Life Sciences Commons^™

Evaluation Of A Methyl Anthranilate-Based Bird Repellent: Toxicity To Channel Catfish Ictalurus Punctatus And Effect On Great Blue Heron Ardea Herodias Feeding Behavior, Brian S. Dorr, Larry Clark, Igor Mezine

Brian S Dorr

No abstract provided.

Rejection Of Cowbird Eggs By Mourning Doves: A Manifestation Of Nest Usurpation? Brian D. Peer And Eric K. Bollinger, Eric K. Bollinger, Brian D. Peer

Eric K. Bollinger

This article was printed in The Auk, Volume 115, No.4 (1998).

Comparative Kinematics And Hydrodynamics Of Odontocete Cetaceans: Morphological And Ecological Correlates With Swimming Performance, Frank E. Fish

Frank E. Fish

Propulsive morphology and swimming performance were compared for the odontocete cetaceans Delphi,Delphinapterus leucas, Orcinus orca, Pseudorca crassidens and Tursiops truncatus. Morphological differences were apparent among the whales. The general body contour and low-aspect-ratio caudal flukes of D. leucas indicated that this species was a low-performance swimmer compared with the other species. Propulsive motions were video-taped as animals swam steadily in large pools. Video tapes were analyzed digitally using a computerized motion-analysis system. Animals swam at relative velocities ranging from 0.4 to 2.4 body lengths s(-1). The stroke amplitude of the flukes decreased linearly with velocity for D. leucas, but amplitude …

Degradation Signal Masking By Heterodimerization Of Mata2 And Mata1 Blocks Their Mutual Destruction By The Ubiquitin-Proteasome Pathway, Rob Swanson, Phoebe R. Johnson, Larissa Rakhilina, Mark Hochstrasser

Rob Swanson

Proteolysis by the ubiquitin-proteasome pathway is often regulated, but the mechanisms underlying such regulation remain ill-defined. In Saccharomyces cere-visiae, cell type is controlled by the MAT transcription factors. The a2repressor is a known ubiquitinpathway substrate in a haploid cells. We show that a1 is rapidly degraded in a haploids. In a/a diploids, a2 and a1 are stabilized by heterodimerization. Association depends on N-terminal coiled-coil interactions between a1 and a2. Residues in a2 important for these interactions overlap a critical determinant of an a2 degradation signal, which we delimit by extensive mutagenesis. Our data provide a detailed description of a natural …

Effects Of Distance To Juniperus Virginiana On The Establishment Of Fraxinus And Acer Seedlings In Old Fields, Scott J. Meiners, David L. Gorchov

Scott J. Meiners

It has been hypothesized that Juniperus virginiana facilitates tree seedling establishment in secondary succession. To test this hypothesis, we sampled four old fields in southwestern Ohio and monitored experimentally planted seeds and seedlings of Acer saccharum and Fraxinus americana for two years. Seeds and seedlings were placed into herbivore exclosures placed 0.3 and 3.0 m from J virginiana trees in an old field in Ohio. We found a significant positive spatial association between juniperus virginiana and tree seedling densities in all four old fields. Soil temperature, soil moisture, evaporative demand and light level in the 0.3 m treatment were significantly …

Untangling Confusion Between Eubranchipus Vernalis And Eubranchipus Neglectus (Branchiopoda : Anostraca), Denton Belk, Graziella Mura, Stephen C. Weeks

Stephen C. Weeks

Despite illustrations in Garman (1926) clearly showing the different antennal appendages of Eubranchipus vernalis and Eubranchipus neglectus, Creaser (1930) published erroneous drawings of the antennal appendages of these two species that led to more than 65 years of taxonomic confusion between them. We untangle this confusion, and show that these species have nonoverlapping areas of occurrence with E. vernalis to the east and E. neglectus to the west of the Appalachian Mountains. In addition, we present evidence supporting the use of resting-egg (cyst) morphology in studying evolutionary relationships among anostracan species. An important part of this usefulness is due to …

Genetic Variation Among Populations Of River Otters In North America: Considerations For Reintroducing Projects, Thomas L. Serfass, Robert P. Brooks, James M. Novak, Paul E. Johns, Olin E. Rhodes Jr.

James M. Novak

Horizontal starch gel electrophoresis was used to assess variability at 23 presumptive gene loci of 732 river otters obtained from fur-trappers in 18 states and three Canadian provinces. States and provinces providing otters were sorted into eight geographic regions for genetic comparisons. Multilocus heterozygosity and polymorphism ranged from 0.018 to 0.032 and 0.044 to 0.087, respectively. One locus, esterase-2, (EST-2) demonstrated a high level of polymorphism throughout all regions. Malate dehydrogenase-1 (MDH-1) was polymorphic throughout the Mississippi drainage but not elsewhere. Heterozygosity, occurrence of rare alleles, and mean number of alleles per locus were associated positively with estimated population sizes. …

Reproductive Demographics And Early Life History Of The Shovelnose Sturgeon (Scaphirhynchus Platorynchus), Robert E. Colombo

Robert E. Colombo

Due to the collapse of the historic caviar fisheries in the Volga River and Caspian Sea, the demand on domestically produced caviar has increased. To supply the increased demand, the harvest of the shovelnose sturgeon Scaphirhynchus latorynchus has increased. Because caviar fisheries preferentially harvest females, information regardingthe sexual demographics of these populations is essential for effective fisheries management. To date, knowledge regarding the sex ratios and reproductive development of the shovelnose sturgeon population in the Middle Mississippi River is lacking. In Chapter 1, I describe this problem in detail and in subsequent chapters I explain how I addressed this problem …

Cyperus Fuscus (Cyperaceae), New To Missouri And Nevada, With Comments On Its Occurrence In North America, Paul M. Mckenzie, Brad Jacobs, Charles T. Bryson, Gordon C. Tucker, Richard Carter

Gordon C. Tucker

No abstract provided.

Evaluation Of Molar Size As A Basis For Distinguishing Wild Boar From Domestic Swine: Employing The Present To Decipher The Past, John J. Mayer, James M. Novak, I. Lehr Brisbin Jr.

James M. Novak

No abstract provided.

Foraminiferal Biofacies On A North Coast Fringing Reef (1-75m), Discovery Bay, Jamaica, R. E. Martin, W. D. Liddell

W. David Liddell

No abstract provided.

Analysis Of Cell Division And Elongation Underlying The Developmental Acceleration Of Root Growth In Arabidopsis Thaliana, Tobias Baskin, G.T.S. Beemster

Tobias Baskin

To investigate the relation between cell division and expansion in the regulation of organ growth rate, we used Arabidopsis thaliana primary roots grown vertically at 20°C with an elongation rate that increased steadily during the first 14 d after germination. We measured spatial profiles of longitudinal velocity and cell length and calculated parameters of cell expansion and division, including rates of local cell production (cells mm−1 h−1) and cell division (cells cell−1 h−1). Data were obtained for the root cortex and also for the two types of epidermal cell, trichoblasts and atrichoblasts. Accelerating root elongation was caused by an increasingly …

A Response To P.A. Memno's "Nature, Society, And State: An Antiopodean Perspective", Daniel J. Hornbach

Daniel J. Hornbach

No abstract provided.

Host-Plant Associations And Specificity Among Cynipid Gall-Inducing Wasps Of Eastern Usa, Warren Abrahamson, G. Melika, R, Scrafford, G. Csoka

Warren G. Abrahamson, II

No abstract provided.

Root Growth, Developmental Changes In The Apex, And Hydraulic Conductivity For Opuntia Ficus-Indica During Drought, J. Dubrovsky, Gretchen North, P. Nobel

Gretchen North

Developmental changes in the root apex and accompanying changes in lateral root growth and root hydraulic conductivity were examined for Opuntia ficus-indica (L.) Miller during rapid drying, as occurs for roots near the soil surface, and more gradual drying, as occurs in deeper soil layers. During 7 d of rapid drying (in containers with a 3-cm depth of vermiculite), the rate of root growth decreased sharply and most root apices died; such a determinate pattern of root growth was not due to meristem exhaustion but rather to meristem mortality after 3 d of drying. The length of the meristem, the …

Water Uptake And Structural Plasticity Along Roots Of A Desert Succulent During Prolonged Drought, Gretchen North, P. Nobel

Gretchen North

No abstract provided.

Gall-Inducing Insects Provide Insights Into Plant Systematic Relationships, Warren Abrahamson, G. Melika, R. Scrafford, G. Csoka

Warren G. Abrahamson, II

No abstract provided.

Just Lookin' For A Home, Warren G. Abrahamson Ii, A. E. Weis

Warren G. Abrahamson, II

No abstract provided.

Precocene Ii Modifies Maternal Responsiveness In The Burrower Bug, Sehirus Cinctus (Heteroptera)., Scott Kight

Scott Kight

Revised Group Classification Of The Genus Spiroplasma, David L. Williamson, Robert F. Whitcomb, Joseph G. Tully, Gail E. Gasparich, David L. Rose, Patricia Carle, Joseph M. Bové, Kevin J. Hackett, Jean R. Adams, Roberta B. Henegar, Meghnad Konai, Claude Chastel, Frank E. French

Gail Gasparich

Serologic And Genomic Relatedness Of Group Xiv Spiroplasma Isolates From A Lampyrid Beetle And Tabanid Flies: An Ecologic Paradox, G. E. Gasparich, K. J. Hackett, F. E. French, R. F. Whitcomb

Gail Gasparich