Response of Reef-Fish Habitat Specialists to Ramicrusta sp. Algal Overgrowth of Fire Coral
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1 Response of Reef-Fish Habitat Specialists to Ramicrusta sp. Algal Overgrowth of Fire Coral AnnaRose Adams Department of BioResource Research Oregon State University
2 Habitat association
3 Habitat specialization Generalists Specialists
4 Munday 2004 Habitat Specialists at Risk
5 Coral as Habitat
6 Algal Overgrowth Conditions change
7 Ramicrusta Crustose alga Recently described species Observed in Bonaire and Jamaica Overgrows coral
8 How does Ramicrusta overgrowth of coral affect fish who are habitat specialists?
9 Study Coral: Millepora complanata fire coral
10 Predictions Normal Overgrown
11
12
13 Coral Measurements Volume dimensions Signs of distress Percent overgrowth
14 Fish Counts 40 cm criteria Number of fish 40 Family of fish
15 Percent Overgrowth 0% 1 25% 26 50% 51 75% % Increasing Ramicrusta overgrowth
16 Fish Abundance and Diversity Abundance: number of fish Richness: number of families Evenness: equality of representation among families Composite Diversity: combined richness and evenness
17 Number of coral heads observed Trends in Overgrowth % % 1-25% 26-50% 51-75% % Algal Overgrowth Category
18 Fish Abundance p=0.01 Greater mean number of fish at high levels of overgrowth Suggests trend opposite to predictions Difference of 1 fish not ecologically significant
19 Fish Diversity Higher mean values with increasing overgrowth Statistically nonsignificant
20 Structural Complexity Complexity increases with coral size
21 Influence of Coral Volume p< Mean coral size significantly smaller at low overgrowth Differences in fish communities influenced by coral size
22 Large values could be a product of bigger coral heads
23
24 Influence of Ramicrusta Potential to have little effect on coral complexity Study examined recent Ramicrusta overgrowth Fully overgrown corals die and are eroded Over time Ramicrusta could impact coral structure
25 Conclusions Ramicrusta is changing the sea floor composition of Lac Bay, Bonaire. Differences in coral volume may have influenced fish abundance and diversity. Fish used fire coral regardless of presence of recent Ramicrusta overgrowth.
26 Acknowledgments Oregon State University ER Jackman Internship Support Program Dr. Rita Peachey and staff CIEE Bonaire Research Station Tom Stabler Goucher College Dr. Mark Hixon, Dr. Selina Heppell and Dr. Scott Heppell Dept. Zoology and Dept. Fish and Wildlife, Oregon State University
27 Questions?
28 References Munday PL (2004) Habitat loss, resource specialization, and extinction on coral reefs. Global Change Biol 10:
29 Fish Families Observed Gobiidae - Gobies Labridae - Wrasse Blennidae Blennies Grammatidae Basslets Serranidae Grouper/Grasby/Creolefish Pomacanthidae Damselfish Lutjanidae Snapper Balistidae Triggerfish Scaridae Parrotfish Acanthuridae Surgeonfishes and Tangs
30 Equations Composite Diversity: H = pi ln(pi) pi = proportion of individuals observed within each family Evenness: E = H / ln(s) S = family richness
31 Data Analysis Anderson-Darling Normality tests (failed) Kruskal-Wallis tests (α = 0.05) Mann-Whitney U-tests (α = 0.05) Linear regression analysis
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MEMORANDUM. Joan Dukes, NPCC. Michele DeHart. DATE: August 5, Data Request
FISH PASSAGE CENTER 1827 NE 44 th Ave., Suite 240, Portland, OR 97213 Phone: (503) 230-4099 Fax: (503) 230-7559 http://www.fpc.org/ e-mail us at fpcstaff@fpc.org MEMORANDUM TO: Joan Dukes, NPCC FROM: Michele