Community Structure of Hermatypic Corals at French Frigate Shoals, Northwestern Hawaiian Islands: Capacity for Resistance and Resilience to Selective Stressors

Kenyon, Jean C.; Vroom, Peter S.; Page, Kimberly N.; Dunlap, Matthew J.; Wilkinson, Casey B.; Aeby, Greta S.

doi:10.1353/psc.2006.0006

Cited by 32 publications

(46 citation statements)

References 28 publications

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“…Locations of site-specific surveys were determined on the basis of (1) filling gaps in the locations of baseline assessments conducted during an expedition to the NWHI in 2000; (2) depths that allowed three dives/day/diver; (3) constraints imposed by other ship-supported operations; and (4) sea conditions. Detailed methods for recording videographic and size class data are presented in Kenyon et al (2006b).…”

Section: Benthic Surveysmentioning

confidence: 99%

“…Capture, sampling, and analysis of frames from video transects are described in Kenyon et al (2006b). The taxa that could be identified were Acropora valida, Pocillopora meandrina, P. ligulata, Porites lobata, P. compressa, Montipora capitata, Montipora sp., Leptastrea sp., Fungia sp., and Pavona duerdeni.…”

Section: Data Extraction and Analysismentioning

confidence: 99%

“…The taxa that could be identified were Acropora valida, Pocillopora meandrina, P. ligulata, Porites lobata, P. compressa, Montipora capitata, Montipora sp., Leptastrea sp., Fungia sp., and Pavona duerdeni. Detailed methods for determining coral percent cover from photoquadrat imagery are also presented in Kenyon et al (2006b).…”

Section: Data Extraction and Analysismentioning

confidence: 99%

“…Maragos et al (2004) provide two indices of the relative occurrence and abundance of 7 coral species at Maro Reef based on qualitative Rapid Ecological Assessment surveys at 9 sites. Methods described in Kenyon et al (2006b), which involved the generation of a single ranking using the separate occurrence and abundance indices, were used to compare these indices with the relative abundance of coral species as determined by percent cover analysis of photoquadrats in this study.…”

Section: Data Extraction and Analysismentioning

confidence: 99%

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Community structure of hermatypic corals at Maro Reef in the northwestern Hawaiian Islands: A unique open atoll

Kenyon¹,

Wilkinson²,

Aeby³

2008

Atoll Research Bulletin

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Percent cover of shallow-water (< 20m) scleractinian corals at Maro Reef, an open atoll with no perimeter reef in the Northwestern Hawaiian Islands (NWHI), was quantified from analysis of imagery recorded along more than 81 km of benthic habitat by towed divers and at 18 sites surveyed with video transects and photoquadrats. Colony densities and size class distributions were determined from censuses within belt transects at the same sites. All three methods showed statistically significant differences in total coral cover and relative abundance of coral genera among four geographic sectors characterized by different exposure to prevailing wave regimes. Massive and encrusting growth forms of Porites dominated coral cover and density throughout all sectors, with Montipora the next most dominant genus. Patterns of highest coral cover differed from that of most other classic and open atolls in the NWHI. Populations of Pocillopora, though contributing little to percent cover, attained the largest colony sizes of any reef system in the NWHI surveyed with similar methods. Numerous indicators, including coral percent cover, recovery from bleaching, low coral disease prevalence, rarity of crown-of-thorns seastars, and high larval recruitment rates suggest healthy coral communities at Maro Reef, although the predicted accumulation of marine debris from outside sources remains problematic. These data enable the most comprehensive quantitative description of coral communities at Maro Reef produced to date and are a valuable baseline for assessing change.

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Section: Benthic Surveysmentioning

confidence: 99%

Section: Data Extraction and Analysismentioning

confidence: 99%

Section: Data Extraction and Analysismentioning

confidence: 99%

Section: Data Extraction and Analysismentioning

confidence: 99%

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Community structure of hermatypic corals at Maro Reef in the northwestern Hawaiian Islands: A unique open atoll

Kenyon¹,

Wilkinson²,

Aeby³

2008

Atoll Research Bulletin

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“…In contrast, mean scleractinian coral cover from towed-diver surveys between depths of 10 and 12 m on the fore reef (n = 175 frames) was 26.1% (SE 1.4) (data not shown). Estimates of coral cover derived from site-specific surveys generally exceed those derived from towed-diver surveys (Kenyon et al, 2006b(Kenyon et al, , 2007a, because site-specific surveys target hard-bottom communities, whereas broad-scale surveys include more variable substrate. Our estimate of coralline algal cover from towed-diver surveys between depths of 10 and 12 m on the fore reef (18.8%, SE 1.5) also differs from that reported by Sandin et al (2008), ~ 29%.…”

Section: Discussionmentioning

confidence: 99%

Characterization of Coral Communities at Kingman Reef in the Remote Central Pacific Ocean

Kenyon¹,

Maragos²,

Wilkinson³

2010

Atoll Research Bulletin

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Kingman Reef, an atoll in the northern Line Islands of the central Pacific, is among the last of the remote locations in the U.S. Pacific to be scientifically explored underwater, and previously published surveys of its benthic reef communities have been limited to the seaward-facing fore-reef habitat. Here, we apply multivariate statistical analyses to data acquired in 2004 from several complementary survey methods that operate at different scales of spatial and taxonomic resolution to characterize the coral communities in 5 habitats, 3 of which are further stratified by geographic sector or depth zone. Coral cover is highest in the small lagoon pool inside the southeast vertex of the perimeter reef, followed by the fore reef, patch reefs, reef flat, and lagoon slope. Benthic communities are more highly variable on the fore reef, but the coral cover and colony abundances are less dominated by a few key genera than in other habitats. While the relative representation of coral taxa varies among habitats, Porites, Fungia, Pocillopora, Sinularia, Turbinaria, Acropora, and Favia all contribute > 10% of the total coral cover in at least one habitat. We provide a list of 188 anthozoan and hydrozoan corals observed at Kingman Reef during survey activities since the year 2000. Coral diversity at Kingman is similar to that at Palmyra Atoll to the south but is high compared to other adjacent atolls and reef islands to the south and west (Phoenix and Line Islands) where data are available. Our spatially widespread surveys that generate independent metrics of benthic cover and coral abundance collectively provide the most comprehensive description of coral communities at Kingman Reef produced to date and also provide an important record by which to monitor the response of this community to changing ocean conditions.

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Development of benthic monitoring methods using photoquadrats and scuba on heterogeneous hard‐substrata: a boulder‐slope community case study

Rein

Schoeman

Brown

et al. 2011

Aquatic Conservation

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ABSTRACT1. Photoquadrats enable efficient and cost-effective quantitative estimation of epibenthic communities. Despite their utility, however, there has been limited use of photoquadrats for such purposes in temperate north-west Europe, where there is also a growing need for standardized approaches to marine monitoring.2. A rapid photoquadrat-based methodology was trialled by scuba divers on a heterogeneous boulder-slope habitat in a Special Area of Conservation (SAC) in Northern Irish waters. To investigate the monitoring potential of the method, the benthic community was randomly sampled in the summers of 2009 and 2010. The community was represented at species level (community composition) and by functional group (community structure), and the data-extraction resolution was varied using different numbers of point intercepts per image (25, 50, and 100) to assess the balance of precision and efficiency with regard to detection of community change.3. The method was efficient in situ and yielded sufficient sample images for estimation of local benthic community diversity (number of species). The community varied significantly, with six distinct sub-communities identified within the survey area. High spatial variability obscured detection of temporal changes in the overall community composition and structure. However, spatial variability was substantially reduced by testing only the dominant sub-community, in which significant changes were detected between 2009 and 2010.4. The ability of the photoquadrat to detect individual taxa was related to data resolution: the more point-intercepts sampled, the more taxa were discovered, but the data-extraction effort was greater. After considering the ability of the photoquadrat method to quantify number of species and to detect change in community structure, as well as its precision and efficiency, the inspection of 50 point intercepts per sample image was found to be optimal. These findings demonstrate the benefits of photoquadrat-based methods and highlight their potential as a standard approach to marine monitoring.

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Community Structure of Hermatypic Corals at French Frigate Shoals, Northwestern Hawaiian Islands: Capacity for Resistance and Resilience to Selective Stressors

Cited by 32 publications

References 28 publications

Community structure of hermatypic corals at Maro Reef in the northwestern Hawaiian Islands: A unique open atoll

Community structure of hermatypic corals at Maro Reef in the northwestern Hawaiian Islands: A unique open atoll

Characterization of Coral Communities at Kingman Reef in the Remote Central Pacific Ocean

Development of benthic monitoring methods using photoquadrats and scuba on heterogeneous hard‐substrata: a boulder‐slope community case study

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