Life Sciences Commons^™

Pmr6, A Pectate Lyase–Like Gene Required For Powdery Mildew Susceptibility In Arabidopsis, John P. Vogel, Ted K. Raab, Celine Schiff, Shauna C. Somerville

Ted K. Raab

The plant genes required for the growth and reproduction of plant pathogens are largely unknown. In an effort to identify these genes, we isolated Arabidopsis mutants that do not support the normal growth of the powdery mildew pathogen Erysiphe cichoracearum. Here, we report on the cloning and characterization of one of these genes, PMR6. PMR6 encodes a pectate lyase-like protein with a novel C-terminal domain. Consistent with its predicted gene function, mutations in PMR6 alter the composition of the plant cell wall, as shown by Fourier transform infrared spectroscopy. pmr6-mediated resistance requires neither salicylic acid nor the ability to perceive …

Captive Double-Crested Cormorant Phalacrocorax Auritus Predation On Channel Catfish Ictalurus Punctatus Fingerlings And Its Influence On Single-Batch Cropping Production, Brian S. Dorr

Brian S Dorr

Abstract.-We studied the effect of captive double-crested cormorant Phalacrocorax auritus predation on channel catfish Ictalurus punctatus inventories from research ponds with and without alternative prey during the years 1998-2000. In 1998, predation by two groups of captive cormorants on ponds without alternative prey produced inventory reductions relative to a control pond that were equivalent to 10.2 (516 g) and I 0.5 (608 g) catfish/bird per d. In 1999 and 2000 individual cormorants foraging on 0.02-ha pond halves for I 0 d (500 cormorant d/ha) stocked with both catfish and golden shiners Notemigonus crysoleucas produced inventory reductions at harvest (7.5 mo …

Costs Of Reproduction In The Terrestrial Isopod Porcellio Laevis Latreille (Isopoda: Oniscidea): Brood-Bearing And Locomotion, Scott Kight

Scott Kight

Individual Variation In The Duration Of Territory Occupation By Males Of The Dragonfly Perithemis Tenera (Odonata: Libellulidae), Paul V. Switzer

Paul V. Switzer

In the dragonfly Perithemis tenera Say, males defend territories around oviposition sites and defense of a site is critical for reproductive success. This study first demonstrated that individual males varied consistently in how long they defended a particular territory within a day (their “tenure”) and in the quality of the sites they defended. I then investigated a number of factors that may have affected territory tenure and may have led to the observed variation among males. Territory occupations that ended “voluntarily” were significantly longer than those that ended because the male was evicted from his territory. For voluntary desertions, tenure …

Self Reliant Agriculture For Arid Lands, David A. Bainbridge

David A Bainbridge

More than a billion people face the challenge of supporting themselves in the world's arid lands. Much can be improved by refining and adopting the best traditional practices and crops from around the world. The lessons learned can also help develop new and improved agronomic practices and crops.

Influence Of An Extreme High Water Event On Survival, Reproduction, And Distribution Of Snail Kites In Florida, Usa, Robert Bennetts, Wiley Kitchens, Victoria Dreitz

Victoria Dreitz

No abstract provided.

Evaluation Of Antemortem Sampling To Estimate Chronic Wasting Disease Prevalence In Free-Ranging Mule Deer, Lisa Wolfe, Mary Conner, T Baker, Victoria Dreitz, Kenneth Burnham, Elizabeth Williams, N T. Hobbs, Michael Miller

Victoria Dreitz

No abstract provided.

Foraging Ecology And Depredation Management Of Great Blue Herons At Mississippi Catfish Farms, James F. Glahn, Brian S. Dorr, John B. Harrell, Lester Khoo

Brian S Dorr

No abstract provided.

A Role For Natural Resource Social Science In Biodiversity Risk Assessment, Philip J. Nyhus, Frances R. Westley, Robert C. Lacey, Philip S. Miller

Philip J. Nyhus

Biologists have made considerable progress in developing realistic simulation models to predict extinction risks for threatened species. Social scientists have to date had a more limited role in these efforts. This limited involvement comes despite the growing acknowledgment by population biologists and simulation modelers that this additional input is necessary for these models to accurately reflect the impact of humans and human-dominated landscapes on wildlife populations. We argue that collaborations among social and biological scientists can provide unparalleled opportunities to develop new conceptual and simulation tools for biodiversity risk assessment. One challenge is that while the value of interdisciplinary research …

Life History Trade-Offs And Phenotypic Plasticity In The Reproduction Of Galápagos Lava Lizards (Microlophus Delanonis), Mark Jordan, Howard Snell

Mark A. Jordan

No abstract provided.

The First Gran Chaco Expedition Of The Museum Für Tierkunde Dresden: Records Of Amphibians, Reptiles And Mammals From The Dry Chaco Of Paraguay., Edgar Lehr, Thomas Ziegler, Jakob Unger, Alfred Feiler

Edgar Lehr

During a first expedition of the Museum fur Tierkunde Dresden to the Dry Chaco of Paraguay a total of 22 amphibian, 46 reptile and 41 mammal species were recorded, of which an annotated list is presented. Of these, six amphibian, four reptile, and five mammal species are exclusively representatives of the Gran Chaco region. In total, 24 taxa of the recorded species are listed in current CITES Appendices I and II. Beside the distributional records given for each species, the microteiid lizard Gymnophthalmus rubricauda could be recorded for Paraguay for the first time (ZIEGLER et al. 2002a). In addition, the …

A New Species Of Phrynopus (Amphibia, Anura, Leptodactylidae) From The Cordillera De Carpish (Departamento De Huánuco, Peru), Edgar Lehr, Daniel Rodriguez, Jesus Cordova

Edgar Lehr

A new medium-sized species of leptodactylid frog, genus Phrynopus is described from the eastern Andean slopes of central Peru (Departamento de Huanuco, Cordillera de Carpish, 2960m above sea level). The new species differs from all described species of the genus by having long and slim extremities, dorsum and ventrum dark grey, throat with a large yellowish mustard blotch, each side of midventer with a large yellowish mustard rectangular blotch, and toes and fingers partly creamy yellow. The new species is documented by a single female specimen which did not show saltatory locomotion. In the Cordillera de Carpish, the new species …

The Herpetofauna Of Central Peru Along A Transect From The Pacific Coast To The High Andes (Amphibia Et Reptilia), Edgar Lehr, Gunther Kohler, Bruno Street

Edgar Lehr

The transect runs along the 10th Latitude of Peru with an extension of 110 airline km (west-east) and 50 airline km (north-south), respectively the Latitude being the middle of the transect. From west to east the transect passes through the coastal desert, the mountain steppe, and the puna. During approximately four months of fieldwork 18 localities in the Departamento Ancash were visited within the transect. 29 species (amphibians: 8, reptiles: 21) were recorded, belonging to 10 families (amphibians: 4, reptiles: 6) and 19 genera (amphibians: 6, reptiles: 13). Two species of reptiles were new to science and another two species …

Isolation And Characterization Of Microsatellite Loci From Galápagos Lava Lizards (Microlophus Spp.), Mark Jordan, Robert Hammond, Howard Snell, Heidi Snell, William Jordan

Mark A. Jordan

No abstract provided.

The Snake Fauna Of Pozuzo (Peru) (Reptilia: Serpentes), Edgar Lehr, Julia Lara

Edgar Lehr

The snake fanna of Pozuzo (Peru) (Reptilia: Serpentes). - Snakes occurring in Pozuzo (823 m above sea level, Departamento Pasco, Peru) are mentioned, including material of the herpetological collection of the health station of Pozuzo being collected between 1993 and 1997, and material obtained by own fieldwork. The snake fauna of Pozuzo comprehends 23 species. Intensive agriculture and cattle breeding threatens the snake fauna.

Two Sympatric New Species Of Phrynopus (Anura: Leptodactylidae) From A Cloud Forest In The Peruvian Andes, Edgar Lehr, Cesar Aguilar, Gunther Kohler

Edgar Lehr

Two new sympatric species of Phrynopus are described from cloud forest (3020-3380m ) of the eastern slopes of the Andes in central Peru (Departamento Huanuco). Both new species appear to be members of the Phrynopus peruanus group.

Morphological And Ecological Remarks On Phrynopus Kauneorum (Amphibia, Anura, Leptodactylidae), Edgar Lehr, Cesar Aguilar, Jesus Cordova

Edgar Lehr

Phrynopus kauneorum was described as a medium-sized species with snout-vent length up to 32.3mm in females. Further adult female specimens of P. kauneorum, collected near the type locality (palma Pampa, Provincia Pachitea, Departamento Huanuco, Peru) show that it is a large species with a snout-vent length up to 56.4mm and the largest known species of the genus. P. kauneorum has an altitudinal distribution of 2 735-3 380m and is known from two localities in the yungas ecoregion of the eastern Andes of Peru. One adult female contained 56 eggs with an average diameter of 3.31±0.35mm (n=10). Osteological data of the …

Fish Production Of A Temperate Artificial Reef Based On The Density Of Embiotocids (Teleostei: Perciformes), Daniel J. Pondella Ii, John S. Stephens Jr., Matthew T. Craig

Daniel Pondella

The abundance of two embiotocids (Embiotoca jacksoni and Rhacochilus vacca) was surveyed continually from 1974 to 1998 on the breakwaters comprising King Harbor in Redondo Beach, California, and a nearby natural rocky-reef as a reference. Embiotocids provide an interesting model for reef-fish production because they are viviparous and their entire ontogeny can be observed on the reefs. We deduce that the two reef populations of both species were stable at their carrying capacity. This carrying capacity was greater in King Harbor throughout the study. We also report a linear decline in survival of juveniles of both species over the 25-year …

New Species Of Tricolor Leptotyphlops (Reptilia: Squamata: Leptotyphlopidae) From Central Peru, Edgar Lehr, Van Wallach, Gunther Kohler, Cesar Aguilar

Edgar Lehr

A new species of slender blind snake, Leptotyphlops alfredschmidti, is described from two localities (2940 and 3090 m) from the western Andean slopes of central Pern (Departamento de Ancash, Provincia de Huarmey). Leptotyphlops alfredschmidti is referred to the Leptotyphlops tesselatus group. The new species shares with Leptotyphlops teaguei and Leptotyphlops tricolor a tricolor body pattern of red, black, and yellowish longitudinal stripes but differs from all members of the group in several features of coloration pattern and pholidosis.

What Are Bacterial Species?, Frederick M. Cohan

Frederick M. Cohan

No abstract provided.

Water-Based Recreational Benefits Of Conservation Programs: The Case Of Conservation Tillage On U.S. Cropland, Kathy Baylis, Peter Feather, Merritt Padgitt, Carmen Sandretto

Kathy Baylis

No abstract provided.

The Use Of Resighting Data To Estimate The Rate Of Population Growth Of The Snail Kite In Florida, Victoria Dreitz, James Nichols, James Hines, Robert Bennetts, Wiley Kitchens, Donald Deangelis

Victoria Dreitz

No abstract provided.

Larval Productivity Of A Mature Artificial Reef: The Ichthyoplankton Of King Harbor, California, 1974–1997, John Stephens Jr, Daniel Pondella Ii

Daniel Pondella

Do artificial reefs serve as productive marine fish habitats (sources) or do fish assemblages of such reefs contribute little to the gene pool of succeeding generations (sinks)? Using data from a 24-year study of the breakwater at King Harbor (California, USA), annual densities of reef fish larvae were compared with densities observed elsewhere in the Southern California Bight. Larval production at King Harbor has decreased over the study period, as has the size of the fish assemblage. Both declines may be related to recorded increases in water temperature. Larval densities from similar water depths (0–15 m) throughout the bight vary …