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Articles 691 - 714 of 714

Full-Text Articles in Biology

New Species Of Pectis (Asteraceae) From The West Indies, Mexico, And South America, David J. Keil Jan 1984

New Species Of Pectis (Asteraceae) From The West Indies, Mexico, And South America, David J. Keil

Biological Sciences

Four new species of Peetis are described: P. ericifolia from Barbuda, P. luckoviae from west-central Mexico, P. arida from Ecuador and Peru, and P. cajamarcana from Peru. Chromosome counts for P. erieifolza (n = 48) and P. luekoviae (n = 12) are presented. Relationships of the newly described taxa are discussed.

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A Black Marlin, Makaira Indica, From The Early Pleistocene Of The Philippines And The Zoogeography Of Istiophorid Billfishes, Harry L. Fierstine, Bruce J. Welton Jul 1983

A Black Marlin, Makaira Indica, From The Early Pleistocene Of The Philippines And The Zoogeography Of Istiophorid Billfishes, Harry L. Fierstine, Bruce J. Welton

Biological Sciences

A nearly complete articulated head (including pectoral and pelvic girdles and fins) was collected from an Early Pleistocene, upper bathyal, volcanic ash deposit on Tambac Island, Northwest Central Luzon, Philippines. The specimen was positively identified because of its general resemblance to other large marlins and by its rigid pectoral fin, a characteristic feature of the black marlin. This is the first fossil billfish described from Asia and the first living species of billfish positively identified in the fossil record. The geographic distribution of the two living species of Makaira is discussed, Except for fossil localities bordering the Mediterranean Sea, the …

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The Hairless-Obese Mouse, William D. Stansfield Nov 1981

The Hairless-Obese Mouse, William D. Stansfield

Biological Sciences

Viable mice homozygous for two recessive autosomal genes, hairless (hr) and obese (ob) were produced with an average life span of 538 ± 34.1 days. On the average, hairless-obese mice weighed about 73 percent as much as obese mice. Since obese mice consumed approximately 73 percent as much oxygen per gram body weight per hour as hairless-obese mice at about 24°C, the weight averages appear to be closely inversely related to the oxygen consumption averages. The presence or absence of pelage seems to make a negligible contribution to oxygen consumption in these two types of obese …

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Systematics Of Isocarpha (Compositae: Eupatorieae), David J. Keil, Tod F. Stuessy Jul 1981

Systematics Of Isocarpha (Compositae: Eupatorieae), David J. Keil, Tod F. Stuessy

Biological Sciences

Isocarpha comprises five species ranging from southern Texas and the Bahamas to northern Peru and northeastern Brazil. The genus belongs in Eupatorieae rather than Heliantheae, but structure of the head of Isocarpha with its elongate, chaffy receptacle is anomalous within Eupatorieae. An hypothesis is presented suggesting the evolutionary derivation of this type of head through formation of floral buds in the axils of the involucral bracts. Generic ties of Isocarpha within Eupatorieae are unclear, but the closest affinities appear to be with Ayapana and relatives.

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A New Marlin, Makaira Panamensis, From The Late Miocene Of Panama, Harry L. Fierstine Jan 1978

A New Marlin, Makaira Panamensis, From The Late Miocene Of Panama, Harry L. Fierstine

Biological Sciences

Makaira panamensis new sp. is described from a single neurocranium found in the Chagres Sandstone (Late Miocene) of the Atlantic coast of Panama. The new species is closely related to and possibly ancestral to the extant M. indica (black marlin) and M. nigricans (blue marlin). It differs from both by possessing a triangular rather than elongate basioccipital foramen, large nutrient canals in the rostrum and probably a more elongate orbit. The fossil is compared to all known fossil Istiophorids as well as to the living marlins. It is suggested that the black marlin is a more recent derivative (than the …

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A Revision Of Pectis Section Pectothrix (Compositae: Tageteae), David J. Keil Jan 1978

A Revision Of Pectis Section Pectothrix (Compositae: Tageteae), David J. Keil

Biological Sciences

Pectis L. sect. Pectothrix A. Gray (Compositae: Tageteae) comprises a group of showy, yellow-headed species which occurs mainly in the arid and semi-arid portions of the southwestern United States and northern Mexico. Although several regional floras have included one or more of the species in this group, no workers since Fernald (1897) and Rydberg (1916) have attempted to treat this portion of genus in its entirety. Since 1916, several workers have described new taxa (Cory, 1927; Johnston, 1940; Wiggins, 1951; Keil, 1974), and many new collections have been made. Recent studies (Keil, 1974) have suggested that the species relationships proposed …

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Chromosome Counts Of Compositae From The United States And Mexico, Donald J. Pinkava, David J. Keil Jul 1977

Chromosome Counts Of Compositae From The United States And Mexico, Donald J. Pinkava, David J. Keil

Biological Sciences

Chromosome counts are reported for 126 taxa representing 122 species and 61 genera of Compositae. First reports include two genera, Stylocline (n = 14) and Chromolepis (n = 19), 17 species, two infraspecific taxa, and one interspecific hybrid. Five additional taxa have chromosome numbers differing from previously published accounts. Carminatia is reinstated to generic status.

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Chromosome Counts Of Compositae From Mexico And The United States, David J. Keil Jul 1977

Chromosome Counts Of Compositae From Mexico And The United States, David J. Keil

Biological Sciences

Chromosome counts of Compositae are reported from Mexico and the United States. First generic counts are from Egletes (n = 27), Hydropectis (n = 9), and Pippenalia (2n = ca. 60). First counts also are reported for 22 specific and infraspecific taxa in Baccharis, Erigeron, Flaveria, GnaphaUum, Grindelia, Helenium, Heterotheca, Melampodium, Montanoa, Perymenium, Piqueria, Senecio, Stevia, Verbesina, Xanthocephalum, and Zaluzania. Additional counts also are provided for 123 populations of taxa counted previouslY, of which eight are new numbers. Taxonomic implications of certain counts are discussed.

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Revision Of Pectis Section Pectidium (Compositae: Tageteae), David J. Keil Jan 1977

Revision Of Pectis Section Pectidium (Compositae: Tageteae), David J. Keil

Biological Sciences

Pectis L. sect. Pectidium (Less.) A. Gray is a small but very wide-ranging group of taxa. The geographic range of this section includes both insular distribution patterns and broad disjunctions. In an effort to clarify the systematic relationships and to provide a possible explanation for the interesting distribution patterns, I undertook an investigation of this section.

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Clematis Coahuilensis (Ranunculaceae), A New Species From North-Central Mexico, David J. Keil Jan 1977

Clematis Coahuilensis (Ranunculaceae), A New Species From North-Central Mexico, David J. Keil

Biological Sciences

Floristic investigations in the Cuatro Cienegas basin and nearby mountain ranges in Coahuila, Mexico, have resulted in the discovery of a previously undescribed species of Clematis (Ranunculaceae). The new species, Clematis coahuilensis, is apparently restricted to the Chihuahuan Desert Region and adjacent segments of the Sierra Madre Oriental. Its known distribution is centered in Coahuila.

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Chromosome Studies In North And Central American Species Of Pectis L. (Compositae: Tagetaea), David J. Keil Jan 1977

Chromosome Studies In North And Central American Species Of Pectis L. (Compositae: Tagetaea), David J. Keil

Biological Sciences

Chromosomal modification is often a major factor in the evolutionary diversification of a large, rapidly evolving genus. Pectis, the largest and most widespread genus in the New World tribe Tageteae (Compositae), has radiated into a variety of habitats during its evolutionary history. Until relatively recently, however, little has been known of the role of chromosomal change in the evolution of the genus. Pectis was cytologically unknown until the studies of Raven and Kyhos (1961) and of Turner, Ellison, and King (1961). Subsequently, additional counts have been reported for several taxa (Table 1). To date, however, only a few of …

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Pectis Humifusa New To The Flora Of The United States, David J. Keil Jan 1975

Pectis Humifusa New To The Flora Of The United States, David J. Keil

Biological Sciences

No abstract provided.

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Chromosome Counts Of Compositae From The United States, Mexico, And Guatemala, David J. Keil, Tod F. Stuessy Jan 1975

Chromosome Counts Of Compositae From The United States, Mexico, And Guatemala, David J. Keil, Tod F. Stuessy

Biological Sciences

Chromosome numbers can be extremely useful in systematic studies, particularly for helping to reveal evolutionary relationships. For the past fifteen year numerous chromosome reports from plants have been published, especially in the Compositae, and these counts have been compiled in several major sources (Darlington & Wylie, 1955; Cave, 1958-65; Ornduff, 1967-69; Fedorov, 1969; Moore, 1970-72). However, a rapid glance through these references indicates not only that many species never have been counted, but also that many taxa are known only from a single plant in one population. In view of the common occurrence of euploid and aneuploid races in plants …

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Anatomical Specimens From Preserved Animal Discards, Harry L. Fierstine, Myron A. Amerine, Kathleen L. Bek Nov 1974

Anatomical Specimens From Preserved Animal Discards, Harry L. Fierstine, Myron A. Amerine, Kathleen L. Bek

Biological Sciences

No abstract provided.

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Xiphiorhynchus Kimblalocki, A New Billfish From The Eocene Of Mississippi With Remarks On The Systematics Of Xiphioid Fishes, Harry L. Fierstine, Shelton P. Applegate Apr 1974

Xiphiorhynchus Kimblalocki, A New Billfish From The Eocene Of Mississippi With Remarks On The Systematics Of Xiphioid Fishes, Harry L. Fierstine, Shelton P. Applegate

Biological Sciences

Xiphiorhynchus kimblalocki, a new species of extinct billfish from the Eocene of Mississippi, is described. This is the first record of Xiphiorhynchus outside of western Europe, and the material consists of a well-preserved rostrum, three partial vertebrae and two fin spine fragments. Xiphiorhynchus kimblalocki is compared with other living and extinct billfish and appears to be intermediate in morphology between the Xiphiidae and Istiophoridae. Various genera of fossil billfish are critically discussed and we suggest that the Blochiidae, Paleorhynchidae, and the "Cylindracanthus-group" should be placed in Xiphioidei lncertae sedis until better evidence indicates that they are billfish. …

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New Taxa In Pectis (Compositae: Pectidinae) From Mexico And The Southwestern United States, David J. Keil Jan 1974

New Taxa In Pectis (Compositae: Pectidinae) From Mexico And The Southwestern United States, David J. Keil

Biological Sciences

This paper is the first of a series of investigations on the systematics of Pectis L., the largest genus in the subtribe Pectidinae of the tribe Helenieae. Pectis consists of about one hundred species of annual or perennial, glandular-dotted, yellow-rayed herbs that are widespread in the warmer parts of the New World. In the present report three previously unrecognized taxa from Mexico and the southwestern United States are described as new, and a new combination also is made

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Fishes Collected In Morro Bay, California Between January, 1968 And December, 1970, Harry L. Fierstine, Kurt F. Kline, Gregory R. Garman Jan 1973

Fishes Collected In Morro Bay, California Between January, 1968 And December, 1970, Harry L. Fierstine, Kurt F. Kline, Gregory R. Garman

Biological Sciences

Sixty-six species of fish were collected in Morro Bay between January, 1968 and December, 1970. The bay was divided into five ecological zones. Zone I was characterized by sandy beaches with little algae and contained 10 species. Zone II contained 35 species and was characterized by a sandy-silt bottom with some Zostera and kelp beds scattered among commercial piers. Zone III contained 31 species and was characterized by more Zostera beds and fewer commercial developments than Zone II. Zone IV contained 30 species and was characterized by large expanses of shallow Zostera beds dissected by very narrow channels. Zone V …

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The Paleontology Of Billfish - The State Of The Art, Harry L. Fierstine Aug 1972

The Paleontology Of Billfish - The State Of The Art, Harry L. Fierstine

Biological Sciences

The major osteological features are described for living billfishes. All billfish remains are reviewed critically and some questionable forms are placed in Xiphioidei Incertae Sedis (uncertain status). The remaining xiphioids are placed into three families: Istiophoridae, Xiphiidae, and Xiphiorhynchidae. A new undescribed xiphiid from Mississippi shows that the billfish lineages must have diverged prior to the Eocene. Areas of research are suggested that will help place the paleontological studies on a more secure foundation.

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A Serological Estimate Of Monzygotic Twinning In Sheep, William D. Stansfield May 1968

A Serological Estimate Of Monzygotic Twinning In Sheep, William D. Stansfield

Biological Sciences

No abstract provided.

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Studies In Locomotion And Anatomy Of Scombroid Fishes, Harry L. Fierstine, Vladimir Walters Jan 1968

Studies In Locomotion And Anatomy Of Scombroid Fishes, Harry L. Fierstine, Vladimir Walters

Biological Sciences

Acceleration rates, analyses of body movements, and pertinent anatomical features are given for various members of the Scombridae, Istiophoridae, and Xiphiidae and are discussed in light of the modern work on smaller freshwater teleosts and marine cetaceans.

Acceleration values up to 43.1 m/sec2 are given for Thunnus albacares and Acanthocybium solanderi. Nearly 100% of the propulsive thrust comes from the caudal fin. There are two main intervertebral joints which are concerned with locomotion, a pre-peduncular and a post-peduncular joint with the body and peduncle held almost stiff, a condition similar to that described for marine cetaceans. The caudal …

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Billfish Remains From Southern California With Remarks On The Importance Of The Predentary Bone, Harry L. Fierstine, Shelton P. Applegate Jan 1968

Billfish Remains From Southern California With Remarks On The Importance Of The Predentary Bone, Harry L. Fierstine, Shelton P. Applegate

Biological Sciences

No abstract provided.

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Measurements Of Swimming Speeds Of Yellowfin Tuna And Wahoo, Vladimir Walters, Harry L. Fierstine Apr 1964

Measurements Of Swimming Speeds Of Yellowfin Tuna And Wahoo, Vladimir Walters, Harry L. Fierstine

Biological Sciences

No abstract provided.

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Another Pacific Record Of The Black Swift Off Mexico, O. Marcus Buchanan, Harry L. Fierstine Apr 1964

Another Pacific Record Of The Black Swift Off Mexico, O. Marcus Buchanan, Harry L. Fierstine

Biological Sciences

No abstract provided.

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A New Northern Record Of The Smooth Stargazer, Harry L. Fierstine, Robert G. Werner Jan 1963

A New Northern Record Of The Smooth Stargazer, Harry L. Fierstine, Robert G. Werner

Biological Sciences

No abstract provided.

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