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  • 2015-2019  (2,213)
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  • 11
    Publication Date: 2019-07-13
    Description: An inexpensive, laboratory-based, strain gauge valve gape monitor (SGM) was developed to monitor the valve gape behavior of bivalve molluscs in response to diel-cycling hypoxia. A Wheatstone bridge was connected to strain gauges that were attached to the shells of oysters (Crassostrea virginica). The recorded signals allowed for the opening and closing of the bivalves to be recorded continuously over two-day periods of experimentally-induced diel-cycling hypoxia and diel-cycling changes in pH. Here, we describe a protocol for developing an inexpensive strain gauge monitor and describe, in an example laboratory experiment, how we used it to measure the valve gape behavior of Eastern oysters (C. virginica), in response to diel-cycling hypoxia and cyclical changes in pH. Valve gape was measured on oysters subjected to cyclical severe hypoxic (0.6 mg/L) dissolved oxygen conditions with and without cyclical changes in pH, cyclical mild hypoxic (1.7 mg/L) conditions and normoxic (7.3 mg/L) conditions. We demonstrate that when oysters encounter repeated diel cycles, they rapidly close their shells in response to severe hypoxia and close with a time lag to mild hypoxia. When normoxia is restored, they rapidly open again. Oysters did not respond to cyclical pH conditions superimposed on diel cycling severe hypoxia. At reduced oxygen conditions, more than one third of the oysters closed simultaneously. We demonstrate that oysters respond to diel-cycling hypoxia, which must be considered when assessing the behavior of bivalves to dissolved oxygen. The valve SGM can be used to assess responses of bivalve molluscs to changes in dissolved oxygen or contaminants. Sealing techniques to better seal the valve gape strain gauges from sea water need further improvement to increase the longevity of the sensors.
    Keywords: Astrophysics
    Type: GSFC-E-DAA-TN54019 , Journal of Visualized Experiments (e-ISSN 1940-087X); 138
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  • 12
  • 13
    Publication Date: 2016-09-14
    Print ISSN: 0028-0836
    Electronic ISSN: 1476-4687
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Published by Springer Nature
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  • 14
    Publication Date: 2017-07-21
    Description: Reproducible climate reconstructions of the Common Era (1 CE to present) are key to placing industrial-era warming into the context of natural climatic variability. Here we present a community-sourced database of temperature-sensitive proxy records from the PAGES2k initiative. The database gathers 692 records from 648 locations, including all continental regions and major ocean basins. The records are from trees, ice, sediment, corals, speleothems, documentary evidence, and other archives. They range in length from 50 to 2000 years, with a median of 547 years, while temporal resolution ranges from biweekly to centennial. Nearly half of the proxy time series are significantly correlated with HadCRUT4.2 surface temperature over the period 1850–2014. Global temperature composites show a remarkable degree of coherence between high- and low-resolution archives, with broadly similar patterns across archive types, terrestrial versus marine locations, and screening criteria. The database is suited to investigations of global and regional temperature variability over the Common Era, and is shared in the Linked Paleo Data (LiPD) format, including serializations in Matlab, R and Python.
    Repository Name: EPIC Alfred Wegener Institut
    Type: Article , isiRev
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  • 15
    Publication Date: 2019-03-12
    Description: © The Authors, 2019. This is the author's version of the work and is distributed under the terms of the Creative Commons Attribution-Noncommercial-Share Alike 4.0 International License. The definitive version was published in Marine Pollution Bulletin, 140, (2019):364-373, doi:10.1016/j.marpolbul.2018.12.047.
    Description: Estuaries provide significant cultural ecosystem services, including recreation and tourism. Disruptions of estuarine biogeochemical processes resulting from environmental degradation could interrupt the flow of these services, reducing benefits and diminishing the welfare of local communities. This study focused on recreational shellfishing in Buzzards Bay, Massachusetts (41.55°N, 70.80°W). Relationships among measures of recreational shellfishing, estuarine water quality, and local socioeconomic conditions were tested to understand how the benefits of cultural ecosystem services to local communities might be affected by declining water quality. Transferring estimated economic benefits from an analysis of nearby municipalities, the study finds that increases in Chl a during the 24-year period were associated with losses in recreational shellfishing benefits of $0.08–0.67 million per decade. The approach presented here suggests a more broadly applicable framework for assessing the impacts of changes in coastal ecosystem water quality on the welfare of local communities.
    Description: We would like to thank the Buzzards Bay Coalition, the Buzzards Bay National Estuary Program, and the Massachusetts Department of Marine Fisheries for providing data for this analysis. We thank the 1074 citizen volunteers of the Buzzards Bay Coalition who collected the water quality samples and Mark Rasmussen for his leadership in sustaining the Baywatchers Program. Support for this analysis was provided by the John D. and Catherine T. MacArthur Foundation (Grant no. 14-106159-000-CFP), MIT Sea Grant (subaward number 5710004045), the Johnson Endowment of the WHOI Marine Policy Center, and SCD acknowledges support from the University of Virginia.
    Keywords: Estuarine water quality ; Eutrophication ; Recreational shellfishing ; Cultural ecosystem services ; Economic benefits transfer
    Repository Name: Woods Hole Open Access Server
    Type: Article
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  • 16
    Publication Date: 2022-05-25
    Description: © The Author(s), 2013. This article is distributed under the terms of the Creative Commons Attribution License. The definitive version was published in Journal of King Saud University - Science 25 (2013): 217–228, doi:10.1016/j.jksus.2013.02.006.
    Description: The degradation of natural fish habitat in the ocean implies lost economic benefits. These value losses often are not measured or anticipated fully, and therefore they are mainly ignored in decisions to develop the coast for industrial or residential purposes. In such circumstances, the ocean habitat and its associated ecosystem are treated as if they are worthless. Measures of actual or potential economic values generated by fisheries in commercial markets can be used to assess a conservative (lower-bound) value of ocean habitat. With this information, one can begin to compare the values of coastal developments to the values of foregone ocean habitat in order to help understand whether development would be justified economically. In this paper, we focus on the economic value associated with the harvesting of commercial fish stocks as a relevant case for the Saudi Arabian portion of the Red Sea. We describe first the conceptual basis behind supply-side approaches to economic valuation. Next we review the literature on the use of these methods for valuing ocean habitat. We provide an example based on recent research assessing the bioeconomic status of the traditional fisheries of the Red Sea in the Kingdom of Saudi Arabia (KSA). We estimate the economic value of ecosystem services provided by the KSA Red Sea coral reefs, finding that annual per-unit values supporting the traditional fisheries only are on the order of $7000/km2. Finally, we develop some recommendations for refining future applications of these methods to the Red Sea environment and for further research.
    Description: This research is based on work supported by Award Nos. USA 00002 and KSA 00011 made by the King Abdullah University of Science and Technology (KAUST).
    Keywords: Ecosystem service ; Supply-side valuation ; Traditional fishery ; Red Sea ; Coral reef ; Bio-economics
    Repository Name: Woods Hole Open Access Server
    Type: Article
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  • 17
    Publication Date: 2022-05-25
    Description: Presented at CERF 2015: Grand Challenges in Coastal & Estuarine Science, Portland, Oregon, November 8 - 12, 2015 and at the Eighth Symposium on Harmful Algae in the U.S., Long Beach, California, November 15 – 19, 2015
    Description: A growing concern for coastal management is the choice of appropriate public or private responses to HABs as a natural hazard. Considerable efforts have been devoted to understanding the scientific aspects of HABs, including their distributions in space and time, their ecological roles, and the nature of their toxic effects, among others. Much energy also has been directed at exploring socio-economic impacts and identifying potential management actions, including actions to prevent, control, or mitigate blooms. Using blooms of Florida red tide (Karenia brevis) as a case study, we develop an approach to the choice of policy responses to K. brevis blooms. Importantly, several new types of public health, environmental, and socio-economic impacts now are beginning to be revealed, including human gastrointestinal and potential neurological illnesses; morbidities and mortalities of protected species, including manatees, cetaceans, and sea turtles; increased numbers of hospital emergency room visits for the elderly; increased respiratory morbidities in workers, such as beach lifeguards; and potential reduced K- 12 school attendance. Optimal policy responses to this hazard are likely to depend critically upon why and where a bloom occurs, its spatial and temporal scales and toxicity, and the nature of its impacts. In the face of significant ongoing scientific uncertainties, and given estimates of impacts, we find that policies to expand and stabilize scientific research programs and environmental monitoring efforts, to develop and implement education programs for both residents and tourists, and to communicate the physical aspects of blooms to the public in a timely fashion are likely optimal.
    Description: This research was sponsored by the National Science Foundation under NSF/CNH Grant No. 1009106.
    Keywords: Coupled human-nature systems ; CHANS ; HAB ; Harmful algae bloom
    Repository Name: Woods Hole Open Access Server
    Type: Presentation
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  • 18
    Publication Date: 2022-05-25
    Description: Presented at the ICES Annual Science Conference, Gdańsk, Poland, 19–23 September 2011
    Description: Coastal and marine spatial planning (CMSP) is a process for improving the management of coastal and marine resources in order to promote their sustainable development. Sustainability necessitates that decisions be made about existing and future spatial and temporal distributions of human uses (and non‐uses) of the coastal and marine environment. Such decisions require methods for making tradeoffs. We present the outlines of an economic methodology based upon models of spatially distributed regional economic impacts to characterize the social welfare effects of tradeoffs among alternative CMSP policies. We show how a regional computable general equilibrium (CGE) model of the US northeast coastal economy could be used to assess changes in the spatial and temporal distribution of human uses and activities in the US Northeast Region. This work extends earlier efforts to develop a regional input‐ouput (IO) model of the Northeast Shelf LME and to link a regional IO model to linear models of a marine food web. The resulting CGE model could be used to analyze marginal changes in social welfare with respect to policy changes and to evaluate tradeoffs by estimating the socio‐economic net benefits of alternative scenarios. We present some examples of how the model could be used to simulate tradeoffs such as those involving the siting of ocean wind farms.
    Description: This work was supported by the Woods Hole Sea Grant Program (Award No. NA10OAR4170083); the MIT Sea Grant College Program (NOAA Award No. NA10OAR4170086, Subaward No. 5710002974); the National Science Foundation (NSF Award No. OCE‐1114142); and the Johnson Endowment of the WHOI Marine Policy Center.
    Keywords: Coastal and marine spatial planning ; Trade‐offs ; Regional economic model ; Northeast Shelf Large Marine Ecosystem (LME) ; Commercial fisheries ; Commercial fisheries
    Repository Name: Woods Hole Open Access Server
    Type: Presentation
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  • 19
    Publication Date: 2022-05-25
    Description: Author Posting. © The Author(s), 2017. This is the author's version of the work. It is posted here under a nonexclusive, irrevocable, paid-up, worldwide license granted to WHOI. It is made available for personal use, not for redistribution. The definitive version was published in Coastal Management 45 (2017): 360-383, doi:10.1080/08920753.2017.1345607.
    Description: Coastal barrier systems around the world are experiencing higher rates of flooding and shoreline erosion. Property owners on barriers have made significant financial investments in physical protections that shield their nearby properties from these hazards, constituting a type of adaptation to shoreline change. Factors that contribute to adaptation on Plum Island, a developed beach and dune system on the North Shore of Massachusetts, are investigated here. Plum Island experiences patterns of shoreline change that may be representative of many inlet-associated beaches, encompassing an equivocal and dynamically shifting mix of erosion and accretion. In the face of episodic floods and fleeting erosive events, and driven by a combination of strong northeast storms and cycles of erosion and accretion, the value of the average Plum Island residence increases by 34% for properties on the oceanfront where protection comprises a publicly constructed soft structure. Even in the face of state policies that ostensibly discourage physical protection as a means of adaptation, coastal communities face significant political and financial pressures to maintain existing protective structures or to allow contiguous groups of property owners to build new ones through collective action. These factors mitigate against adapting to shoreline change by retreating from the coast, thereby potentially increasing the adverse effects of coastal hazards.
    Description: Support for this study was provided by NSF Grant Nos. OCE 1325430 and AGS 1518503 and NOAA Cooperative Agreement No. NA14OAR4170074.
    Keywords: Adaptation ; Structural protection ; Coastal dune resource ; Tidal-associated inlet ; Hedonic pricing
    Repository Name: Woods Hole Open Access Server
    Type: Preprint
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  • 20
    Publication Date: 2022-05-25
    Description: Presented at the University of Connecticut at Avery Point, January 30, 2019, Groton, Connecticut
    Description: The mesopelagic, or the “ocean’s twilight zone” (OTZ), occurring at depths between 200-1000m, is renowned for its unusual life forms, including 13 species of bristlemouths, which are thought to be the most numerous vertebrates on earth. Irigoien et al. (2014) have raised the median estimates of OTZ fish biomass by an order of magnitude to ~11-16 Bt, although much uncertainty surrounds this estimate (7-214 Bt). OTZ fish help support stocks of apex predators, including marine mammals and commercially important fish and cephalopods, and some observers have suggested that they could constitute an enormous potential source of protein for human consumption per se. Diel vertical migrations of zooplankton, fish, squids, jellies, salps, and other organisms comprise a “biological carbon pump” that may facilitate the very long-term sequestration of carbon in deep waters or on the seabed. The net amounts of carbon sequestered in the ocean are also highly uncertain, with estimates ranging between 4-12 Bt annually. The OTZ can be conceptualized as a stock of differentiated natural capital, subject to capital gains or losses, that may yield flows of benefits, termed “ecosystem services.” Here, approaches developed through the Millennium Ecosystem Assessment are utilized as an organizing framework for beginning to assess and evaluate OTZ ecosystem services. Understanding the benefits associated with these services is central to gauging the opportunity costs of activities that might diminish those benefits, such as unregulated fishery exploitation or the effects associated with climate changes in the ocean, including warming, acidification, decreased dissolved oxygen levels, or shifts in biological diversity. Such an understanding is foundational for conserving the OTZ in a sustainable way. The potential relevance of OTZ scientific research to contemporary developments in the international law of the high seas is discussed as well.
    Repository Name: Woods Hole Open Access Server
    Type: Presentation
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