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ecologia mediterranea, tome 29, fascicule 2, 2003, p. 139-152 VEGETATION ANALYSIS OF THE DOWN-STREAM PART OF WADI GAZA, PALESTINE ◆ Fig. 1. Location map of the study area (a) and profiles across the main channel of wadi Gaza (b) and the pond (c) located at the end of wadi showing the environmental and topographic situation of the vegetation units in the down-stream part of wadi Gaza. 141
142 ◆ M. A. SHEIKH, M. E. MADY & K. H. SHALTOUT the micro-Kjeldahl method and Na + , K + and Ca ++ cations using flame photometer (Allen et al., 1974). The vegetation data set (cover estimates of 55 plant species in 41 stands) was classified using TWINSPAN (Hill, 1979a). The type of matrix was as follows: number of samples 41, number of species 55 and length of array 735. This procedure simultaneously classifies both stands and species directly, constructing an ordered two-way table to exhibit the relationship between them as clearly as possible. Detrended correspondence Analysis (DCA) (Hill, 1979b) was used to verify the identified vegetation units. The significance of variation in the edaphic variables of the habitats and vegetation units was tested using one-way ANOVA, and the relationship between the edaphic and community variables was assessed using simple linear correlation. Stepwise multiple regression was used to analyze the relationship of the environmental and community variables with the DCA axes in order of their relative reduction of the sum of squares (the variable that reduced most of the sum of squares was entered first, followed by each of the others in descending order of relative contribution); this technique enables the elimination of insignificant variables, only those with the most important correlations with dependent variables were selected (SAS, 1985). The species richness (α-diversity) of each habitat and vegetation unit was calculated as the average number of species per stand. The species turnover (β-diversity) was calculated as the ratio between the total number of species recorded in a certain habitat or vegetation cluster and its α-diversity. Shannon-Wiener index (H = -∑ p i log p i) for the relative species evenness, and Simpson index (C = ∑ p i 2 ) for the relative concentration of species dominance were calculated for each habitat and vegetation unit based on the relative cover (p i) of species (Whittaker, 1972; Pielou, 1975). RESULTS A total of 55 species (51 % annuals and 49 % of perennials) belonging to 27 families were recorded in the various habitats of the lower-stream part of wadi Gaza (table 1). The families with the highest number of species were Asteraceae (14 = 26 %) and Poaceae (7 = 13 %). Monoregional species were highly represented in most Species Life forms Chorotype Habitat I II III IV V VI P % Species No Aizoaceae 8 11 23 22 29 34 Mesembryanthemum crystallinum L. Th Me, ES L,W,D 30 0.2 0.2 17.1 Carpobrotus edulis L. AMARYLLIDACEAE He --- W 0.4 2.4 Pancratium maritimum L. BORAGINACEAE Ge Me L 0.2 4.9 Anchusa humilis (Desf.) I. M. Johnst. CARYOPHYLLACEAE Th Me L 0.1 2.4 Silene succulenta Forssk. CHENOPODIACEAE He Me L,S 0.2 0.1 4.9 Arthrocnemum macrostachyum (L.) Moq. Th Me L,S 45 1.3 12.2 Salsola kali L. ASTERACEAE Th Cosm L,S,W,D 0.1 2.7 0.5 0.3 17 Artemisia monosperma Del. Ch SA, Me T,O 4.4 7.3 Atractylis carduus (Forssk.) C. Chr. He -- B,T,O 0.3 1.4 6.1 51.2 Centaurea ammocyanus Boiss. Th Me L,W,B 0.6 8.3 31.7 Cichorium pumilum Jacq. Th Me, IT W,B,T,O 0.1 0.2 0.2 14.6 Launaea nudicaulis (L.) Hook. fi l. He SA, IT L,T 1.0 0.4 0.5 14.6 Matricaria aurea (Loefl .) Sch. Bip. Th --- B 0.3 4.9 ecologia mediterranea, tome 29, fascicule 2, 2003
Page 1 and 2: Tome 29 Fascicule 2, 2003 ISSN 0153
Page 3 and 4: Rédacteur en chef Managing editor
Page 5 and 6: Vegetation along an elevation gradi
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Diversité génétique des populati
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Populations Code DIVERSITÉ GÉNÉT
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Figure 3. Dendrogramme établi à p
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218 ◆ M. BARBERO INTRODUCTION Une
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220 ◆ M. BARBERO frutescens, Pote
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222 ◆ M. BARBERO loppé avec, dan
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224 ◆ M. BARBERO La dégradation
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226 ◆ M. BARBERO ticum, Hepatica
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228 ◆ M. BARBERO — une unité p
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230 ◆ M. BARBERO tes crêtes de l
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234 ◆ M. BARBERO — constitution
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236 ◆ M. BARBERO Etage méso-méd
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238 ◆ M. BARBERO L’étage monta
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240 ◆ M. BARBERO Bibliographie Ce
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242 ◆ M. BARBERO CAILLIAU A., 200
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244 ◆ M. BARBERO terranéen dans
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246 ◆ M. BARBERO répartition de
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262 ◆ ANALYSES D’OUVRAGES paysa
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264 ◆ ANALYSES D’OUVRAGES tradi
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