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- Solenopsis invicta (5)
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- Micropterus salmoides (2)
- Papilio aristodemus (2)
Articles 31 - 60 of 101
Full-Text Articles in Other Environmental Sciences
Lure-Size Restrictions In Recreational Fisheries, Gene R. Wilde, Kevin L. Pope, Bart W. Durham
Lure-Size Restrictions In Recreational Fisheries, Gene R. Wilde, Kevin L. Pope, Bart W. Durham
Nebraska Cooperative Fish and Wildlife Research Unit: Staff Publications
We conducted angling experiments to examine the potential use of lure-size restrictions to effect or reinforce length limits. We used four sizes of lures and five color patterns to assess effects of lure size and color on the number and length of largemouth bass (Micropterus salmoides) captured by angling. There was a significant (F = 12.03; df = 1, 177; P = 0.0007) lure-size effect on the total length (TL) of captured largemouth bass. Catch rates of fish ≥305-mm TL ranged from 0 to 0.5 fish per hour and were unrelated to lure size. Lure color pattern had …
Development And Evaluation Of A Bioenergetics Model For The Inland Silverside In Freshwater Systems, Christopher J. Chizinski, Caleb G. Huber, Kevin L. Pope
Development And Evaluation Of A Bioenergetics Model For The Inland Silverside In Freshwater Systems, Christopher J. Chizinski, Caleb G. Huber, Kevin L. Pope
Nebraska Cooperative Fish and Wildlife Research Unit: Staff Publications
Consumption and respiration parameters were fit for inclusion in a bioenergetics model developed to predict the growth of the inland silverside Menidia beryllina. Although this model accurately predicted inland silverside growth through the initiation of spawning, it failed to predict the growth of reproductively active inland silversides. Model simulations provided initial evidence that a single model cannot predict the lifetime growth patterns of this species. Instead, a two-stage model is probably necessary to account for the physiological differences between the prespawning and active-spawning stages. In addition, the bioenergetics models of short-lived (life span,< 2 years) fishes may need to include a better means for assessing the direct energy expenditure for reproduction.
Power Laws, Discontinuities And Regional City Size Distributions, Ahjond S. Garmestani, Craig R. Allen, Colin M. Gallagher
Power Laws, Discontinuities And Regional City Size Distributions, Ahjond S. Garmestani, Craig R. Allen, Colin M. Gallagher
Nebraska Cooperative Fish and Wildlife Research Unit: Staff Publications
Urban systems are manifestations of human adaptation to the natural environment. City size distributions are the expression of hierarchical processes acting upon urban systems. In this paper, we test the entire city size distributions for the southeastern and southwestern United States (1990), as well as the size classes in these regions for power law behavior. We interpret the differences in the size of the regional city size distributions as the manifestation of variable growth dynamics dependent upon city size. Size classes in the city size distributions are snapshots of stable states within urban systems in flux.
The Role Of Protected Areas As Bird Stop-Over Habitat: Ecology And Habitat Utilization By Migrating Land Birds Within Colorado River Riparian Forests Of Southwestern North America, Charles Van Riper Iii, Kristina L. Paxton, Carena J. Van Riper, Kimberly A. Van Riper, Laura Mcgrath, J. J. Fontaine
The Role Of Protected Areas As Bird Stop-Over Habitat: Ecology And Habitat Utilization By Migrating Land Birds Within Colorado River Riparian Forests Of Southwestern North America, Charles Van Riper Iii, Kristina L. Paxton, Carena J. Van Riper, Kimberly A. Van Riper, Laura Mcgrath, J. J. Fontaine
Nebraska Cooperative Fish and Wildlife Research Unit: Staff Publications
In southwestern North America, riparian habitats have declined precipitously in the last century both within and outside protected areas such as national parks,U.S. Fish and Wildlife Service refuges, and Bureau of Land Management and biosphere reserve lands. These declines are primarily due to anthropogenic perturbations such as alterations in river flow regimes, agricultural conversion, livestock grazing, and urban expansion (Webb et al. 2003). In the southwestern United States and northwestern Mexico the decline of riparian habitat and loss of native cottonwood (Populus fremontii), willow (Salix gooddingii) gallery forests, and adjacent mesquite (Prosopis sp.) bosques has …
A Simple Model For Predicting Survival Of Angler-Caught And Released Largemouth Bass, Gene R. Wilde, Kevin L. Pope
A Simple Model For Predicting Survival Of Angler-Caught And Released Largemouth Bass, Gene R. Wilde, Kevin L. Pope
Nebraska Cooperative Fish and Wildlife Research Unit: Staff Publications
We conducted a controlled experiment in the laboratory to assess the influence of anatomical hooking location and water temperature on survival of angler-caught and released largemouth bass Micropterus salmoides. Survival was 98% (58 of 59 fish) among fish that were hand-hooked within the oral cavity (including the gills), whereas survival was 66% (33 of 50 fish) among fish that were hand-hooked in the esophagus. Survival of hooked fish was not significantly influenced by water temperature (7–27 °C) or the hooking location × water temperature interaction. We combined our results with prior research to develop a predictive model of largemouth bass …
Breeding Biology Of Passerines In A Subtropical Montane Forest In Northwestern Argentina, Sonya K. Auer, Ronald D. Bassar, Joseph J. Fontaine, Thomas E. Martin
Breeding Biology Of Passerines In A Subtropical Montane Forest In Northwestern Argentina, Sonya K. Auer, Ronald D. Bassar, Joseph J. Fontaine, Thomas E. Martin
Nebraska Cooperative Fish and Wildlife Research Unit: Staff Publications
The breeding ecology of south temperate bird species is less widely known than that of north temperate species, yet because they comprise a large portion of the world’s avian diversity, knowledge of their breeding ecology can contribute to a more comprehensive understanding of the geographic diversity of avian reproductive traits and life history strategies. We provide the first detailed examination of the reproductive strategies of 18 forest passerines of subtropical, northwestern Argentina. Mean clutch sizes were smaller and egg mass was greater than for north temperate birds, but differed among species and nest types, with cavity-nesters having larger clutches than …
Intraspecific Resource Partitioning By An Opportunistic Strategist, Inland Silverside Menidia Beryllina, Christopher J. Chizinski, C. G. Huber, M. Longoria, Kevin L. Pope
Intraspecific Resource Partitioning By An Opportunistic Strategist, Inland Silverside Menidia Beryllina, Christopher J. Chizinski, C. G. Huber, M. Longoria, Kevin L. Pope
Nebraska Cooperative Fish and Wildlife Research Unit: Staff Publications
Seasonal variation in prey consumption and food resource overlap was evident in an inland water body for mature male, mature female and immature inland silverside (Menidia beryllina). During the first growth phase marked by intensive somatic growth by immature inland silverside, few adults were present in the population (28% of total catch), thus minimizing intraspecific competition for food resources between juvenile and adult inland silverside. During the second growth phase by adults, few juvenile inland silverside were present (0% of total catch) in the population, again minimizing intraspecific competition for food resources between juvenile and adult inland silverside. …
Testing Ecological And Behavioral Correlates Of Nest Predation, Joseph J. Fontaine, Mireille Martel, Helen M. Markland, Alina M. Niklison, Karie L. Decker, Thomas E. Martin
Testing Ecological And Behavioral Correlates Of Nest Predation, Joseph J. Fontaine, Mireille Martel, Helen M. Markland, Alina M. Niklison, Karie L. Decker, Thomas E. Martin
Nebraska Cooperative Fish and Wildlife Research Unit: Staff Publications
Variation in nest predation rates among bird species are assumed to reflect differences in risk that are specific to particular nest sites. Theoretical and empirical studies suggest that parental care behaviors can evolve in response to nest predation risk and thereby differ among ecological conditions that vary in inherent risk. However, parental care also can influence predation risk. Separating the effects of nest predation risk inherent to a nest site from the risk imposed by parental strategies is needed to understand the evolution of parental care. Here we identify correlations between risks inherent to nest sites, and risk associated with …
A Test Of The Cross-Scale Resilience Model: Functional Richness In Mediterranean-Climate Ecosystems, Donald A. Wardwell, Craig R. Allen, Garry D. Peterson, Andrew J. Tyre
A Test Of The Cross-Scale Resilience Model: Functional Richness In Mediterranean-Climate Ecosystems, Donald A. Wardwell, Craig R. Allen, Garry D. Peterson, Andrew J. Tyre
Nebraska Cooperative Fish and Wildlife Research Unit: Staff Publications
Ecological resilience has been proposed to be generated, in part, in the discontinuous structure of complex systems. Environmental discontinuities are reflected in discontinuous, aggregated animal body mass distributions. Diversity of functional groups within body mass aggregations (scales) and redundancy of functional groups across body mass aggregations (scales) has been proposed to increase resilience. We evaluate that proposition by analyzing mammalian and avian communities of Mediterranean-climate ecosystems. We first determined that body mass distributions for each animal community were discontinuous. We then calculated the variance in richness of function across aggregations in each community, and compared observed values with distributions created …
Schoolyard Microclimate, Joseph J. Fontaine, Samuel C. Stier, Melissa L. Maggio, Karie L. Decker
Schoolyard Microclimate, Joseph J. Fontaine, Samuel C. Stier, Melissa L. Maggio, Karie L. Decker
Nebraska Cooperative Fish and Wildlife Research Unit: Staff Publications
The natural world exhibits substantial variation in climate, which influences the distribution, reproductive success, and survival of plants and animals. Although students are aware of weather, their understanding of climate is typically less clear, especially the concept of microclimate-the climate of a specific place within an area as contrasted with the climate of the entire area. Microclimate can influence where birds place their nests (Lloyd and Martin 2004), where insects reside (Lorenzo and Lazzari 1999), and where plants successfully germinate (Tomimatsu and Ohara 2004). Therefore, microclimate can have a profound effect on local community structure and biodiversity, particularly on …
Effect Of Catch-And-Release Angling On Growth And Survival Of Rainbow Trout, Oncorhynchus Mykiss, K. L. Pope, G. R. Wilde, D. W. Knabe
Effect Of Catch-And-Release Angling On Growth And Survival Of Rainbow Trout, Oncorhynchus Mykiss, K. L. Pope, G. R. Wilde, D. W. Knabe
Nebraska Cooperative Fish and Wildlife Research Unit: Staff Publications
Catch-and-release angling is popular in many parts of the world and plays an increasingly important role in fish conservation efforts. Although survival rates associated with catch-and-release angling are well documented for many species, sublethal effects have been less studied. An experiment was conducted to directly assess the effects of catch-and-release angling on growth and survival of rainbow trout, Oncorhynchus mykiss (Walbaum). Catch-and-release events were simulated in laboratory tanks maintained at 15–16 °C with hooks manually placed in pre-designated locations in the mouths of the fish. There were no differences in standard length (P= 0.59) or wet weight (P=0.81) gained between …
Status Of The Common Snook (Centropomus Undecimalis) In Texas, Kevin L. Pope, David R. Blankinship, Mark Fisher, Reynaldo Patiño
Status Of The Common Snook (Centropomus Undecimalis) In Texas, Kevin L. Pope, David R. Blankinship, Mark Fisher, Reynaldo Patiño
Nebraska Cooperative Fish and Wildlife Research Unit: Staff Publications
Catch data are summarized for common snook (Centropomus undecimalis) from 1975 through 2004 from the lower Laguna Madre, the only area along the Texas coast where common snook are routinely captured. Catch rates of common snook were low < 1 common snook per gill net set) and varied among years, as did size structure. Based on the catch rate and size structure data, the adult common snook population is characterized by low abundance and erratic recruitment (i.e., missing or extremely weak year-classes are common). Additional comments on the status of common snook in Texas are provided.
Sprawl And The Resilience Of Humans And Nature: An Introduction To The Special Feature, Craig R. Allen
Sprawl And The Resilience Of Humans And Nature: An Introduction To The Special Feature, Craig R. Allen
Nebraska Cooperative Fish and Wildlife Research Unit: Staff Publications
Human-driven change in land use and land cover is an accelerating global phenomenon with farreaching implications for food production, forest and water resources, the climate, and biogeochemical cycles (Foley et al. 2005). It affects the amount and configuration of habitat available for animals ranging from soil nematodes to elephants. It affects the provision of ecological goods and services for human beings. It affects the processes and function of ecosystems. “Sprawl”, as it has been termed, is exurban human land use change with a footprint exceeding the minimum required for the activity developed. It is that disproportionately large footprint that defines …
When Landscaping Goes Bad: The Incipient Invasion Of Mahonia Bealei In The Southeastern United States, Craig R. Allen, Ahjond S. Garmestani, Jill A. Labram, Amanda E. Peck, Luanna B. Prevost
When Landscaping Goes Bad: The Incipient Invasion Of Mahonia Bealei In The Southeastern United States, Craig R. Allen, Ahjond S. Garmestani, Jill A. Labram, Amanda E. Peck, Luanna B. Prevost
Nebraska Cooperative Fish and Wildlife Research Unit: Staff Publications
Woodlots are forest islands embedded within an urban matrix, and often represent the only natural areas remaining in suburban areas. Woodlots represent critical conservation areas for native plants, and are important habitat for wildlife in urban areas. Invasion by non-indigenous (NIS) plants can alter ecological structure and function, and may be especially severe in remnant forests where NIS propagule pressure is high. Woody shrubs in the Family Berberidaceae have been well documented as invaders of the forest–urban matrix in North America. Mahonia bealei (Berberidaceae) is a clonal shrub native to China, and is a popular ornamental in the Southeastern United …
Predictors Of Introduction Success In The South Florida Avifauna, Craig R. Allen
Predictors Of Introduction Success In The South Florida Avifauna, Craig R. Allen
Nebraska Cooperative Fish and Wildlife Research Unit: Staff Publications
Biological invasions are an increasing global challenge, for which single-species studies and analyses focused on testing single hypotheses of causation in isolation are unlikely to provide much additional insight. Species interact with other species to create communities, which derive from species interactions and from the interactions of species with the scale specific elements of the landscape that provide suitable habitat and exploitable resources. I used logistic regression analysis to sort among potential intrinsic, community and landscape variables that theoretically influence introduction success. I utilized the avian fauna of the Everglades of South Florida, and the variables body mass, distance to …
Life-History And Ecological Correlates Of Geographic Variation In Egg And Clutch Mass Among Passerine Species, Thomas E. Martin, R. D. Bassar, S. K. Bassar, J. J. Fontaine, P. Lloyd, H. A. Mathewson, A. M. Niklison, A. Chalfoun
Life-History And Ecological Correlates Of Geographic Variation In Egg And Clutch Mass Among Passerine Species, Thomas E. Martin, R. D. Bassar, S. K. Bassar, J. J. Fontaine, P. Lloyd, H. A. Mathewson, A. M. Niklison, A. Chalfoun
Nebraska Cooperative Fish and Wildlife Research Unit: Staff Publications
Broad geographic patterns in egg and clutch mass are poorly described, and potential causes of variation remain largely unexamined. We describe interspecific variation in avian egg and clutch mass within and among diverse geographic regions and explore hypotheses related to allometry, clutch size, nest predation, adult mortality, and parental care as correlates and possible explanations of variation. We studied 74 species of Passeriformes at four latitudes on three continents: the north temperate United States, tropical Venezuela, subtropical Argentina, and south temperate South Africa. Egg and clutch mass increased with adult body mass in all locations, but differed among locations for …
Multiple Hypotheses Testing Of Fish Incidence Patterns In An Urbanized Ecosystem, Christopher J. Chizinski, C.L. Higgins, C.E. Shavlik, Kevin L. Pope
Multiple Hypotheses Testing Of Fish Incidence Patterns In An Urbanized Ecosystem, Christopher J. Chizinski, C.L. Higgins, C.E. Shavlik, Kevin L. Pope
Nebraska Cooperative Fish and Wildlife Research Unit: Staff Publications
Ecological and evolutionary theories have focused traditionally on natural processes with little attempt to incorporate anthropogenic influences despite the fact that humans are such an integral part of virtually all ecosystems. A series of alternate models that incorporated anthropogenic factors and traditional ecological mechanisms of invasion to account for fish incidence patterns in urban lakes was tested. The models were based on fish biology, human intervention, and habitat characteristics. However, the only models to account for empirical patterns were those that included fish invasiveness, which incorporated speciesspecific information about overall tolerance and fecundity. This suggests that species-specific characteristics are more …
Temperature-Caused Fish Kill In A Flowing Great Plains River, Bart W. Durham, Gene R. Wilde, Kevin L. Pope
Temperature-Caused Fish Kill In A Flowing Great Plains River, Bart W. Durham, Gene R. Wilde, Kevin L. Pope
Nebraska Cooperative Fish and Wildlife Research Unit: Staff Publications
On 9 July 2002, while sampling a flowing segment of the North Fork Ninnescah River 10 km upstream from Cheney Reservoir, Reno County, Kansas, we observed and collected dead and dying specimens of 5 fish species. We attribute the fish kill to high water temperature, which reached 38.0°C on this day.
A Framework For Spatial Risk Assessments: Potential Impacts Of Nonindigenous Invasive Species On Native Species, Craig R. Allen, Alan R, Johnson, Leslie Parris
A Framework For Spatial Risk Assessments: Potential Impacts Of Nonindigenous Invasive Species On Native Species, Craig R. Allen, Alan R, Johnson, Leslie Parris
Nebraska Cooperative Fish and Wildlife Research Unit: Staff Publications
Many populations of wild animals and plants are declining and face increasing threats from habitat fragmentation and loss as well as exposure to stressors ranging from toxicants to diseases to invasive nonindigenous species. We describe and demonstrate a spatially explicit ecological risk assessment that allows for the incorporation of a broad array of information that may influence the distribution of an invasive species, toxicants, or other stressors, and the incorporation of landscape variables that may influence the spread of a species or substances. The first step in our analyses is to develop species models and quantify spatial overlap between stressor …
Multimodel Inference And The Understanding Of Complexity, Discontinuity, And Normadism, Craig R. Allen, Denis A. Saunders
Multimodel Inference And The Understanding Of Complexity, Discontinuity, And Normadism, Craig R. Allen, Denis A. Saunders
Nebraska Cooperative Fish and Wildlife Research Unit: Staff Publications
Nomadism has received surprisingly little attention in the ecological literature, and further work in this area is needed. The results of Woinarski’s reanalysis of our research findings are broadly similar to our own, and they support our original interpretation. However, his presentation is confusing and difficult to interpret.We used an information-theoretic approach to multimodel selection. We a priori defined plausible candidate models relating the variables described in our original paper or Woinarski’s reanalysis to the phenomenon of nomadism. We tested models that investigate nomadism as a function of nectivory, granivory, diet diversity, mixed diet, distance to body mass aggregation edge, …
Firm Size Diversity, Functional Richness, And Resilience, Ahjond S. Garmestani, Craig R. Allen, John D. Mittelstaedt, Craig A. Stow, William A. Ward
Firm Size Diversity, Functional Richness, And Resilience, Ahjond S. Garmestani, Craig R. Allen, John D. Mittelstaedt, Craig A. Stow, William A. Ward
Nebraska Cooperative Fish and Wildlife Research Unit: Staff Publications
This paper applies recent advances in ecology to our understanding of firm development, sustainability, and economic development. The ecological literature indicates that the greater the functional richness of species in a system, the greater its resilience – that is, its ability to persist in the face of substantial changes in the environment. This paper focuses on the effects of functional richness across firm size on the ability of industries to survive in the face of economic change. Our results indicate that industries with a richness of industrial functions are more resilient to employment volatility.
Parent Birds Assess Nest Predation Risk And Adjust Their Reproductive Strategies, J. J. Fontaine, T. E. Martin
Parent Birds Assess Nest Predation Risk And Adjust Their Reproductive Strategies, J. J. Fontaine, T. E. Martin
Nebraska Cooperative Fish and Wildlife Research Unit: Staff Publications
Avian life history theory has long assumed that nest predation plays a minor role in shaping reproductive strategies. Yet, this assumption remains conspicuously untested by broad experiments that alter environmental risk of nest predation, despite the fact that nest predation is a major source of reproductive failure. Here, we examined whether parents can assess experimentally reduced nest predation risk and alter their reproductive strategies. We experimentally reduced nest predation risk and show that in safer environments parents increased investment in young through increased egg size, clutch mass, and the rate they fed nestlings. Parents also increased investment in female condition …
Habitat Selection Responses Of Parents To Offspring Predation Risk: An Experimental Test, J. J. Fontaine, T. E. Martin
Habitat Selection Responses Of Parents To Offspring Predation Risk: An Experimental Test, J. J. Fontaine, T. E. Martin
Nebraska Cooperative Fish and Wildlife Research Unit: Staff Publications
The ability of nest predation to influence habitat settlement decisions in birds is widely debated, despite its importance in limiting fitness. Here, we experimentally manipulated nest predation risk across a landscape and asked the question, do migratory birds assess and respond to variation in nest predation risk when choosing breeding habitats? We examined habitat preference by quantifying the density and settlement date of eight species of migratory passerines breeding in areas with and without intact nest predator communities. We found consistently more individuals nesting in areas with reduced nest predation than in areas with intact predator assemblages, although predation risk …
Red Imported Fire Ant Impacts On Wildlife: A Decade Of Research, C. R. Allen, D. M. Epperson, A. S. Garmestani
Red Imported Fire Ant Impacts On Wildlife: A Decade Of Research, C. R. Allen, D. M. Epperson, A. S. Garmestani
Nebraska Cooperative Fish and Wildlife Research Unit: Staff Publications
The negative impacts of biological invasion are economically and ecologically significant and, while incompletely quantified, they are clearly substantial. Ants (family Formicidae) are an important, although often overlooked, component of many terrestrial ecosystems. Six species of ants are especially striking in their global ability to invade, and their impacts. This paper focuses on the impacts of the most destructive of those species, the red imported fire ant (Solenopsis invicta), and focuses on impacts on native vertebrates. Red imported fire ants often become the dominant ant species in infested areas outside of their native range due to their aggressive …
Effect Of Catch-And-Release Angling On Growth Of Largemouth Bass, Micropterus Salmoides, K. L. Pope, G. R. Wilde
Effect Of Catch-And-Release Angling On Growth Of Largemouth Bass, Micropterus Salmoides, K. L. Pope, G. R. Wilde
Nebraska Cooperative Fish and Wildlife Research Unit: Staff Publications
Catch-and-release angling is popular in many parts of the world and plays an increasingly important role in management of recreational fisheries. Although the magnitude of catch-and-release mortality is well documented for many species, potential sublethal effects have been little studied. An experiment was conducted to assess directly the effects of catch-and-release angling on growth of largemouth bass, Micropterus salmoides Lacépède. Angling mortality was 0.00 ± 0.092% for largemouth bass caught on plastic grubs. There was no difference (P = 0.57) in weight gain between caught and uncaught fish over a 40-day angling and recovery period. Although catch-and-release angling appears to …
Age-Specific Patterns In Density-Dependent Growth Of White Crappie, Pomoxis Annularis, K. L. Pope, G. R. Wilde, B. W. Durham
Age-Specific Patterns In Density-Dependent Growth Of White Crappie, Pomoxis Annularis, K. L. Pope, G. R. Wilde, B. W. Durham
Nebraska Cooperative Fish and Wildlife Research Unit: Staff Publications
The relationship between growth in white crappie, Pomoxis annularis Rafinesque, and climate, lake morphometry and population density was studied in 103 Texas reservoirs. Growth of age-0 through age-3 white crappie was significantly (P≤ 0.05) related to latitude, growing season and surface area. Growth of age-1 through age-5 white crappie also was related to annual precipitation. Multiple linear regression models with precipitation and mean catch per unit effort (CPUE) of white crappie as independent variables explained 14–22% of the variation in growth of age-0, -1 and -2 white crappie. By contrast, growth of age-3, -4 and -5 white crappie was unrelated …
Anglers’ Probabilities Of Catching Record-Size Fish, Gene R. Wilde, Kevin L. Pope
Anglers’ Probabilities Of Catching Record-Size Fish, Gene R. Wilde, Kevin L. Pope
Nebraska Cooperative Fish and Wildlife Research Unit: Staff Publications
Most state fishery management agencies publish lists of the largest (e.g., 10, 25, and 50) specimens of each species captured by anglers. We fitted normal
distributions for smallmouth bass Micropterus dolomieu and striped bass Morone saxatilis and a mixture of two normal distributions of largemouth bass Micropterus salmoides to the length of time that individual fish had been present on lists of the largest 50 specimens of each species caught by Texas anglers using rod and reel. In any given year, there is only a probability (p) of 0.102 that a largemouth bass large enough to make the recordweight list …
Relationship Between Lake-Record Weights Of Fishes And Reservoir Area And Growing Season, Gene R. Wilde, Kevin L. Pope
Relationship Between Lake-Record Weights Of Fishes And Reservoir Area And Growing Season, Gene R. Wilde, Kevin L. Pope
Nebraska Cooperative Fish and Wildlife Research Unit: Staff Publications
We used information from an angler recognition program to assess the relationship between lake-record weights of freshwater fishes captured by Texas anglers and two predictors of fish production and growth: reservoir surface area and growing-season length. The lake-record weights of two species, largemouth bass Micropterus salmoides and flathead catfish Pylodictis olivaris, were directly related to the logarithm of surface area. The record weights of all species studied were unrelated to growing-season length. Regardless of the statistical significance of individual correlations, there was a significant excess of positive correlations across all species between lake-record weights of fish and log surface area. …
Importance Of Food Ration And Water Temperature On Growth Of Juvenile Green Sunfish (Lepomis Cyanellus), Christopher J. Chizinski, Kevin L. Pope
Importance Of Food Ration And Water Temperature On Growth Of Juvenile Green Sunfish (Lepomis Cyanellus), Christopher J. Chizinski, Kevin L. Pope
Nebraska Cooperative Fish and Wildlife Research Unit: Staff Publications
A randomized design was used to test the difference in growth rates of juvenile green sunfish (Lepomis cyanellus) subjected to three treatments (food ration, temperature and salinity). Food ration and water temperature were similarly important in affecting growth of juvenile green sunfish. Juvenile green sunfish were found to accomplish similar growth with scarce food and optimum temperature as with abundant food and sub-optimum temperature. This equal and independent relation to biotic and abiotic factors should be expected in a ubiquitous generalist species, such as green sunfish.
Estimation Of Fishing Tournament Mortality And Its Sampling Variance, Gene R. Wilde, Kevin L. Pope, Richard E. Strauss
Estimation Of Fishing Tournament Mortality And Its Sampling Variance, Gene R. Wilde, Kevin L. Pope, Richard E. Strauss
Nebraska Cooperative Fish and Wildlife Research Unit: Staff Publications
The mortality of fish captured in fishing tournaments has commonly been estimated incorrectly and, thus far, only one account has presented an estimate of the standard error or confidence interval for tournament-associated mortality. In this article we describe methods for estimating the initial, delayed, and total mortality of tournament-caught fish and provide formulae for estimating the sampling variances of these estimates. The absence of such estimates from previous studies may explain an observed lack of change in tournament-associated mortality between the 1980s and the 1990s. Our methods provide insight into the design of studies of tournament-associated mortality and suggest, for …