Muskrat Lodge Locations near transect 1 on northern Hog Island of the Virginia Coast Reserve 2005-2015

Locations of lodges of muskrats near Transect 1 on the northern end of Hog Island in May 2005 and repeated in May 2007, April 2009, May 2011, April 2013 and March 2015. In April 2009 no active muskrat lodges were observed from Transect 1. The remains of two lodges were observed, but they were less than 20 cm in height, had vegetation growing out of them, and showed no sign of activity, so they were not surveyed. Similarly in April 2011 a survey yielded no lodges. So for 2009 and 2011 GIS files were not created, because they would not have contained any points. In 2013 and 2015 one and three lodges were observed, respectively. Data collection was ceased after 2015, when the spread of Phragmites decreased visibility along the open areas of the transect to a few meters, making it impossible to detect lodges adjacent to the transect. Comments in the attribute tables in the layers contains information on the diameter and height(in decimeters or meters) of lodges.

本数据集收录了2005年5月，以及2007年5月、2009年4月、2011年5月、2013年4月与2015年3月多次重复调查获取的霍格岛（Hog Island）北端样带1（Transect 1）附近麝鼠（muskrat）巢穴点位分布数据。2009年4月的调查中，样带1未发现任何活跃麝鼠巢穴，仅观测到2处巢穴残迹：其高度不足20厘米，已有植被从中长出，且无任何活动迹象，故未纳入本次调查范围。2011年4月的调查同样未发现任何麝鼠巢穴，因此2009年与2011年未生成地理信息系统（GIS）文件，因该两次调查未采集到任何有效点位数据。2013年与2015年的调查中，分别观测到1处与3处麝鼠巢穴。2015年后，入侵性芦苇（Phragmites）大范围扩散，导致样带开阔区域的可视范围缩减至数米，无法识别紧邻样带的麝鼠巢穴，数据采集工作就此终止。各GIS图层的属性表注释字段包含麝鼠巢穴的直径与高度信息，单位为分米或米。