Northwestern Naturalist 

About: Northwestern Naturalist is an academic journal published by Society for Northwestern Vertebrate Biology. The journal publishes majorly in the area(s): Population & Nest. It has an ISSN identifier of 1051-1733. Over the lifetime, 773 publications have been published receiving 5319 citations.

A comparison in Colorado of three methods to monitor breeding amphibians

Abstract: We surveyed amphibians at 4 montane and 2 plains lentic sites in northern Col- orado using 3 techniques: standardized call surveys, automated recording devices (frog-log- gers), and intensive surveys including capture-recapture techniques Amphibians were ob- served at 5 sites Species richness varied from 0 to 4 species at each site Richness scores, the sums of species richness among sites, were similar among methods: 8 for call surveys, 10 for frog-loggers, and 11 for intensive surveys (9 if the non-vocal salamander Ambystoma tigrinum is excluded) The frog-logger at 1 site recorded Spea bombifrons which was not active during the times when call and intensive surveys were conducted Relative abundance scores from call surveys failed to reflect a relatively large population of Bufo woodhousii at 1 site and only weakly differentiated among different-sized populations of Pseudacris maculata at 3 other sites For ex- tensive applications, call surveys have the lowest costs and fewest requirements for highly trained personnel However, for a variety of reasons, call surveys cannot be used with equal effectiveness in all parts of North America

Russian–american long-term census of the arctic: benthic fishes trawled in the chukchi sea and bering strait, august 2004

Abstract: Bottom trawl nets towed at 17 stations from Bering Strait to the northwestern Chukchi Sea during the 1st cruise of the Russian–American Long-term Census of the Arctic (RUSALCA) in August 2004 caught 33 or more species of fishes distributed among 10 families. The families with the most species were Cottidae (8), Zoarcidae (6 or 7), and Agonidae (4). The 4 most abundant fishes were Gymnocanthus tricuspis (Cottidae), Myoxocephalus scorpius groenlandicus (Cottidae), Hippoglossoides robustus (Pleuronectidae), and Boreogadus saida (Gadidae), collectively accounting for 79% of the catch by numbers. Theragra chalcogramma, H. robustus, and M. polyacanthocephalus occurred farther north than previously recorded. We found the 2nd and 3rd records of occurrence of Liparis fabricii for the Chukchi Sea and a new maximum size for that species; and the 2nd record of Pallasina barbata for the Chukchi Sea. New studies of fresh and archived material clarified historical distributions and enabled more accurate identif...

Efficacy of three types of live traps used for surveying small mammals in the pacific northwest

Abstract: Capture rates of 3 trap types were compared at 5 sites in and around Portland, Oregon, USA: Sherman traps, custom-made steel-mesh traps, and pitfall traps. Simpson and Shannon diversity indices were calculated for various combinations of trap types and compared for differences. Sherman and mesh traps also were evaluated for mortality rates before and after the use of a rain shield during the rainy winter months. Of the 5 species of small mammals caught in all 3 types of traps, pitfalls were the most effective trap, followed by Sherman traps, with mesh traps a very distant third. Sherman traps significantly outperformed mesh traps overall when compared for larger species that were not contained by pitfall traps. Different combinations of trap types yielded significantly different Simpson and Shannon diversity indices, with pitfalls having the highest measures for small mammals, and a combination of Sherman and pitfall traps having the highest measures when considering both larger and smaller mamma...