University of Colorado Boulder
As the climate warms, global biodiversity is plummeting and extinction rates are rising (Jenkins, 2003). Freshwater ecosystems specifically are experiencing huge losses in diversity (Jenkins, 2003; Ormerod et al., 2010; Collier et al., 2016). Conservation of invertebrates is particularly urgent because they are foundational to the trophic systems in streams and lakes, comprising 95% of all species on earth (Titley et al., 2017), and over 60% of biodiversity in freshwater ecosystems (Collier et al., 2016). Through analysis of both my own field measurements and historical data I seek to gain a preliminary understanding of temperature and macroinvertebrate community changes that have taken place in a small stream in Michigan, in order to develop baseline data that will aid in identifying changes in the future. I utilize data before and after the installation of a unique stream cooling modification to explore: (1) How temperature has changed over time in Pine River? (2) How the macroinvertebrate community changed over time, as compared to a 1993 baseline? and (3) What do these changes mean for the community health of this stream? I compare my own 2020 aquatic macroinvertebrate samples to a 1993 macroinvertebrate dataset and look for statistically significant changes in order level percent abundance and taxa density. I analyze temperature data and find a significant cooling trend as a result of an anthropogenic temperature manipulation. Although Pine River has cooled since 1993 the macroinvertebrate community remains quite similar, with the exception of a significant increase in Trichoptera. My research suggests that this location could provide a refuge for species in the region that are negatively affected by warming water temperatures, and highlights the need for a better understanding of the factors that influence macroinvertebrate communities.
Climate | Environmental Indicators and Impact Assessment | Environmental Studies | Fresh Water Studies | Research Methods in Life Sciences | Zoology
Campbell, Nyika, "Macroinvertebrate Community and Temperature Changes in a Michigan Stream" (2020). Independent Study Project (ISP) Collection. 3282.