Annual contribution of carbon, nitrogen, and phosphorus by migrant Canada geese to a hardwater lake
Annual contribution of carbon, nitrogen, and phosphorus by migrant Canada geese to a hardwater lake
复制标题
迁徙加拿大雁对硬水湖的碳、氮和磷的年度贡献
DOI：
10.1080/03680770.1974.11896143
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发表时间：
1975
期刊：
影响因子：
--
通讯作者：
W. C. Johnson
中科院分区：
文献类型：
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作者：
B. Manny;R. Wetzel;W. C. Johnson
每年3月、10月、11月和12月，超过6,000只迁徙的加拿大鹅（Branta canadensis interior托德）在冬青湖（Wintergreen Lake）休息3到10天。K.密歇根州西南部的密歇根州立大学的凯洛格鸟类保护区。在过去的六年里，每周都对使用冬青湖的居民和迁徙水鸟进行精确的统计。在过去的四年里，冬青湖一直是广泛的湖沼学调查的网站有关营养动态和初级生产力。这些湖沼学调查表明，营养移民加拿大鹅的主要原因是过度营养的初级生产力条件的冬青湖。直到1970年1月，加拿大野鹅使用冬青湖的不可预测的习惯阻止了以鹅粪形式对湖泊贡献的营养物质的准确估计。1970年1月9日至11日，大约600只晚秋迁徙的加拿大鹅在一个清晰的区域休息了三天，这个区域覆盖着冰冻的冬青湖。在他们停留在湖上的时间里，准确的记录了鹅的数量，它们在湖面上的位置，在冰上呆的时间和在湖上觅食的时间。1970年1月11日，鹅群离开后，采用随机抽样程序测量了鹅群在湖面上使用的区域内沉积的粪便密度。«少
Each year more than 6,000 migrant Canada geese (Branta canadensis interior Todd) rest for 3 to 10 days during the months of March, October, November, and December on Wintergreen Lake, a productive 15 ha (33 acre) hardwater lake in the W. K. Kellogg Bird Sanctuary of Michigan State University in southwestern Michigan. For the past six years accurate weekly counts have been made of resident and migrant waterfowl using Wintergreen Lake. During the past four years Wintergreen Lake has been the site of extensive limnological investigations relating nutrient dynamics and primary productivity. These limnological investigations suggested nutrients contributed by migrant Canada geese were the chief cause of hypereutrophic primary productivity conditions in Wintergreen Lake. Until January 1970, the unpredictable habits of wild Canada geese using Wintergreen Lake prevented accurate estimation of nutrients contributed ton the lake in the form of goose feces. An opportunity to measure this source of nutrients was presented on 9 to 11 January 1970 when about 600 late fall migrant Canada geese rested part of three days in a clearly defined area on newly fallen snow covering frozen Wintergreen Lake. During their stay on the lake accurate records were kept of goose numbers, their location onmore » the lake surface, hours spent on the ice and hours spent feeding off the lake. After the geese left on 11 January 1970, a random sampling procedure was used to measure the density of droppings deposited within the area used by the geese on the lake surface.« less