Andrew F. Casper
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View article: Correction to: Smallmouth buffalo (Ictiobus bubalus Rafinesque) population trends and demographics in the Upper Mississippi River System
Correction to: Smallmouth buffalo (Ictiobus bubalus Rafinesque) population trends and demographics in the Upper Mississippi River System Open
View article: Smallmouth buffalo (Ictiobus bubalus Rafinesque) population trends and demographics in the Upper Mississippi River System
Smallmouth buffalo (Ictiobus bubalus Rafinesque) population trends and demographics in the Upper Mississippi River System Open
Smallmouth buffalo ( Ictiobus bubalus Rafinesque) are a large-bodied fish highly valued and commercially exploited across most of their range. Despite this, relatively little is known of their population demographics compared to other expl…
View article: First records of the fishhook waterflea Cercopagis pengoi Ostroumov, 1891 in the Mississippi River Basin, Illinois Waterway, USA
First records of the fishhook waterflea Cercopagis pengoi Ostroumov, 1891 in the Mississippi River Basin, Illinois Waterway, USA Open
This paper reports the first records of Cercopagis pengoi in the Mississippi River Basin, Illinois, USA.In 2017, a total of 11 C. pengoi were collected from two different locations during zooplankton sampling in the Illinois Waterway.One l…
View article: Identifying monitoring information needs that support the management of fish in large rivers
Identifying monitoring information needs that support the management of fish in large rivers Open
Management actions intended to benefit fish in large rivers can directly or indirectly affect multiple ecosystem components. Without consideration of the effects of management on non-target ecosystem components, unintended consequences may…
View article: Conservation potential of North American large rivers: the Wabash River compared with the Ohio and Illinois rivers
Conservation potential of North American large rivers: the Wabash River compared with the Ohio and Illinois rivers Open
Large rivers are ecological treasures with high human value, but most have experienced decades of degradation from industrial and municipal sewage, row-crop agricultural practices, and hydrologic alteration. We reviewed published analyses …
View article: Spatial variation in bluegill population demographics in a highly modified large river system
Spatial variation in bluegill population demographics in a highly modified large river system Open
Population demographics are used by biologists and managers to determine the quality of a fishery and set regulations to achieve desired management goals. Regulating a large river system fishery that spans a substantial geographical region…
View article: Status, trends, and population demographics of selected sportfish species in the La Grange Reach of the Illinois River
Status, trends, and population demographics of selected sportfish species in the La Grange Reach of the Illinois River Open
Sportfish species, specifically Yellow Bass Morone mississippiensis, White Bass Morone chrysops, Largemouth Bass Micropterus salmoides, Bluegill Lepomis macrochirus, Black Crappie Pomoxis nigromaculatus, and White Crappie P. annularis, oft…
View article: Invasive silver carp is empirically linked to declines of native sport fish in the Upper Mississippi River System
Invasive silver carp is empirically linked to declines of native sport fish in the Upper Mississippi River System Open
Empirical assessments of the influence of invasive species on native species are infrequent because the required long-term data are rarely available. The invasion of silver carp in the Upper Mississippi River System (UMRS) provides a uniqu…
View article: Over 50 years of fish community monitoring in Illinois’ large rivers: The evolution of methods used by the Illinois Natural History Survey’s Long-term Survey and Assessment of Large-River Fishes in Illinois
Over 50 years of fish community monitoring in Illinois’ large rivers: The evolution of methods used by the Illinois Natural History Survey’s Long-term Survey and Assessment of Large-River Fishes in Illinois Open
This document describes the methodological evolution of the Long-Term Illinois Rivers Fish Population Monitoring Program since its inception. The principal changes include a shift from fixed-site sampling to stratified random sampling at t…
View article: Zooplankton as an Indicator of the Ecosystem Response to Bigheaded Carp Suppression via Commercial Harvest in the Illinois River (2010 – 2017)
Zooplankton as an Indicator of the Ecosystem Response to Bigheaded Carp Suppression via Commercial Harvest in the Illinois River (2010 – 2017) Open
Current levels of Asian carp harvest lead to measurable increases in zooplankton abundance and biomass meaning zooplankton are an indicator of ecosystem response to carp suppression. However, diversity especially of large bodied cladoceran…
View article: Evaluating the potential responses of native fish and mussels to proposed separation of Lake Michigan from the Illinois River Waterway at Brandon Road Lock and Dam
Evaluating the potential responses of native fish and mussels to proposed separation of Lake Michigan from the Illinois River Waterway at Brandon Road Lock and Dam Open
The Brandon Road Lock and Dam (BRLD) location is currently a focal point for developing a barrier to prevent Bighead carp (Hypophthalmichthys nobilis) and Silver carp (H. molitrix), hereafter referred to as invasive carps,from entering Lak…
View article: Survey of Intersex (Testicular Oocytes) in Black Crappie Collected from the Illinois River Waterway
Survey of Intersex (Testicular Oocytes) in Black Crappie Collected from the Illinois River Waterway Open
Researchers have documented intersex (testicular oocytes) in male fishes in many species worldwide and prevalence of the condition is strongly related to exposure to endocrine-disrupting compounds in aquatic ecosystems. There is no availab…
View article: Can data from disparate long-term fish monitoring programs be used to increase our understanding of regional and continental trends in large river assemblages?
Can data from disparate long-term fish monitoring programs be used to increase our understanding of regional and continental trends in large river assemblages? Open
Understanding trends in the diverse resources provided by large rivers will help balance tradeoffs among stakeholders and inform strategies to mitigate the effects of landscape scale stressors such as climate change and invasive species. A…
View article: Ichthyochory in a temperate river system by common carp (<i>Cyprinus carpio</i>)
Ichthyochory in a temperate river system by common carp (<i>Cyprinus carpio</i>) Open
Some fish are important dispersal vectors of aquatic plants (i.e., ichthyochory), yet few examples have been documented outside of the Neotropics. Although highly modified and degraded, the upper Illinois River Waterway supports common car…
View article: Ecological Recovery of a River Fish Assemblage following the Implementation of the Clean Water Act
Ecological Recovery of a River Fish Assemblage following the Implementation of the Clean Water Act Open
The twentieth century spanned an era that included nadirs in environmental quality and subsequent efforts to improve ecological conditions. The Illinois Waterway, a large river system in Illinois, experienced prolonged degradation followed…
View article: Hydrology controls recruitment of two invasive cyprinids: bigheaded carp reproduction in a navigable large river
Hydrology controls recruitment of two invasive cyprinids: bigheaded carp reproduction in a navigable large river Open
In the Mississippi River Basin of North America, invasive bigheaded carp (silver carp Hypophthalmichthys molitrix and bighead carp H. nobilis , also referred to as Asian carp) have spread rapidly over the past several decades. In the Illin…
View article: Echoes of a flood pulse: short-term effects of record flooding of the Illinois River on floodplain lakes under ecological restoration
Echoes of a flood pulse: short-term effects of record flooding of the Illinois River on floodplain lakes under ecological restoration Open
The flood pulse drives primary productivity, biotic communities, and abiotic processes in large river systems; however, the effects of floods on restored floodplain lakes and associated wetlands are poorly understood. Record flooding of th…
View article: The Nature Conservancy’s Emiquon Preserve Fish and Aquatic Vegetation Monitoring 9-Year (2007-2015) Report
The Nature Conservancy’s Emiquon Preserve Fish and Aquatic Vegetation Monitoring 9-Year (2007-2015) Report Open
The Emiquon Reserve maintains a growing and healthy assemblage of aquatic vegetation and fish, with little indication that non-native species are becoming dominant or degrading environmental conditions in the immediate future. Of 19 releva…
View article: Fish Indicators of Ecosystem Health: Upper Mississippi River System
Fish Indicators of Ecosystem Health: Upper Mississippi River System Open
Following the UMRRAnalysis Team’s recommendations, our reportdescribesthe development of backwater assemblage and migratory fish indicators and their responsessince the beginning of the UMRR LTRMdata collection. The data used for these ind…
View article: Estimating population size of largemouth bass and black crappie at The Nature Conservancy’s Emiquon Preserve prior to reconnection to the Illinois River
Estimating population size of largemouth bass and black crappie at The Nature Conservancy’s Emiquon Preserve prior to reconnection to the Illinois River Open
Prior to completion of the water control structure at The Nature Conservancy’s Emiquon Nature Preserve (Emiquon), a mark-recapture study was conducted on largemouth bass Micropterus salmoides and black crappie Pomoxis nigromaculatus to est…
View article: Long-Term Fish Monitoring in Large Rivers: Utility of “Benchmarking” across Basins
Long-Term Fish Monitoring in Large Rivers: Utility of “Benchmarking” across Basins Open
In business, benchmarking is a widely used practice of comparing your own business processes to those of other comparable companies and incorporating identified best practices to improve performance. Biologists and resource managers design…
View article: Characterization and management implications of silver carp (Hypophthalmichthys molitrix) jumping behavior in response to motorized watercraft
Characterization and management implications of silver carp (Hypophthalmichthys molitrix) jumping behavior in response to motorized watercraft Open
Harbours are known introduction foci of marine alien species.They act as recipients of new introductions and as sources for regional spread.We report on subtidal surveys of fouling communities from 14 harbours along the coastline of South …
View article: Long-term Survey and Assessment of Large-River Fishes in Illinois, 2015
Long-term Survey and Assessment of Large-River Fishes in Illinois, 2015 Open
3EXECUTIVE SUMMARYThis report presents a summary of those data collected during segment 28(2016-17) of the Long-term Survey and Assessment of Large-River Fishes in Illinois(LTEF), an annual survey by members of the Illinois Natural History…
View article: The Nature Conservancy's Emiquon Nature Preserve Fish and Aquatic Vegetation Monitoring Annual Report
The Nature Conservancy's Emiquon Nature Preserve Fish and Aquatic Vegetation Monitoring Annual Report Open
Key Ecological Attributes (KEA’s) for thefish and aquatic vegetation communities are used toevaluate theprogressof the restoration efforts at Thompson and Flag lakes of The Nature Conservancy’s Emiquon Nature Preserve.A total of 19 KEA cri…
View article: Estimating the Effects of Environmental Variables and Gear Type on the Detection and Occupancy of Large-River Fishes in a Standardized Sampling Program Using Multiseason Bayesian Mixture Models
Estimating the Effects of Environmental Variables and Gear Type on the Detection and Occupancy of Large-River Fishes in a Standardized Sampling Program Using Multiseason Bayesian Mixture Models Open
Sampling in non-wadeable rivers presents methodological challenges for monitoring fish species. Changing environmental conditions may affect the ability to accurately capture species (i.e., detection) and consequently may lead to inappropr…
View article: The long-term Illinois rivers fish population monitoring program 2014
The long-term Illinois rivers fish population monitoring program 2014 Open
This report presents a summary of those data collected during segment 26(2014-15) of the Long-term Illinois Rivers Fish Population Monitoring Program(LTEF), an annual survey executed by members of the Illinois Natural History Survey with f…
View article: The Nature Conservancy's Emiquon Preserve: Fish and Aquatic Vegetation Monitoring Annual Report SERIES INHS 2015 (2)
The Nature Conservancy's Emiquon Preserve: Fish and Aquatic Vegetation Monitoring Annual Report SERIES INHS 2015 (2) Open
Key Ecological Attributes (KEA’s) for the fish and aquatic vegetation communities have been identified as indicators to evaluate the progress of the restoration efforts at Thompson and Flag lakes of The Nature Conservancy’s Emiquon Preserv…