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Animal Sciences

2003

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Articles 1 - 30 of 57

Full-Text Articles in Physical Sciences and Mathematics

Body Mass Of Late Quaternary Mammals (Data Set), Felisa A. Smith, S. Kathleen Lyons, S.K. Morgan Ernest, Kate E. Jones, Kansas State University, Tamar Dayan, Pablo A. Marquet, James H. Brown, John P. Haskell Dec 2003

Body Mass Of Late Quaternary Mammals (Data Set), Felisa A. Smith, S. Kathleen Lyons, S.K. Morgan Ernest, Kate E. Jones, Kansas State University, Tamar Dayan, Pablo A. Marquet, James H. Brown, John P. Haskell

Faculty Publications in the Biological Sciences

The purpose of this data set was to compile body mass information for all mammals on Earth so that we could investigate the patterns of body mass seen across geographic and taxonomic space and evolutionary time. We were interested in the heritability of body size across taxonomic groups (How conserved is body mass within a genus, family, and order?), in the overall pattern of body mass across continents (Do the moments and other descriptive statistics remain the same across geographic space?), and over evolutionary time (How quickly did body mass patterns iterate on the patterns seen today? Were the Pleistocene ...


Specific Dynamic Action, Growth And Development In Larval Atlantic Cod, Gadus Morhua, Jessica A. Geubtner Dec 2003

Specific Dynamic Action, Growth And Development In Larval Atlantic Cod, Gadus Morhua, Jessica A. Geubtner

Electronic Theses and Dissertations

The larval stage of marine fish is a period of rapid growth and development. Atlantic cod (Gadus morhua) are approximately 4-5 rnm in length upon hatch and feed endogenously from their yolk sac for the first week. After this time, larval cod must successfully capture live prey to survive and to fuel high growth rates of greater than 10%d". Previous studies have found that during exogenous feeding and at growth rates greater than 8%d1 larvae experience what appears to be cost free growth, where mass specific metabolic rate does not decrease with increasing mass. Due to size and ...


An Investigation Of The Cumulative Impacts Of Shrimp Trawling On Mud Bottom Fishing Grounds In The Gulf Of Maine: Effects On Habitat And Macrofaunal Community Structure, Anne W. Simpson Dec 2003

An Investigation Of The Cumulative Impacts Of Shrimp Trawling On Mud Bottom Fishing Grounds In The Gulf Of Maine: Effects On Habitat And Macrofaunal Community Structure, Anne W. Simpson

Electronic Theses and Dissertations

Despite the widespread occurrence of trawl fisheries on mud-bottoms, there is limited knowledge concerning the effects of trawling induced disturbance on these habitats and their resident macrofaunal communities. I investigated the cumulative impacts of seasonal commercial shrimp trawling on infaunal habitat and macrofaunal community structure on two mud-bottom fishing grounds in the Gulf of Maine from June 2000 - December 2001. One fishing ground located near the Outer Pumpkin Ledges (Pumpkin) experienced trawling activity during the 2000-2001 fishing season. In contrast, the other fishing ground near Monhegan Island was not trawled during the same period because shrimp abundances were low. Consequently ...


The Role Of Larval Thermal Tolerance In The Distribution Of Blue Mussel Species Within The Gulf Of Maine, Susan J. Limbeck Dec 2003

The Role Of Larval Thermal Tolerance In The Distribution Of Blue Mussel Species Within The Gulf Of Maine, Susan J. Limbeck

Electronic Theses and Dissertations

Two species of blue mussel, Myrilus edulis and Myrilus trossulus, are sympatric throughout much of the Canadian Maritime Provinces and into the Gulf of Maine. While the distribution of M edulis extends south to the Mid-Atlantic, that of M. trossulus ends abruptly in the Gulf of Maine. I have hypothesized that these differences in adult distribution are the result of species-specific variation in larval thermal tolerances. Previously, it has been shown that when reared at 20 OC, from 36 hour post-fertilization through settlement, M. trossulus had significantly higher mortality rates than M. edulis. This study examined whether species-specific differences in ...


Analysis Of The Spatial Dynamics Of The American Lobster (Homarus Americanus) Fishery Along The Coast Of Maine, Kevin M. Scheirer Dec 2003

Analysis Of The Spatial Dynamics Of The American Lobster (Homarus Americanus) Fishery Along The Coast Of Maine, Kevin M. Scheirer

Electronic Theses and Dissertations

The American lobster (Homarus americanus) supports the most valuable commercial fishery in the northeastern United States, thus the fishery is critical to Maine's economy. No systematic study has been done to collect information about, identify, and quantify the spatial dynamics of the Maine lobster fishery. This project helps to provide a better understanding of Maine's lobster fishery dynamics, and it will aid f'iture efforts to improve the stock assessment of Maine's lobster fishery. The analysis consists of three distinct parts: (1) comparison of data collected by two separate fishery dependent sampling programs; (2) spatial analysis of ...


The Translocation Of Golden Perch, Murray Cod And Australian Bass, Into And Within Western Australia, For The Purposes Of Recreational Stocking, Domestic Stocking And Commercial And Non-Commercial Aquaculture. A Discussion Paper., Department Of Fisheries Dec 2003

The Translocation Of Golden Perch, Murray Cod And Australian Bass, Into And Within Western Australia, For The Purposes Of Recreational Stocking, Domestic Stocking And Commercial And Non-Commercial Aquaculture. A Discussion Paper., Department Of Fisheries

Fisheries management papers

This discussion paper has been prepared to provide information to assist in assessment of the possible impact of the translocation of golden perch (Macquaria ambigua), Murray cod (Maccullochella peelii peelii) and Australian bass (Macquaria novemaculeata) into and within Western Australia, for the purposes of recreational stocking, domestic stocking, commercial and non-commercial aquaculture. In assessing the translocation of any aquatic species, economic and social benefits must be balanced with biological and environmental risks.


Habitat Use Of Sympatrically Nesting Fish Crows And American Crows, John Tanacredi Ph.D., Brook Lauro Nov 2003

Habitat Use Of Sympatrically Nesting Fish Crows And American Crows, John Tanacredi Ph.D., Brook Lauro

Faculty Works: CERCOM

We examined habitat use of sympatric Fish Crows (Corvus ossifragus) and American Crows (C. brachyrhynchos) nesting in the vicinity of waterbird breeding locations at the Rockaway Peninsula, New York City. Fish Crows nested significantly more often at natural habitats, including coastal dunes and salt marsh islands; American Crows nested significantly more often at residential and recreational areas. In regard to potential foraging areas, Fish Crows nested closer to waterbird colonies and to the water's edge while American Crows nested closer to a garbage source and to lawns. Fish Crows nested significantly more often in deciduous trees that were native ...


Evaluation Of Striped Bass Stocks In Virginia, Monitoring And Tagging Studies, 1999-2003 Annual Report, 1 August 2002 - 31 August 2003, Philip W. Sadler, Robert J. Latour, Robert E. Harris, Julia Ellis, John E. Olney Oct 2003

Evaluation Of Striped Bass Stocks In Virginia, Monitoring And Tagging Studies, 1999-2003 Annual Report, 1 August 2002 - 31 August 2003, Philip W. Sadler, Robert J. Latour, Robert E. Harris, Julia Ellis, John E. Olney

Reports

This report presents the results of striped bass (Marone saxatilis) tagging and monitoring activities in Virginia during the period 1 August 2002 through 31 August 2003. It includes an assessment ofthe biological characteristics of striped bass taken from the 2003 spring spawning run, estimates of annual survival based on annual spring tagging, and the results ofthe fall2002 directed mortality study that is cooperative with the Maryland Department of Natural Resources. The information contained in this report is required by the Atlantic States Marine Fisheries Commission and is used to implement a coordinated management plan for striped bass in Virginia, and ...


Inventory Of The Land Conservation Values Of The Houtman Abrolhos Islands., Department Of Fisheries. Western Australia Oct 2003

Inventory Of The Land Conservation Values Of The Houtman Abrolhos Islands., Department Of Fisheries. Western Australia

Fisheries management papers

There is growing pressure for increased development on the Houtman Abrolhos Islands (Abrolhos Islands). Much work on the natural, historical and cultural values of the islands has been undertaken. This document is a review of this work, which provides an overview of the conservation values of the islands, and should prove useful in considering the selection, design and evaluation of proposed developments at the Abrolhos Islands. Based on existing information, the purpose of the Review of the Land Conservation Values of the Houtman Abrolhos Islands is to: • identify and map areas of conservation value (natural, historical and cultural); and • assess ...


The Crest, Fall 2003, Virginia Institute Of Marine Science Oct 2003

The Crest, Fall 2003, Virginia Institute Of Marine Science

Reports

Table of Contents:

  • VIMS hires new Dean and Director
  • Hurricane Isabel hinders research
  • VIMS acquires unique new vessel
  • Pair pursue promise of proteomics
  • Research questions environmental safety of flame retardant
  • VIMS scientists quantify Isabel's impact on Bay
  • Schaffner Elected ERF President
  • ABC continues oyster work with Academy validation
  • Newman wins SETAC Founders Award
  • Faculty help bring minorities to marine science
  • Sea Grant sponsors seafood education programs
  • VIMS hosts international sediment conference
  • Students chosen as Knauss Fellows
  • Aquanauts visit inner space
  • Study highlights link between biodiversity and ecosystem function
  • CCRM kicks off trans-Atlantic collaboration


Sheep Updates 2003 - Wool, Richard Coole, Stephen Gherardi, Chris Oldham, K. Curtis, J. Stanton, Johan Greeff, Chris Oldham, Mike Hyder, Beth Pagamoni, Andrew Thompson, Tom Plaisted, Kazue Tanaka, Mike Ferguson, Darren Gordon, Andrew Peterson, Peter Sommerville Aug 2003

Sheep Updates 2003 - Wool, Richard Coole, Stephen Gherardi, Chris Oldham, K. Curtis, J. Stanton, Johan Greeff, Chris Oldham, Mike Hyder, Beth Pagamoni, Andrew Thompson, Tom Plaisted, Kazue Tanaka, Mike Ferguson, Darren Gordon, Andrew Peterson, Peter Sommerville

Sheep Updates

This session covers six papers from different authors:1.‘Pastures from space’ - an opportunity to increase the profitability of sheep production Richard Coole Farmer Kojonup W.A. Stephen Gherardi Chris Oldham Department of Agriculture Western Australia 2. K. Curtis Department of Agriculture WA J. Stanton Department of Agriculture WA and Curtin University 3. Is selection of ewe hogget replacement on measurement profitable? Johan Greeff Department of Agriculture of Western Australia 4. Optimising the nutrition/grazing management of ewe flocks Chris Oldham Mike Hyder Beth Paganoni Department of Agriculture of Western Australia Andrew Thompson Department of Primary Industries, Hamilton, Victoria Tom ...


Sheep Updates 2003 - Pastures, Ed Barrett-Lennard, Hayley Norman, Robyn Dynes, David Masters, David Henry, Stephen Gherardi, Graham Donald, Asoka Edirisinghe, Chris Oldham, Richard Smith, Joanne Sneddon, Mike Hyder, Andrew Thompson, Kazue Tanaka, Roy Latta, Chris Matthews, Brad Nutt, Angela Loi, Tim Wiley Aug 2003

Sheep Updates 2003 - Pastures, Ed Barrett-Lennard, Hayley Norman, Robyn Dynes, David Masters, David Henry, Stephen Gherardi, Graham Donald, Asoka Edirisinghe, Chris Oldham, Richard Smith, Joanne Sneddon, Mike Hyder, Andrew Thompson, Kazue Tanaka, Roy Latta, Chris Matthews, Brad Nutt, Angela Loi, Tim Wiley

Sheep Updates

This session covers seven papers from different authors: 1. Pastures for saline land, Ed Barrett-Lennard 1Department of Agriculture, Western Australia, Hayley Norman, Robyn Dynes and David Masters CSIRO Livestock Industries, Centre for Mediterranean Agricultural Research, Floreat Park, 2. Feeding value - the essential link between pastures and animals CSIRO Livestock Industries, Centre for Environmental and Life Sciences 3. ‘Pastures from space’ - how do we do it, how well do we do it and what do producers think about it? Stephen Gherardi Department of Agriculture Western Australia Graham Donald Asoka Edirisinghe Dave Henry CSIRO Livestock Industries Chris Oldham Department of Agriculture Western ...


How Rapidly Can Maternal Behavior Affecting Primary Sex Ratio Evolve In A Reptile With Environmental Sex Determination?, Carrie L. Morjan Aug 2003

How Rapidly Can Maternal Behavior Affecting Primary Sex Ratio Evolve In A Reptile With Environmental Sex Determination?, Carrie L. Morjan

Zoology and Genetics Publications

Theoretical models identify maternal behavior as critical for the maintenance and evolution of sex ratios in organisms with environmental sex determination (ESD). Maternal choice of nest site is generally thought to respond more rapidly to sex ratio selection than environmental sensitivity of offspring sex (threshold temperatures) in reptiles with temperature‐dependent sex determination (TSD, a form of ESD). However, knowledge of the evolutionary potential for either of these traits in a field setting is limited. I developed a simulation model using local climate data and observed levels of phenotypic variation for nest‐site choice and threshold temperatures in painted turtles ...


Hydroperiod Of Wetlands And Reproduction In Wood Frogs (Rana Sylvatica) And Spotted Salamanders (Ambystoma Maculatum), Mary Beth Kolozsvary Aug 2003

Hydroperiod Of Wetlands And Reproduction In Wood Frogs (Rana Sylvatica) And Spotted Salamanders (Ambystoma Maculatum), Mary Beth Kolozsvary

Electronic Theses and Dissertations

Many amphibians rely on wetlands for reproduction and the differential distribution of amphibian species along a gradient of wetland permanence is striking, yet not absolute. Wood frogs (Rana sylvatica) and spotted salamanders (Ambystoma maculatum) are thought to rely on seasonal wetlands for greatest breeding success, but there is little documentation of their reliance on these or other habitats. In my first chapter, I studied these species in wetlands across a hydrologic gradient from seasonal wetlands of short flood duration to permanently flooded sites. My results indicate that wood frogs have greatest reproductive effort and success in seasonal wetlands of short ...


Resilience Of Green Sea Urchin (Strongylocentrotus Droebachiensis) Populations Following Fishing Mortality: Marine Protected Areas, Alternate Stable States, And Larval Ecology, John Vavrinec Iii Aug 2003

Resilience Of Green Sea Urchin (Strongylocentrotus Droebachiensis) Populations Following Fishing Mortality: Marine Protected Areas, Alternate Stable States, And Larval Ecology, John Vavrinec Iii

Electronic Theses and Dissertations

The green sea urchin Strongylocentrotus droebachiensis has been aggressively fished in Maine since 1986 resulting in severe population declines throughout portions of the state. This research used Marine Protected Areas (MPAs) to evaluate the potential for recovery in depleted sea urchin populations. It was necessary to not only look at the direct impacts of the MPAs, but also at larval transport / supply and community interactions to gain a better understanding of the system. We found that MPAs in the Gulf of ~a!ne were of varied utility to restoring depleted sea urchin populations depending on location and community structure. MPAs ...


Draft Plan Of Management For The Proposed Point Quobba Fish Habitat Protection Area., Department Of Fisheries Aug 2003

Draft Plan Of Management For The Proposed Point Quobba Fish Habitat Protection Area., Department Of Fisheries

Fisheries management papers

Point Quobba is a popular site for locals and tourists for beach activities, fishing and snorkelling, and as a place for children to learn to swim and gain an awareness of the marine environment. The marine life and habitats of the area are of considerable scientific and recreational interest and are highly valued in the local community. However, they are at risk from their high level of use and from conflict between users due to their proximity to popular tourism, boat ramp, camping and settlement areas on-shore.


Management Of The Proposed Geographe Bay Blue Swimmer And Sand Crab Managed Fishery., Jane Borg Aug 2003

Management Of The Proposed Geographe Bay Blue Swimmer And Sand Crab Managed Fishery., Jane Borg

Fisheries management papers

This discussion paper has been prepared following an extensive consultation process, to encourage continued public involvement in the development of management arrangements for the blue swimmer and sand crab resources of Geographe Bay. These proposed management arrangements affect both commercial and recreational fishers.


Plan Of Management For The Miaboolya Beach Fish Habitat Protection Area, Shane Alymore, Sarah Anderson Jul 2003

Plan Of Management For The Miaboolya Beach Fish Habitat Protection Area, Shane Alymore, Sarah Anderson

Fisheries management papers

The aim of this management plan is to protect and rehabilitate the aquatic habitat of Miaboolya Beach, the associated mangrove ecosystem, and involve the community in their management. By setting the area aside as a FHPA, the Department of Fisheries has established a framework to promote and actively conserve all the habitats within the Miaboolya system, as described in Section 3 of this document.


Geographic Variation In The Morphology Of Crotalus Horridus (Serpentes: Viperidae), John Robert Allsteadt Jul 2003

Geographic Variation In The Morphology Of Crotalus Horridus (Serpentes: Viperidae), John Robert Allsteadt

Biological Sciences Theses & Dissertations

The Timber Rattlesnake (Crotalus horridus) occurs in discontinuous populations throughout the eastern and central United States. The species exhibits high levels of polymorphism in morphological traits, especially in coloration and pattern. Previous studies recognized either distinct northern and southern subspecies or three regional morphs (northern, southern, and western), but conflicting data sets and limited geographic sampling of previous studies have left the relationships among those regional variants unclear. In this study, univariate and multivariate statistics, together with a geographic information system, were used to analyze geographic variation in 36 morphological characters recorded from 2,420 specimens of C. horridus across ...


The Crest, Summer 2003, Virginia Institute Of Marine Science Jul 2003

The Crest, Summer 2003, Virginia Institute Of Marine Science

Reports

Table of Contents:

  • TBT or not TBT: Collaborators Search for a Solution to Pollution
  • VIMS research helps protect Navy ships from mines
  • Switch to Circle Hooks Would Benefit White Marlin
  • Do Tags Put a Drag on Marine Organisms?
  • Video Technology Links VIMS to the World
  • For-hire Fishing Captains Drawn to Regional Workshops
  • Teachers Gain Hands-On Research Experience
  • Pair Use Neural Network to Predict Hurricane Waves
  • Seamount Census Reveals New and Poorly Known Marine Life
  • VIMS Helps Local Students Aid Oyster Restoration Effort
  • From Counting Fish to Implementing Energy Policy


Categorization Of Shellfish Tmdl Sites Final Report, Julie Herman, Carl Hershner, Howard Kator Jun 2003

Categorization Of Shellfish Tmdl Sites Final Report, Julie Herman, Carl Hershner, Howard Kator

Reports

There were two important goals for this project, including the assembly and compilation of digital data for the Coastal Plain and tidal waters of Virginia, and the categorization of the Division of Shellfish Sanitation (DSS) shellfish growing areas to determine if some are similar enough for water quality models to be effectively transferred from the modeled growing areas to other areas. This report summarizes the data and statistical analyses and discusses the results. Note: The digital data has a very fine resolution. The maps displayed in this report cannot convey this information on 8.5x11" paper. All digital data layers ...


Evaluating Recruitment Of American Eel, Anguilla Rostrata, To The Potomac River Spring 2003, Marcel M. Montane, M. Todd Mathes, Hank Brooks Jun 2003

Evaluating Recruitment Of American Eel, Anguilla Rostrata, To The Potomac River Spring 2003, Marcel M. Montane, M. Todd Mathes, Hank Brooks

Reports

The Atlantic States Marine Fisheries Commission (ASMFC) adopted the Interstate Fishery Management Plan (FMP) for the American eel in November 1999. The FMP focuses on increasing the states’ efforts to collect data on the resource and the fishery it supports through both fishery dependent and fishery independent studies. To this end, member jurisdictions (including the PRFC) agreed to implement an annual abundance survey for young of year (YOY) American eels. The survey is intended to “…characterize trends in annual recruitment of young of year eels over time [to produce a] qualitative appraisal of the annual recruitment of American eel to ...


Integrated Coastal Management & Sustainable Aquaculture Development In The Adriatic Sea, Republic Of Croatia, Anamarija Frankic Jun 2003

Integrated Coastal Management & Sustainable Aquaculture Development In The Adriatic Sea, Republic Of Croatia, Anamarija Frankic

Reports

This report discusses development of responsible aquaculture in the Republic of Croatia as part of the integrated coastal zone management and sustainable development of marine, coastal and islands natural and human resources. Based on literature review examples of aquaculture development and its constraints are presented, as well as possible solutions and recommendations. In addition, one attachment document provides brief summary information regarding Mediterranean lessons in aquaculture practices, while second document provides draft guidelines for sustainable aquaculture development in Croatia. Report is a contribution to the project ‘The Integrated Coastal Zone Management for Croatia with special focus on aquaculture’, administered by ...


Assessing The Benefits Of Misting–Cooling Systems For Growing/Finishing Swine As Affected By Environment And Pig Placement Date, Thomas C. Bridges, Larry W. Turner, Richard S. Gates, Douglas G. Overhults May 2003

Assessing The Benefits Of Misting–Cooling Systems For Growing/Finishing Swine As Affected By Environment And Pig Placement Date, Thomas C. Bridges, Larry W. Turner, Richard S. Gates, Douglas G. Overhults

Biosystems and Agricultural Engineering Faculty Publications

The NCPIG swine growth model was used to evaluate swine growth performance for Wilmington, North Carolina; Bardstown and Mayfield, Kentucky; and Oklahoma City, Oklahoma as influenced by the use of a misting–cooling system. Five pig placement dates (Julian days 106, 126, 146, 166, and 186) were evaluated for each location using 22 years of weather data (1978–1999). The use of a misting system, while quite variable, was found to be generally profitable, reducing the length of the time to reach market weight. As the placement date increased, the average return to misting ($/pig/year) decreased from $8.12 ...


Fluctuations In Chinook Salmon (Oncorhynchus Tshawytscha) Counts At Three Lower Columbia River Spawning Sites, Eric Michael Loomis May 2003

Fluctuations In Chinook Salmon (Oncorhynchus Tshawytscha) Counts At Three Lower Columbia River Spawning Sites, Eric Michael Loomis

UNLV Theses, Dissertations, Professional Papers, and Capstones

Several hypotheses were developed to explore the pronounced increase in Chinook salmon (Oncorhynchus tshawytscha) returning to spawning grounds at the Cowlitz, Kalama, and Lewis Rivers, three tributaries of the lower Columbia River. The study was conducted using data compiled over a ten-year span from 1991-2001. Preliminary indications are that trends in climate are linked to these increases, with the absence of El Niño events and fluctuations in winter precipitation as likely explanations of these phenomena. The unique nature of Chinook life cycles causes them to utilize a variety of habitats that require ideal conditions for maximum survival rates. Correlations between ...


Population Dynamics And Spatial Analysis Of The Maine Green Sea Urchin (Strongylocentrotus Droebachiensis) Fishery, Robert C. Grabowski May 2003

Population Dynamics And Spatial Analysis Of The Maine Green Sea Urchin (Strongylocentrotus Droebachiensis) Fishery, Robert C. Grabowski

Electronic Theses and Dissertations

Fisheries research on the green sea urchin in Maine has been limited despite its importance to the state's fishing industry. The objective of this thesis was to generate critical information for the management and monitoring of the Maine green sea urchin fishery. In particular there are three main areas of interest: (1) an investigation of biological reference points; (2) spatial analysis and biomass estimation, and (3) the development of a simulation framework approach to determine an optimal sampling strategy for the fishery-independent survey program. Biological reference points are markers conlrnonly used to monitor and manage fisheries. For the Maine ...


Lipid Solubilization By Marine Benthic Invertebrates, Ian M. Voparil May 2003

Lipid Solubilization By Marine Benthic Invertebrates, Ian M. Voparil

Electronic Theses and Dissertations

This work characterized the size of lipoidal colloids in benthic invertebrates' guts, using contact angle dilutions and imaging the fluorescence of the hydrophobic probe Nile Red. Deposit feeders and Nereis virens ingesting sediment were found to have micelles rather than emulsions in the gut. Gut fluids from Arenicola manna (a deposit-feeding polychaete) readily formed emulsions when incubated with mussel meat (Mytilus edulis; 80 g-mussel L"-gut fluid), suggesting that micelles form due to a paucity of emulsifying lipids in the gut. Lipid tracer contained in emulsion droplets was twice as likely to be captured by sediment than was tracer in ...


Scope For Activity, Specific Dynamic Action And Growth In Early Juvenile Stages Of Atlantic Cod, Gadus Morhua, Sorren Lund Hansen May 2003

Scope For Activity, Specific Dynamic Action And Growth In Early Juvenile Stages Of Atlantic Cod, Gadus Morhua, Sorren Lund Hansen

Electronic Theses and Dissertations

Growth rates of early life stages of Atlantic cod (Gadus morhua) are very high, but decline, as the fish grow larger. Little is know about the physiological processes that facilitate and regulate this growth pattern. In this study, feeding and swimming metabolism were measured in individual juvenile Atlantic cod (Gadus morhua) in order to investigate how energy are allocated to swimming and growth in fast growing stages of fishes. Metabolic rates were measured by the means of oxygen consumption using two "Brett-type" respirometers. The metabolic measurements were repeated several times in individual juvenile Atlantic cod with a wet body mass ...


The Use Of Acoustics To Resolve Nightly Excursions Of Hyperbenthos, Heather U. Abello May 2003

The Use Of Acoustics To Resolve Nightly Excursions Of Hyperbenthos, Heather U. Abello

Electronic Theses and Dissertations

Acoustic analysis of die1 vertical migration in the Darnariscotta River estuary, Maine, showed a fairly regular nightly increase in biovolume (mm3 m'3) of organisms in the water column, presumed to be due to emergence, the entry of hyperbenthic organisms into the water column. Timing of these events was significantly correlated with time of sunset and time of sunrise for more than 50% of the dates where emergence and re-entry could be identified, between June and October 2002. Emergence traps indicate that the mysid shrimp, Neomysis americana, is the predominant migrator. Daily fluctuations in irradiance influence the timing of emergence ...


Modeling Bird Species Occurrence In Current And Future Landscapes, Stephen Nicholas Matthews May 2003

Modeling Bird Species Occurrence In Current And Future Landscapes, Stephen Nicholas Matthews

Electronic Theses and Dissertations

With mounting evidence that global temperatures have increased significantly over the last century and the projections of greater changes in climate by the end of this century, understanding the potential consequences of these changes for species is essential to conservation efforts. Here I evaluate the potential response of birds to projected climate change by using regression tree analysis to create models of species distributions under current conditions from Breeding Bird Survey data and then project these models onto General Circulation Model (GCM) scenarios of global climate change. Before modeling species responses to climate change, I selected seventeen bird species to ...