Hemiptera plant. Phloem sap, which has a higher concentration of sugars and nitrogen, is under positive pressure unlike the more dilute xylem sap. Most of the Sternorrhyncha and a number of Auchenorrhynchan groups feed on phloem. Phloem feeding is common in the Fulgoromorpha, most Cicadellidae and in the Heteroptera. The Typhlocybine Cicadellids specialize in feeding on non-vascular mesophyll tissue of leaves, which is more nutritious than the leaf epidermis. Most Heteroptera also feed on mesophyll tissue where they are more likely to encounter defensive secondary plant metabolites which often leads to the evolution of host specificity. Obligate xylem feeding is a
Tonlé Sap Biosphere Reserve inter-species breeding amongst the crocodiles found in the floating farms on the western part of the Lake in and around Prek Toal. In 2001, the Tonlé Sap Biosphere Reserve (TSBR) of Cambodia was established by Royal Decree of the government of Cambodia to fulfil 3 key functions. These are: a) a conservation function to contribute to the conservation of biological diversity, landscapes, and ecosystem, including genetic resources, plant, fishery and animal species, and to the restoration of the essential character of the environment and habitat of biodiversity; b) a development function to foster sustainable development of ecology, environment, economy, society,