Quantity, composition, and source of sediment collected in sediment traps along the fringing coral reef off Molokai, Hawaii

Bothner, Michael H.; Reynolds, Richard L.; Casso, M.; Storlazzi, Curt D.; Field, Michael E.

doi:10.1016/j.marpolbul.2006.01.008

Cited by 56 publications

(31 citation statements)

References 23 publications

(35 reference statements)

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“…This is of concern to the coral reef research community, for sediment tube traps are commonly used by many researchers and regulatory agencies to determine "sedimentation rates" (e.g., Almada-Villela et al, 2003;Hill and Wilkinson, 2004). The findings presented here, along with previous studies (Gardner et al, 1983;White, 1990;and Jurg, 1996;Storlazzi et al, 2004;Bothner et al, 2006), suggest the following: (a) Sediment traps should have greater than a 10:1 length-to-width ratio, and all traps used within a study should have the same size and ratio; and (b) All sediment traps in a study should be deployed with their traps openings at a similar height above the seabed. In locations where current and wave-orbital speeds are sufficient to resuspend the adjacent seabed material, the trap collection rates must be analyzed in the context of the site's hydrodynamics to determine if the trapped material resulted from local resuspension or advected from some other location.…”

Section: The Application Of Sediment Traps To Coral Reef Environmentsmentioning

confidence: 53%

Sedimentation processes in a coral reef embayment: Hanalei Bay, Kauai

et al. 2009

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a b s t r a c t a r t i c l e i n f oOceanographic measurements and sediment samples were collected during the summer of 2006 as part of a multi-year study of coastal circulation and the fate of terrigenous sediment on coral reefs in Hanalei Bay, Kauai. The goal of this study was to better understand sediment dynamics in a coral reef-lined embayment where winds, ocean surface waves, and river floods are important processes. During a summer period that was marked by two wave events and one river flood, we documented significant differences in sediment trap collection rates and the composition, grain size, and magnitude of sediment transported in the bay. Sediment trap collection rates were well correlated with combined wave-current near-bed shear stresses during the non-flood periods but were not correlated during the flood. The flood's delivery of fine-grained sediment to the bay initially caused high turbidity and sediment collection rates off the river mouth but the plume dispersed relatively quickly. Over the next month, the flood deposit was reworked by mild waves and currents and the fine-grained terrestrial sediment was advected around the bay and collected in sediment traps away from the river mouth, long after the turbid surface plume was gone. The reworked flood deposits, due to their longer duration of influence and proximity to the seabed, appear to pose a greater long-term impact to benthic coral reef communities than the flood plumes themselves. The results presented here display how spatial and temporal differences in hydrodynamic processes, which result from variations in reef morphology and orientation, cause substantial variations in the deposition, residence time, resuspension, and advection of both reef-derived and fluvial sediment over relatively short spatial scales in a coral reef embayment.Published by Elsevier B.V.

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Section: The Application Of Sediment Traps To Coral Reef Environmentsmentioning

confidence: 53%

Sedimentation processes in a coral reef embayment: Hanalei Bay, Kauai

et al. 2009

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“…First, it highlights that sediment traps do not measure net vertical sediment flux to, and accumulation on, the coral reef surface, for if this were the case the d and composition of the material in the sediment trap would match that on the seabed. This discrepancy occurs because material falling into a sediment trap has a much lower potential for resuspension than the same material that settles on the adjacent reef surface, as suggested by Bothner et al (2006). Thus, the use of ''sedimentation rate'' instead of ''trap collection rate'' or ''trap accumulation rate'' for P therefore appears incorrect.…”

Section: Discussionmentioning

confidence: 99%

“…Thus, while these results might not be applicable to reef passages with very energetic currents or some back-reef lagoons and deep embayments protected from waves, they likely characterize most fore reefs that are exposed to storm waves and trade-wind waves. For more information on the study areas, please see Storlazzi et al (2004Storlazzi et al ( , 2009aStorlazzi et al ( , b, 2010 and Bothner et al (2006). Gardner et al (1985) and Gust et al (1996).…”

Section: Study Areamentioning

confidence: 99%

“…Additional STTs were sometimes deployed with z o = 140 cm to evaluate vertical gradients in trap collection rates. An 8-cm high baffle was placed in the top of each tube trap to reduce turbulence and minimize disturbance by aquatic organisms (Bothner et al 2006). Programmable rotating sediment traps (RST) were deployed with z o = 140 cm.…”

Section: Sediment Collectionmentioning

confidence: 99%

“…Thus, for the STTs, there were on average 2160 measurements of oceanographic parameters to compare to one sediment sample, and 108 oceanographic measurements for each of the samples from the RSTs (deployed for *90 days and *4.5 days, respectively). For more information on the sediment traps, oceanographic instruments, or data processing, please see Storlazzi et al (2004Storlazzi et al ( , 2009aStorlazzi et al ( , b, 2010 and Bothner et al (2006).…”

Section: Oceanographic Datamentioning

confidence: 99%

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The use (and misuse) of sediment traps in coral reef environments: theory, observations, and suggested protocols

2010

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Sediment traps are commonly used as standard tools for monitoring ''sedimentation'' in coral reef environments. In much of the literature where sediment traps were used to measure the effects of ''sedimentation'' on corals, it is clear from deployment descriptions and interpretations of the resulting data that information derived from sediment traps has frequently been misinterpreted or misapplied. Despite their widespread use in this setting, sediment traps do not provide quantitative information about ''sedimentation'' on coral surfaces. Traps can provide useful information about the relative magnitude of sediment dynamics if trap deployment standards are used. This conclusion is based first on a brief review of the state of knowledge of sediment trap dynamics, which has primarily focused on traps deployed high above the seabed in relatively deep water, followed by our understanding of near-bed sediment dynamics in shallow-water environments that characterize coral reefs. This overview is followed by the first synthesis of near-bed sediment trap data collected with concurrent hydrodynamic information in coral reef environments. This collective information is utilized to develop nine protocols for using sediment traps in coral reef environments, which focus on trap parameters that researchers can control such as trap height (H), trap mouth diameter (D), the height of the trap mouth above the substrate (z o ), and the spacing between traps. The hydrodynamic behavior of sediment traps and the limitations of data derived from these traps should be forefront when interpreting sediment trap data to infer sediment transport processes in coral reef environments.

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Applying ensemble climate models to predict the fate of marginal coral reefs already existing at thermal and turbidity limits in arid tropical Australia

Cartwright,

Browne,

Fearns

et al. 2024

Climate Resilience

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Marine fauna, including coral reefs, exist under particular oceanographic and meteorological (metocean) processes that maintain water quality within the range limits to which they have adapted over millennia. Climate‐induced changes to these metocean processes could alter ambient marine water quality to ranges beyond those limits and at rates faster than species can adapt. Extreme (or marginal) coral reefs, such as those in arid tropical regions, already exist at the limits of their ranges for water quality parameters such as temperature and turbidity. Here, we apply projected anomalies from ensemble climate models to the metocean processes that drive turbidity in the Exmouth Gulf region of north Western Australia where habitats of significant environmental value exist. We also apply projected sea surface temperature anomalies to look at how a combined effect of turbidity and temperature might impact important habitats. We find that turbidity is predicted to increase in some parts of the Gulf and decrease in others due to differing metocean drivers of turbidity throughout the region. Temperature anomalies reveal year‐round increases in temperature consistent with current summer marine heat wave events (>2.5°C above mean temperatures). Climate models used in the predictions varied between themselves underscoring the importance of model choice and of using ensembles.

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Quantity, composition, and source of sediment collected in sediment traps along the fringing coral reef off Molokai, Hawaii

Cited by 56 publications

References 23 publications

Sedimentation processes in a coral reef embayment: Hanalei Bay, Kauai

Sedimentation processes in a coral reef embayment: Hanalei Bay, Kauai

The use (and misuse) of sediment traps in coral reef environments: theory, observations, and suggested protocols

Applying ensemble climate models to predict the fate of marginal coral reefs already existing at thermal and turbidity limits in arid tropical Australia

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