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Ecology and Evolutionary Biology

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Articles 1201 - 1230 of 1385

Full-Text Articles in Genetics and Genomics

Clonal Foraging In Perennial Wheatgrasses: A Strategy For Exploiting Patchy Soil Nutrients, L. D. Humphrey, D. A. Pyke Oct 1987

Clonal Foraging In Perennial Wheatgrasses: A Strategy For Exploiting Patchy Soil Nutrients, L. D. Humphrey, D. A. Pyke

Aspen Bibliography

1 Foraging by means of plasticity in placement of tillers in response to low- and high- nutrient patches was examined in the rhizomatous wheatgrass Elymus lanceolatus ssp. lanceolatus. Its ability to exploit soil nutrient patches was compared to that of the closely related but caespitose E. lanceolatus ssp. wawawaiensis. 2 Clones of 14 genets of each taxon were planted in boxes consisting of two 30 x 30 cm cells: the 'origin cell' where clones were planted, and the adjacent 'destination cell', with each cell containing soil with either low or high levels of nutrients. 3 The rhizomatous taxon, which can …

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Taxonomic Reevaluation Of Thamnophis Couchii (Serpentes: Colubridae), Douglas A. Rossman, Glenn R. Stewart Jul 1987

Taxonomic Reevaluation Of Thamnophis Couchii (Serpentes: Colubridae), Douglas A. Rossman, Glenn R. Stewart

Occasional Papers of the Museum of Natural Science, Louisiana State University

No abstract provided.

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Karyotypic Analysis Of Five Rodents And A Marsupial From Belize, Central America, David W. Burton, John W. Bickham, Hugh H. Genoways, Timothy J. Mccarthy May 1987

Karyotypic Analysis Of Five Rodents And A Marsupial From Belize, Central America, David W. Burton, John W. Bickham, Hugh H. Genoways, Timothy J. Mccarthy

University of Nebraska State Museum: Mammalogy Papers

Karyotypes and chromosomal banding patterns of six species of small mammals from Belize are presented and discussed in light of relevant data in the literature. Individuals of Heteromys desmarestianus had FN values of 72, which differs from previous reports. G-bands were obtained and compared to fluorescent bands (DAPI) and with the location of NOR sites. The karyotypes of Peromyscus mexicanus, Sigmodon hispidus, Oryzomys couesi, and Ototylomys phyllotis are identical to the karyotypes for these species described in the literature. Active NORs were located on four pairs of chromosomes in O. phyllotis and fluorescent bands obtained with the …

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Characteristics Of Successful Competitors: An Evaluation Of Potential Growth Rate In Two Cold Desert Tussock Grasses, Eissenstat D. M., Caldwell M. M. Jan 1987

Characteristics Of Successful Competitors: An Evaluation Of Potential Growth Rate In Two Cold Desert Tussock Grasses, Eissenstat D. M., Caldwell M. M.

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Within the first few weeks after seedling emergence, Agropyron desertorum, a more competitive tussock grass, had a much higher mean relative growth rate (RGR) than Agropyron spicatum, a very similar, but less competitive species. However, beyond the early seedling stage, the two grasses had a remarkably similar whole-plant RGR in hydroponic culture and aboveground RGR in glasshouse soil, if root temperatures were above approximately 12° C. At soil temperatures between 5 and 12° C, A. desertorum exhibited a 66% greater aboveground RGR than A. spicatum (P < 0.05). Both species responded similarly to warming soil temperatures. In the field, however, tiller growth rates were generally similar. Neither species showed marked tiller elongation until a couple of weeks after snowmelt, by which time soil temperatures, at least to a depth of 10 cm, were above 12° C for a significant portion of the day. Above-ground biomass accumulation over a three-year period indicated that both grasses had similar potential growth rates whereas Artemisia tridentata ssp. vaseyana, a common neighbor planted in the same plots, had a much greater potential growth rate. The greater competitive ability of adult A. desertorum, as compared to A. spicatum, cannot be attributed to appreciable differences in potential growth rates.

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Systematics And Redescription Of The Blackside Darter, Percina Maculata (Girard), Eugene C. Beckham, Iii Jun 1986

Systematics And Redescription Of The Blackside Darter, Percina Maculata (Girard), Eugene C. Beckham, Iii

Occasional Papers of the Museum of Natural Science, Louisiana State University

No abstract provided.

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Relationships Among Aspen, Fungi, And Ungulate Browsing In Colorado And Wyoming, John H. Hart Jan 1986

Relationships Among Aspen, Fungi, And Ungulate Browsing In Colorado And Wyoming, John H. Hart

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No abstract provided.

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Percina Jenkinsi, A New Species Of Logperch (Pisces, Percidae) From The Conasauga River, Tennessee And Georgia, Bruce A. Thompson Jul 1985

Percina Jenkinsi, A New Species Of Logperch (Pisces, Percidae) From The Conasauga River, Tennessee And Georgia, Bruce A. Thompson

Occasional Papers of the Museum of Natural Science, Louisiana State University

No abstract provided.

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Public Response To "Guidelines For Managing Aspen", Norbert V. Debyle Jan 1985

Public Response To "Guidelines For Managing Aspen", Norbert V. Debyle

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No abstract provided.

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Guidelines For Managing Aspen, The Aspen Panel Jan 1985

Guidelines For Managing Aspen, The Aspen Panel

Aspen Bibliography

No abstract provided.

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Aspen Community Types Of Nevada, W. F. Mueggler Jan 1985

Aspen Community Types Of Nevada, W. F. Mueggler

Aspen Bibliography

No abstract provided.

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Growth, Yield, And Enfor, Imre Bella Apr 1984

Growth, Yield, And Enfor, Imre Bella

Aspen Bibliography

Increasing public awareness about the state of forestry and concerns about present and future wood supplies are bringing about an intensification of forest management across the country.

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Aspen Management Guidelines For The Grand Mesa, Uncompahgre And Gunnison National Forest, Aspen Management Task Force Jan 1983

Aspen Management Guidelines For The Grand Mesa, Uncompahgre And Gunnison National Forest, Aspen Management Task Force

Aspen Bibliography

A task force was formed in late April 1983 for the purpose of developing guidelines for Aspen Management on the Grand Mesa, Uncompahgre and Gunnison National Forests.

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Joseph P. Reser's Review Of R. L. Kirk's Aboriginal Man Adapting: The Human Biology Of Australian Aborigines, Joseph P. Reser Sep 1982

Joseph P. Reser's Review Of R. L. Kirk's Aboriginal Man Adapting: The Human Biology Of Australian Aborigines, Joseph P. Reser

Pacific Studies

No abstract provided.

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A Remarkable New Species Of Salamander Allied To Bolitoglossa Altamazonica (Plethodontidae) From Southern Peru, David B. Wake, Arden H. Brame, Jr., Richard Thomas Mar 1982

A Remarkable New Species Of Salamander Allied To Bolitoglossa Altamazonica (Plethodontidae) From Southern Peru, David B. Wake, Arden H. Brame, Jr., Richard Thomas

Occasional Papers of the Museum of Natural Science, Louisiana State University

No abstract provided.

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Understory-Overstory Vegetation Relationships: An Annotated Bibliography, Peter F. Ffolliott, Warren P. Clary Jan 1982

Understory-Overstory Vegetation Relationships: An Annotated Bibliography, Peter F. Ffolliott, Warren P. Clary

Aspen Bibliography

No abstract provided.

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The Extent And Characteristics Of Low Productivity Aspen Areas In Minnesota, Garhard K. Raile, Jerold T. Hahn Jan 1982

The Extent And Characteristics Of Low Productivity Aspen Areas In Minnesota, Garhard K. Raile, Jerold T. Hahn

Aspen Bibliography

No abstract provided.

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An Experiment In Biomass Production: Results From Three Consecutive Harvests Of Cottonwood Alder, Constance A. Harrington, Dean S. Debell, Robert F. Strand Jan 1982

An Experiment In Biomass Production: Results From Three Consecutive Harvests Of Cottonwood Alder, Constance A. Harrington, Dean S. Debell, Robert F. Strand

Aspen Bibliography

No abstract provided.

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Biomass Equations For Ten Major Tree Species Of The Prairie, T. Singh Jan 1982

Biomass Equations For Ten Major Tree Species Of The Prairie, T. Singh

Aspen Bibliography

No abstract provided.

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Wildlife Conservation In The Soviet Union, Michael L. Wolfe, Douglas R. Weiner Jan 1982

Wildlife Conservation In The Soviet Union, Michael L. Wolfe, Douglas R. Weiner

Aspen Bibliography

No abstract provided.

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Wildlife--Wild Death: Kenya's Man-Animal Equation, Norman N. Miller Jan 1982

Wildlife--Wild Death: Kenya's Man-Animal Equation, Norman N. Miller

Aspen Bibliography

Kenya's game laws, in comparison to those of ancient England, are tame and mild.

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Sensory Head Pores And Canals In Goodeid Fishes, John Michael Fitzsimons Dec 1981

Sensory Head Pores And Canals In Goodeid Fishes, John Michael Fitzsimons

Occasional Papers of the Museum of Natural Science, Louisiana State University

No abstract provided.

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Geographic Variation In The Scrub Euphonia, Robert W. Dickerman Dec 1981

Geographic Variation In The Scrub Euphonia, Robert W. Dickerman

Occasional Papers of the Museum of Natural Science, Louisiana State University

No abstract provided.

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The Systematics And Biology Of The Genus Zapus (Mammalia, Rodentia, Zapodidae), Gwilym S. Jones Dec 1981

The Systematics And Biology Of The Genus Zapus (Mammalia, Rodentia, Zapodidae), Gwilym S. Jones

All-Inclusive List of Electronic Theses and Dissertations

This study was undertaken to determine specific and intraspecific relationships within the genus Zapus (Mammalia, Rodentia, Zapodidae). Subspecies are based on the biological subspecies concept where the subspecies is an evolutionary step between a population and species. Approximately 20,000 Recent specimens and representatives of fossil taxa were examined. Cranial and postcranial characteristics, colors, and when available bacula, sperms and karyotypes were incorporated into the morphological analyses. In addition, published biological data were summarized and analyzed for evidence of primary and secondary isolating mechanisms. Supplemental data were acquired during collection of 450 specimens in midwestern and western United States, western Canada, …

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Alternate Population Limitation Strategies For Feral Horses, Michael L. Wolfe Apr 1981

Alternate Population Limitation Strategies For Feral Horses, Michael L. Wolfe

Aspen Bibliography

No abstract provided.

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Physiological Research On Adventitious Shoot Development In Aspen, George A. Schier Jan 1981

Physiological Research On Adventitious Shoot Development In Aspen, George A. Schier

Aspen Bibliography

No abstract provided.

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Ecology And Regeneration Of Aspen In Relation To Managment, R.K. Tew Jan 1981

Ecology And Regeneration Of Aspen In Relation To Managment, R.K. Tew

Aspen Bibliography

No abstract provided.

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Tree Biomass Estimates For Minnesota's Aspen-Birch Forest Survey Unit, Gerhard K. Raile, Pamela J. Jakes Jan 1981

Tree Biomass Estimates For Minnesota's Aspen-Birch Forest Survey Unit, Gerhard K. Raile, Pamela J. Jakes

Aspen Bibliography

No abstract provided.

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Minnesota's Aspen Resource, Pamela J. Jakes Jan 1981

Minnesota's Aspen Resource, Pamela J. Jakes

Aspen Bibliography

No abstract provided.

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Muskrat Population Dynamics And Vegetation Utilization: A Management Plan, Thomas R. Mccabe, Michael L. Wolfe Aug 1980

Muskrat Population Dynamics And Vegetation Utilization: A Management Plan, Thomas R. Mccabe, Michael L. Wolfe

Aspen Bibliography

Muskrat (Ondatra zibethicus) populations are located in extensive marshes that are managed either privately or by state or federal refuge personnel. Maintenance of a balanced muskrat population is important to marsh management, therefore necessitating accurate density estimates. Feasibility of a vegetational utilization index as a reliable population indicator is being tested at Fish Springs NWR, Utah.

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Percina Gymnocephala, A New Percid Fish Of The Subgenus Alvordius, From The New River In North Carolina, Virginia, And West Virginia, Eugene C. Beckham, Iii Mar 1980

Percina Gymnocephala, A New Percid Fish Of The Subgenus Alvordius, From The New River In North Carolina, Virginia, And West Virginia, Eugene C. Beckham, Iii

Occasional Papers of the Museum of Natural Science, Louisiana State University

No abstract provided.

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