The effect of micrograzers on algal community structure in a coral reef microcosm

1981 ◽  
Vol 61 (2-3) ◽  
pp. 167-177 ◽  
Author(s):  
S. H. Brawley ◽  
W. H. Adey
Keyword(s):  
Community Structure ◽  
Coral Reef ◽  
Algal Community

scholarly journals Potential impact of increased temperature and CO2 on particulate dimethylsulfoniopropionate in the Southeastern Bering Sea

2011 ◽  
Vol 2 (1) ◽  
pp. 33 ◽  
Author(s):  
Peter A. Lee ◽  
Sarah F. Riseman ◽  
Clinton E. Hare ◽  
David A. Hutchins ◽  
Karine Leblanc ◽  
...  
Keyword(s):  
Community Structure ◽  
Continental Shelf ◽  
Bering Sea ◽  
Feedback Mechanism ◽  
Climate Feedback ◽  
Algal Community ◽  
Central Basin ◽  
Phytoplankton Assemblages ◽  
Potential Impact ◽  
Relative Abundances

The potential impact of elevated sea surface temperature (SST) and pCO2 on algal community structure and particulate dimethylsulfoniopropionate (DMSPp) concentrations in the southeastern Bering Sea was examined using a shipboard “Ecostat” continuous culture system. The ecostat system was used to mimic the conditions projected to exist in the world's oceans by the end of this century (i.e. elevated pCO2 (750 ppm) and elevated SST (ambient + 4°C). Two experiments were conducted using natural phytoplankton assemblages from the high-nutrient low-chlorophyll (HNLC) central basin and from the middle domain of the southeastern continental shelf. At the HNLC site, the relative abundances of haptophytes and pelagophytes were higher and the relative abundance of diatoms lower under “greenhouse” conditions (i.e. combined 750 ppm CO2 and elevated temperature) than control conditions (380 ppm CO2 and ambient temperature). This shift in algal community structure was accompanied by increases in DMSPp (2–3 fold), DMSPp:Chl a (2–3 fold) and DMSP:PON (2 fold). At the continental shelf site, the changes in the relative abundances of haptophytes, pelagophytes and diatoms under “greenhouse” conditions were similar to those observed at the HNLC site, with 2.5 fold increases in DMSPp, 50–100% increases in DMSPp:Chl a and 1.8 fold increases in DMSP:PON. At both locations, changes in community structure and the DMSPp parameters were largely driven by increasing temperature. The observed changes were also consistent with the phytoplankton-DMS-albedo climate feedback mechanism proposed in the Charlson-Lovelock-Andreae-Warren (CLAW) hypothesis.

scholarly journals Transects, quadrats, or points? What is the best combination to get a precise estimation of a coral community?

2019 ◽  
Author(s):  
Luis M. Montilla ◽  
Emy Miyazawa ◽  
Alfredo Ascanio ◽  
María López-Hernández ◽  
Gloria Mariño-Briceño ◽  
...  
Keyword(s):  
Community Structure ◽  
Coral Reef ◽  
Effect Size ◽  
Standard Error ◽  
Scleractinian Coral ◽  
Statistical Power ◽  
Coral Community ◽  
Sampling Effort ◽  
Precise Estimation

ABSTRACTThe characteristics of coral reef sampling and monitoring are highly variable, with numbers of units and sampling effort varying from one study to another. Numerous works have been carried out to determine an appropriate effect size through statistical power, however, always from a univariate perspective. In this work, we used the pseudo multivariate dissimilarity-based standard error (MultSE) approach to assess the precision of sampling scleractinian coral assemblages in reefs of Venezuela between 2017 and 2018 when using different combinations of number of transects, quadrats and points. For this, the MultSE of 36 sites previously sampled was estimated, using four 30m-transects with 15 photo-quadrats each and 25 random points per quadrat. We obtained that the MultSE was highly variable between sites and is not correlated with the univariate standard error nor with the richness of species. Then, a subset of sites was re-annotated using 100 uniformly distributed points, which allowed the simulation of different numbers of transects per site, quadrats per transect and points per quadrat using resampling techniques. The magnitude of the MultSE stabilized by adding more transects, however, adding more quadrats or points does not improve the estimate. For this case study, the error was reduced by half when using 10 transects, 10 quadrats per transect and 25 points per quadrat. We recommend the use of MultSE in reef monitoring programs, in particular when conducting pilot surveys to optimize the estimation of the community structure.

Algal turf scrubber (ATS) floways on the Great Wicomico River, Chesapeake Bay: productivity, algal community structure, substrate and chemistry1

2013 ◽  
Vol 49 (3) ◽  
pp. 489-501 ◽  
Author(s):  
Walter H. Adey ◽  
H. Dail Laughinghouse ◽  
John B. Miller ◽  
Lee-Ann C. Hayek ◽  
Jesse G. Thompson ◽  
...  
Keyword(s):  
Community Structure ◽  
Chesapeake Bay ◽  
Algal Community ◽  
Algal Turf ◽  
Algal Turf Scrubber

Localized Impacts of Hurricane Irma on Diadema antillarum and Coral Reef Community Structure

2019 ◽  
Vol 43 (5) ◽  
pp. 1133-1143
Author(s):  
Julia N. Kobelt ◽  
William C. Sharp ◽  
Travis N. Miles ◽  
Colette J. Feehan
Keyword(s):  
Community Structure ◽  
Coral Reef ◽  
Diadema Antillarum ◽  
Coral Reef Community ◽  
Reef Community ◽  
Hurricane Irma
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