Changes in Community Structure and Biomass of Seagrass Communities along Gradients of Siltation in SE Asia

Terrados, Jorge; Duarte, Carlos M.; Fortes, Miguel D.; Borum, Jens; Agawin, Nona S. R.; Bach, Steffen; Thampanya, Udomluck; Kamp‐Nielsen, Lars; Kenworthy, W. J.; Geertz‐Hansen, Ole; Vermaat, Jan E.

doi:10.1006/ecss.1997.0304

Cited by 172 publications

(107 citation statements)

References 26 publications

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“…The scale is consistent with the widely used quartile scale of Gomez et al (2004 (Björk et al 2008;Terrados 1998Terrados , 1999. Thus, the more species, the less sensitive the community is to disturbances Seagrass meadow with high species diversity is also an indication of the number of zones that a meadow has thereby the extent of the remaining meadow…”

Section: Assessing Exposure In I-c-sea Changesupporting

confidence: 71%

I-C-SEA Change: A participatory tool for rapid assessment of vulnerability of tropical coastal communities to climate change impacts

Licuanan

Samson

Mamauag³

et al. 2015

Ambio

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We present a synoptic, participatory vulnerability assessment tool to help identify the likely impacts of climate change and human activity in coastal areas and begin discussions among stakeholders on the coping and adaptation measures necessary to minimize these impacts. Vulnerability assessment tools are most needed in the tropical Indo-Pacific, where burgeoning populations and inequitable economic growth place even greater burdens on natural resources and support ecosystems. The Integrated Coastal Sensitivity, Exposure, and Adaptive Capacity for Climate Change (I-C-SEA Change) tool is built around a series of scoring rubrics to guide non-specialists in assigning scores to the sensitivity and adaptive capacity components of vulnerability, particularly for coral reef, seagrass, and mangrove habitats, along with fisheries and coastal integrity. These scores are then weighed against threat or exposure to climate-related impacts such as marine flooding and erosion. The tool provides opportunities for learning by engaging more stakeholders in participatory planning and group decision-making. It also allows for information to be collated and processed during a ''town-hall'' meeting, facilitating further discussion, data validation, and even interactive scenario building.

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Section: Assessing Exposure In I-c-sea Changesupporting

confidence: 71%

I-C-SEA Change: A participatory tool for rapid assessment of vulnerability of tropical coastal communities to climate change impacts

Licuanan

Samson

Mamauag³

et al. 2015

Ambio

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“…This may be caused by competition for light and nutrients as well as reduced gas exchange, all factors that can be ex acerbated by reductions in flow caused by the additional habitat structure of macroalgae (Nelson & Lee 2001). Additional negative effects may occur via unfavorable biogeochemical conditions imposed on belowground eelgrass structures, such as anoxia (Pregnall et al 1984), high sulfide concentrations, and other redox changes resulting from low oxygen (Terrados et al 1998), toxic ammonium concentrations (van Katwijk et al 1997), and physical damage (Valdemarsen et al 2010). These effects are likely to be more severe for newly recruiting than for established shoots (van Katwijk et al 1997).…”

Section: Mechanismsmentioning

confidence: 99%

Multi-year study of the effects of Ulva sp. blooms on eelgrass Zostera marina

Olyarnik

Stachowicz²

2012

Mar. Ecol. Prog. Ser.

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Macroalgal blooms have contributed to declines in foundation species such as corals and seagrasses across the globe. Most studies of macroalgal bloom effects on seagrasses focus on the short-term effects, and have been conducted in locations that already begun the shift to macroalgal dominance, usually due to eutrophication. Our goal was to determine the degree to which the timing and magnitude of ephemeral, green macroalgal blooms (Ulva sp.) vary in Bodega Bay, California, USA, where there is little evidence for eutrophication, and how such blooms affect eelgrass Zostera marina. Over 38 mo, we conducted (1) an unmanipulated control treatment, and 3 manipulative treatments: (2) Ulva removal, (3) ambient Ulva, and (4) doubleambient Ulva ('2×'). We observed 4 blooms of varying magnitude and duration, ranging from < 0.5 to > 4 kg m −2. It was only during the largest bloom in 2006 (peak density 8 times that of the smallest observed bloom) that we saw a significant effect on eelgrass, resulting in declines in shoot density of > 50% that persisted for 4 to 6 mo. During this time, the 2× treatment reduced shoot biomass by up to 90%, an effect that persisted for up to 9 mo. Ulva did not affect rates of individual shoot growth, reproductive shoot density, epiphyte load, or sediment organic content at any time during the experiment, suggesting the effect occurs through shoot mortality and reduced shoot production. Interannual variation in the magnitude timing and duration of algal blooms is large and can dramatically alter the effects of blooms on eelgrass. These factors must be considered when interpreting the results of experimental algal additions.

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“…In the tropics, human-produced sedimentation and suspended sediments from watershed, deforestation and mangrove clearing have the greatest environmental impact on seagrasses (Terrados et al 1998, Duarte et al 2008). Removal of terrestrial vegetation leads to erosion and transport of sediments through rivers and streams to estuaries and coastal waters, where the suspended particles create turbidity that reduces water clarity and eliminates seagrass growth and development.…”

Section: Anthropogenic Non-climate Related Impactsmentioning

confidence: 99%

Systematics and Ecology of a New Species of Seagrass (Thalassodendron, Cymodoceaceae) from Southeast African Coasts

Duarte

Bandeira²,

Romeiras

2012

Novon: A Journal for Botanical Nomenclature

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Founded in 1948, IUCN brings together States, government agencies and a diverse range of non-governmental organizations in a unique world partnership: over 1000 members in all, spread across some 140 countries. As a Union, IUCN seeks to influence, encourage and assist societies throughout the world to conserve the integrity and diversity of nature and to ensure that any use of natural resources is equitable and ecologically sustainable.The IUCN Global Marine Programme provides vital linkages for the Union and its members to all the IUCN activities that deal with marine issues, including projects and initiatives of the Regional offices and the 6 IUCN Commissions. The IUCN Global Marine Programme works on issues such as integrated coastal and marine management, fisheries, marine protected areas, large marine ecosystems, coral reefs, marine invasives and protection of high and deep seas. The Nature ConservancyThe mission of The Nature Conservancy is to preserve the plants, animals and natural communities that represent the diversity of life on Earth by protecting the lands and waters they need to survive. The Conservancy launched the Global Marine Initiative in 2002 to protect and restore the most resilient examples of ocean and coastal ecosystems in ways that benefit marine life, local communities and economies. The Conservancy operates over 100 marine conservation projects in more than 21 countries and 22 US states; we work with partners across seascapes and landscapes through transformative strategies and integrated planning and action. The focus is on: (1) Setting priorities for marine conservation using ecoregional assessments and tools for ecosystem based management; (2) Ensuring coral reef survival by creating resilient networks of marine protected areas; (3) Restoring and conserving coastal habitats by utilizing innovative new methods; (4) Building support for marine conservation through strategic partnerships and working to shape global and national policies. Marine conservation in The Nature Conservancy builds upon the organization's core strengths: achieving demonstrable results; working with a wide range of partners, including nontraditional partners; science-based, robust conservation planning methodologies; our experience with transactions; and, perhaps most importantly, our ability and commitment to back up our strategies with human, financial and political capital. For more information e-mail marine@tnc.org or go to www.nature.org/marine. AcknowledgementsWe are deeply grateful to Cathy Short, University of New Hampshire, for her thoughtful comments and careful review of this manuscript. We would like to acknowledge Rodney Salm for his seminal work building resilience into tropical marine conservation programmes. We would like to thank the staff at IUCN, in particular James Oliver, for the design and layout of this publication and Gabriel Grimsditch, for his coordination role. Finally, we would like to thank the Nature Conservancy's Asia Pacific Program, IUCN's Global Marine Programme, and the John D...

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Changes in Community Structure and Biomass of Seagrass Communities along Gradients of Siltation in SE Asia

Cited by 172 publications

References 26 publications

I-C-SEA Change: A participatory tool for rapid assessment of vulnerability of tropical coastal communities to climate change impacts

I-C-SEA Change: A participatory tool for rapid assessment of vulnerability of tropical coastal communities to climate change impacts

Multi-year study of the effects of Ulva sp. blooms on eelgrass Zostera marina

Systematics and Ecology of a New Species of Seagrass (Thalassodendron, Cymodoceaceae) from Southeast African Coasts

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