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Extensions Of Local Domains With Trivial Generic Fiber, William Heinzer, Christel Rotthaus, Sylvia Wiegand
Extensions Of Local Domains With Trivial Generic Fiber, William Heinzer, Christel Rotthaus, Sylvia Wiegand
Nebraska Cooperative Fish and Wildlife Research Unit: Staff Publications
We consider injective local maps from a local domain R to a local domain S such that the generic fiber of the inclusion map R -> S is trivial, that is P R (0) for every nonzero prime ideal P of S. We present several examples of injective local maps involving power series that have or fail to have this property. For an extension R -> S having this property, we give some results on the dimension of S; in some cases we show dim S = 2 and in some cases dim S = 1.
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 …
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 …
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 …
Climate-Induced Forest Dieback As An Emergent Global Phenomenon, Craig Allen, David D. Breshears
Climate-Induced Forest Dieback As An Emergent Global Phenomenon, Craig Allen, David D. Breshears
Nebraska Cooperative Fish and Wildlife Research Unit: Staff Publications
An organized oral session at the annual meeting of the Ecological Society of America in San Jose, Calif., posed this question: Is climate-induced drought stress triggering increasing rates and unusual patterns of forest die-off at a global scale? Twenty-nine researchers representing five continents reported on patterns, mechanisms, and projections of forest mortality.
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. …
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 …