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Articles 211 - 240 of 459

Full-Text Articles in Physiology

Life History And Ecology Of The Great Basin Sagebrush Swift, Sceloporus Graciosus Graciosus Baird And Girard, 1852, Gary L. Burkholder, Wilmer W. Tanner Dec 1974

Life History And Ecology Of The Great Basin Sagebrush Swift, Sceloporus Graciosus Graciosus Baird And Girard, 1852, Gary L. Burkholder, Wilmer W. Tanner

Brigham Young University Science Bulletin, Biological Series

No abstract provided.


End Matter, Vol. 19 No. 5 Dec 1974

End Matter, Vol. 19 No. 5

Brigham Young University Science Bulletin, Biological Series

No abstract provided.


Front Matter, Vol. 19 No. 5 Dec 1974

Front Matter, Vol. 19 No. 5

Brigham Young University Science Bulletin, Biological Series

No abstract provided.


End Matter, Vol. 19 No. 4 Apr 1974

End Matter, Vol. 19 No. 4

Brigham Young University Science Bulletin, Biological Series

No abstract provided.


Front Matter, Vol. 19 No. 4 Apr 1974

Front Matter, Vol. 19 No. 4

Brigham Young University Science Bulletin, Biological Series

No abstract provided.


End Matter, Vol. 19 No. 3 Apr 1974

End Matter, Vol. 19 No. 3

Brigham Young University Science Bulletin, Biological Series

No abstract provided.


Front Matter, Vol. 19 No. 3 Apr 1974

Front Matter, Vol. 19 No. 3

Brigham Young University Science Bulletin, Biological Series

No abstract provided.


A Comparison Of Meteorologic Measurements From Irrigated And Non-Irrigated Plots, Provo, Ut, 1970–1972, Ferron L. Andersen, Phil D. Wright, J. Carl Fox Apr 1974

A Comparison Of Meteorologic Measurements From Irrigated And Non-Irrigated Plots, Provo, Ut, 1970–1972, Ferron L. Andersen, Phil D. Wright, J. Carl Fox

Brigham Young University Science Bulletin, Biological Series

A comparative study of micrometeorologic conditions on irrigated and non-irrigated pasture plots was conducted at Provo, Utah, from 1970 to 1972. Daily measurements were taken of the following: precipitation cither as rain or snow, new snowfall and total snow depth during the winter; relative humidity in a standard weather shelter; number of hours at maximum relative humidity; cloud cover each morning; potential evaporation; total wind 1 m above ground level; temperature extremes in a standard weather shelter; and temperatures both on irrigated and non-irrigated plots with sensing devices located 5 cm beneath soil surface under grass cover, at soil surface …


A Taxonomic Study Of The Western Collared Lizards, Crotaphytus Collaris And Crotaphytus Insularis, Nathan M. Smith, Wilmer W. Tanner Apr 1974

A Taxonomic Study Of The Western Collared Lizards, Crotaphytus Collaris And Crotaphytus Insularis, Nathan M. Smith, Wilmer W. Tanner

Brigham Young University Science Bulletin, Biological Series

The heterogeneous nature of the collared lizards west of the Colorado River prompted this study. Samples from known populations of C. c. auriceps, C. c. baileyi, and C. c. fruscus were used as a base for defining the western populations. External morphology and cranial morphology were compared by cluster, canonical, and discriminant analyses.

Results of these analyses show a western complex of four populations which are distinct from the three base populations of the collaris complex. Members within the western complex are distinguishable with at least 90 percent reliability by discriminant analysis. Because of intergradation patterns seen in western Sonora, …


End Matter, Vol. 19 No. 2 Mar 1974

End Matter, Vol. 19 No. 2

Brigham Young University Science Bulletin, Biological Series

No abstract provided.


Taxonomy Of The Genus Chloris (Gramineae), Dennis E. Anderson Mar 1974

Taxonomy Of The Genus Chloris (Gramineae), Dennis E. Anderson

Brigham Young University Science Bulletin, Biological Series

This study is a worldwide taxonomic treatment utilizing endomorphic characters such as cytology, histology, and embryology, in addition to the traditional exomorphic features. New chromosome numbers and histological information are reported. Relationships between Chloris and other genera in the Chlorideae are discussed. A total of 56 species is recognized in the genus; each is described and illustrated. Complete synonymies are included as well as a list of unidentified or rejected names. Distributions and maps are given for each species, along with lists of specimens examined during studies at various herbaria. Reports of field studies involving introgression among certain species are …


Front Matter, Vol. 19 No. 2 Mar 1974

Front Matter, Vol. 19 No. 2

Brigham Young University Science Bulletin, Biological Series

No abstract provided.


Front Matter, Vol. 19 No. 1 Jan 1974

Front Matter, Vol. 19 No. 1

Brigham Young University Science Bulletin, Biological Series

No abstract provided.


New Species Of American Bark Beetles (Scolytidae, Coleoptera), Stephen L. Wood Jan 1974

New Species Of American Bark Beetles (Scolytidae, Coleoptera), Stephen L. Wood

Brigham Young University Science Bulletin, Biological Series

The following 156 species of American Scolytidae are described as new to science: Cnesinus reticulus (Venezuela), C. beaveri (Brazil), C. teretis (Venezuela), C. alienus (Venezuela), C. deperditus (Colombia), C. fulgens (Venezuela), C. fulgidus (Colombia), C. lucaris (Venezuela), C. triangularis (Colombia), C. brighti (Mexico), C. coracinus (Mexico), Bothrosternus lucidus (Brazil), Hylastes niger (Mexico), Xylechinus mexicanus (Mexico), Phloeotribus nanus (Brazil), Chramesus corniger (Mexico), Ch. disparilis (Mexico), Ch. variabilis (Mexico), Ch. microporosus (Mexico), Ch. aquilus (Mexico), Ch. wisteriae (Mississippi), Ch. marginatus (Mexico), Carphoborus piceae (Oregon), Carphobius cupressi (Guatemala), Cladoctonus atrocis (Brazil), Scolytodes canalis (Mexico), S. costabilis (Mexico), Pseudothysanoes contrarius (Mexico), P. recavus (Mexico), …


End Matter, Vol. 19 No. 1 Jan 1974

End Matter, Vol. 19 No. 1

Brigham Young University Science Bulletin, Biological Series

No abstract provided.


Cytotypes And Morphometrics Of Two Phyllostomatid Bats, Micronycteris Hirsuta And Vampyressa Pusilla, Robert J. Baker, Hugh H. Genoways, William J. Bleier, Jerry W. Warner Dec 1973

Cytotypes And Morphometrics Of Two Phyllostomatid Bats, Micronycteris Hirsuta And Vampyressa Pusilla, Robert J. Baker, Hugh H. Genoways, William J. Bleier, Jerry W. Warner

University of Nebraska State Museum: Mammalogy Papers

As pointed out by Jackson (1971) and Patton (1972), the key to understanding mechanisms of chromosomal evolution lies in studies of chromosomal variation within populations that can hybridize. Hybrids between cytotypes contain the answer to problems of meiotic pairing and reduced fertility, as well as information concerning the nature of zones of contact. However, before detailed studies can be initiated, chromosomal races and hybrid zones must be located. Few chromosomal races have been described for bats (Baker, 1970a). Within the family Vespertilionidae, five species are known to have such races (Baker, 1970a) and races have been reported in two species …


Front Matter, Vol. 18 No. 4 Jul 1973

Front Matter, Vol. 18 No. 4

Brigham Young University Science Bulletin, Biological Series

No abstract provided.


End Matter, Vol. 18 No. 4 Jul 1973

End Matter, Vol. 18 No. 4

Brigham Young University Science Bulletin, Biological Series

No abstract provided.


Effects Of A Nuclear Detonation On Arthropods At The Nevada Test Site, Dorald M. Allred Jul 1973

Effects Of A Nuclear Detonation On Arthropods At The Nevada Test Site, Dorald M. Allred

Brigham Young University Science Bulletin, Biological Series

Fifty-three arthropod species were studied in an area affected by an underground nuclear detonation. These were represented by 10 species of ants, 17 beetles, 5 orthopterans, 4 scorpions, 6 solpugids, and 11 spiders (Table 16). Relative populations were determined prior to the detonation and at three periods after the detonation–(1) one and two months after (August and September 1962), (2) 11 months after (June 1963), and (3) 13 months after (August 1963). One and two months after the detonation, the number of species was reduced from the expected by 48 percent, by 52 percent after 11 months, and by 66 …


An Ecological Survey Of The Algae Of Huntington Canyon, Utah, Lorin E. Squires, Samuel R. Rushforth, Carol J. Endsley Jun 1973

An Ecological Survey Of The Algae Of Huntington Canyon, Utah, Lorin E. Squires, Samuel R. Rushforth, Carol J. Endsley

Brigham Young University Science Bulletin, Biological Series

A quantitative and ecological study of the algae of Huntington Canyon, Emery County, Utah, was conducted from March 1971 to April 1972. Net plankton, nannoplankton, periphyton, and visible attached algae were studied. Certain physical and chemical parameters in the waters of Huntington Creek and a small pond along its course were also measured.

Huntington Creek contains a wide diversity of genera and species of algae. Diatoms are the main constituent of the flora of this stream throughout the year. Hydrurus foetidus is prevalent in Huntington Creek from late winter to early summer, and filamentous blue green algae abound in the …


End Matter, Vol. 18 No. 1 Jun 1973

End Matter, Vol. 18 No. 1

Brigham Young University Science Bulletin, Biological Series

No abstract provided.


End Matter, Vol. 18 No. 2 Jun 1973

End Matter, Vol. 18 No. 2

Brigham Young University Science Bulletin, Biological Series

No abstract provided.


Front Matter, Vol. 18 No. 2 Jun 1973

Front Matter, Vol. 18 No. 2

Brigham Young University Science Bulletin, Biological Series

No abstract provided.


The Peregrine Falcon In Utah, Emphasizing Ecology And Competition With The Prairie Falcon, Richard D. Porter, Clayton M. White Jun 1973

The Peregrine Falcon In Utah, Emphasizing Ecology And Competition With The Prairie Falcon, Richard D. Porter, Clayton M. White

Brigham Young University Science Bulletin, Biological Series

This study was undertaken to record the known history of the Peregrine Falcon (Falco peregrinus) in Utah as we have been able to construct it from both the literature and from our original research that extends over about a 30-year period in the state. The present total population of the peregrine in Utah is possibly only 10 percent of what it has been in historic times. In an effort to find explanations for the decline, we have explored hypotheses of climatic changes, impact of pesticides, disease, and human disturbances. We conclude that pesticide contamination and climatic changes may …


Front Matter, Vol. 18 No. 3 Jun 1973

Front Matter, Vol. 18 No. 3

Brigham Young University Science Bulletin, Biological Series

No abstract provided.


Breeding Ecology Of Raptors In The Eastern Great Basin Of Utah, Dwight G. Smith, Joseph R. Murphy Jun 1973

Breeding Ecology Of Raptors In The Eastern Great Basin Of Utah, Dwight G. Smith, Joseph R. Murphy

Brigham Young University Science Bulletin, Biological Series

A comparative study of the breeding ecology of 12 raptor species was conducted in the eastern Great Basin from 1967-1970. The project was designed to determine the composition and densities, habitat selection, territoriality and predatory habits of raptorial birds in a semiarid environment. All topics were analyzed comparatively, relating the requirements and activities of the 12 raptor species.

Average yearly population densities of all species approximated 0.5 pairs per square mile, but much of the available habitat was not utilized. Predominant raptors were the Ferruginous Hawk and Great Horned Owl. Other important raptors included the Golden Eagle, Red-tailed Hawk and …


Front Matter, Vol. 18 No. 1 Jun 1973

Front Matter, Vol. 18 No. 1

Brigham Young University Science Bulletin, Biological Series

No abstract provided.


End Matter, Vol. 18 No. 3 Jun 1973

End Matter, Vol. 18 No. 3

Brigham Young University Science Bulletin, Biological Series

No abstract provided.


The Effects Of Crowding On The Diurnal Ascorbic Acid Levels Of Albino Rats, Mary Jo Barr Jan 1973

The Effects Of Crowding On The Diurnal Ascorbic Acid Levels Of Albino Rats, Mary Jo Barr

Masters Theses

The adrenal physiology of the albino rat was studied through the measurement of adrenal ascorbic acid levels. A cyclic phenomenon was observed which follows the diel periodicity of the animal. Ascorbic acid values were found to be characteristically higher in males than in females. A similar difference was also seen in populations divided into young animals (body weight less than 175 grams) and old animals (body weight greater than 175 grams). Crowding, induced by manipulating the area of cage space per gram of body weight, was observed to be a definite stressor and caused the adrenal ascorbic acid levels to …


The Effects Of Acute Stress On Adrenal Ascorbic Acid Levels, Robert Joseph Collier Jan 1973

The Effects Of Acute Stress On Adrenal Ascorbic Acid Levels, Robert Joseph Collier

Masters Theses

The diurnal rhythm of adrenal ascorbic acid (DAR) displays an inverse relationship to the diurnal rhythm of circulating levels of plasma corticosteroids. Alloxan monohydrate, 175 mg/kg body weight was given subcutaneously to albino rats to determine the effect of the diabetic state on the DAR. A total of 200 female albino rats were divided into two study groups. Study Group I was composed of 150 animals divided into populations of 15, each including 3 controls. Study Group II was composed of populations of 5, each group containing all controls or all alloxinated rats. The populations of 15 were sacrificed at …