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21 results for “Algal reefs”
SBC LTER: Reef: Benthic Composition Experiment: fish, algal, and invertebrate density
These data describe the average size and abundance of fishes, understory algae, and benthic invertebrates across 5 sampling sites (Arroyo Quemado, Naples, Isla Vista, Mohawk, Carpentaria) along the Santa Barbara Coast and 2 sites at Santa Cruz Island (San Pedro Point, and Cavern Point). Sampling began September 2021 and is conducted seasonally every 3 months. Data are collected within two circular plots at each sampling site. Plot 1 represents the control plot with no giant kelp removal and plot 2 represents the kelp clearing plot where all giant kelp are removed. Additionally, understory algae are removed seasonally from half of the rock plates for both plots (Plot 1 rock plates #1-6 and Plot 2 rock plates #13-18).
SBC LTER: Reef: Seasonal Kelp Forest Community Dynamics: Invertebrate and algal density
These data describe the abundance of common reef associated species of macro invertebrates and macroalgae within permanent plots of SBCLTER's seasonal kelp forest monitoring program to track long-term patterns in species abundance and diversity. The number of individuals of approximately 50 taxa were recorded by divers along 40 m transects within each plot. Small species of macroalgae and macinvertebrates were counted within six permanent 1 m2 quadrats positioned uniformly along the 40 m transect, while larger species were counted within four contiguous 20 m2 sub-sections of each 40 m x 2 m transect. Also included at the quadrat scale are estimates of an average size-related measurement of each species, which was developed specifically for each species for the purpose of estimating its biomass. The experiment was initiated in 2008 at five reef sites along the mainland coast of the Santa Barbara Channel.
SBC LTER: Reef: Kelp Forest Community Dynamics: Invertebrate and algal density
These data describe the density and size of a select group of about 50 species of benthic invertebrates and understory algae in fixed plots (either 1m x 1m or 20m x 1m) along permanent transects. These data are part of SBCLTER’s kelp forest monitoring program to track long-term patterns in species abundance and diversity of reef-associated organisms in the Santa Barbara Channel, California, USA. The sampling locations in this dataset are at nine reef sites along the mainland coast of the Santa Barbara Channel and at two sites on the north side of Santa Cruz Island. These sites reflect several oceanographic regimes in the channel and vary in distance from sources of terrestrial runoff. Sampling began in 2000, and these data are updated annually. The time period of data collection varied among the 11 kelp forest sites. Sampling at BULL, CARP, and NAPL began in 2000, sampling at the other 6 mainland sites (AHND, AQUE, IVEE, GOLB, ABUR, MOHK) began in 2001 (transects 3, 5, 6, 7, 8 at IVEE were added in 2011). Data collection at the two Santa Cruz Island sites (SCTW and SCDI) began in 2004. See Methods for more information. See Methods for more information.
SBC LTER: Reef: Long-term experiment: Kelp removal: Invertebrate and algal density
These data describe the abundance of common reef associated species of macro invertebrates and macroalgae within permanent plots of a long-term experiment designed to examine trajectories of change in the structure and productivity of kelp forest communities in response to changes in the frequency and severity of disturbance to giant kelp. The number of individuals of approximately 50 taxa were recorded by divers along 40 m transects within each plot. Small species of macroalgae and macinvertebrates were counted within six permanent 1 m2 quadrats positioned uniformly along the 40 m transect, while larger species were counted within four contiguous 20 m2 sub-sections of each 40 m x 2 m transect. Also included at the quadrat scale are estimates of an average size-related measurement of each species, which was developed specifically for each species for the purpose of estimating its biomass. The experiment was initiated in 2008 at five reef sites along the mainland coast of the Santa Barbara Channel and included an annual kelp removal treatment designed to simulate increases in the frequency and severity of winter wave disturbance and a continual kelp removal treatment that allowed the effects of giant kelp on the community to be evaluated. The last experimental removals of giant kelp occurred in winter 2016 or winter 2017, depending on the site. Data collection continued in all plots until spring 2023 to document the recovery trajectory of the reef fish community following the cessation of experimental kelp removal.
MCR LTER: Coral Reef Resilience: Short-term Accumulation of Algal Biomass on Unglazed Ceramic Tiles from July 2010-August 2011
Caged tiles were placed at various sites to measure short-term algal accumulation in the absence of grazing by fishes or large invertebrates. These data document biomass of algae that accumulated on unglazed ceramic tiles (2.5 cm X 2.5 cm) placed inside cages (mesh size = 2.5 cm x 2.5 cm) at various sites around the island of Moorea for a period of 3 to 4 weeks. Three separate experiments were conducted (one during July-August 2010 and two in July-August 2011). In the first experiment (2010_Production), we measured the accumulation of algae after 24 days at two different depths on the forereef (10 and 17 m), and within the lagoon at four different distances from the reef crest (approximately 25, 100, 400, and 700 m). In the second experiment (2011_Production_Summary), we measured the accumulation of algae after 24 or 25 days at six forereef sites (LTER 1, Resilience 2, LTER 3, LTER 4, LTER 5, LTER 6). In this experiment, tiles were placed adjacent to the fish transects (see knb-lter-mcr.6) at a depth of 12 m. In the final experiment (Production_Time_Series), we measured the accumulation of algae on tiles at three day intervals over a period of 31 days. This experiment was conducted at Resilience 2. This material is based upon work supported by the U.S. National Science Foundation under Grant No. OCE 16-37396 (and earlier awards) as well as a generous gift from the Gordon and Betty Moore Foundation. Research was completed under permits issued by the French Polynesian Government (Délégation à la Recherche) and the Haut-commissariat de la République en Polynésie Francaise (DTRT) (Protocole d'Accueil 2005-2018). This work represents a contribution of the Moorea Coral Reef (MCR) LTER Site.
SBC LTER: Reef: Community structure and productivity of subtidal turf and foliose algal assemblages at Naples Reef, 2006
This dataset contains abundance, primary production and respiration of macroalgal and turf assemblages at Naples Reef (Santa Barbara County, CA) during 2006. It includes abundance of macroalgae is in terms of biomass (dry weight), and abundance of animals is in numbers of individuals and biomass (ash-free dry weight). Primary production and respiration of the benthos were measured in situ as changes in oxygen in closed chambers that covered 0.1m2 of the bottom. Species richness data are for macroalgae only. Abundance and diversity were measured for the same plots where oxygen measurements were recorded. These data were presented in: <ulink url="http://dx.doi.org/10.3354/meps08131">Miller, R.J., D. Reed, and M. Brzezinski. 2009. Community structure and productivity of subtidal turf and foliose algal assemblages. Marine Ecology Progress Series 388:1-11 doi: 10.3354/meps08131</ulink>.
SBC LTER: Reef: Long-term experiment: Algal Biomass
These data are taxon-specific estimates of macroalgal standing biomass (grams dry mass m-2) recorded in 40 m x 2 m transects in of each sampling plot at SBC LTER's long-term kelp removal experiment sites. Estimates of macroalgal biomass are derived from measurements of abundance that are recorded as either density or percent cover. Density data are combined with allometric measurements to yield estimates of standing dry mass for taxa whose abundance is measured as density. Mean dry mass per individual is also reported for taxa whose abundance is measured as density. Taxon-specific data of percent cover are converted to biomass using relationships derived from field measurements of percent cover and laboratory measurements of dry mass. Data are updated annually. The kelp removal experiment was initiated in 2008 at four reef sites along the mainland coast of the Santa Barbara Channel. The following three giant kelp manipulations are maintained in sampling plots at each site: - Control: Macrocystis pyriferais left intact in a 2000 m2plot. - Annual removal: Macrocystis pyriferais removed from an adjacent 2000 m2plot once each winter and allowed to re-colonize over the course of the year. - Continuous removal: Macrocystis pyriferais removed from a 200 m2area within the 2000 m2 plot on each sampling date.
The role of sea hares as significant algal herbivores on the Southern Great Barrier Reef
<p>The data files are as follows:</p> <p>Other species - raw data on genera of algae (and some other organisms) observed in quadrats during our surveys at Heron Island</p> <p>algal.distribution.tabulated - summary data on the three most common algal genera used for chi-squared test.</p> <p>algal.dry.weights - data for trials aimed at establishing an equation to convert displacement volume of bundles of Laurencia to dry weights in grams</p> <p>algal.herbivory.trials - data from sea hare herbivory trials, including amount eaten each 24 hour trial and sea hare size.</p> <p>All data was collected by the primary researchers in the field.</p> <p>The R script to process these files is available here: https://github.com/rcrofts/SeaHareScript.git.</p> <p>These data were processed using RStudio version 1.2.5019 </p>
Fig. 6 in Multiple Environmental Factors Increase the Niche Complexity and Species Diversity of Brachyuran Crabs in an Intertidal Algal Reef Ecosystem in Northwestern Taiwan.
Fig. 6. The box plot of abundance of all crab species with a carapace width smaller than 10 mm across the six sites (A) and seasons (B) in the reef habitat. The core volumes are 950 cm3.
Fig. 2 in Multiple Environmental Factors Increase the Niche Complexity and Species Diversity of Brachyuran Crabs in an Intertidal Algal Reef Ecosystem in Northwestern Taiwan.
Fig. 2. The species compositions in all six study sites in the algal reef habitat. Each bar represents the total number of species recorded at each site. Family is the lowest taxonomic category in this figure.
Fig. 3 in Multiple Environmental Factors Increase the Niche Complexity and Species Diversity of Brachyuran Crabs in an Intertidal Algal Reef Ecosystem in Northwestern Taiwan.
Fig. 3. Relationship between the species richness and local contribution to beta diversity (LCBD) indexes among the six sites in the algal reef habitat.
Fig. 5 in Multiple Environmental Factors Increase the Niche Complexity and Species Diversity of Brachyuran Crabs in an Intertidal Algal Reef Ecosystem in Northwestern Taiwan.
Fig. 5. The box plot of abundance of all crab species with carapace width larger than 10 mm for three factors: A: season; B: tidal and sampling time; C: study site and sampling time. The gray bar is daytime; the dark gray bar is night. The high tidal level is the edge between the sand and reef; the medium tidal level is at the algal reef 1 m below sea level.
Data from: Niche breadth and divergence in sympatric cryptic coral species (Pocillopora spp.) across habitats within reefs and among algal symbionts
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Fig. 1 in Multiple Environmental Factors Increase the Niche Complexity and Species Diversity of Brachyuran Crabs in an Intertidal Algal Reef Ecosystem in Northwestern Taiwan.
Fig. 1. The six study sites in the present study.
Algal symbiont diversity in Acropora muricata from the extreme reef of Bouraké associated with resistance to coral bleaching
<p>Widespread coral bleaching has generally been linked to high water temperatures at larger geographic scale. However, teh bleaching response can be highly variable aming individuals of the same species, between different species, and across localities; what causes this variability remais unresolved. Here, we tracked bleached and non-bleached colonies of <em>Acropora muricata </em>to see if they recovered or died following a stress event inside the semi-enclosed lagoon of Bouraké (New Caledonia), where corals are long-term acclimatized to extreme conditions of temperature, pH and dissolved oxygen, and at a nearby control reef. We describe Symbiodiniaceae community changes, metabolic responses, and energetical reserves (12 physiological traits evaluated) during La Niña warm and rainy summer in 2021. Widespread coral bleaching (score 1 and 2 on coral colour health chart) was observed only in Bouraké, likely due to the combination of the high temperatures (up to 32 <sup>o</sup>C) and heavy rain. All colonies (i.e., Bouraké and reference site) had <em>Cladocopium </em> as their main genera. Unbleached colonies in Bouraké had a specific ITS2-type profile (proxies for Symbiodiniaceae genotypes), while the bleached colonies in Bouraké had the same ITS2-type profile of control colonies during the stress event. After four months, teh few bleached colonies thata survived acquired the same ITS2 type profiles of the unbleached resistant colonies. In terms of physiological performances, all bleached corals showed metabolic depression (e.g., P<sub>gross </sub>and R<sub>dark</sub>). In contrast, unbleahed colonies in Bouraké maintained higher metabolic rates and energetic reserves compared to control corals. Our study suggests that <em>Acropora muricata</em> enhanced their resistance to bleaching thanks to specific Symbiodiniaceae, while energetic reserves may increase their resilience after stress. </p>
Algal symbiont diversity in Acropora muricata from the extreme reef of Bouraké associated with resistance to coral bleaching
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Increased sediment load destabilize algal turf at two different fringing reefs; Evaluating responses across a stress gradient, Moorea, French Polynesia, 2016
Seven reefs in Moorea French Polynesia were examined for sediment and turf characteristics to establish a baseline for naturally occurring proportions of sediment within the turf matrix. At each of the seven sites turf filament heights and sediment depths within the turf matrix were measured using a galvanized mesh measuring device calibrated by 1mm increments. All surveys were conducted between 2-3m in depth between April-May of 2016. We then conducted a two-factor experiment where sediment depth was manipulated at two sites surveyed with strong differences in turf communities (Maharepa and Gump). Our experiment ran for 30 days, with sediment treatments maintained every four days.
Data from: Simultaneous synergist, antagonistic, and additive interactions between multiple local stressors all degrade algal turf communities on coral reefs
1.Ecological communities are subjected to multiple anthropogenic stressors at both global and local scales that are increasing in number and magnitude. Stressors can interact in complex ways, and are classified as additive, synergistic, or antagonistic; the nature of the interaction is key to predicting changes and understanding community resilience. Coral reefs are among the most impacted communities and have shifted from coral- to algal-dominated states, and overfishing, nutrient enrichment, and sedimentation are local stressors that often co-occur and may support degraded algal states. Short algal turfs are abundant benthic space-holders on healthy reefs that may be pushed by local stressors to long algal turfs, a more degraded state that may prevent recovery to coral dominance. 2. We conducted a fully crossed 3-factor field experiment on short algal turf communities manipulating herbivory pressure (+/-cages), nutrients (+/-fertilizer), and sediments (natural accumulation/removal). We applied stressors for 16 days, removed them, and monitored turf height during and after manipulations. 3.We found significant pair-wise interactions between all stressors pushed the community toward a degraded state with longer algal turfs. All three types of interactions (additive, synergistic, and antagonistic) were common and occurred in equal frequency, suggesting more investigations into all types are needed to accurately predict community responses to multiple stressors. For example, when herbivores were present nutrients and sediments interacted additively while in the absence of herbivores, nutrients and sediments interacted synergistically. All interactions broke down following termination of experimental manipulations and all effects were undetectable after 49 days, indicating this reef may be resilient, at least when stressors are applied on a short time scale. 4.Synthesis. Because management of local stressors is often more tractable than global stressors, local management has been proposed as a means to offset global stressors. However, ecological communities often experience multiple local stressors simultaneously, and interactions between stressors, including synergisms and antagonisms, may be the source of non-linear shifts in communities or 'ecological surprises'. The majority of interactions in our study were both strong and non-linear and we suggest that, if pervasive across systems, non-linear interactions may drive the recent global increase in 'ecological surprises'.
Data from: Simultaneous synergist, antagonistic, and additive interactions between multiple local stressors all degrade algal turf communities on coral reefs
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Supplementary material 1 from: Tu T-H, Dai C-F (2022) A new species of anthothelid octocoral (Cnidaria, Alcyonacea) discovered on an algal reef of Taiwan. ZooKeys 1089: 37-51. https://doi.org/10.3897/zookeys.1089.77273
Table S1
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International Brain Laboratory public data
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OpenNeuro
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