Geog-335
Lab 4
The Invasive Species Threat to Pine Lake
Introduction:
Pine Lake is a pristine drainage lake located in northern Chippewa County that has been subject to many research projects dating back to the early 20th century. The water quality of the lake is not surpassed by many lakes in the entire state of Wisconsin. Public access to the lake is present but limited, and the lake is moderately developed with a forested surrounding it. Currently, Pine Lake does not possess any threatening invasive species which is uncommon compared to many of the lakes in Wisconsin. It is extremely important that Pine Lake be preserved for future generations to admire and enjoy.
This project involved the follow up of the Pine Lake project that took place during the summer of 2015. The overall objectives of the Pine Lake project were to research the various species of aquatic mosses inhabiting the lake, obtain information regarding invasive species in the surrounding area, and to conduct a bluegill nest survey of the entire lake to be used in future research. The Pine Lake project is important in ensuring the preservation of Pine Lake.
So what lakes in the surrounding area containing harmful invasive species pose a threat to contaminating Pine Lake? To answer this question lakes had to meet certain criteria. This criteria included proximity to Pine Lake, proximity to a DNR access boat landing, relative human activity on the lake, and presence of certain invasive species. The identification of these "hazard lakes" is extremely important for the preservation of Pine Lake. Identifying which lakes are hazardous to Pine Lake could be very useful for the Wisconsin DNR's efforts to preserve our natural resources.
Data Sources:
Data used in this project were obtained through the Wisconsin DNR's geodatabase. This includes county, major road, and lake data. Additional DNR boat landing data was accessed on the DNR's website. Invasive species data was compiled during the summer of 2015 Pine Lake project (unpublished data) and contains information about many surrounding lakes. Some of the information obtained during the Pine Lake project about surrounding lakes includes the number of docks on each lake, as well as what invasive species the lake possesses.
Methods:
In order to classify hazard lakes, those lakes had to meet certain criteria. Hazard lakes were identified in the following manner. First, lakes within the target counties (counties around Pine Lake) were clipped. This clip was then joined to the invasive species data collected during the Pine Lake project to attach invasive species data to lakes within the target counties.
Lakes were then selected that contained invasive species and had high amounts of human activity. Several common invasive species were chosen for their abundance in the region as well as their prolific behavior. The invasive species chosen include Rusty crayfish, Eurasian milfoil/milfoil hybrid, and Curly leaf pondweed. Lakes that had high amounts of human activity were determined based off of how many docks they possessed. Lakes possessing 100 or more docks were classified as being high in human activity. The lakes clip/invasive join was then subjected to a query to select for lakes that met the previously described criteria. Lakes that met the criteria were then considered hazardous. However, not all of the lakes selected were within a close enough proximity to Pine Lake.
Lakes that were selected as being hazardous were then subjected to several selections by location. The lakes that were to be identified as hazardous to Pine Lake had to be within ten miles of a DNR access boat landing. They also had to be within 20 miles of Pine Lake. Lakes that met the proximity criteria were then labeled "hazard lakes". A data flow model was also created to display the process of how the hazard lakes were selected (Figure 1). Finally, a graduated colors map was generated based off of how many of the previously listed invasive species the hazard lakes possessed. This map was used to determine which lakes posed the biggest threats to Pine Lake.
Figure 1. Shown above is the data flow model generated from the identification process of lakes hazardous to Pine Lake.
Results:
The graduated colors map generated (Figure 2) yielded which lakes where most hazardous to Pine Lake. The chain of lakes located in Chetek, WI which included Prairie, Pokegama, and Chetek Lakes where all identified as hazard lakes. Certain lakes that lie very close to Pine Lake were also selected. These lakes included Potato, McCann, Chain, and Long Lakes. These lakes are located only several miles from Pine Lake and should be a cause for concern. The Chippewa River system located to the east of Pine Lake was also selected as hazardous. The Chippewa River system possessed all of the invasive species previously listed and creates a hazard for all lakes in the surrounding area.
Figure 2. Shows the graduated colors map generated which identifies lakes that are hazardous to Pine Lake. Lakes containing all invasive species appear as dark red while lakes containing zero of the listed invasive species appear as light tan.
Evaluation:
Overall the project represented more of a pilot study to potentially be used in the future. A Crayfish research project that is set to take place this summer will potentially use some of the data generated during this project. If asked to repeat the project, several things would have been done differently. First, the amount of invasive species included would be greater. Only four invasive species were used which do not represent the entirety of the invasive species problem. Time was a limiting factor; more time would have allowed for the inclusion of more invasive species. Second, the area of the project would have been increased to a state-wide area, instead of just looking at hazardous lakes within 20 miles of Pine Lake. This wider gaze would be more insightful in identifying areas that contain many invasive species. This project also posed several challenges. The main challenge was organizing the data from the Pine Lake project to be used in ArcMap. The data was not collected for use in ArcMap, though it should have been. Organizing the Pine Lake project data took some time. Another challenge was determining which tools to use. The nature of the project did not involve the use of many tools; however, it did involve other aspects such as several lengthy query statements. Overall, the project proved to be very insightful and practical.
Sources:
Wisconsin Department of Natural Resources. (2016). Retrieved from ftp://ftp.wi.gov/DNR/public/Lands/
Wisconsin Department of Natural Resources. (2016). Wisconsin DNR: Base Data [Data file and documentation].
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