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Articles 1 - 30 of 174
Full-Text Articles in Entire DC Network
Trophic Ecology Of Black Swallowers (Scombriformes: Chiasmodontidae: Chiasmodon) In The Deep-Pelagic Gulf Of Mexico, Travis J. Kirk
Trophic Ecology Of Black Swallowers (Scombriformes: Chiasmodontidae: Chiasmodon) In The Deep-Pelagic Gulf Of Mexico, Travis J. Kirk
All HCAS Student Capstones, Theses, and Dissertations
The ecology of deep-pelagic predatory fishes remains poorly understood despite their importance as ecosystem regulators and energy transfer vectors. This study investigated the trophic ecology of three species of the predatory fish genus Chiasmodon (“black swallowers”) in the Gulf of Mexico, a region that serves as an analog for the global low-latitude deep pelagial, the world’s largest cumulative ecosystem. Foraging habits (e.g., selectivity, chronology, daily ration) of an “advanced” evolutionary fish in a system that is otherwise dominated by basal fish taxa, were quantitatively estimated via high-resolution stomach content analysis. A quantitative dataset of both predator and prey abundance, the …
The Effect Of Water Flow Rates On The Survival And Growth Rates Of Three Caribbean Bouldering Coral Species Juveniles In An Indoor Versus Outdoor Environment, Ian Michael Johnson
The Effect Of Water Flow Rates On The Survival And Growth Rates Of Three Caribbean Bouldering Coral Species Juveniles In An Indoor Versus Outdoor Environment, Ian Michael Johnson
All HCAS Student Capstones, Theses, and Dissertations
Coral reefs are vital ecosystems for the world’s oceans and humanity; however, they are threatened by climate change, disease, and local anthropogenic stressors, and need assistance to recover. Traditional reef restoration efforts (fragmentation and outplanting are helping but are limited in effectiveness by not increasing genetic diversity. Ex situ sexual propagation for corals provides new, genetically different coral recruits. However, this process is laborious, expensive and time consuming, especially at the scale required to effectively contribute to the widespread recovery. To lower costs, two key parameters that require optimization to hasten the growth of coral recruits are water flow and …
Fairy Shrimp (Anostraca) In The Vernal Pools Of Eastern Washington, Megan Garvey
Fairy Shrimp (Anostraca) In The Vernal Pools Of Eastern Washington, Megan Garvey
EWU Masters Thesis Collection
Vernal pools are ephemeral wetlands that retain water annually from winter and spring precipitation and snowmelt but are dry the rest of the year. Though important habitats and sources of freshwater biodiversity, they are little accounted for in wetland conservation and restoration practices. Like much of the world’s wetlands, they have seen a significant decline from anthropogenic impacts and conversion for alternative land use. Pools are also at significant risk due to the impacts of climate change and invasive species. These small temporary water bodies perform vital ecosystem services and are host to rare and endemic species. Anostraca, or fairy …
Hard-Bottom Habitats Support Commercially Important Fish Species: A Systematic Review For The North Atlantic Ocean And Baltic Sea, Hugo Flávio, Rochelle D. Seitz, David Eggleston, Jon C. Svendsen, Josianne Støttrup
Hard-Bottom Habitats Support Commercially Important Fish Species: A Systematic Review For The North Atlantic Ocean And Baltic Sea, Hugo Flávio, Rochelle D. Seitz, David Eggleston, Jon C. Svendsen, Josianne Støttrup
VIMS Articles
Hard-bottom habitats span a range of natural substrates (e.g., boulders, cobble) and artificial habitats (e.g., the base of wind turbines, oil platforms). These hard-bottom habitats can provide a variety of ecosystem services, ranging from the enhancement of fish biomass and production to providing erosion control. Management decisions regarding the construction or fate of hard-bottom habitats require information on the ecological functions of these habitats, particularly for species targeted in ecosystem-based fisheries management. This study provides a systematic review of the relationships of various hard-bottom habitats to individual commercially harvested species that are managed jointly across the Atlantic by the International …
Empirical Valuation Of Primary And Alternative Nursery Habitats For The Blue Crab Callinectes Sapidus In Chesapeake Bay, Alexander C. Hyman
Empirical Valuation Of Primary And Alternative Nursery Habitats For The Blue Crab Callinectes Sapidus In Chesapeake Bay, Alexander C. Hyman
Dissertations, Theses, and Masters Projects
The blue crab (Callinectes sapidus) is a commercially and ecologically importantspecies found along the Atlantic coast of North and South America. These crustaceans play a critical role in coastal ecosystems, serving as both predators and prey in the food web. The blue crab supports a major fishery in Chesapeake Bay, where the species is a cultural icon. Juvenile blue crabs, the smallest and most vulnerable size classes of individuals, are reliant upon structurally complex habitats. Population dynamics of this species are therefore influenced by spatiotemporally fluctuating environmental variables, such as habitat availability. Understanding blue crab ecology is essential for managing …
Phytoplankton Community Of Boalia Khal Tributary Of The Halda River, Chattogram, Bangladesh, Md. Shafiqul Islam, M.A. Azadi, Munira Nasiruddin
Phytoplankton Community Of Boalia Khal Tributary Of The Halda River, Chattogram, Bangladesh, Md. Shafiqul Islam, M.A. Azadi, Munira Nasiruddin
Journal of Bioresource Management
Boalia Khal is one of the important tributaries of the River Halda. The productivity of the Boalia Khal tributary of the Halda River mainly depends on the phytoplankton diversity. A study was conducted for two years period from January 2017 to December 2018 to identify the phytoplankton community of the Boalia Khal tributary. A total of 61 species of phytoplankton under 37 genera belonging to 8 classes were recorded. The dominant group of phytoplankton was 25 species of Diatoms (40.98 %) followed by 18 species of Green Algae (29.5 %), 9 species of Euglenophytes (14.75 %), 7 species of Blue …
Age Based Assessment In The Sea Scallop Placopecten Magellanicus: A Pilot Study - Final Report, Roger L. Mann, David Rudders, Sally Roman, Melissa Southworth, Kaitlyn R. Clark
Age Based Assessment In The Sea Scallop Placopecten Magellanicus: A Pilot Study - Final Report, Roger L. Mann, David Rudders, Sally Roman, Melissa Southworth, Kaitlyn R. Clark
Reports
If the current sea scallop fishery is well managed with a Catch At Size Analysis (CASA) length structured model, then why bother with an age based assessment? The success of the CASA based approach, in conjunction with management measures, is demonstrated by the development of the scallop fishery over the past two decades to its current status as the one of the most valuable fisheries on the Atlantic coast of the United States (NOAA, 2021). But, even the best length-based model can be improved by the addition of age data. An age-based model calibrates a length-based model, including a description …
Spatiotemporal Modeling Of Nursery Habitat Using Bayesian Inference: Environmental Drivers Of Juvenile Blue Crab Abundance, A. Challen Hyman, Grace S. Chiu, Mary C. Fabrizio, Rom Lipcius
Spatiotemporal Modeling Of Nursery Habitat Using Bayesian Inference: Environmental Drivers Of Juvenile Blue Crab Abundance, A. Challen Hyman, Grace S. Chiu, Mary C. Fabrizio, Rom Lipcius
VIMS Articles
Nursery grounds provide conditions favorable for growth and survival of juvenile fish and crustaceans through abundant food resources and refugia, and enhance secondary production of populations. While small-scale studies remain important tools to assess nursery value of structured habitats and environmental factors, targeted applications that unify survey data over large spatial and temporal scales are vital to generalize inference of nursery function, identify highly productive regions, and inform management strategies. Using 21 years of spatio-temporally indexed survey data (i.e., water chemistry, turbidity, blue crab, and predator abundance) and GIS information on potential nursery habitats (i.e., seagrass, salt marsh, and unvegetated …
Differentiating The Effects Of Two Non-Native Fish In The Turnbull National Wildlife Refuge, Sarah Richardson
Differentiating The Effects Of Two Non-Native Fish In The Turnbull National Wildlife Refuge, Sarah Richardson
EWU Masters Thesis Collection
This study seeks to determine the individual effects of two non-native fish, the brook stickleback, Culaea inconstans, and pumpkinseed, Lepomis gibbosus, on the aquatic invertebrates and food webs of Turnbull National Wildlife Refuge (TNWR). Ten ponds were analyzed and compared with stable isotope analysis and invertebrate abundance data. Three ponds were chosen to represent each of the following categories: fishless, brook stickleback invaded (BS), and coinvaded, along with a single pumpkinseed (PS) pond. Overall, δ[superscript]13C and δ[superscript]15N values increased in invaded ponds, indicating shifts in the zooplankton community structure and the carbon source of predatory invertebrates. Mean δ[superscript]13C was the …
Quantifying Genomic Diversity And Growth In Iowa Bluegill, Jeremy Raymond Abels
Quantifying Genomic Diversity And Growth In Iowa Bluegill, Jeremy Raymond Abels
Dissertations and Theses @ UNI
Bluegill (Lepomis macrochirus) is one of the most fished species in Iowa. However, after an initial stocking event, lakes rarely receive additional stockings owing to a high rate of natural reproduction. For this reason, the genetic diversity of Bluegill populations remains understudied in the context of fisheries and natural resource management. Additionally, the extent to which genetics influences the growth rate of Bluegill on a population level has not yet been extensively examined. The goal of this study was to understand the diversity of Iowa’s Bluegill population and to determine if there is a genetic association with growth …
Ecological Risk Assessment For The Western Rock Lobster Resource : Workshop Procedure And Outcomes, R Stoklosa
Ecological Risk Assessment For The Western Rock Lobster Resource : Workshop Procedure And Outcomes, R Stoklosa
Fisheries occasional publications
No abstract provided.
Assessing The Trophic Positions Of Lake Michigan Fishes Using Stable Carbon And Nitrogen Isotopes, Benjamin Alan Turschak
Assessing The Trophic Positions Of Lake Michigan Fishes Using Stable Carbon And Nitrogen Isotopes, Benjamin Alan Turschak
Theses and Dissertations
Lake Michigan is the second largest Laurentian Great Lake and is characterized by broad spatiotemporal variation in ecosystem processes such as nutrient cycling and energy flow. Variation in ecosystem processes—such as those induced by invasive dreissenid mussels—and subsequent changes in the spatiotemporal distribution of resources (i.e. prey or habitat) has resulted in major changes in Lake Michigan’s fish community. The ability of fish species to cope with spatiotemporal resource dynamics is at least partially dependent on their ability to shift apparent trophic position along various resource gradients. The objectives of this research were to quantify trophic positions of Lake Michigan …
The Impacts Of Climate Change On The Gulf Of Maine Northern Shrimp (Pandalus Borealis) Distribution, Reproduction, And Life, Hsiao-Yun Chang
The Impacts Of Climate Change On The Gulf Of Maine Northern Shrimp (Pandalus Borealis) Distribution, Reproduction, And Life, Hsiao-Yun Chang
Electronic Theses and Dissertations
The Gulf of Maine northern shrimp (Pandalus borealis) once supported a significant winter fishery for the Gulf of Maine (GOM). Although the shrimp fishery is not comparable to the lobster business, it provided fishermen and many coastal communities jobs and incomes in winters after lobster seasons. However, a moratorium has been put on the shrimp fishery since 2014 due to record low population abundance and perceived recruitment failures. The recruitment failures have been correlated with warming water temperatures over the past decade. The GOM has been recognized as experiencing rapid warming as a result of global climate change. …
Checklist Of The Inland Fishes Of Louisiana, Michael H. Doosey, Henry L. Bart Jr., Kyle R. Piller
Checklist Of The Inland Fishes Of Louisiana, Michael H. Doosey, Henry L. Bart Jr., Kyle R. Piller
Southeastern Fishes Council Proceedings
Since the publication of Freshwater Fishes of Louisiana (Douglas, 1974) and a revised checklist (Douglas and Jordan, 2002), much has changed regarding knowledge of inland fishes in the state. An updated reference on Louisiana’s inland and coastal fishes is long overdue. Inland waters of Louisiana are home to at least 224 species (165 primarily freshwater, 28 primarily marine, and 31 euryhaline or diadromous) in 45 families. This checklist is based on a compilation of fish collections records in Louisiana from 19 data providers in the Fishnet2 network (www.fishnet2.net). The checklist has grown because of descriptions of three new species, new …
Ontogenetic Variation In Sciaenid Otolith Morphometry With Fish Size From The Northern Gulf Of Mexico, Thomas C. Ingalls
Ontogenetic Variation In Sciaenid Otolith Morphometry With Fish Size From The Northern Gulf Of Mexico, Thomas C. Ingalls
All HCAS Student Capstones, Theses, and Dissertations
Sciaenids are a diverse family of coastal fishes and their fisheries are an important industry in the United States. In the northern Gulf of Mexico this industry is dominated by six species, specifically, red drum (Sciaenops ocellatus), black drum (Pogonias cromis), spotted seatrout (Cynoscion nebulosus), sand seatrout (C. arenarius), Atlantic croaker (Micropogonias undulatus), and spot (Leiostomus xathurus). Sagittal otoliths of all species were evaluated for changes in size and shape in relation to changes in fish total length and age across a variety of seasons and habitats. Evaluation …
Environmental Controls On The Spatial Distribution Of Greenfin Darters And Biodiversity In The Blue Ridge Mountains, Dri Tattersfield
Environmental Controls On The Spatial Distribution Of Greenfin Darters And Biodiversity In The Blue Ridge Mountains, Dri Tattersfield
CMC Senior Theses
Disproportionate concentrations of biodiversity in mountains worldwide suggest linkages between geologic processes and biodiversity that are not yet well understood. The Tennessee River Basin in the Blue Ridge Mountains of the southeastern U.S. is a global hotspot for freshwater fish biodiversity. To investigate drivers of biodiversity in the Tennessee River Basin, and explore links to geologic processes, I study the Greenfin Darter (Nothonotus chlorobranchius), a small fish endemic to the upper Tennessee River Basin. I use generalized linear models (GLMs) to evaluate the influence of topography, lithology, climate and land use on the distribution of the Greenfin Darter, …
Algal Coverage Detection And Classification Using Envi: Correlation With Dissolved Oxygen Levels In Elkhorn Slough, Ca, Jason Dawson
Algal Coverage Detection And Classification Using Envi: Correlation With Dissolved Oxygen Levels In Elkhorn Slough, Ca, Jason Dawson
All HCAS Student Capstones, Theses, and Dissertations
Estuaries are exposed to varying stressors, whether they be physical, chemical, or environmental. The most notable of stressors is eutrophication of coastal and inland ecosystems. This is a result of increased supply of nutrients fueling production within the system. One outcome of this increased nutrient load to the system is that of algal blooms. These blooms can impact the aesthetic appearance and degrade the quality of health of the system. Many of these coastal zones and waterways are critical habitats for many biological (some endangered) species and serve as recreational areas for human populations. Elkhorn Slough, California is one of …
Weather And Exposure Period Affect Coyote Detection At Camera Traps, Anastasia E. Madsen, Lucia Corral Hurtado, Joseph J. Fontaine
Weather And Exposure Period Affect Coyote Detection At Camera Traps, Anastasia E. Madsen, Lucia Corral Hurtado, Joseph J. Fontaine
Nebraska Cooperative Fish and Wildlife Research Unit: Staff Publications
Abstract Camera traps are an increasingly popular means to monitor wildlife populations. However, like other techniques for measuring populations, camera traps are subject to sources of error that may bias population estimates. Past studies accounting for detection error have failed to account for a simple but potentially widely pervasive source of environmental error: weather conditions. Using 5,108,416 photographs from 804 scent‐lured camera traps deployed in western Nebraska, USA, during spring and autumn of 2014 and 2015, we analyzed the relationship between weather conditions (barometric pressure, wind speed, precipitation, and temperature) and coyote (Canis latrans) detection probability. Using binomial …
Diet Of A Recently Reintroduced River Otter (Lontra Canadensis) Population In Taos County, New Mexico, Gabriela Alexandra Wolf-Gonzalez
Diet Of A Recently Reintroduced River Otter (Lontra Canadensis) Population In Taos County, New Mexico, Gabriela Alexandra Wolf-Gonzalez
Theses and Dissertations--Forestry and Natural Resources
North American river otters (Lontra canadensis), native to every U.S. state and Canada, experienced extensive population decreases and range reduction until the mid-20th century as a result of overexploitation and habitat loss during European colonization. The last known river otter in New Mexico was killed on the Gila River in 1953, although unverified reports continued thru 2008. After a nearly 60-year absence from New Mexico, 33 adult river otters were reintroduced to the Rio Pueblo de Taos in the northern part of the state between 2008-2010; however, they were not subsequently monitored or studied. I characterized diet of …
Bridging Disciplines To Advance Elasmobranch Conservation: Applications Of Physiological Ecology, K Lyons, Js Bigman, Et Al, Kevin C. Weng, Et Al, Richard Brill, Cn Bedore
Bridging Disciplines To Advance Elasmobranch Conservation: Applications Of Physiological Ecology, K Lyons, Js Bigman, Et Al, Kevin C. Weng, Et Al, Richard Brill, Cn Bedore
VIMS Articles
A strength of physiological ecology is its incorporation of aspects of both species' ecology and physiology; this holistic approach is needed to address current and future anthropogenic stressors affecting elasmobranch fishes that range from overexploitation to the effects of climate change. For example, physiology is one of several key determinants of an organism's ecological niche (along with evolutionary constraints and ecological interactions). The fundamental role of physiology in niche determination led to the development of the field of physiological ecology. This approach considers physiological mechanisms in the context of the environment to understand mechanistic variations that beget ecological trends. Physiological …
The Physico-Chemical Environment And Aquatic Biodiversity Of Head Marala Wetland During 2000-2001, Zahid Bhatti, Muhammad Asif Gondal, Andleeb Batool
The Physico-Chemical Environment And Aquatic Biodiversity Of Head Marala Wetland During 2000-2001, Zahid Bhatti, Muhammad Asif Gondal, Andleeb Batool
Journal of Bioresource Management
An ecological study on Head Marala Wetland was undertaken. The study will help in providing sound basis for the future conservation activities and its management, on sounder footing. The Marala wetlands in Bajwat area included river Jammu Tawi, river Chanab and river Manawar Tawi were studied for a period of one year, i.e. from October, 2000 to September, 2001. In this study, 36 Phytoplanktons belonging to six families were observed. The other aquatic fauna observed included 14 species of fish, 2 turtles, one leech, one prawn, one shrimp and one bullfrog. The results showed that physico-chemical parameters had an impact …
Estimating The Use Of Public Lands: Integrated Modeling Of Open Populations With Convolution Likelihood Ecological Abundance Regression, Lutz F. Gruber, Erica F. Stuber, Joseph J. Fontaine
Estimating The Use Of Public Lands: Integrated Modeling Of Open Populations With Convolution Likelihood Ecological Abundance Regression, Lutz F. Gruber, Erica F. Stuber, Joseph J. Fontaine
Nebraska Cooperative Fish and Wildlife Research Unit: Staff Publications
We present an integrated open population model where the population dynamics are defined by a differential equation, and the related statistical model utilizes a Poisson binomial convolution likelihood. Key advantages of the proposed approach over existing open population models include the flexibility to predict related, but unobserved quantities such as total immigration or emigration over a specified time period, and more computationally efficient posterior simulation by elimination of the need to explicitly simulate latent immigration and emigration. The viability of the proposed method is shown in an in-depth analysis of outdoor recreation participation on public lands, where the surveyed populations …
Climate Change Enhances Disease Processes In Crustaceans: Case Studies In Lobsters, Crabs, And Shrimps, Jeffrey D. Shields
Climate Change Enhances Disease Processes In Crustaceans: Case Studies In Lobsters, Crabs, And Shrimps, Jeffrey D. Shields
VIMS Articles
Climate change has resulted in increasing temperature and acidification in marine systems. Rising temperature and acidification act as stressors that negatively affect host barriers to infection, thus enhancing disease processes and influencing the emergence of pathogens in ecologically and commercially important species. Given that crustaceans are ectotherms, changes in temperature dominate their physiological and immunological responses to microbial pathogens and parasites. Because of this, the thermal ranges of several crustacean hosts and their pathogens can be used to project the outcomes of infections. Host factors such as molting, maturation, respiration, and immune function are strongly influenced by temperature, which in …
Ribbeting Results: Emergent Infectious Diseases In Wetland Systems, Ariel Horner
Ribbeting Results: Emergent Infectious Diseases In Wetland Systems, Ariel Horner
Electronic Theses and Dissertations
North American amphibians have recently been impacted by two major emerging pathogens, the fungus Batrachochytrium dendrobatidis (Bd) and iridoviruses in the genus Ranavirus (Rv). Environmental, seasonal and host factors may play important roles in disease dynamics, but few studies incorporate these components into their analyses. Here, we investigated the role of environmental, seasonal, genetic and location effects on driving Bd and Rv infection prevalence and severity in a biodiversity hot spot, the southeastern United States. We used quantitative PCR to characterize Bd and Rv dynamics in natural populations of three amphibian species: Notophthalmus perstriatus, Hyla squirella and Pseudacris ornata and …
Checklist Of Zooplanktons In Different Rivers Of Bajwat Area, Zahid Bhatti, Muhammad Asif Gondal, Asad Ghufran, Andleeb Batool
Checklist Of Zooplanktons In Different Rivers Of Bajwat Area, Zahid Bhatti, Muhammad Asif Gondal, Asad Ghufran, Andleeb Batool
Journal of Bioresource Management
Zooplanktons are important fish and waterfowl food. Limnological studies of Marala Wetlands, a complex created by three rivers, i.e., Jammu Tawi, Chenab and Manawar Tawi, entering Bajwat area located 25 km from North of Sialkot city from state of Jammu and Kashmir, were carried out between October, 2000 to September 2001. This survey was carried out to create a checklist of zooplanktons existing in the study site which would help in future studies relating to aquatic biodiversity and ecological studies of wetlands. A minimum of 25 species of zooplanktons were present in the wetland area, which can be included into …
An Evaluation Of Sciaenid Growth In The Gulf Of Mexico, Shane Flinn
An Evaluation Of Sciaenid Growth In The Gulf Of Mexico, Shane Flinn
LSU Master's Theses
Growth models estimate life history parameters that are used in the management of fisheries stocks. The most commonly used growth model in fisheries is the von Bertalanffy growth model (VBGM), yet it has been shown to provide a poor fit for length-at-age data of some species and other models exist. I reviewed 196 peer-reviewed age and growth studies and 50 NOAA stock assessments to examine temporal trends in the use of growth models and model selection in fisheries. I found that the use of multi-model frameworks has increased since the year 2000 and information theoretic approaches are replacing goodness-of-fit and …
Spatial And Temporal Patterns Of Arctic Nearshore Fish Community And Food Web Structures, Mark B. Barton
Spatial And Temporal Patterns Of Arctic Nearshore Fish Community And Food Web Structures, Mark B. Barton
FIU Electronic Theses and Dissertations
Climate change and increasing anthropogenic activities are causing rapid changes to environmental and ecological processes in the Arctic Ocean. To better understand these changes, scientists have increased research efforts in these regions, but to date the number of studies on Arctic nearshore habitats are lacking. My dissertation responds to the paucity of information and investigates patterns in Arctic nearshore fish communities and food webs to gain insight to how these ecosystems may shift as these changes continue. I used multivariate statistical analysis to examine patterns in community structure and composition to determine that Arctic nearshore fish communities are largely driven …
Diversity Of Water Bugs In Gujranwala District, Punjab, Pakistan, Muhammad Shahbaz Chattha, Abu Ul Hassan Faiz, Arshad Javid, Irfan Baboo, Inayat Ullah Malik
Diversity Of Water Bugs In Gujranwala District, Punjab, Pakistan, Muhammad Shahbaz Chattha, Abu Ul Hassan Faiz, Arshad Javid, Irfan Baboo, Inayat Ullah Malik
Journal of Bioresource Management
Water bugs fall under the order Hemiptera, suborder Heteroptera, which is further divided into two types, i.e., semi-aquatic (Gerromorpha) and true water bugs (Nepomorpha). They play a vital role as biological control agents and also a source of food for fishes, birds and other aquatic organisms. The present work was carried out to ascertain aquatic Hemiptera in different lentic and lotic water bodies of various sizes in Gujranwala district, Pakistan. A total of 10 species belonging to five families were identified. Species include Nepa ruber Linnaeus, Laccotrephes elongatus Montandon, Ranatra filiformis Fabricius (Nepidae), Corixa substriata Uhler, Micronecta proba …
Lake Sturgeon (Acipenser Fulvescens) Trophic Position And Movement Patterns In The Lower Niagara River, Ny, Eric Bruestle
Lake Sturgeon (Acipenser Fulvescens) Trophic Position And Movement Patterns In The Lower Niagara River, Ny, Eric Bruestle
Great Lakes Center Masters Theses
Lake sturgeon Acipenser fulvescens were once widely distributed throughout the Laurentian Great Lakes. However, widespread overharvest and habitat degradation has diminished their numbers. The lower Niagara River, NY contains one of the few remaining recovering populations of lake sturgeon in New York State. The goal of this study was to characterize the trophic position of lake sturgeon in the context of an invasive species dominated food web and to describe their movement patterns and residency within the lower Niagara River. Stomach content analysis and stable nitrogen (δ15N) and carbon (δ13C) isotope analysis of tissue was used …
Reef Height Drives Threshold Dynamics Of Restored Oyster Reefs, Allison M. Colden, Robert J. Latour, Rom Lipcius
Reef Height Drives Threshold Dynamics Of Restored Oyster Reefs, Allison M. Colden, Robert J. Latour, Rom Lipcius
VIMS Articles
Nonlinear threshold responses to biotic or abiotic forcing may produce multiple population trajectories dependent upon initial conditions, which can reinforce population recovery or drive local ex - tinction, yet experimental tests of this phenomenon are lacking in marine ecosystems. In field experiments at 4 sites in 2 tributaries of lower Chesapeake Bay, we examined demographic responses (density and survival) of eastern oyster Crassostrea virginica populations to reef height and associated gradients in sediment deposition and habitat complexity. After 2 yr, oyster reefs exhibited diverging trajectories to ward either degradation or persistence, dependent upon initial reef height. Reefs higher than 0.3 …