11th ICRS Abstract book - Nova Southeastern University
11th ICRS Abstract book - Nova Southeastern University
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 />
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