n=18) explained the seasonal variation of the content of chlorophylls in wild pine in Mediterranean forest as a function of photoperiod, temperature and relative water content of the needles.
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and alpine meadows, just below the rock limit. Livestock (cows, sheep ..... especially the high lysine content (an essential amino acid for body growth in pigs), ...
The hydraulic properties of Pinus pinea, Pinus halepensis and Tetraclinis articulata were studied in a .... plants living in sandy substrates will show a greater.
Jul 26, 2005 - Alpkem Autoanalyser. To analyse Chl a, different volumes of water were filtered in subdued light onto Whatman GF/F filters, in triplicate.
properties of P. taeda growing on sand versus loam were adjusted to differences in soil porosity. Trees were simi- lar in age and genetic background, and the ...
Dec 23, 2013 - composition and size structure of estuarine copepods. So it .... 07:30. 08:15 community structure of copepods in coleroon coastal waters. 523 ...... Madhupratap M. (1999) Free living copepods of the Arabian Sea: distri- butions and ...
Jun 3, 2016 - simulation of ambient changes at the original location. .... and drought period (Table 1). Finally, the ... this period survival rates were stable.
The North Water (NOW), located between Greenland and Ellesmere. Island (Canadian Arctic), is one of the largest and most productive polynyas in the Northern ...
Jun 3, 2011 - high phenotypic plasticity of the populations from mesic origins. In the mesic site, .... determine the best provenances of the species. The plant-.
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biology and ecology of the Canary Island flora and fauna. ...... production and life-history variation in vascular plants. .... dynamics in the Canary Island pine.
Birth, death, fear. Instincts end of the fable of Darwinism. Biology overrules civilisation. Pure unconditioned emotions. Symbiotic biodiversity. Respect the wild.
Kalle Parvinen1 . We study the evolution of dispersal in a structured metapopulation model. The metapopulation consists of a large number of local populations ...
twicklung. Diploma thesis. University of Hamburg. [3] Wehde, H., (2001): Phytokonvektion im offenen Ozean; Feldexperi- mente und numerische Prozessstudien.
The literature on vessel evolution suggests the hypothesis that vessel-bearing ... and taxa with transitional vessel elements that have primitive perforation plate ...
Materials and methods. Study site and plant material .... two branches of the same âedgeâ tree was measured by the thermoelectric heat pulse method, with a ...
of the plankton suspension plus 2.5 l natural lake water from the same ... was created for each treatment (control and atrazine) by collecting ..... and wastewater.
to January, in March and April there was a simple relationship between xylem ... The control plants showed no effect of temperature on pres- sure except for a ...
May 22, 2000 - and isoproturon along a contamination gradient. Ursula Dorigo ... composition of the communities sampled was assessed by microscopy and by HPLC pigment analysis. ..... impossible, even by co-eluting the sample with the.
first example of vertical migrations with temperature (as opposed to rainfall) of any tropical ... study has importance for future ecological studies, as well as biodiversity assess- ments and ..... In most cases (93%), the depth of caecilians could
