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11th ICRS Abstract book - Nova Southeastern University

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Oral Mini-Symposium 25: Predicting Reef Futures in the Context of Climate Change<br />

25-50<br />

Sublethal Response Of Reef Fishes To Low Coral Cover<br />

David FEARY* 1 , Mark MCCORMICK 2 , Geoffrey JONES 2<br />

1 United Nations <strong>University</strong>-INWEH, Dubai, United Arab Emirates, 2 James Cook<br />

<strong>University</strong>, Townsville, Australia<br />

Although the global decline in coral reef health is likely to have profound effects on reef<br />

associated fishes, these effects are poorly understood. While declining coral cover can<br />

reduce the abundance of reef fishes through direct effects on recruitment and/or<br />

mortality, recent evidence suggests that individuals may survive in disturbed habitats, but<br />

may experience sublethal reductions in their condition. To test this, we examined the<br />

response of 2 coral associated damselfishes (Pomacentridae), Chrysiptera parasema and<br />

Dascyllus melanurus, to varying levels of live coral cover. Growth, persistence and the<br />

condition of individuals were quantified on replicate coral colonies in 3 coral treatments:<br />

100 % live coral (control), 50 % live coral (partial) and 0 % live coral (dead). The growth<br />

rates of both species were directly related to the percentage live coral cover, with<br />

individuals associated with dead corals exhibiting the slowest growth, and highest growth<br />

on control corals. Differences in the growth of individuals between treatments occurred<br />

after 29 days. There was no significant difference in the numbers of fishes persisting or<br />

the condition of individuals between different treatments on this time-scale. We argue<br />

that slower growth in disturbed habitats will delay the onset of maturity, reduce lifetime<br />

fecundity and increase vulnerability to gape-limited predation. Hence, immediate effects<br />

on recruitment and survival may underestimate the longer-term impacts of declining coral<br />

on the structure and diversity of the coral-associated reef fish communities.<br />

25-51<br />

Climate Warming And The Ocean-Scale Integrity Of Coral Reef Ecosystems<br />

Nick GRAHAM* 1 , Tim MCCLANAHAN 2 , Aaron MACNEIL 3 , Shaun WILSON 4 , Nick<br />

POLUNIN 5 , Simon JENNINGS 6 , Pascale CHABANET 7 , Susan CLARK 8 , Mark<br />

SPALDING 9 , Yves LETOURNEUR 10 , Lionel BIGOT 11 , Rene GALZIN 12 , Marcus<br />

OHMAN 13 , Kajsa GARPE 13 , Alasdair EDWARDS 5 , Charles SHEPPARD 14<br />

1 School of Marine Science & Technology, Newcastle <strong>University</strong>, Newcastle upon Tyne,<br />

United Kingdom, 2 Wildlife Conservation Society, New York, NY, 3 Panama City<br />

Laboratory, NOAA, Panama City Beach, FL, 4 James Cook <strong>University</strong>, Townsville,<br />

Australia, 5 Newcastle <strong>University</strong>, Newcastle upon Tyne, United Kingdom, 6 Centre for<br />

Environment, Fisheries and Aquaculture Science, Lowestoft, United Kingdom, 7 Institut<br />

de Recherche pour le Developpement, Noumea, New Caledonia, 8 Natural England,<br />

Newcastle upon Tyne, United Kingdom, 9 The Nature Conservancy, Newmarket, United<br />

Kingdom, 10 Universite de la Mediterranee, Marseille, France, 11 Universite de La<br />

12<br />

Reunion, Saint-Denis, Reunion, Universite de Perpignan, Perpignan, France,<br />

13 14<br />

Stockholm <strong>University</strong>, Stockholm, Sweden, <strong>University</strong> of Warwick, Coventry, United<br />

Kingdom<br />

Coral reefs have emerged as one of the ecosystems most vulnerable to climate variation<br />

and change. While the contribution of climate warming to the loss of live coral cover has<br />

been well documented across large spatial and temporal scales, the associated effects on<br />

fish have not. Such information is important as coral reef fish assemblages are the most<br />

species dense vertebrate communities on earth, contribute critical ecosystem functions<br />

and provide crucial ecosystem services to the burgeoning human societies in tropical<br />

countries. Here we assess the impacts of the 1998 mass bleaching event on coral cover,<br />

reef structural complexity, and the functionality and abundance of reef fishes across the<br />

Indian Ocean. Using Bayesian meta-analysis we show changes in the size structure,<br />

diversity and trophic composition of the reef fish community have followed coral<br />

declines. Furthermore, using Bayesian predictive intervals we predict how different<br />

components of the fish community will respond to any future changes to coral cover<br />

across the region. Although ocean scale integrity of these coral reef ecosystems has been<br />

lost, it is positive to see the effects are spatially variable at various scales with impacts<br />

and vulnerability affected by geography, oceanography and management regime.<br />

Existing no-take marine protected areas still support high biomass of fish, however they<br />

had no positive affect on the response of the ecosystem to large-scale disturbance. This<br />

suggests that it is imperative that future planning identifies regional refugia from climate<br />

change as priorities for protection.<br />

25-52<br />

Relating Patterns in Coral Bleaching And The Extrinsic Environment Over Multiple<br />

Scales: Opportunities For Prioritizing Resource Management in Florida in Response To<br />

Climate Change<br />

Eric MIELBRECHT* 1 , Daniel WAGNER 2 , Alex SCORE 3 , Lara HANSEN 4<br />

1 Emerald Coast Environmental Consulting, Washington, DC, 2 Biological Sciences, Florida<br />

Institute of Technology, Melbourne, FL, 3 World Wildlife Fund, Marathon, FL, 4 World Wildlife<br />

Fund, Washington, DC<br />

Coral reefs were one of the first ecosystems where the effects of climate change were readily<br />

apparent. As a result of their high vulnerability to climate change, Florida’s stakeholders and<br />

decision-makers urgently need targeted research, clear communications, and accessible tools to<br />

better understand the impacts of climate change and coral bleaching to the Florida Keys<br />

National Marine Sanctuary so they can develop and implement successful management efforts.<br />

The Climate Change: Linking Environmental Analysis to Decision Support (LEADS) initiative<br />

brought together scientists and stakeholders to analyze patterns in coral resilience to climate<br />

change and transform these findings into effective management strategies. Quantitative<br />

landscape ecology techniques were combined with GIS tools to perform a multi-scale metaanalysis<br />

of the relationships between extrinsic environmental factors, coral community structure<br />

and bleaching response to suggest patterns of resilience within the Florida Keys National<br />

Marine Sanctuary. Data from a wide range of coral surveys, water quality monitoring and other<br />

environmental monitoring efforts were obtained through 2007 from institutions cooperating<br />

with the Florida Reef Resilience Program and validated for use in testing relationships at both<br />

ecological and bleaching event temporal and spatial scales. Resulting patterns of potential<br />

resilience provide a new way of prioritizing management efforts in order to respond to climate<br />

change within the Florida Keys National Marine Sanctuary.<br />

25-53<br />

Using Climate Information To Improve Coral Reef Management<br />

Elizabeth MCLEOD* 1 , Rodney SALM 1 , Axel TIMMERMANN 2 , Russell MOFFITT 3<br />

1 The Nature Conservancy, Honolulu, HI, 2 International Pacific Research Center, School of<br />

Ocean and Earth Science and Technology, <strong>University</strong> of Hawaii, Honolulu, HI, 3 JIMAR/Univ.<br />

of Hawaii & NOAA Pacific Islands Fisheries Science Center, Honolulu, HI<br />

Climate change is challenging marine protected area (MPA) managers to build adaptability into<br />

their conservation strategies. Managers need tools to identify coral communities at low risk of<br />

succumbing to thermal stress both to protect existing MPA investments, and to guide decisions<br />

about the location and design of new MPAs. We used available data from remote sensing and<br />

other monitoring systems to generate maps of the Coral Triangle indicating reefs of higher and<br />

lower thermal stress now and projected into the future. Using 4 km Pathfinder 5.0 Sea Surface<br />

Temperature data, we analyzed intra- and inter-annual variation in sea surface temperature and<br />

identified reef areas with reliably stable conditions and others that are more likely to suffer<br />

anomalous temperature increases leading to thermal stress. Weekly Pathfinder SST composites<br />

from 1985 through the present were compared to 1° C over the expected summertime<br />

maximum, recording those that exceeded this level and tallying accumulated Degree Heating<br />

Weeks. The analysis determined which locations sustained levels of high potential thermal<br />

stress (“hot spots”) or little to no thermal stress (“cool spots”) and compared those to known<br />

bleaching events. We used Coupled General Circulation models (CGCM) to provide estimates<br />

of future climate change at a global scale. These models used different climate forcing scenarios<br />

from the Intergovernmental Panel on Climate Change. For regional estimates, the CGCM<br />

simulations disagree considerably, hence we used a probabilistic multi-model ensemble<br />

forecasting approach for future climate change. This approach allowed us to identify areas in<br />

the Coral Triangle which are "optimal" in a probabilistic sense which helps decision makers and<br />

planners to include uncertainty estimates in their planning efforts. Maps of reef vulnerability<br />

provide marine conservation planners with a tool to help identify coral reefs for conservation<br />

purposes that are well positioned to survive climate-related increases in temperature.<br />

240

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