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Papers by Michael J Wiley

Research paper thumbnail of Appendix C. Pearson correlation matrix with two-tailed significance test

Pearson correlation matrix with two-tailed significance test.

Research paper thumbnail of Appendix D. Total standardized effects of basin cropland and riparian forested wetland on nutrients in the national and regional SEMs

Total standardized effects of basin cropland and riparian forested wetland on nutrients in the na... more Total standardized effects of basin cropland and riparian forested wetland on nutrients in the national and regional SEMs.

Research paper thumbnail of Appendix A. Study unit features: summary of dominant study unit features. Mean values and ranges are shown for annual precipitation, air temperatures, and study site basin area

Study unit features: summary of dominant study unit features. Mean values and ranges are shown fo... more Study unit features: summary of dominant study unit features. Mean values and ranges are shown for annual precipitation, air temperatures, and study site basin area.

Research paper thumbnail of Appendix B. Site variable means (mean and standard deviation of environmental, physical habitat, water chemistry, and invertebrate variables for sampled sites)

Site variable means (mean and standard deviation of environmental, physical habitat, water chemis... more Site variable means (mean and standard deviation of environmental, physical habitat, water chemistry, and invertebrate variables for sampled sites).

Research paper thumbnail of Interacting Influences of Density and Preference on the Emigration Rates of Some Lotic Chironomid Larvae (Diptera:Chironomidae)

Ecology, 1981

Abstract. The effects of manipulations of density and sediment type on the emigration rates of ch... more Abstract. The effects of manipulations of density and sediment type on the emigration rates of chironomid larvae (Diptera:Chironomidae) from Hunt Creek, Montmorency County, Michigan, USA, were examined in artificial stream chambers. Both basic sediment ...

Research paper thumbnail of Territory Abandonment, Theft, and Recycling by a Lotic Grazer: A Foraging Strategy for Hard Times

Research paper thumbnail of A spatially constrained clustering program for river valley segment delineation from GIS digital river networks

Research paper thumbnail of Microbial Community Functional Potential and Composition Are Shaped by Hydrologic Connectivity in Riverine Floodplain Soils

Microbial Ecology

Riverine floodplains are ecologically and economically valuable ecosystems that are heavily threa... more Riverine floodplains are ecologically and economically valuable ecosystems that are heavily threatened by anthropogenic stressors. Microbial communities in floodplain soils mediate critical biogeochemical processes, yet we understand little about the relationship between these communities and variation in hydrologic connectivity related to land management or topography. Here, we present metagenomic evidence that differences among microbial communities in three floodplain soils correspond to a long-term gradient of hydrologic connectivity. Specifically, all strictly anaerobic taxa and metabolic pathways were positively associated with increased hydrologic connectivity and flooding frequency. In contrast, most aerobic taxa and all strictly aerobic pathways were negatively related to hydrologic connectivity and flooding frequency. Furthermore, the genetic potential to metabolize organic compounds tended to decrease as hydrologic connectivity increased, which may reflect either the observed concomitant decline of soil organic matter or the parallel increase in both anaerobic taxa and pathways. A decline in soil N, accompanied by an increased genetic potential for oligotrophic N acquisition subsystems, suggests that soil nutrients also shape microbial communities in these soils. We conclude that differences among floodplain soil microbial communities can be conceptualized along a gradient of hydrologic connectivity. Additionally, we show that these differences are likely due to connectivity-related variation in flooding frequency, soil organic matter, and soil N. Our findings are particularly relevant to the restoration and management of microbially mediated biogeochemical processes in riverine floodplain wetlands.

Research paper thumbnail of Biological and Chemical Characteristics of the River Ganga (Ganges)

Journal of the International Institute, Feb 1, 2005

Research paper thumbnail of Countergradient variation in growth of spotted gar from different latitudes, with implications for conservation

ABSTRACT The spotted gar (Lepisosteus oculatus) is one of seven extant members of the family Lepi... more ABSTRACT The spotted gar (Lepisosteus oculatus) is one of seven extant members of the family Lepisosteidae and ranges from the southern Great Lakes region to the Gulf Coast. The spotted gar has a disjoint distribution and is more common in the Mississippi River basin than the Great Lakes Region. The Great Lakes basin population (peripheral) is poorly studied and may exhibit different life history traits from the Mississippi River basin population (core). We hypothesized that the peripheral population of spotted gars exhibited a faster growth rate and capacity for growth than those from the core population due to countergradient variation, which compensates for shorter length of growing season at higher latitudes. We reared young of the year spotted gars from both populations (N=60) in a common garden environment for 160 days to test for countergradient variation in growth. Individual fish were fed ad libitum and weighed and measured weekly to estimate growth. Results indicated gars from the peripheral population grew significantly larger and faster than those from core the population, suggesting countergradient variation in growth. DNA and morphometric analyses suggested increased divergence between peripheral and core populations, providing a strong basis for further conservation efforts.

Research paper thumbnail of Distribution and Prevalence of Keystone Parasite in the Eastern United States

Research paper thumbnail of Influence of tributary position on the structure of warmwater fish communities

Canadian Journal of Fisheries and Aquatic Sciences, 1992

Research paper thumbnail of Fish Assemblages, Connectivity, and Habitat Rehabilitation in a Diked Great Lakes Coastal Wetland Complex

Transactions of the American Fisheries Society, Apr 1, 2014

Research paper thumbnail of Growth and Production of Juvenile Trout in Michigan Streams: Influence of Temperature

Research paper thumbnail of Ecological Targets for Rehabilitation of the Rouge River

Research paper thumbnail of Relationships Between Habitat and Fish Density in Michigan Streams

Research paper thumbnail of A Landscape-Based Ecological Classification for River Valley Segments in Lower Michigan

Research paper thumbnail of Use of an In Use of an In--stream Heat Exchange Model to Evaluate stream Heat Exchange Model to Evaluate Potential Habitats for Coldwater Fish Species Potential Habitats for Coldwater Fish Species in the Muskegon River Watershed, MI in the Muskegon River Watershed, MI

Research paper thumbnail of A landscape-scale habitat suitability model to evaluate the effects of flow reduction on fish assemblages in Michigan streams

Research paper thumbnail of Using a high-resolution acoustic camera (DIDSON) to estimate fish abundance and movement in a Lake Erie coastal wetland

Research projects in the Crane Creek coastal wetland complex (Ottawa National Wildlife Refuge) ar... more Research projects in the Crane Creek coastal wetland complex (Ottawa National Wildlife Refuge) are exploring wetland habitat rehabilitation strategies and their impact on Lake Erie fishes. Established methods of assessing fish assemblages (e.g., fyke nets) can be used to characterize fish (community composition and abundance) in a specific location, but provide little information on fish behavior and short-term rates of movement. From a habitat rehabilitation perspective, data on fish movement and behavior are critical to both evaluate the biological response to completed projects and guide the design of future projects (e.g., maintaining an appropriate level of hydrologic connectivity). DIDSON (Dual-frequency IDentification SONar) is a developing technology able to collect high-resolution fisheries data day or night in very shallow turbid water. A DIDSON was deployed for 11 days in Crane Creek at its connection to Lake Erie to explore how Great Lakes fishes used coastal wetland hab...

Research paper thumbnail of Appendix C. Pearson correlation matrix with two-tailed significance test

Pearson correlation matrix with two-tailed significance test.

Research paper thumbnail of Appendix D. Total standardized effects of basin cropland and riparian forested wetland on nutrients in the national and regional SEMs

Total standardized effects of basin cropland and riparian forested wetland on nutrients in the na... more Total standardized effects of basin cropland and riparian forested wetland on nutrients in the national and regional SEMs.

Research paper thumbnail of Appendix A. Study unit features: summary of dominant study unit features. Mean values and ranges are shown for annual precipitation, air temperatures, and study site basin area

Study unit features: summary of dominant study unit features. Mean values and ranges are shown fo... more Study unit features: summary of dominant study unit features. Mean values and ranges are shown for annual precipitation, air temperatures, and study site basin area.

Research paper thumbnail of Appendix B. Site variable means (mean and standard deviation of environmental, physical habitat, water chemistry, and invertebrate variables for sampled sites)

Site variable means (mean and standard deviation of environmental, physical habitat, water chemis... more Site variable means (mean and standard deviation of environmental, physical habitat, water chemistry, and invertebrate variables for sampled sites).

Research paper thumbnail of Interacting Influences of Density and Preference on the Emigration Rates of Some Lotic Chironomid Larvae (Diptera:Chironomidae)

Ecology, 1981

Abstract. The effects of manipulations of density and sediment type on the emigration rates of ch... more Abstract. The effects of manipulations of density and sediment type on the emigration rates of chironomid larvae (Diptera:Chironomidae) from Hunt Creek, Montmorency County, Michigan, USA, were examined in artificial stream chambers. Both basic sediment ...

Research paper thumbnail of Territory Abandonment, Theft, and Recycling by a Lotic Grazer: A Foraging Strategy for Hard Times

Research paper thumbnail of A spatially constrained clustering program for river valley segment delineation from GIS digital river networks

Research paper thumbnail of Microbial Community Functional Potential and Composition Are Shaped by Hydrologic Connectivity in Riverine Floodplain Soils

Microbial Ecology

Riverine floodplains are ecologically and economically valuable ecosystems that are heavily threa... more Riverine floodplains are ecologically and economically valuable ecosystems that are heavily threatened by anthropogenic stressors. Microbial communities in floodplain soils mediate critical biogeochemical processes, yet we understand little about the relationship between these communities and variation in hydrologic connectivity related to land management or topography. Here, we present metagenomic evidence that differences among microbial communities in three floodplain soils correspond to a long-term gradient of hydrologic connectivity. Specifically, all strictly anaerobic taxa and metabolic pathways were positively associated with increased hydrologic connectivity and flooding frequency. In contrast, most aerobic taxa and all strictly aerobic pathways were negatively related to hydrologic connectivity and flooding frequency. Furthermore, the genetic potential to metabolize organic compounds tended to decrease as hydrologic connectivity increased, which may reflect either the observed concomitant decline of soil organic matter or the parallel increase in both anaerobic taxa and pathways. A decline in soil N, accompanied by an increased genetic potential for oligotrophic N acquisition subsystems, suggests that soil nutrients also shape microbial communities in these soils. We conclude that differences among floodplain soil microbial communities can be conceptualized along a gradient of hydrologic connectivity. Additionally, we show that these differences are likely due to connectivity-related variation in flooding frequency, soil organic matter, and soil N. Our findings are particularly relevant to the restoration and management of microbially mediated biogeochemical processes in riverine floodplain wetlands.

Research paper thumbnail of Biological and Chemical Characteristics of the River Ganga (Ganges)

Journal of the International Institute, Feb 1, 2005

Research paper thumbnail of Countergradient variation in growth of spotted gar from different latitudes, with implications for conservation

ABSTRACT The spotted gar (Lepisosteus oculatus) is one of seven extant members of the family Lepi... more ABSTRACT The spotted gar (Lepisosteus oculatus) is one of seven extant members of the family Lepisosteidae and ranges from the southern Great Lakes region to the Gulf Coast. The spotted gar has a disjoint distribution and is more common in the Mississippi River basin than the Great Lakes Region. The Great Lakes basin population (peripheral) is poorly studied and may exhibit different life history traits from the Mississippi River basin population (core). We hypothesized that the peripheral population of spotted gars exhibited a faster growth rate and capacity for growth than those from the core population due to countergradient variation, which compensates for shorter length of growing season at higher latitudes. We reared young of the year spotted gars from both populations (N=60) in a common garden environment for 160 days to test for countergradient variation in growth. Individual fish were fed ad libitum and weighed and measured weekly to estimate growth. Results indicated gars from the peripheral population grew significantly larger and faster than those from core the population, suggesting countergradient variation in growth. DNA and morphometric analyses suggested increased divergence between peripheral and core populations, providing a strong basis for further conservation efforts.

Research paper thumbnail of Distribution and Prevalence of Keystone Parasite in the Eastern United States

Research paper thumbnail of Influence of tributary position on the structure of warmwater fish communities

Canadian Journal of Fisheries and Aquatic Sciences, 1992

Research paper thumbnail of Fish Assemblages, Connectivity, and Habitat Rehabilitation in a Diked Great Lakes Coastal Wetland Complex

Transactions of the American Fisheries Society, Apr 1, 2014

Research paper thumbnail of Growth and Production of Juvenile Trout in Michigan Streams: Influence of Temperature

Research paper thumbnail of Ecological Targets for Rehabilitation of the Rouge River

Research paper thumbnail of Relationships Between Habitat and Fish Density in Michigan Streams

Research paper thumbnail of A Landscape-Based Ecological Classification for River Valley Segments in Lower Michigan

Research paper thumbnail of Use of an In Use of an In--stream Heat Exchange Model to Evaluate stream Heat Exchange Model to Evaluate Potential Habitats for Coldwater Fish Species Potential Habitats for Coldwater Fish Species in the Muskegon River Watershed, MI in the Muskegon River Watershed, MI

Research paper thumbnail of A landscape-scale habitat suitability model to evaluate the effects of flow reduction on fish assemblages in Michigan streams

Research paper thumbnail of Using a high-resolution acoustic camera (DIDSON) to estimate fish abundance and movement in a Lake Erie coastal wetland

Research projects in the Crane Creek coastal wetland complex (Ottawa National Wildlife Refuge) ar... more Research projects in the Crane Creek coastal wetland complex (Ottawa National Wildlife Refuge) are exploring wetland habitat rehabilitation strategies and their impact on Lake Erie fishes. Established methods of assessing fish assemblages (e.g., fyke nets) can be used to characterize fish (community composition and abundance) in a specific location, but provide little information on fish behavior and short-term rates of movement. From a habitat rehabilitation perspective, data on fish movement and behavior are critical to both evaluate the biological response to completed projects and guide the design of future projects (e.g., maintaining an appropriate level of hydrologic connectivity). DIDSON (Dual-frequency IDentification SONar) is a developing technology able to collect high-resolution fisheries data day or night in very shallow turbid water. A DIDSON was deployed for 11 days in Crane Creek at its connection to Lake Erie to explore how Great Lakes fishes used coastal wetland hab...