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Articles 61 - 90 of 173
Full-Text Articles in Marine Biology
Town Of Hampton Stormwater Management Prep Natural Resources Outreach Coalition Grant Final Project Report, Town Of Hampton, New Hampshire, Natural Resources Outreach Coalition
Town Of Hampton Stormwater Management Prep Natural Resources Outreach Coalition Grant Final Project Report, Town Of Hampton, New Hampshire, Natural Resources Outreach Coalition
PREP Reports & Publications
PREP provided $3,500 towards the project which was matched by municipal funds to pay for consulting advice on improving the regulations. The Planning Board provided exceptional in-kind match on the project, with many hours of work spent by a volunteer engineer serving on the Board. On February 12th 2009, Hampton’s Innovative Land Use Team, in coordination with NROC, hosted a community workshop on stormwater issues that was well attended by municipal officials, town staff, and members of the public. After many revisions, the Planning Board formally adopted the approved stormwater management provisions into the town site plan and subdivision regulations …
A Comparison Of Copepoda (Order: Calanoida, Cyclopoida, Poecilostomatoida) Density In The Florida Current Off Fort Lauderdale, Florida, Jessica L. Bostock
A Comparison Of Copepoda (Order: Calanoida, Cyclopoida, Poecilostomatoida) Density In The Florida Current Off Fort Lauderdale, Florida, Jessica L. Bostock
HCNSO Student Theses and Dissertations
Copepods, minute crustaceans, are vital constituents of marine food web dynamics in tropical ecosystems. Ecologically, copepods provide the link between primary production and tertiary consumers. Changes in population structure and densities may impact ecosystem stability and production on small to large spatial scales. The present study examined the influence of the Florida Current on copepod population densities off the coast of Fort Lauderdale, Florida due to limited data in the area. Samples were collected during February and July 2007 at two locations, Stations A and B. Station A, dependent on current dynamics, fluctuated between the most western boundary and the …
The Land Conservation Plan For Maine’S Piscataqua Region Watersheds, Steve Walker, Tin Smith, Paul Schumacher, Jason Czapiga, Derek Sowers, Jamie Oman-Saltmarsh, Paul Dest
The Land Conservation Plan For Maine’S Piscataqua Region Watersheds, Steve Walker, Tin Smith, Paul Schumacher, Jason Czapiga, Derek Sowers, Jamie Oman-Saltmarsh, Paul Dest
PREP Reports & Publications
The Piscataqua River/Great Bay estuary is a shared coastal embayment that forms the southernmost boundary between the states of Maine and New Hampshire. This rich coastal bay provides critical ecological, economic, and social benefits to the southern Maine and coastal New Hampshire region. The Great Bay estuary is such an important coastal resource that it is officially recognized as a coastal area of national significance by both the federal National Estuary Program and the federal National Estuarine Research Reserve program. The Piscataqua River/Great Bay estuary is fed by many rivers in New Hampshire, and by the Salmon Falls River, Great …
Behavior And Physiology Of Hermit Crabs During Burial: Shell Abandonment And Lactate Accumulation, Janelle Allison Shives
Behavior And Physiology Of Hermit Crabs During Burial: Shell Abandonment And Lactate Accumulation, Janelle Allison Shives
Loma Linda University Electronic Theses, Dissertations & Projects
Organisms living in the intertidal zone must adapt to environmental and physical stressors. One physical stressor that these organisms may face, and that may require specific behavioral and physiological responses, is burial by sediment. In this thesis I report the results of experiments in which I subjected the intertidal hermit crab, Pagurus samuelis, to burial and analyzed aspects of subsequent behavior and physiology. In the first set of experiments, hermit crabs were buried with the shell aperture facing either up or down, and at one of three depths (2, 4, or 6 cm). The factors hermit crab weight, shell …
A Sea Change For Aquatic Sustainability : Meeting The Challenge Of Fish Resources Management And Aquatic Sustainability In The 21st Century, Department Of Fisheries
A Sea Change For Aquatic Sustainability : Meeting The Challenge Of Fish Resources Management And Aquatic Sustainability In The 21st Century, Department Of Fisheries
Fisheries Occasional Publications
No abstract provided.
River Road New Castle Marsh Restoration Recommendations, Rockingham County Conservation District
River Road New Castle Marsh Restoration Recommendations, Rockingham County Conservation District
PREP Reports & Publications
PREP’s 2009 (YR 13) workplan allocated $30,000 of EPA 320 funds for restoration project funding (Workplan ID 09-D-2). $9,500 of this allocation went to the Rockingham County Conservation District (RCCD) to fund planning work on two separate salt marsh restoration projects: 1. Stuart Farm (Stratham, NH) 2. River Road Marsh (New Castle, NH)
Hydrodynamic Fin Function Of Brief Squid, Lolliguncula Brevis, William J. Stewart, Ian K. Bartol, Paul S. Krueger
Hydrodynamic Fin Function Of Brief Squid, Lolliguncula Brevis, William J. Stewart, Ian K. Bartol, Paul S. Krueger
Biological Sciences Faculty Publications
Although the pulsed jet is often considered the foundation of a squid's locomotive system, the lateral fins also probably play an important role in swimming, potentially providing thrust, lift and dynamic stability as needed. Fin morphology and movement vary greatly among squid species, but the locomotive role of the fins is not well understood. To begin to elucidate the locomotive role of the fins in squids, fin hydrodynamics were studied in the brief squid Lolliguncula brevis, a species that exhibits a wide range of fin movements depending on swimming speed. Individual squid were trained to swim in both the …
Evaluating Ecosystem Response To Oyster Restoration And Nutrient Load Reduction With A Multispecies Bioenergetics Model, Richard S. Fulford, Denise L. Breitburg, Mark Luckenbach, Roger I.E. Newell
Evaluating Ecosystem Response To Oyster Restoration And Nutrient Load Reduction With A Multispecies Bioenergetics Model, Richard S. Fulford, Denise L. Breitburg, Mark Luckenbach, Roger I.E. Newell
Faculty Publications
Many of the world's coastal ecosystems are impacted by multiple stressors each of which may be subject to different management strategies that may have overlapping or even conflicting objectives. Consequently, management results may be indirect and difficult to predict or observe. We developed a network simulation model intended specifically to examine ecosystem-level responses to management and applied this model to a comparison of nutrient load reduction and restoration of highly reduced stocks of bivalve suspension feeders (eastern oyster, Crassostrea virginica) in an estuarine ecosystem (Chesapeake Bay, USA). Model results suggest that a 50% reduction in nutrient inputs from the watershed …
Upper Ocean Response To The Atmospheric Cold Pools Associated With The Madden-Julian Oscillation, Suyang Pei, Toshiaki Shinoda, Alexander Soloviev, Ren-Chieh Lien
Upper Ocean Response To The Atmospheric Cold Pools Associated With The Madden-Julian Oscillation, Suyang Pei, Toshiaki Shinoda, Alexander Soloviev, Ren-Chieh Lien
Marine & Environmental Sciences Faculty Articles
Atmospheric cold pools are frequently observed during the Madden‐Julian Oscillation events and play an important role in the development and organization of large‐scale convection. They are generally associated with heavy precipitation and strong winds, inducing large air‐sea fluxes and significant sea surface temperature (SST) fluctuations. This study provides a first detailed investigation of the upper ocean response to the strong cold pools associated with the Madden‐Julian Oscillation, based on the analysis of in situ data collected during the Dynamics of the Madden‐Julian Oscillation (DYNAMO) field campaign and one‐dimensional ocean model simulations validated by the data. During strong cold pools, SST …
Changing Patterns Of Microhabitat Utilization By The Threespot Damselfish, Stegastes Planifrons, On Caribbean Reefs, William F. Precht, Richard B. Aronson, Ryan M. Moody, Les M. Kaufman
Changing Patterns Of Microhabitat Utilization By The Threespot Damselfish, Stegastes Planifrons, On Caribbean Reefs, William F. Precht, Richard B. Aronson, Ryan M. Moody, Les M. Kaufman
Ocean Engineering and Marine Sciences Faculty Publications
The threespot damselfish, Stegastes planifrons (Cuvier), is important in mediating interactions among corals, algae, and herbivores on Caribbean coral reefs. The preferred microhabitat of S. planifrons is thickets of the branching staghorn coral Acropora cervicornis. Within the past few decades, mass mortality of A. cervicornis from white-band disease and other factors has rendered this coral a minor ecological component throughout most of its range. Methodology/Principal Findings:Survey data from Jamaica (heavily fished), Florida and the Bahamas (moderately fished), the Cayman Islands (lightly to moderately fished), and Belize (lightly fished) indicate that distributional patterns of S. planifrons are positively correlated with live …
On The Recurrent Ulva Prolifera Blooms In The Yellow Sea And East China Sea, Chuanmin Hu, Daqiu Li, Changsheng Chen, Jianzhong Ge, Frank E. Muller-Karger, Junpeng Liu, Feng Yu, Ming-Xia He
On The Recurrent Ulva Prolifera Blooms In The Yellow Sea And East China Sea, Chuanmin Hu, Daqiu Li, Changsheng Chen, Jianzhong Ge, Frank E. Muller-Karger, Junpeng Liu, Feng Yu, Ming-Xia He
Marine Science Faculty Publications
A massive bloom of the green macroalgae Ulva prolifera (previously known as Enteromorpha prolifera) occurred in June 2008 in the Yellow Sea (YS), resulting in perhaps the largest “green tide” event in history. Using a novel index (Floating Algae Index) and multiresolution remote sensing data from MODIS and Landsat, we show that U. prolifera patches appeared nearly every year between April and July 2000–2009 in the YS and/or East China Sea (ECS), which all originated from the nearshore Subei Bank. A finite volume numerical circulation model, driven by realistic forcing and boundary conditions, confirmed this finding. Analysis of meteorological/environmental …
Shoreland Protection In Maine Communities Of The Piscataqua River Estuary, Southern Maine Regional Planning Commission
Shoreland Protection In Maine Communities Of The Piscataqua River Estuary, Southern Maine Regional Planning Commission
PREP Reports & Publications
The Management Plan for the Piscataqua Rive r Estuary Program’s (PREP) includes several action plans to improve municipal regulatory protections for stream and wetland buffers. This project objective was to identify and prioritize appropriate shoreland areas for protection within Maine towns that are within the PREP region, and inform municipalities and land trusts about these areas, and the importance for protecting them.
Development Of Representative Species-Level Molecular Markers And Morphological Character Analysis Of Leucothoid Amphipods (Crustacea: Amphipoda), Kristine Nicolle White
Development Of Representative Species-Level Molecular Markers And Morphological Character Analysis Of Leucothoid Amphipods (Crustacea: Amphipoda), Kristine Nicolle White
Dissertations
Leucothoid amphipods were investigated using morphology and molecular rDNA gene sequence fragments. The morphological diagnostic characters for traditional taxonomy have been clarified, a molecular marker for representative species has been developed, and one of the current anamorph-leucomorph connections has been confirmed with molecular sequence data. Ultimately this study has combined traditional morphological and modern molecular methods to clarify the taxonomy and to propose a preliminary phylogeny of the Leucothoidae. Analysis of 18S rDNA gene fragments from 13 species in two genera supported the current morphological species designations and the separation of the family into two clades. Combined analysis of 18S …
Systematic Revision Of The Kalliapseudidae (Crustacea: Peracarida: Tanaidacea) And The Population Genetic Structure And Phylogeography Of A Species Along The Southeastern And Gulf Coasts Of North America, David Thomas Drumm
Dissertations
The Kalliapseudidae is a family of shallow burrow-dwelling marine and estuarine tanaidaceans. There are currently 39 known species of 12 genera and three subfamilies. They are primarily circumtropical in distribution; however, several species are found in temperate waters. The phylogeny of Kalliapseudidae is assessed to test the monophyly of currently accepted subfamilies and genera, based largely on examination of material loaned from various museums and institutions. Multiple exemplars from other apseudomorph families were also included in the ingroup to test the monophyly of the family. Parsimony analyses included 41 terminal taxa and 64 binary and multistate morphological characters. Analyses based …
Implementation Of The Great Works River Non-Point Source Pollution Watershed Management Plan, Tin Smith
Implementation Of The Great Works River Non-Point Source Pollution Watershed Management Plan, Tin Smith
PREP Reports & Publications
This project was a collaboration between the Wells National Estuarine Research Reserve, Great Works Regional Land Trust, and the Great Works River Watershed Coalition to implement five of the “Highest Priority” tasks from the Action Plan of the Great Works River Nonpoint Source Pollution Watershed Management Plan (2007). The Great Works River drains 6 towns in southwest coastal Maine flowing into the estuary portion of the Salmon Falls and Piscataqua Rivers. The project included involving a steering committee of stakeholders, a buffer outreach effort, updating water quality data, invasive species education, improving access to information, and developing a plan for …
Town Of Brentwood Stormwater Management Project, Vanasse Hangen & Brustlin
Town Of Brentwood Stormwater Management Project, Vanasse Hangen & Brustlin
PREP Reports & Publications
Vanasse Hangen & Brustlin (VHB) worked with the Brentwood Planning Board to develop and adopt a stormwater management ordinance intended to improve development practices primarily for commercial sites and new subdivisions.
Relationships Between Particle Properties And Scattering In Coastal Waters Of The Northern Gulf Of Mexico Influenced By The Mississippi River, Bruce Alan Spiering
Relationships Between Particle Properties And Scattering In Coastal Waters Of The Northern Gulf Of Mexico Influenced By The Mississippi River, Bruce Alan Spiering
Dissertations
This study was conducted to determine how the characteristics of an assemblage of suspended particles, including their composition and size affect the relationship between the optical scattering coefficient b (m-1), and the dry mass of the particles in suspension. Knowledge of the scattering to total suspended matter (TSM) ratio, i.e. the mass specific scattering coefficient b* (m2/g), is important because the light detected by optical imaging sensors used for remote sensing is the light that has been scattered by particles back through the water surface. If this ratio is not known or varies within the region of interest, accurate estimates …
Transplantation And Parrotfish Predation: A Study On Small Siderastrea Siderea Colonies Offshore Broward County, Fl Usa, Allison S. Brownlee
Transplantation And Parrotfish Predation: A Study On Small Siderastrea Siderea Colonies Offshore Broward County, Fl Usa, Allison S. Brownlee
HCNSO Student Theses and Dissertations
With increasing coastal development along southeastern Florida, nearshore coral reef communities are at an increased risk from anthropogenic impacts. Impact minimization and mitigation efforts associated with permitted coastal construction activities generally exclude nearshore small (< 10 cm diameter) Siderastrea siderea colonies from required coral transplantation due to an assumed high colony mortality associated with transplanting small stony corals. This study evaluated the efficacy of transplanting these small colonies by monitoring survival, growth, and zooxanthellae density post transplantation to an offshore reef area. Unexpected observations of parrotfish predation on the newly transplanted corals were made within the first 24 hours. Within 2 weeks, 94% …
Stonehouse Pond Conservation, Gregg Caporossi
Stonehouse Pond Conservation, Gregg Caporossi
PREP Reports & Publications
The Trust for Public Land (TPL) is partnering with New Hampshire Fish and Game, the Town of Barrington, and Strafford Rivers Conservancy to complete the Stonehouse Pond Conservation Project - a collaborative effort to protect 241 forested acres surrounding Stonehouse Pond in New Hampshire's fast growing coastal region. The property, located within a 4,200-acre block of unfragmented forest, has been recognized as a conservation priority in the NH Wildlife Action Plan and the Land Conservation Plan for the NH's Coastal Watersheds, and is part of TPL's broader Coastal Conservation Initiative. TPL has secured an option to purchase the properties …
Zooplankton Population Dynamics In The Upper Mississippi River-Lake System, Krystal Michaels
Zooplankton Population Dynamics In The Upper Mississippi River-Lake System, Krystal Michaels
Honors Capstones
Capstone submitted as a graduation requirement for the BSU Honors Program.
The Loss Of Species: Mangrove Extinction Risk And Geographic Areas Of Global Concern, Beth A. Polidoro, Kent E. Carpenter, Lorna Collins, Norman C. Duke, Aaron M. Ellison, Joanna C. Ellison, Elizabeth J. Farnsworth, Edwino S. Fernando, Kandasamy Kathiresan, Nico E. Koedam, Suzanne R. Livingstone, Toyohiko Miyagi, Gregg E. Moore, Vien Ngoc Nam, Jin Eong Ong, Jurgenne H. Primavera, Serverino G. Salmo, Jonnell C. Sanciango, Sukristijono Sukardjo, Yamin Wang, Jean Wan Hong Yong
The Loss Of Species: Mangrove Extinction Risk And Geographic Areas Of Global Concern, Beth A. Polidoro, Kent E. Carpenter, Lorna Collins, Norman C. Duke, Aaron M. Ellison, Joanna C. Ellison, Elizabeth J. Farnsworth, Edwino S. Fernando, Kandasamy Kathiresan, Nico E. Koedam, Suzanne R. Livingstone, Toyohiko Miyagi, Gregg E. Moore, Vien Ngoc Nam, Jin Eong Ong, Jurgenne H. Primavera, Serverino G. Salmo, Jonnell C. Sanciango, Sukristijono Sukardjo, Yamin Wang, Jean Wan Hong Yong
Biological Sciences Faculty Publications
Mangrove species are uniquely adapted to tropical and subtropical coasts, and although relatively low in number of species, mangrove forests provide at least US $1.6 billion each year in ecosystem services and support coastal livelihoods worldwide. Globally, mangrove areas are declining rapidly as they are cleared for coastal development and aquaculture and logged for timber and fuel production. Little is known about the effects of mangrove area loss on individual mangrove species and local or regional populations. To address this gap, species-specific information on global distribution, population status, life history traits, and major threats were compiled for each of the …
Stewardship Plan For Garrity Reserve, Lee, Nh, Ellen Snyder
Stewardship Plan For Garrity Reserve, Lee, Nh, Ellen Snyder
PREP Reports & Publications
The 16.02-acre Garrity Reserve lies on the west side of Garrity Road in the northeast region of the Town of Lee, New Hampshire (Map 1). The Garrity Reserve is identified on the Lee Tax Map as Map 9 Lots 3- 0 and 3-1 (Appendix A). The parcel has just over 790-feet of frontage on Garrity Road. There is no parking on the property; visitors park on the opposite side of Garrity Road, alongside the Gluke cemetery. The property is bordered by a residential subdivision to the west and rural residences to the north and south. A large portion of the …
Investigations Into The Application Of Single-Beam Acoustic Backscatter For Describing Shallow Water Marine Habitats, Greg Foster
Investigations Into The Application Of Single-Beam Acoustic Backscatter For Describing Shallow Water Marine Habitats, Greg Foster
HCNSO Student Theses and Dissertations
Chapter 1
Producing thematic coral reef benthic habitat maps from single-beam acoustic backscatter has been hindered by uncertainties in interpreting the acoustic energy parameters E1 (~roughness) and E2 (~hardness), typically limiting such maps to sediment classification schemes. In this study acoustic interpretation was guided by high-resolution LIDAR (Light Detection And Ranging) bathymetry. Each acoustic record, acquired from a BioSonics DT-X echosounder and multiplexed 38 and 418 kHz transducers, was paired with a spatially-coincident value of a LIDAR-derived proxy for topographic complexity (Reef-Volume) and its membership to one of eight LIDAR-delineated benthic habitat classes. The discriminatory capabilities of the 38 and …
Moderate Resolution Imaging Spectroradiometer (Modis) Observations Of Cyanobacteria Blooms In Taihu Lake, China, Chuanmin Hu, Zhongping Lee, Ronghua Ma, Kun Yu, Daqiu Li, Shaoling Shang
Moderate Resolution Imaging Spectroradiometer (Modis) Observations Of Cyanobacteria Blooms In Taihu Lake, China, Chuanmin Hu, Zhongping Lee, Ronghua Ma, Kun Yu, Daqiu Li, Shaoling Shang
Marine Science Faculty Publications
A novel approach was used with data from the Moderate Resolution Imaging Spectroradiometer (MODIS) to characterize the intense blooms of cyanobacteria (primarily Microcystis aeruginosa) in Taihu Lake, China's third largest freshwater lake. The approach involves first deriving a floating algae index (FAI) based on the medium‐resolution (250 and 500 m) MODIS reflectance data at 645, 859, and 1240 nm after correction of the ozone/gaseous absorption and Rayleigh scattering effects and then objectively determining the FAI threshold value (−0.004) to separate the bloom and nonbloom waters. By definition, the term “bloom” or “floating algae” refers to bloom where cyanobacteria form …
A Test Of The Area Of Refuge Hypothesis In Indo-Pacific Marine Biogeography, Jonnell C. Sanciangco
A Test Of The Area Of Refuge Hypothesis In Indo-Pacific Marine Biogeography, Jonnell C. Sanciangco
Biological Sciences Theses & Dissertations
Many hypotheses have been proposed to explain the marine biogeographic patterns of species richness of the Indo-Pacific. One of these hypotheses suggests that available habitat area is the main predictor of species richness. This is the basis for the area of refuge hypothesis that attempts to explain the global maxima of species richness found in the Coral Triangle, the area encompassing mostly the Philippines, Indonesia, and Malaysia. This species-area effect also has habitat heterogeneity as a potential component. The purpose of this study is to test the effects of habitat availability predictors, such as shallow water area and coastline length …
Stewardship Plan For The 5 Corners Reserve, Lee, Nh, Ellen Snyder
Stewardship Plan For The 5 Corners Reserve, Lee, Nh, Ellen Snyder
PREP Reports & Publications
The 20.7–acre Lee Five Corners Reserve (Reserve) is located north of Route 4 and west of Snell Road in the northern “Five Corners” region of Lee, New Hampshire. The property is accessed at the end of Old Concord Turnpike, which leads northwest from Snell Road near the intersection of Route 155 (Map 1). The gravel access road continues through the Five Corners Reserve and onto a Town of Durham parcel that houses a public drinking water well. An iron gate that blocks public access to the Durham well site is located on the Five Corners Reserve. A small parking area …
The Ontogeny Of Muscle Structure And Locomotory Function In The Long-Finned Squid Doryteuthis Pealeii, J. T. Thompson, I. K. Bartol, A. E. Baksi, P. S. Krueger
The Ontogeny Of Muscle Structure And Locomotory Function In The Long-Finned Squid Doryteuthis Pealeii, J. T. Thompson, I. K. Bartol, A. E. Baksi, P. S. Krueger
Biological Sciences Faculty Publications
Understanding the extent to which changes in muscle form and function underlie ontogenetic changes in locomotory behaviors and performance is important in understanding the evolution of musculoskeletal systems and also the ecology of different life stages. We explored ontogenetic changes in the structure, myosin heavy chain (MHC) expression and contractile properties of the circular muscles that provide power for jet locomotion in the long-finned squid Doryteuthis pealeii. The circular muscle fibers of newly hatched paralarvae had different sizes, shapes, thick filament lengths, thin: thick filament ratio, myofilament organization and sarcoplasmic reticulum (SR) distribution than those of adults. Viewed in …
Review Of Erosion And Sedimentation Control Programs In The Piscataqua Region, Piscataqua Region Estuaries Partnership, Ken Hickey, Cayce Dalton, Jeff Clifford
Review Of Erosion And Sedimentation Control Programs In The Piscataqua Region, Piscataqua Region Estuaries Partnership, Ken Hickey, Cayce Dalton, Jeff Clifford
PREP Reports & Publications
The Piscataqua Region Estuaries Partnership (PREP) seeks to minimize adverse impacts to water resources associated with construction site development activities. In order to achieve this goal, PREP must understand the strengths and weaknesses of existing erosion and sedimentation control (E&SC) programs in the 52 municipalities of the PREP water shed (Figure 1-1). A detailed understanding of the existing E&SC programs will enable PREP and other stakeholders to identify and implement actions to improve E&SC programs and minimize adverse impacts. This report provides a review and assessment of existing erosion and sedimentation control programs and a set of recommendations for improving …
Diversity Partitioning Of Stony Corals Across Multiple Spatial Scales Around Zanzibar Island, Tanzania, Robert Van Woesik, Assaf Zvuloni, Yossi Loya
Diversity Partitioning Of Stony Corals Across Multiple Spatial Scales Around Zanzibar Island, Tanzania, Robert Van Woesik, Assaf Zvuloni, Yossi Loya
Ocean Engineering and Marine Sciences Faculty Publications
The coral reefs of Zanzibar Island (Unguja, Tanzania) encompass a considerable proportion of the global coralreef diversity and are representative of the western Indian Ocean region. Unfortunately, these reefs have been recently subjected to local and regional disturbances. The objectives of this study were to determine whether there are potentially non-random processes forcing the observed coral diversity patterns, and highlight where and at which spatial scales these processes might be most influential. Methodology/Principal Findings: A hierarchical (nested) sampling design was employed across three spatial scales, ranging from transects (≤20 m), stations (<100 m), to sites (<1000 m), to examine coral diversity patterns. Two of the four sites, Chumbe and Mnemba, were located within Marine Protected Areas (MPAs), while the other two sites, Changuu and Bawe, were not protected. Additive partitioning of coral diversity was used to separate regional (total) diversity (γ) into local a diversity and among-sample β diversity components. Individual-based null models were used to identify deviations from random distribution across the three spatial scales. We found that Chumbe and Mnemba had similar diversity components to those predicted by the null models. However, the diversity at Changuu and Bawe was lower than expected at all three spatial scales tested. Consequently, the relative contribution of the among-site diversity component was significantly greater than expected. Applying partitioning analysis for each site separately revealed that the within-transect diversity component in Changuu was significantly lower than the null expectation. Conclusions/Significance: The non-random outcome of the partitioning analyses helped to identify the among-sites scale (i.e., 10's of kilometers) and the within-transects scale (i.e., a few meters; especially at Changuu) as spatial boundaries within which to examine the processes that may interact and disproportionately differentiate coral diversity. In light of coral community compositions and diversity patterns we strongly recommend that Bawe be declared a MPA.
Processes Influencing Seasonal Hypoxia In The Northern California Current System, Thomas Connolly, Barbara Hickey, S. Geier, William Cochlan
Processes Influencing Seasonal Hypoxia In The Northern California Current System, Thomas Connolly, Barbara Hickey, S. Geier, William Cochlan
Faculty Publications
This paper delineates the role of physical and biological processes contributing to hypoxia, dissolved oxygen (DO) < 1.4 mL/L, over the continental shelf of Washington State in the northern portion of the California Current System. In the historical record (1950–1986), during the summer upwelling season, hypoxia is more prevalent and severe off Washington than further south off northern Oregon. Recent data (2003–2005) show that hypoxia over the Washington shelf occurred at levels previously observed in the historical data. The year 2006 was an exception, with hypoxia covering ∼5000 km2 of the Washington continental shelf and DO concentrations below 0.5 mL/L at the inner shelf, lower than any known previous observations at that location. In the 4 years studied, upwelling of low DO water and changes in source water contribute to interannual variability, but cannot account for seasonal decreases below hypoxic concentrations. Deficits of DO along salinity surfaces, indicating biochemical consumption of DO, vary significantly between surveys, accounting for additional decreases of 0.5–2.5 mL/L by late summer. DO consumption is associated with denitrification, an indicator of biochemical sediment processes. Mass balances of DO and nitrate show that biochemical processes in the water column and sediments each contribute ∼50% to the total consumption of DO in near-bottom water. At shorter than seasonal time scales on the inner shelf, along-shelf advection of hypoxic patches and cross-shelf advection of seasonal gradients are both shown to be important, changing DO concentrations by 1.5 mL/L or more over 5 days.