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- Bioassessment (2)
- Morone americana (2)
- Bird survey (1)
- Body shape; Lepomis cyanellus; Morone americana; morphometry; stunted fishes (1)
- Detection bias (1)
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- Dynamic population model (1)
- Endangered (1)
- Fish (1)
- Food limitation (1)
- IBI (1)
- Invasive (1)
- Invasive species (1)
- Multimetric (1)
- Nest predation (1)
- Non-indigenous (1)
- Nonparametric (1)
- Plants (1)
- Point count (1)
- Population management (1)
- Predation (1)
- Rank–abundance (1)
- Rare (1)
- Rare taxa (1)
- Rare. (1)
- Relative Risk Model (1)
- Relative abundance. (1)
- Residual basal area. (1)
- Streams (1)
- Stunting (1)
- Taxa richness (1)
Articles 1 - 11 of 11
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The Influence Of Partial Timber Harvesting In Riparian Buffers On Macroinvertebrate And Fish Communities In Small Streams In Minnesota, Usa, Christopher J. Chizinski, Bruce Vondracek, Charles R. Blinn, Raymond M. Newman, Dickson M. Atuke, Keith Fredricks, Nathaniel A. Hemstad, Eric Merten, Nicholas Schlesser
The Influence Of Partial Timber Harvesting In Riparian Buffers On Macroinvertebrate And Fish Communities In Small Streams In Minnesota, Usa, Christopher J. Chizinski, Bruce Vondracek, Charles R. Blinn, Raymond M. Newman, Dickson M. Atuke, Keith Fredricks, Nathaniel A. Hemstad, Eric Merten, Nicholas Schlesser
Nebraska Cooperative Fish and Wildlife Research Unit: Staff Publications
Relatively few evaluations of aquatic macroinvertebrate and fish communities have been published in peer-reviewed literature detailing the effect of varying residual basal area (RBA) after timber harvesting in riparian buffers. Our analysis investigated the effects of partial harvesting within riparian buffers on aquatic macroinvertebrate and fish communities in small streams from two experiments in northern Minnesota northern hardwood-aspen forests. Each experiment evaluated partial harvesting within riparian buffers. In both experiments, benthic macroinvertebrates and fish were collected 1 year prior to harvest and in each of 3 years after harvest. We observed interannual variation for the macroinvertebrate abundance, diversity and taxon …
A Modelling Approach To Evaluate Potential Management Actions Designed To Increase Growth Of White Perch In A High-Density Population, Christopher J. Chizinski, Kevin L. Pope, G.R. Wilde
A Modelling Approach To Evaluate Potential Management Actions Designed To Increase Growth Of White Perch In A High-Density Population, Christopher J. Chizinski, Kevin L. Pope, G.R. Wilde
Nebraska Cooperative Fish and Wildlife Research Unit: Staff Publications
A deterministic, age-structured population model was developed to simulate potential management scenarios designed to increase growth of individuals (quantified by maximum length) in a hypothetical population of white perch, Morone americana (Gmelin). Four scenarios were developed that included non-selective mortality of adult white perch, increased mortality of age groups most influential on population growth, increased age-0 mortality and inhibiting recruitment after spawning. The greatest increase in maximum length occurred with nonselective adult mortality when population biomass was reduced by 97%; lesser increases in maximum length were achieved with the other management scenarios. Populations returned to their original state after control …
Methods For Assessing Fish Populations, Kevin L. Pope, Steve E. Lochmann, Michael K. Young
Methods For Assessing Fish Populations, Kevin L. Pope, Steve E. Lochmann, Michael K. Young
Nebraska Cooperative Fish and Wildlife Research Unit: Staff Publications
Fisheries managers are likely to assess fish populations at some point during the fisheries management process. Managers that follow the fisheries management process (see Chapter 5) might find their knowledge base insufficient during the steps of problem identification or management action and must assess a population before appropriate actions can be taken. Managers will implement some type of assessment during the evaluation step as a means of measuring progress relative to objectives. Choosing how to assess a population is an important decision because managers strive to maximize their knowledge of a population while minimizing the time and money expended to …
The Index Of Biological Integrity And The Bootstrap: Can Random Sampling Error Affect Stream Impairment Decisions?, Christine L. Dolph, Aleksey Y. Sheshukov, Christopher J. Chizinski, Bruce Vondracek, Bruce N. Wilson
The Index Of Biological Integrity And The Bootstrap: Can Random Sampling Error Affect Stream Impairment Decisions?, Christine L. Dolph, Aleksey Y. Sheshukov, Christopher J. Chizinski, Bruce Vondracek, Bruce N. Wilson
Nebraska Cooperative Fish and Wildlife Research Unit: Staff Publications
Multimetric indices, such as the Index of Biological Integrity (IBI), are increasingly used bymanagement agencies to determine whether surface water quality is impaired. However, important questions about the variability of these indices have not been thoroughly addressed in the scientific literature. In this study, we used a bootstrap approach to quantify variability associated with fish IBIs developed for streams in two Minnesota river basins. We further placed this variability into a management context by comparing it to impairment thresholds currently used in water quality determinations for Minnesota streams. We found that 95% confidence intervals ranged as high as 40 points …
Methods For Assessing Fish Populations, Kevin L. Pope, Steve E. Lochmann, Michael K. Young
Methods For Assessing Fish Populations, Kevin L. Pope, Steve E. Lochmann, Michael K. Young
Nebraska Cooperative Fish and Wildlife Research Unit: Staff Publications
Fisheries managers are likely to assess fish populations at some point during the fisheries management process. Managers that follow the fisheries management process (see Chapter 5) might find their knowledge base insufficient during the steps of problem identification or management action and must assess a population before appropriate actions can be taken. Managers will implement some type of assessment during the evaluation step as a means of measuring progress relative to objectives. Choosing how to assess a population is an important decision because managers strive to maximize their knowledge of a population while minimizing the time and money expended to …
Evaluating Food Availability And Nest Predation Risk As Sources Of Bias In Aural Bird Surveys, Bruce A. Robertson, Richard L. Hutto, Joseph J. Fontaine
Evaluating Food Availability And Nest Predation Risk As Sources Of Bias In Aural Bird Surveys, Bruce A. Robertson, Richard L. Hutto, Joseph J. Fontaine
Nebraska Cooperative Fish and Wildlife Research Unit: Staff Publications
The use of aural surveys to estimate population parameters is widespread in avian studies.Despite efforts to increase the efficacy of this method, the potential for ecological context to bias population estimates remains largely unexplored. For example, food availability and nest predation risk can influence singing activity independent of density and, therefore, may bias aural estimates where these ecological factors vary systematically among habitats or other categories of ecological interest. We used a natural fire event in a mixed-conifer forest that experienced variation in fire severity (low, intermediate, and high) to determine if aural surveys produce accurate density estimates of Dark-eyed …
Implications Of Stunting On Morphology Of Freshwater Fishes, Christopher J. Chizinski, Kevin L. Pope, G.R. Wilde, R.E. Strauss
Implications Of Stunting On Morphology Of Freshwater Fishes, Christopher J. Chizinski, Kevin L. Pope, G.R. Wilde, R.E. Strauss
Nebraska Cooperative Fish and Wildlife Research Unit: Staff Publications
The purpose of this study was to assess morphological differences between stunted and non-stunted white perch Morone americana and green sunfish Lepomis cyanellus. Few female M. americana were captured; thus, morphological differences between adult males and juveniles were assessed for M. americana. Similarly, few immature (juvenile) L. cyanellus were captured for the stunted morphotype; thus, male and female morphological differences were assessed for L. cyanellus. Features of the head tended to be relatively larger in stunted fish of both species, whereas the mid-body tended to be relatively larger in non-stunted M. americana, but not in non-stunted …
The Effect Of Predation On Stunted And Nonstunted White Perch, Nathan J.C. Gosch, L. L. Pierce, Kevin L. Pope
The Effect Of Predation On Stunted And Nonstunted White Perch, Nathan J.C. Gosch, L. L. Pierce, Kevin L. Pope
Nebraska Cooperative Fish and Wildlife Research Unit: Staff Publications
Predation is widely regarded as a means to prevent or minimise the establishment of a stunted (high density of slow growing individuals) population. We investigated the effect of predation on two different white perch Morone americana populations (stunted and nonstunted) by examining the stomach contents of piscivorous fishes. White perch and gizzard shad dominated piscivore diets in Branched Oak Lake, whereas white perch dominated piscivore diets in Pawnee Lake. White perch consumed in the stunted population (Branched Oak Lake) were larger and older than white perch consumed in the nonstunted population (Pawnee Lake). Many of the consumed white perch in …
Food Habits Of Stunted And Non-Stunted White Perch (Marone Americana), Nathan J.C. Gosch, Jeffrey R. Stittle, Kevin L. Pope
Food Habits Of Stunted And Non-Stunted White Perch (Marone Americana), Nathan J.C. Gosch, Jeffrey R. Stittle, Kevin L. Pope
Nebraska Cooperative Fish and Wildlife Research Unit: Staff Publications
We studied food habits of white perch (Morone americana) from two populations with different stable states (stunted [Branched Oak Lake, Nebraska] and non-stunted [Pawnee Lake, Nebraska]) to determine if change in food habits of white perch is likely to occur in situations where a stunted while perch population is altered to a non-stunted state and vice versa. Three approaches were used to quantitatively describe seasonal (spring= March-May, summer= June-August, autumn = September-November) diets of white perch - 1) frequency of occurrence, 2) percentage of composition by volume, and 3) mean stomach fullness. White perch diets were dominated by …
The Impact Of Rare Taxa On A Fish Index Of Biotic Integrity, Haibo Wan, Christopher J. Chizinski, Christine L. Dolph, Bruce Vondracek, Bruce N. Wilson
The Impact Of Rare Taxa On A Fish Index Of Biotic Integrity, Haibo Wan, Christopher J. Chizinski, Christine L. Dolph, Bruce Vondracek, Bruce N. Wilson
Nebraska Cooperative Fish and Wildlife Research Unit: Staff Publications
The index of biotic integrity (IBI) is a commonly used bioassessment tool that integrates abundance and richness measures to assess water quality. In developing IBIs that are both responsive to human disturbance and resistant to natural variability and sampling error, water managersmust decide how to weigh information about rare and abundant taxa, which in turn requires an understanding of the sensitivity of indices to rare taxa. Herein, we investigated the influence of rare fish taxa (within the lower 5% of rank abundance curves) on IBI metric and total scores for stream sites in two of Minnesota’smajor river basins, the St. …
Risk Assessment: Simultaneously Prioritizing The Control Of Invasive Plant Species And The Conservation Of Rare Plant Species, Thaddeus K. Miller, Craig R. Allen, Wayne G. Landis, James W. Merchant
Risk Assessment: Simultaneously Prioritizing The Control Of Invasive Plant Species And The Conservation Of Rare Plant Species, Thaddeus K. Miller, Craig R. Allen, Wayne G. Landis, James W. Merchant
Nebraska Cooperative Fish and Wildlife Research Unit: Staff Publications
Although the consequences of the homogenization of Earth’s flora and fauna are not well understood, experts agree that biological invasions pose hazards to rare species. As a result, there is a need for a systematic approach to assess risks from invasive species. The Relative Risk Model can be adapted to assess combinations of rare species, invasive species, and regions. It also can be applied to different taxonomic groups and at different spatial scales. This flexibility makes it a promising tool for invasive species risk assessment. We used the Relative Risk Model to quantify risks posed to endangered plant species by …