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Tanaka, H. (1967). On the change of composition of aquatic insects
resulting from difference in mesh size of stream bottom samplers.
(In Japanese). Bull. Freshwat. Fish. Res. Lab., Tokyo, 17, 1-6.
[Compares catches with Surber sampler, using nets of different meshsize]
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Thamdrup, H.M. (1938). Der van Veen-Bodengreifer. Vergleichsversuche
Uber die Leistungsfahigkeit des van Veen und des Petersen Bodengreifers.
(The van Veen bottom-grab. Comparison of the efficiency of the van Veen
and Petersen bottom grabs) (In German). J. Cons. perm. int. Explor.
Mer, 13, 206-212. [Van Veen found to have better closing mechanism
and caught more invertebrates] Mar
Thayer, G.W., Williams, R.B., Price, T.J. & Colby, D.R. (1975). A large
corer for quantitatively sampling benthos in shallow water. Limnol.
Oceanogr. 20, 474-80. [Compares their corer with a van Veen grab]
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Ursin, E. (1954). Efficiency of marine bottom samplers of the van Veen
and Petersen types. Meddr Danm. Fisk.-og Havunders. N.S. 1, (7), 8 pp.
[Compares van Veen and Petersen grabs, van Veen generally better]
Mar
Ursin, E. (1956). Efficiency of marine bottom samplers with special
reference to the Knudsen sampler. Meddr Danm. Fisk.-og Havunders.
N.S. 1, (14), 6 pp. [Compares Knudsen large-diameter corer with
van Veen grab; caught similar numbers of invertebrates but Knudsen
caught more species] Mar
Wasmund, E. (1932). Entwicklung und Verbesserung der Entnahmeapparatur
fur Bodenproben unter Wasser. (Development and improvement of collecting
apparatus for bottom sampling under water) (In German). Arch. Hydrobiol.
2, 646-662. [Compares Birge-Ekman grab, Monaco grab (Leger 1904) and
Ruttner's scissor grab] FW
Weber, C.I. (Ed.) (1973). Biological field and laboratory methods for
measuring the quality of surface waters and effluents. Environmental
Monitoring Series, U.S. Environmental Protection Agency. EPA 670/4-73-
001. [Compares Ponar, Petersen and Ekman grabs, Surber sampler, K-B
corer, stovepipe corer (Wilding 1940) using data collected by various
workers] FW
Wigley, R.L. (1967). Comparative efficiencies of van Veen and Smith-
Mclntyre grab samplers as revealed by motion pictures. Ecology, 48,
168-169. [Large shock wave created by van Veen grab whilst it
descended to the bottom, but only a weak oscillatory shock wave was
caused by Smith-Mclntyre grab] Mar
Zelt, K.A. & Clifford, H.F. (1972). Assessment of two mesh sizes for
interpreting life-cycles, standing crop, and percentage composition of
stream insects. Freshwat. Biol. 2, 259-269. [Compares Surber sampler
with pond net and also compares catches with different mesh sizes]
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