Evaluation of Mn and Fe in coral skeletons (Porites spp.) as proxies for sediment loading and reconstruction of 50 yrs of land use on Ishigaki Island, Japan

Inoue, Mayuri; Ishikawa, Daisaku; Miyaji, Tsuzumi; Yamazaki, Atsuko; Suzuki, Atsushi; Yamano, Hiroya; Kawahata, Hodaka; Watanabe, Tsuyoshi

doi:10.1007/s00338-014-1128-3

Cited by 26 publications

(10 citation statements)

References 51 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…While the biological consequences of storm‐induced run‐off have been investigated for corals and fish species in Okinawa (Hongo and Yamano, 2013; Inoue et al ., 2014; Yamazaki et al ., 2015; O'Connor et al ., 2016; Yamano and Watanabe, 2016), less is known about how tropical cyclones and associated run‐off affects coastal microbial communities and especially bacteria (Blanco et al ., 2008). Microbial communities contribute to marine ecosystems through primary production and by recycling dissolved organic carbon and nutrients through the microbial loop (Azam et al ., 1983), but can also draw down dissolved oxygen (Anderson and Taylor, 2001) or cause opportunistic infections in marine organisms (Shinn et al ., 2000; Sutherland et al ., 2011; Sheridan et al ., 2014; Peters, 2015).…”

Section: Introductionmentioning

confidence: 99%

Extreme storms cause rapid but short‐lived shifts in nearshore subtropical bacterial communities

Ares

Brisbin

Sato

et al. 2020

Environmental Microbiology

View full text Add to dashboard Cite

Summary Climate change scenarios predict tropical cyclones will increase in both frequency and intensity, which will escalate the amount of terrestrial run‐off and mechanical disruption affecting coastal ecosystems. Bacteria are key contributors to ecosystem functioning, but relatively little is known about how they respond to extreme storm events, particularly in nearshore subtropical regions. In this study, we combine field observations and mesocosm experiments to assess bacterial community dynamics and changes in physicochemical properties during early‐ and late‐season tropical cyclones affecting Okinawa, Japan. Storms caused large and fast influxes of freshwater and terrestrial sediment – locally known as red soil pollution – and caused moderate increases of macronutrients, especially SiO2 and PO43−, with up to 25 and 0.5 μM respectively. We detected shifts in relative abundances of marine and terrestrially derived bacteria, including putative coral and human pathogens, during storm events. Soil input alone did not substantially affect marine bacterial communities in mesocosms, indicating that other components of run‐off or other storm effects likely exert a larger influence on bacterial communities. The storm effects were short‐lived and bacterial communities quickly recovered following both storm events. The early‐ and late‐season storms caused different physicochemical and bacterial community changes, demonstrating the context‐dependency of extreme storm responses in a subtropical coastal ecosystem.

show abstract

Section: Introductionmentioning

confidence: 99%

Extreme storms cause rapid but short‐lived shifts in nearshore subtropical bacterial communities

Ares

Brisbin

Sato

et al. 2020

Environmental Microbiology

View full text Add to dashboard Cite

show abstract

“…The organic stable carbon isotopic ratio (δ 13 C org ) is generally used as a proxy for nutrient carriers and time-integrated environmental conditions 18,19 . Trace elements, including heavy metals, in coral skeletons have been used as proxies for sediment loading and anthropogenic land use 20,21 . These various proxy measures in coral skeletons record the environmental changes caused by global climate change and local anthropogenic activity.…”

mentioning

confidence: 99%

Anthropogenic Anoxic History of the Tuvalu Atoll Recorded as Annual Black Bands in Coral

Nakamura

Takahashi

Sunamura

et al. 2020

Sci Rep

Self Cite

View full text Add to dashboard Cite

Atoll islands are small, low-lying and highly vulnerable to sea level rise (SLR). Because these islands are fully composed of the skeletons from coral reef creatures, the healthy coral ecosystem plays a pivotal role in island resilience against SLR. The environmental deterioration of reefs caused by increases in the human population has been recently reported, but the timing and process are unknown. We investigated the annual black bands in a coral boring core from Fongafale Island, the capital of Tuvalu, which is a symbolic atoll country that is being submerged due to SLR. The iron redox state and microbial gene segments in the coral skeleton might be new environmental indicators that reveal the linkage between anthropogenic activity and coral reef ecosystems. Our findings provide the first demonstration that iron sulfide has formed concentrated black layers since 1991 under the seasonal anoxic conditions inside coral annual bands. Since the 1990s, increasing human activity and domestic waste-induced eutrophication has promoted sludge and/or turf algae proliferation with the subsequent seasonal destruction, resulting in sulfate reduction by anaerobic bacteria. With the recent climate variability, these anthropogenic effects have induced the mass mortality of branching corals, deteriorated the coral reef ecosystem and deprived the resilience of the island against SLR.

show abstract

“…In fact, there is little evidence that the health of Bramston Reef has changed over the past 150 years [39], although the fringing reef in the south of Stone Island (SI-S) appears to have declined since European settlement, potentially as a result of localised sediment erosion from the island catchment [45]. Future research in this space would benefit from combining geomorphological Holocene records of reef development and sediment input with more recent records of coral growth (linear extension and calcification) [77] and geochemical analyses of Porites coral skeletons as proxy records for sediment and nutrient input (e.g., [33,78,79]) that extend from pre-European settlement to the present. Such records would be extremely valuable in understanding anthropogenic effects on nearshore fringing reefs.…”

Section: Evidence For Changes In Disturbance Regimes Since European Smentioning

confidence: 99%

The Variable Influences of Sea Level, Sedimentation and Exposure on Holocene Reef Development over a Cross-Shelf Transect, Central Great Barrier Reef

et al. 2018

View full text Add to dashboard Cite

Coral reefs globally are impacted by natural and anthropogenic stressors that are compounded by climate change. Understanding past reef responses to natural stressors (cyclones, sea-level change, freshwater inputs, and sedimentation) can provide important insights to further understand recent (within the past century) trends in coral cover and diversity. Here we use a compilation of recently published data to investigate the Holocene development of five fringing reefs that are located on a cross-shelf transect on the central Great Barrier Reef, and that are exposed to varying degrees of natural and anthropogenic sedimentation, storm exposure, and Holocene sea-level change. Forty-two reef cores collected using a combination of manual percussion coring and hydraulic drilling techniques, were analysed and dated using uranium-thorium methods. The chronostratigraphic records of reef development established using 105 recently published radiometric ages and seven new uranium-thorium ages from the reef cores and fossil microatolls preserved across the reef flats were compared to investigate cross-shelf variations in reef development. This is the first study to conduct an internal investigation of reef framework across an inshore–offshore gradient to examine the varying levels of influence of sedimentation, sea level and cyclones. Our observations from the central Great Barrier Reef show that reefs furthest offshore from the mainland coast were typically initiated earliest after the post-glacial marine transgression. Reef flat size, morphology, and growth style varied according to constraints placed on reef development by the composition, depth, shape, and relief of the underlying substrate. We establish that terrigenous sedimentation had a marked effect on the development of inshore reefs closest to the mainland (within 10 km of the mainland coast). Periods of relatively high terrigenous sedimentation correspond with enhanced reef accretion rates, and also resulted in a superior record of palaeo-ecological coral composition (i.e., better preservation) at inshore sites. In contrast, mid-Holocene cyclones played a seemingly more important role in the development of reefs >10 km from the mainland; although cyclones clearly affect reefs closer inshore, their geomorphology is affected by a range of controlling factors. Insights provided by these five Holocene reef chronostratigraphies provide useful baseline understanding of reef condition and growth along a cross-shelf transect where the reefs are exposed to variable stressors.

show abstract

Evaluation of Mn and Fe in coral skeletons (Porites spp.) as proxies for sediment loading and reconstruction of 50 yrs of land use on Ishigaki Island, Japan

Cited by 26 publications

References 51 publications

Extreme storms cause rapid but short‐lived shifts in nearshore subtropical bacterial communities

Extreme storms cause rapid but short‐lived shifts in nearshore subtropical bacterial communities

Anthropogenic Anoxic History of the Tuvalu Atoll Recorded as Annual Black Bands in Coral

The Variable Influences of Sea Level, Sedimentation and Exposure on Holocene Reef Development over a Cross-Shelf Transect, Central Great Barrier Reef

Contact Info

Product

Resources

About