. Die kanadische Feld - naturforscher. Natural History. 1995 Proulx, Badry, Cole, Drescher, Kolenosky und Pawlina; Pocket Gopher 211.',/./V. 'V^T/-;, ^ / v â ¢^Â"^ Til r--: Jt=1 u U K^t, Maschendraht Karton â ¦ Vegetation-* â ¦ Mutterboden -> Seite 0 40 I - Abbildung 1. Diagramm der Beobachtung Kammer. Die u-bahn Verhalten von Gopher war mit zwei Fernbedienung Panasonic WV 1854 Video-Kameras, die auf jeder Seite der Kammer aufgenommen. Die Kameras wurden mit einem Comiscar 15-180 mm f/1.9 1500 Objektiv und einem hohen Wirkungsgrad 500 W Infrarot Strahler (Avicom Industrielle Kommunikation ausgestattet,

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. The Canadian field-naturalist. Natural history. 1995 Proulx, Badry, Cole, Drescher, Kolenosky, and Pawlina; Pocket Gophers 211 .', / ./v. 'v^T/-;, ^/v ⢠^» ^ Til r--: Jt =1 u U.K^. t, Wire mesh cardboard â¦Vegetation-* ⦠Topsoil -> side view 0 40 I â Figure 1. Diagram of the observation chamber. The underground behavior of gophers was recorded with two remote control Panasonic WV1854 video- cameras set on each side of the chamber. The cameras were equipped with a Comiscar 15-180 mm f/1.9 1500 lens and a high efficiency 500 W infrared light illuminator (Avicom Industrial Communications, Edmonton, Alberta). A miniature infrared Sanyo 9212 videocamera (Norsat, Edmonton, Alberta) was hung over the chamber to record the activities of gophers above ground. However, this was not a remote control camera and gophers' movements could not be contin- uously followed. All cameras were connected to AG- 6010 Panasonic videorecorders. Five juveniles (numbers 1 to 4: males; number 6: sex unknown) and one adult (number 5: sex unknown) were live-trapped in a nearby alfalfa field and kept in captivity at least one day before being released on the top of the observation chamber. Five of them were released between 09:00 and 10:20; one gopher was introduced in mid-afternoon. The fol- lowing behaviors were recorded: exploration above ground, excavation underground (including tunnel blocking), feeding, food gathering, food transport, grooming, and sleeping (including naps). With the exception of the exploration and surface excavation of animals at release time, all gophers' activities above ground were associated with feeding or food gathering. These behaviors were therefore pooled together when determining the time spent above ground by gophers. Measuring tapes placed along the base and on one side of the observation chamber were used to esti- mate the dimensions of the tunnel system. We also used an average gopher body length (without the tail) of 15 cm (Burt and Grossenh

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• bookcentury1900
• bookdecade1910
• booksubjectnaturalhistory
• booky