Determinants of floristic diversity and vegetation composition on the islands of Lake Burollos, Egypt
Identifieur interne : 003517 ( Main/Exploration ); précédent : 003516; suivant : 003518Determinants of floristic diversity and vegetation composition on the islands of Lake Burollos, Egypt
Auteurs : Abdel-Hamid Khedr [Égypte, Canada] ; Jon Lovett-Doust [Canada]Source :
- Applied Vegetation Science [ 1402-2001 ] ; 2000-12.
Descripteurs français
- Wicri :
- topic : Classification.
English descriptors
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Abstract
Abstract. A floristic and environmental survey was carried out on 22 uninhabited islands (0.1‐8.4 ha) in Lake Burollos, Egypt. A total of 58 vascular plant species was recorded. The number of habitats on each island was counted. There was a positive correlation between island area and number of habitat types. Island area was significantly positively correlated with various measures of floristic diversity, including the total number of species present, and the numbers of annual, herbaceous, and shrublet species. Perennial and shrub species numbers did not differ significantly with island area. In addition to island area, elevation and soil salinity, as well as distance to the Mediterranean Sea, all contributed significantly to variation in species composition in the terrestrial habitats. Water salinity and transparency accounted for 69% of the variation in aquatic species numbers. There was a weak effect of isolation on similarity of species composition on islands.
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DOI: 10.2307/1478993
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A floristic and environmental survey was carried out on 22 uninhabited islands (0.1‐8.4 ha) in Lake Burollos, Egypt. A total of 58 vascular plant species was recorded. The number of habitats on each island was counted. There was a positive correlation between island area and number of habitat types. Island area was significantly positively correlated with various measures of floristic diversity, including the total number of species present, and the numbers of annual, herbaceous, and shrublet species. Perennial and shrub species numbers did not differ significantly with island area. In addition to island area, elevation and soil salinity, as well as distance to the Mediterranean Sea, all contributed significantly to variation in species composition in the terrestrial habitats. Water salinity and transparency accounted for 69% of the variation in aquatic species numbers. 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