Gershon N. Herbst

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Silver maple (Acer saccharinum) and cottonwood (Populus deltoides) leaves were incubated in cages excluding (controls) or containing (experimental) detritivores for periods of up to 123 days. Experimental cages contained either the cranefly larvae Tipula abdominalis, the amphipod Gammarus pseudolimnaeus or the caddisfly Pycnopsyche guttifer. Differences in(More)
The relationship between invertebrate densities, current velocity and water depth was studied in the Dan River, northern Israel. Maximum current preferences ranged from 5–120 cm sec−1, and depth preferences ranged from 5–60 cm. Thirty-five taxa of invertebrates were collected by means of colonization cages. Larval and adult stages of 3 Elmidae (Coleoptera)(More)
The Dan river, a principal source of the Jordan River, Israel, is unusually constant in discharge (∼8 m3·s−1) and water temperature (15–16 °C). The Jordan headwaters constitute the southernmost oasis of a palearctic north temperate fauna, and presumably the very constancy of the Dan contributes to its important role as a regional refuge. However, little is(More)
River Dan is the largest of the headwater rivers of the Jordan. The karstic exsurgence of the Dan has a seasonally stable output, a long stretch of strongly turbulent flow, stable temperature around 15.5°C and high oxygen saturation. A total of 156 taxa, mainly at the species level, were identified from the river. These species are almost exclusively of(More)
Ten amphipod (Crustacea) species from the inland waters of Israel and Sinai have been identified (Gammarus syriacus, G. pseudosyriacus, Echinogammarus n. sp., E. foxi, E. veneris, Corophium orientalis, Orchestia cavimana, O. platensis, Bogidiella hebraea and Metacrangonyx n. sp.). These species display two principal distribution patterns: a marine origin(More)
A 4.5 km section of the River Dan in northern Israel was sampled at intervals of 6 weeks, between April 1983–March 1984, using standardized mesh bags. The river is characterized by extremely stable temperature and other physical and chemical conditions. The effects of a water diversion project 2400 m from the spring were investigated. The relationships(More)
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