Zebra mussels and Eurasian watermilfoil reporting patterns in Minnesota

Research output: Contribution to journalArticle

Abstract

Recognizing common reporting patterns of aquatic invasive Zebra mussels (Dreissena polymorpha, ZM) and Eurasian watermilfoil (Myriophyllum spicatum, EWM) helps to better understand invasions. We hypothesize that confirmed invasions may be confounded by human population density, leading to overrepresentation of invasions in highly populated areas and underrepresentation in less populated areas. Here we recognize dispersal patterns of confirmed ZM and EWM invasions in Minnesota, USA, using spatial clustering and directionality tests, while adjusting for human density. By 2015, 125 (0.68%) and 304 (1.65%) of 18,411 Minnesota waterbodies were reported to have ZM and EWM, respectively. A multivariate multinomial model of the scan test was used to identify clustering of invasions. The resulting 23 clusters included 13 with either or both ZM and EWM, and most clusters (11/13) occurred in areas with >10 people per square kilometer. Whereas, among the 10 clusters without invasion, nine were from less populated areas. The standard deviation ellipse and the spatiotemporal directionality tests indicated a northwestern trend of invasions, which is in the same direction as the I-94 interstate highway connecting urban centers. Results suggested that confirmed ZM and EWM invasions are potentially confounded by human densities, which is explained by varying human impact on either or both dispersal and reporting of invasions. Considering this impact of human density, we suggest that a combination of passive and targeted surveillance, where the magnitude of efforts are stratified by the human densities, may provide insight into the true invasion status and its progression in the Great Lakes region.

Original languageEnglish (US)
Pages (from-to)458-466
Number of pages9
JournalJournal of Great Lakes Research
Volume44
Issue number3
DOIs
StatePublished - Jun 1 2018

Fingerprint

Dreissena polymorpha
anthropogenic activities
Myriophyllum spicatum
Great Lakes region
testing
ellipse
anthropogenic effect
human population
population density
road
monitoring
lake
test

Keywords

  • Aquatic invasions
  • Directionality, reporting bias, underreporting
  • Scan statistics
  • Spatial clusters

Cite this

Zebra mussels and Eurasian watermilfoil reporting patterns in Minnesota. / Kanankege, Kaushi S.T.; Alkhamis, Moh A.; Perez, Andres M; Phelps, Nicholas.

In: Journal of Great Lakes Research, Vol. 44, No. 3, 01.06.2018, p. 458-466.

Research output: Contribution to journalArticle

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