Penrith Lakes Scheme is concerned with the rehabilitation of gravel pits to create a system of large recreational lakes. A potential submerged macrophyte problem has been identified in an existing man-made lake.
The need to control the macrophytes is dependent on the proposed end use of the lakes and the potential area of invasion.
A variety of control options were assessed. Plastic blankets were tested to determine their effectiveness in controlling macrophyte growth specifically in swimming and boat access areas. Comparisons of clear, black and black woven blankets were conducted. Experiments revealed that 90% of the plants under the black and black woven blankets died within six weeks. Under clear blankets plants were reduced by between 20%-90%.
Analysis showed that significant interactions occurred between sites and treatments and times, from which it can be inferred that none are independent of each other. Success in the reduction of macrophytes appears dependent on such factors as plant species, sediment accumulation and light reduction.
Paruterina candelabraria was found in 4 out of 40 rodents collected in gravel pits near St. Lupicin, Mulvihill, Wasagaming, and Lockport, Manitoba. The hosts were Microtus pennsylvanicus and Peromyscus maniculatus. Cladotaenia globifera was found in 1 out of 15 M. pennsylvanicus collected near Bissett, Manitoba.
The present article focuses on artefacts made of antlers with holes drilled for the haft, both those available in physical collections and those known only from archaeological literature. This category of items is held by a number of central and regional museums in Belarus, as well as in private collections. Such ‘dispersion’ of the items makes their study problematic. Until now, no comprehensive study of antler artefacts with drilled holes from gravel pits located in Smarhon has been conducted. Publications have so far considered only the specimens that are most representative from the point of view of comparative typology. Michal Chernyavskiy and Piotr Kalinovskiy invariably associated tools with drilled holes with the Mesolithic period. However, this group of tools is more diverse and chronologically complicated than previously thought. The authors of the present article propose a new typological scheme for this item category which is part of a pan-European cultural and chronological context based on a complex analysis of antler artefacts with drilled holes.
Dry grassland and thermophilous forest margin species in the flora of gravel pits of the Wysoczyzna Siedlecka plateau