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Lake Michigan Hydrodynamics: Mysis And Larval Fish Interactions, Yutta Wang
Lake Michigan Hydrodynamics: Mysis And Larval Fish Interactions, Yutta Wang
Theses and Dissertations
I studied the interactions between Lake Michigan hydrodynamics (the spring thermal bar) and Mysis, deepwater sculpin, and burbot larvae. The thermal bar is a zone of sinking 4º С water that separates warmer inshore water from colder offshore water. Mysis was a major bycatch of sampling for larval fishes. The density of Mysis did not differ statistically between inshore (about 6º С) and offshore of the thermal bar, but the percentage of Mysis that were newborns was significantly higher inshore (P = 0.007). These "early start" coastal Mysis may have an advantage in growth and survival, but with the risk …
The Effects Of Habitat Use On The Round Goby, Neogobius Melanostomus, In The Lower Fox River And Lake Michigan., Matthew E. Larsen
The Effects Of Habitat Use On The Round Goby, Neogobius Melanostomus, In The Lower Fox River And Lake Michigan., Matthew E. Larsen
Lawrence University Honors Projects
The invasive round goby was introduced to Lake Michigan in 1998 (DeStasio, 2012). Since the species was introduced they have increased their range to include tributaries of the Lake Michigan watershed; such as the Lower Fox River. The presence of the round goby in the Lower Fox River was first documented in the Lower Fox River in 2006 (Kornis, 2008). We compared the size and age differences between round goby populations at these habitats to see if there was a variance between the two habitats. Round goby from Lake Michigan were statistically longer and heavier than those from the Lower …
Nearshore Benthic Oxygen Dynamics In Lake Michigan, Emily H. Tyner
Nearshore Benthic Oxygen Dynamics In Lake Michigan, Emily H. Tyner
Theses and Dissertations
The intense colonization of the Laurentian Great Lakes by dreissenid mussels has profoundly changed ecosystem processes, particularly benthic oxygen dynamics. Dissolved oxygen concentrations in mussel beds, sloughed Cladophora mats, and sediment indicate that hypoxia forms and disappears in some substrata (ephemeral Cladophora mats), while occurring consistently in others (depositional areas of sloughed Cladophora). Dissolved organic carbon concentrations are high (mean: 143 ± ± 28 ppm) in depositional Cladophora mats but lower (˂ 10 ppm) in most other environments. Field sampling and laboratory experiments suggest that under conditions of low water velocity and thick Cladophora cover, hypoxia may develop atop …
Changes In The Lake Michigan Trophic Structure: As Revealed By Stable C And N Isotopes, Benjamin Turschak
Changes In The Lake Michigan Trophic Structure: As Revealed By Stable C And N Isotopes, Benjamin Turschak
Theses and Dissertations
Food web structures which incorporate both slow (nearshore or detrital) and fast (pelagic) energy channels convey stability upon food web biota through asynchrony and multichannel trophic omnivory. Within the Lake Michigan food web, invasive dreissenid mussels have caused rapid changes to food web structure and energy flows. I used stable C and N isotopes and gut content analysis to determine how Lake Michigan food web structure and stability has changed in the past decade, coincident with the expansion of dreissenid mussels and a decrease in pelagic phytoplankton production. Fish and invertebrate samples collected near the port of Milwaukee, WI were …