Seasonal detection rates of river otters (Lontra canadensis) using bridge-site and random-site surveys
Seasonal detection rates of river otters (Lontra canadensis) using bridge-site and random-site surveys
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使用桥梁现场和随机现场调查得出河獭（Lontra canadensis）的季节性检出率
DOI：
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发表时间：
2009
期刊：
影响因子：
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通讯作者：
A. R. Mynsberge
中科院分区：
文献类型：
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作者：
S. Crimmins;N. Roberts;D. Hamilton;A. R. Mynsberge
调查地点的随机化通常是可取的，因为它的无偏倚的方法，但经常被放弃，因为后勤限制。这对河獭（Lontra canadensis, Schreber, 1777）来说是正确的，通常用桥来确定调查地点。2001-2003年，我们在美国密苏里州南部的两条河流上使用随机调查点和固定过桥点对水獭进行了季节性标志调查。在夏季，随机地点比桥梁地点更容易检测到水獭标志（P < 0.0001）， 68%的随机地点（n = 348）和40%的桥梁地点（n = 60）被检测到水獭标志。夏季随机站点的粪便丰度（8.82±0.6，平均±SE）高于桥梁站点（3.96±1.0）（P = 0.0001）。在冬季也发现了类似但不显著的趋势。在两个季节，随机站点的检测概率显著高于桥梁站点。我们的研究结果表明，对奥特河桥址的调查…
Randomization of survey sites is generally desired because of its unbiased approach, but is often abandoned because of logistical constraints. This is true for river otters (Lontra canadensis (Schreber, 1777)), with bridges commonly determining survey locations. We conducted seasonal sign surveys for river otters on two rivers in southern Missouri, USA, using randomized survey points and fixed bridge-crossing points in 2001–2003. Otter sign was more likely to be detected at randomized sites than at bridge sites in summer (P < 0.0001), with sign being detected on 68% of visits to random sites (n = 348) and on 40% of visits to bridge sites (n = 60). Scat abundance was higher (P = 0.0001) at random sites (8.82 ± 0.6, mean ± SE) than at bridge sites (3.96 ± 1.0) during the summer. Similar but nonsignificant trends were found during the winter. Detection probabilities were significantly higher at random sites than at bridge sites in both seasons. Our results indicate that surveys of bridge sites for river otte...