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A Surface-Associated Activity Trap for Capturing Water-Surface and Aquatic Invertebrates in Wetlands

Mark A. Hanson1, Christiane C. Roy2,5, Ned H. Euliss, Jr.3,
Kyle D. Zimmer2, Michael R. Riggs4,6, and Malcolm G. Butler2


Abstract: We developed a surface-associated activity trap (SAT) for sampling aquatic invertebrates in wetlands. We compared performance of this trap with that of a conventional activity trap (AT) based on non-detection rates and relative abundance estimates for 13 taxa of common wetland invertebrates and for taxon richness using data from experiments in constructed wetlands. Taxon-specific non-detection rates for ATs generally exceeded those of SATs, and largest improvements using SATs were for Chironomidae and Gastropoda. SATs were efficient at capturing cladocera, Chironomidae, Gastropoda, total Crustacea, and multiple taxa (taxon richness) but were only slightly better than ATs at capturing Dytiscidae. Temporal differences in capture rates were observed only for cladocera, Chironomidae, Dytiscidae, and total Crustacea, with capture efficiencies of SATs usually decreasing from mid-June through mid-July for these taxa. We believe that SATs may be useful for characterizing wetland invertebrate communities and for developing improved measures of prey available to foraging waterfowl and other aquatic birds.

Key Words: Activity traps, aquatic invertebrates, experimental wetlands, sampling


This resource is based on the following source (Northern Prairie Publication 1085):

Hanson, Mark A., Christiane C. Roy, Ned H. Euliss, Jr., Kyle D. Zimmer, Michael R. Riggs, and Malcolm G. Butler.  2000.  A surface-associated activity trap for capturing water-surface and aquatic invertebrates in wetlands.  Wetlands 20(1):205-212.

This resource should be cited as:

Hanson, Mark A., Christiane C. Roy, Ned H. Euliss, Jr., Kyle D. Zimmer, Michael R. Riggs, and Malcolm G. Butler.  2000.  A surface-associated activity trap for capturing water-surface and aquatic invertebrates in wetlands.  Wetlands 20(1):205-212.  Jamestown, ND: Northern Prairie Wildlife Research Center Online.  http://www.npwrc.usgs.gov/resource/inverts/aqinver/index.htm (Version 21JUL2000).


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Mark A. Hanson, Minnesota Department of Natural Resources, Wetland Wildlife Populations and Research Group, 102 23rd St. NE, Bemidji, Minnesota, USA 56601
Christiane C. Roy*, Kyle D. Zimmer, and Malcolm G. Butler, Department of Zoology, North Dakota State University, Fargo, North Dakota, USA 58105
*Present address: Kansas Department of Wildlife and Parks, P.O. Box 1525, Emporia, Kansas, USA 66801
Ned H. Euliss, Jr., U.S. Geological Survey, Biological Resources Division, Northern Prairie Wildlife Research Center, 8711 37th St. SE, Jamestown, North Dakota, USA 58401-7317
Michael R. Riggs, Minnesota Department of Natural Resources, Carlos Avery Wildlife Management Area, 18310 Zodiac, Forest Lake, Minnesota, USA 55025; Present address: Statistics Research Division, Research Triangle Institute, P.O. Box 12194, Research Triangle Park, North Carolina, USA 27709-2194

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