The effects of Typha x glauca density on biodiversity, habitat complexity, and water quality of Great Lakes wetlands


Great Lakes wetlands are being directly affected by climate change. As temperature, precipitation, and evaporation increase throughout the region, lake levels are likely to experience greater fluctuations. These fluctuations result in an increased susceptibility to invasive species. One invasive cattail, Typha X glauca, has a wide range of tolerance to water level fluctuations allowing it to establish and persist. The objectives of this research were to study if increasing T. X glauca density from channel to interior of marshes affects the abundance and species diversity of larval fish and amphibians, and macroinvertebrates, and if so, whether habitat complexity and chlorophyll a levels differed across increasing T. X glauca densities. Additionally, the directionality of the trap was recorded to test whether there was significant movement in and out of the channel. In order to study the effects of density on biodiversity, habitat complexity, and water quality of northern Michigan wetlands, larval fish and amphibians, and macroinvertebrates were sampled with light traps from June to August 2017. In addition, habitat complexity, chlorophyll a concentrations, and water quality measurements were obtained. The study indicated that average abundance of taxa decreased across increasing densities whereas species and family diversity was highest where density was highest. Differences between study sites and sampling times as well as habitat complexity contributed to these findings.


Objectives were to measure plant growth form diversity, chlorophyll a, and macroinvertebrate, amphibian, and fish diversity and abundance with increasing Typha density.

Douglas Lake Profiles 1913-2016


Physical and chemical properties of water in South Fishtail Bay and the Pells Island Depression in Douglas Lake. Aggregated data is the first file in the list of data sources, with all the original data sheets following.

Core Areas: 
Short name: 
Douglas Lake Profile Master Dataset

Provide an aggregated source of the physical and chemical properties of Douglas Lake in two areas from 1913 to 2016, as well as the original individual datasets collected by the investigators themselves.

Data sources: 
Douglas Lake Aggregate Data 1913-2016
Welch-Eggleton South Fishtail Bay Profiles 1913-1950
Welch-Eggleton Pells Island Profiles 1918-1941
Welch-Eggleton South Fishtail Bay Alkalinity 1921-1950
Miller South Fishtail Bay Profiles 1933-1934
Miller South Fishtail Bay Alkalinity 1933-1934
Tucker South Fishtail Bay Profiles 1948-1951
Tucker South Fishtail Bay Alkalinity 1948-1951
Tucker South Fishtail Bay Nutrient Profiles 1950-1951
Lind South Fishtail Bay Profiles 1970-2011
Lind Pells Island Profiles 1970-2011
RANN South Fishtail Bay Profiles 1972-1975
RANN South Fishtail Bay Alkalinity 1972-1975
RANN South Fishtail Bay Nutrient Profiles 1973-1975
Glover South Fishtail Bay Profiles 1979-1987
Glover South Fishtail Bay Alkalinity 1980-1983
Glover Pells Island Profiles 1982-1987
Recent South Fishtail Bay Profiles 1989-2016