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首页> 外文期刊>Conservation Biology >Effects of agricultural cultivation on demographicsof Southern High Plains amphibians
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Effects of agricultural cultivation on demographicsof Southern High Plains amphibians

机译：农业种植对南部高平原两栖动物种群统计的影响

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Anthropogenic disturbance of landscapes surrounding wetlands is considered a factor in local and global amphibian declines. Few data exist on the effects of agricultural cultivation of wetland watersheds on amphibians, and results from previous studies are contradictory. Our objective was to test the effects of general anthropogenic land use (cultivation vs. grassland) on the demographics of seven species and three age classes of amphibians in the Southern High Plains of Texas. We partially enclosed 16 playa wetlands (4 per land use per year) with drift fences and pitfall traps and monitored relative daily abundance and diversity from 16 May to 17 October 1999 and 19 April to 18 August 2000. In general, relative abundance (i.e., average daily capture) of New Mexico and plains spadefoots ( Spea multiplicata, S. bombifrons) was greater at cropland than grassland playas; the abundance of other species and diversity of the amphibian assemblage was not affected by land use. Also, abundance generally was greater in 1999 than 2000 for metamorph spadefoots and barred tiger salamanders (Ambystoma tigrinum mavortium). Differences in spadefoot abundance between land-use types may have been related to low species-specific vagility, resulting in increased nestedness within disturbed landscapes and reduced abundance of a potential keystone intraguild predator in cropland playas. The yearly difference in amphibian abundance was likely related to annual precipitation, which influenced wetland hydroperiod. Agricultural cultivation surrounding wetlands is associated with the increased abundance of some amphibian species, but other demographic and fitness parameters-such as temporal demographics, body size, and diet diversity-may be negatively affected.
机译：湿地周围景观的人为干扰被认为是当地和全球两栖动物数量下降的一个因素。关于湿地流域的农业种植对两栖动物的影响的数据很少，而先前的研究结果却是矛盾的。我们的目标是测试德克萨斯州南部高平原地区一般人为土地利用（耕种与草地）对七种和三种年龄类别的两栖动物的人口统计影响。我们在1999年5月16日至10月17日以及2000年4月19日至2000年8月18日之间，用漂移栅栏和陷阱陷阱部分封闭了16个滩地（每年每土地使用4个），并监测了相对每日的丰度和多样性。新墨西哥州和平原黑脚（Spea multiplicata，S。bombifrons）在农田中的平均捕获量要大于草地草场;两栖动物种类的丰富和多样性不受土地利用的影响。此外，1999年变形金刚锹足和虎tiger（Ambystoma tigrinum mavortium）的丰度通常比2000年高。土地利用类型之间的赤足丰度差异可能与特定物种的低挥发性有关，从而导致受干扰的景观内巢穴的增加以及农田草场中潜在的梯形公会内捕食者的丰度降低。两栖动物丰度的年度差异可能与年降水量有关，这影响了湿地的水周期。湿地周围的农业耕作与某些两栖动物物种的丰度增加有关，但其他人口统计和适应性参数（例如时间人口统计，体重和饮食多样性）可能受到负面影响。

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