The diet of fennec fox has been investigated for the first time from scats collected during one year in three localities of the north-eastern Algerian Sahara: Guemar and Sanderouce (near Oued Souf) and Bamendil (near Ouargla). In Guemar, 160 items in 20 scats were identified including 93 insects (58.1 %), 11 plant fragments (6.9 %) and 38 dates of Phoenix dactylifera (23.8 %). In terms of biomass, with 37.4 % plant material was the most abundant, followed by birds (29.9 %) and mammals (14.9 %). In Sanderouce, 491 items in 37 scats were identified including 377 insects (77.1 %), 10 plant fragments (2.0 %) and 29 dates (5.9 %). In terms of biomass mammals (56.6 %) were far more abundant than squamates (15.4 %) and vegetal food (12.8 %). In Bamendil, 1246 items in 57 scats were identified; insects were the most numerous (87.9 %) followed by mammals (only 3.7 %), however the biomass of mammals was the highest (63.5 %) followed by birds (19.8 %) and insects (5.5 %). As was suggested by behavioural records, the diet of the fennec fox was mainly carnivorous, but included a significant amount of vegetal items, particularly dates collected in oases.
Podél středové cesty zahrady pískovcové sochy představující Roční doby - stojící nahá mladá žena, u pravé nohy rostlina., Blažíček 1959#., and Poche 1978#, 171.
a1_Different parameters that vary during leaf development may be affected by light intensity. To study the influence of different light intensities on primary leaf senescence, sunflower (Helianthus annuus L.) plants were grown for 50 days under two photon flux density (PFD) conditions, namely high irradiance (HI) at 350 μmol(photon) m-2 s-1 and low irradiance (LI) at 125 μmol(photon) m-2 s-1. Plants grown under HI exhibited greater specific leaf mass referred to dry mass, leaf area and soluble protein at the beginning of the leaf development. This might have resulted from the increased CO2 fixation rate observed in HI plants, during early development of primary leaves. Chlorophyll a and b contents in HI plants were lower than in LI plants in young leaves. By contrast, the carotenoid content was significantly higher in HI plants. Glucose concentration increased with the leaf age in both treatments (HI and LI), while the starch content decreased sharply in HI plants, but only slightly in LI plants. Glucose contents were higher in HI plants than in LI plants; the differences were statistically significant (p<0.05) mainly at the beginning of the leaf senescence. On the other hand, starch contents were higher in HI plants than in LI plants, throughout the whole leaf development period. Nitrate reductase (NR) activity decreased with leaf ageing in both treatments. However, the NR activation state was higher during early leaf development and decreased more markedly in senescent leaves in plants grown under HI. GS activity also decreased during sunflower leaf ageing under both PFD conditions, but HI plants showed higher GS activities than LI plants. Aminating and deaminating activities of glutamate dehydrogenase (GDH) peaked at 50 days (senescent leaves). GDH deaminating activity increased 5-fold during the leaf development in HI plants, but only 2-fold in LI plants., a2_ The plants grown under HI exhibited considerable oxidative stress in vivo during the leaf senescence, as revealed by the substantial H2O2 accumulation and the sharply decrease in the antioxidant enzymes, catalase and ascorbate peroxidase, in comparison with LI plants. Probably, systemic signals triggered by a high PFD caused early senescence and diminished oxidative protection in primary leaves of sunflower plants as a result., L. De la Mata ... [et al.]., and Obsahuje bibliografii