. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. ORIENTATION OF AMBYSTOMA 233. FIGURE 4. Capture points of a single individual, 1965-67. Dots around pond represent captures on entry and exit, 1965-67. Dots at forest border, entry and exit points 1966-67. Shaded area is probable corridor of travel. EXPERIMENTS INVOLVING DISPLACEMENT OF MIGRATING SALAMANDERS Displacements in the field Since migrating animals tend to use the same track into and out of a breeding pond, they may possess an ability to utilize a directional tendency (Grif- fin, 1952, "Type II orientation,&qu
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. ORIENTATION OF AMBYSTOMA 233. FIGURE 4. Capture points of a single individual, 1965-67. Dots around pond represent captures on entry and exit, 1965-67. Dots at forest border, entry and exit points 1966-67. Shaded area is probable corridor of travel. EXPERIMENTS INVOLVING DISPLACEMENT OF MIGRATING SALAMANDERS Displacements in the field Since migrating animals tend to use the same track into and out of a breeding pond, they may possess an ability to utilize a directional tendency (Grif- fin, 1952, "Type II orientation," or Schmidt-Koenig, 1965, "compass orientation") ; if familiar landmarks or local sensory cues are unavailable or not utilized, they may move in a prescribed direction or its reciprocal (along a directional axis). Assuming that only a compass sense is involved, the animals should fail to reach the pond in the following situation: animals are captured at the pond border, carried 90° around the pond, and then taken in a straight line away from the pond and released at a location where familiar landmarks are obscured. For example, if an animal that had migrated from a terrestrial retreat east of the pond to the east border of the pond, was moved to a point north of the pond, it would travel east or west and miss the pond. The following experiments tested this possibility. Twelve animals captured at night in the ENE trap at Pond A border were placed in opaque containers and transported at dawn to four locations. Three animals were released 20 m. from ENE; three at 135 m. from ENE; three at 45 m. from NNW; and three at 175 m. from NNW. Of six animals collected in trap NNW, three were released 20 m. from ENE and three 45 m. from NNW. Results of this experiment are presented in Table I. One animal released 135 m. from ENE was killed by raccoons on return to the pond Please note that these images are extracted from scanned page images that may have been digitally
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Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
