Open Access. Powered by Scholars. Published by Universities.®

Digital Commons Network™

Open Access. Powered by Scholars. Published by Universities.®

Biology

Institution
Keyword
Publication Year
Publication
Publication Type
File Type

Articles 18271 - 18300 of 20612

Full-Text Articles in Entire DC Network

Differential Expression Of The Putative Multidrug Resistance (Mdr) P-Glycoprotein In Marine Hepatocytes, Marty C. Braud Jan 1998

Differential Expression Of The Putative Multidrug Resistance (Mdr) P-Glycoprotein In Marine Hepatocytes, Marty C. Braud

Dissertations and Theses @ UNI

Aquatic organisms such as fish, sponges and mussels are exposed to mixtures of chemicals in polluted waters including polycyclic aromatic hydrocarbons, pesticides and heavy metals. The tissues of some of these organisms are found to have a lower concentration of pollutants compared to the surrounding waters and/ or sediments. This suggests that some aquatic organisms may possess a means of detoxifying environmental pollutants. For this study, primary hepatocytes of the marine winter flounder (Pleuronectes americanus) and freshwater rainbow trout (Salmo gairdnen) hepatomas were exposed to environmental pollutants to determine whether a multidrug-resistance (MDR) p-glycoprotein (pgp) extrusion pump is involved in …

Go to article

Comparison Of Litter Decomposition Rates And Soil Arthropod Abundance In Different Stages Of Prairie Reconstruction, Lisa M. Busch Jan 1998

Comparison Of Litter Decomposition Rates And Soil Arthropod Abundance In Different Stages Of Prairie Reconstruction, Lisa M. Busch

Dissertations and Theses @ UNI

The abundance of soil microarthropods and of corresponding decomposition rates in native prairie remnants and reconstructed prairies at Walnut Creek National Wildlife Refuge were investigated. Soil microarthropods were collected with litter bags and extracted using modified Berlese-Tullgren funnels for the months of June through October of 1997. Litter decomposition rates were found to be lowest in reconstructed prairies and highest in native prairie remnants. Microarthropod abundance, however, appeared to be inversely correlated with decomposition rates. It appears that native prairie remnants are more productive than reconstructed prairies due to higher decomposition rates. However, the prairies that have been reconstructed for …

Go to article

Breeding Bird Use Of Intensively Managed Rotational Grazing Pastures, Native Prairies And Savannas: A Comparison, Jennifer Marie Hurley O'Hara Jan 1998

Breeding Bird Use Of Intensively Managed Rotational Grazing Pastures, Native Prairies And Savannas: A Comparison, Jennifer Marie Hurley O'Hara

Dissertations and Theses @ UNI

Intensively managed rotational grazing is a grazing method in which livestock are moved through a series of paddocks over a three to six week rotation. Vegetation in resting paddocks is allowed to regrow, renew energy reserves, and rebuild plant vigor to provide nutritious forage for livestock. Consequently, vegetation in the paddocks is in different stages of growth which creates a mosaic of vegetation heights across the pasture landscape. I hypothesized that the mosaic of vegetation heights resembles the native tallgrass prairie grazed by bison prior to European settlement. The mosaic may be attractive and beneficial to breeding grassland birds. Several …

Go to article

Crystal Structure Of The Adenylyl Cyclase Activator G(Sα), Roger K. Sunahara, John J.G. Tesmer, Alfred G. Gilman, Stephen R. Sprang Dec 1997

Crystal Structure Of The Adenylyl Cyclase Activator G(Sα), Roger K. Sunahara, John J.G. Tesmer, Alfred G. Gilman, Stephen R. Sprang

Biological Sciences Faculty Publications

The crystal structure of G(sα), the heterotrimeric G protein α subunit that stimulates adenylyl cyclase, was determined at 2.5 Å in a complex with guanosine 5'-O-(3-thio-triphosphate) (GTPγS). G(sα) is the prototypic member of a of GTP-binding proteins that regulate the activities of effectors in a hormone-dependent manner. Comparison of the structure of G(sα)·GTPγS with that of G(iα)·GTPγS suggest that their effector specificity is primarily dictated by the shape of the binding surface formed by the switch II helix and the α3-β5 loop, despite the high sequence homology of these elements. In contrast, sequence divergence explains the inability of regulators of …

Go to article

Review Of Sexual Selection: Mate Choice And Courtship In Nature By James L. Gould And Carol Grant Gould, Marlene Zuk, Gita R. Kolluru, Kurt A. Mckean Dec 1997

Review Of Sexual Selection: Mate Choice And Courtship In Nature By James L. Gould And Carol Grant Gould, Marlene Zuk, Gita R. Kolluru, Kurt A. Mckean

Biological Sciences

No abstract provided.

Go to article

Draft: Plan For The Management Of The Houtman Abrolhos Islands Fish Habitat Protection Area (Schedule 1), Abrolhos Islands Management Advisory Council, Fisheries Department Of Western Australia Dec 1997

Draft: Plan For The Management Of The Houtman Abrolhos Islands Fish Habitat Protection Area (Schedule 1), Abrolhos Islands Management Advisory Council, Fisheries Department Of Western Australia

Fisheries Management Papers

This document is a separate draft plan which has been prepared to meet the requirements of Section 117 of the Fish Resources Management Act 1994. It contains a description of the area; outlines the purposes for which the area is to be set aside; and lists the recommendations contained in Fisheries Management Paper No. 104, Management of the Houtman Abrolhos System, which relate to the management of the proposed Fish Habitat Protection Area.

Go to article

Management Of The Houtman Abrolhos System, Abrolhos Islands Management Advisory Council, Fisheries Department Of Western Australia Dec 1997

Management Of The Houtman Abrolhos System, Abrolhos Islands Management Advisory Council, Fisheries Department Of Western Australia

Fisheries Management Papers

In November 1995 Cabinet resolved that the Minister for Fisheries would establish the Abrolhos Islands Management Advisory Committee (AIMAC) pursuant to Section 42 of the Fish Resources Management Act 1994. The role of AIMAC is to advise the Minister for Fisheries about the management of the Abrolhos Islands and the adjoining State Territorial Waters, as detailed in Section 2.2.3.1 of this report. The AIMAC has overseen the preparation of this report on behalf of the Minister for Fisheries. This draft report contains a brief description of the Abrolhos System and its special values. It also states goals and objectives for …

Go to article

The Mayfly Newsletter, Peter M. Grant Dec 1997

The Mayfly Newsletter, Peter M. Grant

The Mayfly Newsletter

The Mayfly Newsletter is the official newsletter of the Permanent Committee of the International Conferences on Ephemeroptera.

Go to article

Effect Of Insulin And Vanadate On Sre-Mediated C-Fos Expression And Jnk Activation, Francisco J. Berguido Dec 1997

Effect Of Insulin And Vanadate On Sre-Mediated C-Fos Expression And Jnk Activation, Francisco J. Berguido

Masters Theses

Insulin mimetics are compounds that mimic the action of insulin in the body and are currently being studied as possible therapeutic agents against diabetes. Vanadium has been identified as an element with insulin-like properties with regard to metabolic processes such as lowering blood glucose levels. Few studies have implicated vanadium in mitogenic actions such as cell growth and differentiation. We studied the action of vanadate on the expression of the insulin-induced SRE, a cis-element of the well-characterized mitogenic gene c-fos. We measured this expression by means of a plasmid containing the reporter gene luciferase linked to the sequences from c-fos …

Go to article

Activation Of Signal Proteins By Insulin And Selenate In Primary Rat Hepatocytes, Ginny Lynn Garlock Dec 1997

Activation Of Signal Proteins By Insulin And Selenate In Primary Rat Hepatocytes, Ginny Lynn Garlock

Masters Theses

Insulin has a wide range of metabolic and mitogenic effects in cells. The mechanism of insulin action in controlling these events is not well understood, but involves, at least in part, a complex phosphorylation cascade. Selenate has been shown to mimic insulin on several metabolic processes, including the regulation of glucose-6-phosphate dehydrogenase (G6PDH) gene expression. Its mechanism of action, however, is not known. To investigate the mechanisms of insulin and selenate action on the regulation of G6PDH, signal proteins from primary rat hepatocytes were first studied. Insulin and sodium selenate similarly increased tyrosyl phosphorylation of the β-subunit of the insulin …

Go to article

Isolation And Characterization Of Cadmium Hypertolerant Mutants Of Arabidopsis Thaliana, Santiago Xavier Navarro Dec 1997

Isolation And Characterization Of Cadmium Hypertolerant Mutants Of Arabidopsis Thaliana, Santiago Xavier Navarro

Masters Theses

Cadmium is an environmental pollutant which accumulates by deposition from anthropogenic activities. Plants readily take-up cadmium from soil and is concentrated in shoot tissues. Plant and animal systems are affected detrimentally by the exposure to cadmium and are known to produce metal binding peptides as part of detoxification mechanisms. In an attempt to find alternative methods of soil cleanup, efforts are being undertaken to isolate heavy metal accumulating plants. Alternatively, to reduce the accumulation of cadmium in food, plants that exclude heavy metals are also being sought. The objective of this project was to isolate mutants which can be used …

Go to article

The Brood-Rearing Habitat, Brood Home Range, And Fecundity Of The Snowy Plover (Charadrius Alexandrinus) In Coastal Southern Texas, Jeffery R. Rupert Dec 1997

The Brood-Rearing Habitat, Brood Home Range, And Fecundity Of The Snowy Plover (Charadrius Alexandrinus) In Coastal Southern Texas, Jeffery R. Rupert

Theses and Dissertations - UTB/UTPA

Habitat fragmentation has been shown to have negative effects on avian communities. I looked at the effects of corridor width and vegetation characteristics on nesting densities and breeding success of birds in the Lower Rio Grande Valley. There were definite trends in this study of increasing species richness and nesting densities with increasing corridor widths. Multiple regression revealed little correlation between tree density, diameter at breast height, tree height, canopy cover and ground cover with nesting density or nesting success. However, factors such as parasitism by the Bronzed Cowbird (Molothrus aeneus) and predation were much greater in narrower corridors. This …

Go to article

Egg Removal By Brown-Headed Cowbirds: A Field Test Of The Host Incubation Efficiency Hypothesis, Douglas Wood, Eric Bollinger Nov 1997

Egg Removal By Brown-Headed Cowbirds: A Field Test Of The Host Incubation Efficiency Hypothesis, Douglas Wood, Eric Bollinger

Faculty Research & Creative Activity

Brown-headed Cowbirds (Molothrus ater) often remove host eggs, usually to the detriment of the host's reproductive success. We tested the hypothesis that host egg size and number influence the incubation efficiency of a parasitic egg. A single House Sparrow (Passer domesticus) or Brown-headed Cowbird egg was placed in each host nest (addition), and in some nests a host egg was removed as well (addition/removal). Hatching success and incubation length were measured to determine whether host-egg removal conferred an advantage in incubation efficiency compared to simple addition of a parasitic egg. Redwinged Blackbirds (Agelaius phoeniceus) and Chipping Sparrows (Spizella passerina) served …

Go to article

Egg Removal By Brown-Headed Cowbirds: A Field Test Of The Host Incubation Efficiency Hypothesis, Douglas R. Wood, Eric K. Bollinger Nov 1997

Egg Removal By Brown-Headed Cowbirds: A Field Test Of The Host Incubation Efficiency Hypothesis, Douglas R. Wood, Eric K. Bollinger

Faculty Research & Creative Activity

Brown-headed Cowbirds (Molothrus ater) often remove host eggs, usually to the detriment of the host's reproductive success. We tested the hypothesis that host egg size and number influence the incubation efficiency of a parasitic egg. A single House Sparrow (Passer domesticus) or Brown-headed Cowbird egg was placed in each host nest (addition), and in some nests a host egg was removed as well (addition/removal). Hatching success and incubation length were measured to determine whether host-egg removal conferred an advantage in incubation efficiency compared to simple addition of a parasitic egg. Redwinged Blackbirds (Agelaius phoeniceus) and Chipping Sparrows (Spizella passerina) served …

Go to article

Effect Of 17 Days Of Bed Rest On Peak Isometric Force And Unloaded Shortening Velocity Of Human Soleus Fibers, Jeffrey J. Widrick, Janell Romatowski, James L. W. Bain, Scott W. Trappe, Todd A. Trappe, Joyce L. Thompson, David L. Costill, Danny A. Riley, Robert H. Fitts Nov 1997

Effect Of 17 Days Of Bed Rest On Peak Isometric Force And Unloaded Shortening Velocity Of Human Soleus Fibers, Jeffrey J. Widrick, Janell Romatowski, James L. W. Bain, Scott W. Trappe, Todd A. Trappe, Joyce L. Thompson, David L. Costill, Danny A. Riley, Robert H. Fitts

Biological Sciences Faculty Research and Publications

The purpose of this study was to examine the effect of prolonged bed rest (BR) on the peak isometric force (Po) and unloaded shortening velocity (Vo) of single Ca2+-activated muscle fibers. Soleus muscle biopsies were obtained from eight adult males before and after 17 days of 6° head-down BR. Chemically permeabilized single fiber segments were mounted between a force transducer and position motor, activated with saturating levels of Ca2+, and subjected to slack length steps. Vo was determined by plotting the time for force redevelopment vs. the slack step distance. …

Go to article

Whole Body I=In Vivo Vascular Compliance In Two Amphibians, Bufo Marinus And Rana Cate, Todd Micheal Hoagland Oct 1997

Whole Body I=In Vivo Vascular Compliance In Two Amphibians, Bufo Marinus And Rana Cate, Todd Micheal Hoagland

Dissertations and Theses

The mean circulatory filling pressure (MCFP), vascular compliance (C) and unstressed volume (USV) were measured in Bufo marinus and Rana catesbeiana, using an in vivo preparation. Capacitance curves were constructed by varying total vascular volume and then measuring MCFP. These capacitance curves enable the extrapolation of USV and the measurement of vascular compliance. The MCFP, C, and USV were 8.6 ± 0.2 (mmHg), 3.7 (ml· mmHg-1 · kg- 1 ) and 2.5 (ml), respectively, in B. marinus. The MCFP, C, and USV were 9.5 ± 0.1 (mmHg), 2.2 (ml· mmHg-1 · kg- 1 ) and 14.2 (ml), respectively, …

Go to article

The Interaction Between Cytoplasmic Dynein And Dynactin Is Required For Fast Axonal Transport, Clare M. Waterman-Storer, Sher B. Karki, Sergei A. Kunetsov, Joel S. Tabb, Dieter G. Weiss, George M. Langford, Erika L.F. Holzbaur Oct 1997

The Interaction Between Cytoplasmic Dynein And Dynactin Is Required For Fast Axonal Transport, Clare M. Waterman-Storer, Sher B. Karki, Sergei A. Kunetsov, Joel S. Tabb, Dieter G. Weiss, George M. Langford, Erika L.F. Holzbaur

Biology - All Scholarship

Fast axonal transport is characterized by the bidirectional, microtubule-based movement of membranous organelles. Cytoplasmic dynein is necessary but not sufficient for retrograde transport directed from the synapse to the cell body. Dynactin is a heteromultimeric protein complex, enriched in neurons, that binds to both microtubules and cytoplasmic dynein. To determine whether dynactin is required for retrograde axonal transport, we examined the effects of anti-dynactin antibodies on organelle transport in extruded axoplasm. Treatment of axoplasm with antibodies to the p150(Glued) subunit of dynactin resulted in a significant decrease in the velocity of microtubule-based organelle transport, with many organelles bound along microtubules. …

Go to article

Site-Dependent Regulation Of Population Size: A New Synthesis, Nicholas L. Rodenhouse, Thomas W. Sherry, Richard T. Holmes Oct 1997

Site-Dependent Regulation Of Population Size: A New Synthesis, Nicholas L. Rodenhouse, Thomas W. Sherry, Richard T. Holmes

Dartmouth Scholarship

The nature and extent of population regulation remains a principal unanswered question for many types of organisms, despite extensive research. In this paper, we provide a new synthesis of theoretical and empirical evidence that elucidates and extends a mechanism of population regulation for species whose individuals preemptively use sites that differ in suitability. The sites may be territories, refuges from predation, oviposition sites, etc. The mechanism, which we call site dependence, is not an alternative to density dependence; rather, site dependence is one of several mechanisms that potentially generate the negative feedback required for regulation. Site dependence has two major …

Go to article

Core Conservation Biology Monographs: A Citation Analysis, Chad E. Buckley Oct 1997

Core Conservation Biology Monographs: A Citation Analysis, Chad E. Buckley

Faculty and Staff Publications – Milner Library

Conservation biology is a multidisciplinary subject of recent origins. Analysis of cited monographs from the journal Conservation Biology resulted in a list of 47 monographs which were heavily cited for this discipline. Over half of these were from related disciplines such as ecology, genetics, evolution, population biology, statistics, and natural resource management.

Go to article

Myelin-Associated Glycoprotein Interacts With Neurons Via A Sialic Acid Binding Site At Arg118 And A Distinct Neurite Inhibition Site, Song Tang, Ying Jing Shen, Maria Elena Debellard, Gitali Mukhopadhyay, James L. Salzer, Paul R. Crocker, Marie T. Filbin Sep 1997

Myelin-Associated Glycoprotein Interacts With Neurons Via A Sialic Acid Binding Site At Arg118 And A Distinct Neurite Inhibition Site, Song Tang, Ying Jing Shen, Maria Elena Debellard, Gitali Mukhopadhyay, James L. Salzer, Paul R. Crocker, Marie T. Filbin

Publications and Research

Inhibitory components in myelin are largely responsible for the lack of regeneration in the mammalian CNS. Myelin-associated glycoprotein (MAG), a sialic acid binding protein and a component of myelin, is a potent inhibitor of neurite outgrowth from a variety of neurons both in vitro and in vivo. Here, we show that MAG’s sialic acid binding site is distinct from its neurite inhibitory activity. Alone, sialic acid–dependent binding of MAG to neurons is insufficient to effect inhibition of axonal growth. Thus, while soluble MAG-Fc (MAG extracellular domain fused to Fc), a truncated form of MAG-Fc missing Ig-domains 4 and 5, MAG(d1-3)-Fc, …

Go to article

Draft: Optimising The Worth Of The Lobster Catch: Options And Issues, Marec Pty Ltd Sep 1997

Draft: Optimising The Worth Of The Lobster Catch: Options And Issues, Marec Pty Ltd

Fisheries Management Papers

The purpose of this document is to contribute to informed discussion on alternative measures which might be adopted to optimise the worth of the lobster catch. In doing so, it provides a number of possible initiatives which could be more closely examined for adoption. Details of issues are provided which should be taken into consideration when assessing the various proposals. The industry as it is today is examined and assessed, and its achievements analysed. The possible initiatives proposed stem from this research. As a consequence of this document, the rock lobster industry could undertake to proceed with a detailed examination …

Go to article

The Ccrm Dna Methyltransferase Is Widespread In The Alpha Subdivision Of Proteobacteria, And Its Essential Functions Are Conserved In Rhizobium Meliloti And Caulobacter Crescentus, Craig Stephens, Rachel Wright, Lucy Shapiro Sep 1997

The Ccrm Dna Methyltransferase Is Widespread In The Alpha Subdivision Of Proteobacteria, And Its Essential Functions Are Conserved In Rhizobium Meliloti And Caulobacter Crescentus, Craig Stephens, Rachel Wright, Lucy Shapiro

Biology

The Caulobacter crescentus DNA methyltransferase CcrM (M.CcrMI) methylates the adenine residue in the sequence GANTC. The CcrM DNA methyltransferase is essential for viability, but it does not appear to be part of a DNA restriction-modification system. CcrM homologs are widespread in the alpha subdivision of gram-negative bacteria. We have amplified and sequenced a 258-bp region of the cerM gene from several of these bacteria, including Rhizobium meliloti, Brucella abortus, Agrobacterium tumefaciens, and Rhodobacter capsulatus. Alignment of the deduced amino acid sequences revealed that these proteins constitute a highly conserved DNA methyltransferase family. Isolation of the full-length ccrM genes from the …

Go to article

An Actin-Related Protein In Drosophila Colocalizes With Heterochromatin Protein 1 In Pericentric Heterochromatin, S Frankel, E Sigel, C Craig, Sarah C.R. Elgin, M Mooseker, S Artavanis-Tsakonas Sep 1997

An Actin-Related Protein In Drosophila Colocalizes With Heterochromatin Protein 1 In Pericentric Heterochromatin, S Frankel, E Sigel, C Craig, Sarah C.R. Elgin, M Mooseker, S Artavanis-Tsakonas

Biology Faculty Research

The actin-related proteins have been identified by virtue of their sequence similarity to actin. While their structures are thought to be closely homologous to actin, they exhibit a far greater range of functional diversity. We have localized the Drosophila actin-related protein, Arp4, to the nucleus. It is most abundant during embryogenesis but is expressed at all developmental stages. Within the nucleus Arp4 is primarily localized to the centric heterochromatin. Polytene chromosome spreads indicate it is also present at much lower levels in numerous euchromatic bands. The only other protein in Drosophila reported to be primarily localized to centric heterochromatin in …

Go to article

Detection Of Hybridization Events Between The Coyote, Canis Latrans, And The Domestic Dog, Canis Familiaris, Using Two Polymorphic Microsatellite Loci And Cranial Morphometric Analysis, John Jobe Cox Aug 1997

Detection Of Hybridization Events Between The Coyote, Canis Latrans, And The Domestic Dog, Canis Familiaris, Using Two Polymorphic Microsatellite Loci And Cranial Morphometric Analysis, John Jobe Cox

Morehead State Theses and Dissertations

A thesis presented to the faculty of the College of Science and Technology at Morehead State University in partial fulfillment of the requirements for the Degree of Master of Science in Biology by John Jobe Cox on August 26, 1997.

Go to article

Loss Of Matrix Adhesion Triggers Rapid Transformation-Selective Apoptosis In Fibroblasts, G. Mcgill, A. Shimamura, R. C. Bates, Robert E. Savage, D. E. Fisher Aug 1997

Loss Of Matrix Adhesion Triggers Rapid Transformation-Selective Apoptosis In Fibroblasts, G. Mcgill, A. Shimamura, R. C. Bates, Robert E. Savage, D. E. Fisher

Biology Faculty Works

Cell–matrix and cell–cell adhesion are recognized physiological determinants of cell growth and survival. In epithelial and endothelial cell systems, oncogenic transformation has in several cases been shown to confer resistance to apoptosis upon depriving cells of substrate adhesion. We examined the effects of oncogenic transformation in adherent versus adhesion- deprived primary embryonic fibroblasts. Whereas untransformed early passage fibroblasts undergo cell cycle arrest, their Myc/Ras- or E1A/Ras-transformed counterparts rapidly enter apoptosis when placed into suspension. This phenomenon also occurs upon incubation with a soluble, RGD-containing integrin ligand and is blocked by a peptide antagonist to ICE family proteases or by aggregation …

Go to article

Concentration-Dependent Patterning Of The Xenopus Ectoderm By Bmp4 And Its Signal Transducer Smad1, Paul A. Wilson, Giorgio Lagna, Atsushi Suzuki, Ali Hemmati-Brivanlou Aug 1997

Concentration-Dependent Patterning Of The Xenopus Ectoderm By Bmp4 And Its Signal Transducer Smad1, Paul A. Wilson, Giorgio Lagna, Atsushi Suzuki, Ali Hemmati-Brivanlou

Biology

Morphogens are thought to establish pattern in early embryos by specifying several cell fates along a gradient of concentration; a well-studied example is the Drosophila protein decapentaplegic (DPP) acting in the wing disc. Recent work has established that bone morphogenetic protein 4 (BMP4), the vertebrate homologue of DPP, controls the fundamental choice between neural and epidermal fates in the vertebrate ectoderm, under the control of antagonists secreted by the organizer region of the mesoderm. We now show that BMP4 can act as a morphogen, evoking distinct responses in Xenopus ecto-dermal cells at high and low concentrations, in a pattern consistent …

Go to article

Partial Characterization Of Na+, K+-Atpase And Its Gill And Antennal Gland Osmoregulatory Role In The Crayfish, Orconectes Putnami, Michael E. Fultz Aug 1997

Partial Characterization Of Na+, K+-Atpase And Its Gill And Antennal Gland Osmoregulatory Role In The Crayfish, Orconectes Putnami, Michael E. Fultz

Morehead State Theses and Dissertations

A thesis presented to the faculty of the College of Science and Technology at Morehead State University in partial fulfillment of the requirements for the Degree of Master of Science in Biology by Michael E. Fultz on August 1, 1997.

Go to article

Marine Farm Planning And Consultation Processes In Western Australia, Dave Everall Aug 1997

Marine Farm Planning And Consultation Processes In Western Australia, Dave Everall

Fisheries Management Papers

The development of a sustainable aquaculture industry in Western Australia is considered to be a high priority by the Government. The marine farming industry has a bright future in Western Australia, but there is a need to balance its developing needs for suitable waters with those of existing activities, and with community expectations for accountability and transparency in the resolution of equity and resource sharing decisions. The purpose of this report is to review the existing planning and consultation processes for pearling and aquaculture in WA and recommend how they may be improved and incorporated into a single process. It …

Go to article

Corticosterone Levels During Nest Departure Of Juvenile American Kestrels, Julie Heath Aug 1997

Corticosterone Levels During Nest Departure Of Juvenile American Kestrels, Julie Heath

Biology Faculty Publications and Presentations

Many avian behavior patterns, such as breeding, migration and territoriality, are correlated with changes in hormone levels. Elevated levels of corticosterone, an adrenal steroid hormone, are associated with increased foraging and increased activity levels in birds. Young birds about to take their first flight may benefit from elevated plasma corticosterone levels that facilitate locomotor activity and foraging behavior while they are developing flight and hunting skills. I examined the relationship between corticosterone levels and the timing of nest departure in nestling American Kestrels (Falco sparverius). American Kestrels are cavity nesters and typically depart from the nest between 25-30 …

Go to article

Oxyconformity In Burrow-Dwelling Crustaceans : Aerobic Metabolism Of Hemisquilla Ensigera Californiensis, Leandra P. Peters Aug 1997

Oxyconformity In Burrow-Dwelling Crustaceans : Aerobic Metabolism Of Hemisquilla Ensigera Californiensis, Leandra P. Peters

Loma Linda University Electronic Theses, Dissertations & Projects

Hemisquilla ensigera califomiensis is an active burrow-dwelling stomatopod crustacean common off the coast of Southern California (Basch and Engle, 1989). In this experiment I measured the typical burrow oxygen level, time taken to deplete the oxygen in an inhabited, capped burrow, and tested the hypothesis that H. ensigera, like other burrow dwellers that have been examined, is an oxyregulator; and that like crustaceans in general, they have only limited anaerobic capabilities. Contrary to expectations, I found that H. ensigera is an oxyconformer or at best a weak oxyregulator, and that the species has substantial anaerobic capacity. Since it was …

Go to article

First Prev Next Last