A5068000833- Ocean Acidification Effects and Responses
- Coral and Marine Ecosystems Studies
- Marine and fisheries research
- Marine and coastal ecosystems
- Geology and Paleoclimatology Research
- Methane Hydrates and Related Phenomena
- Groundwater and Isotope Geochemistry
- Atmospheric and Environmental Gas Dynamics
- Marine Bivalve and Aquaculture Studies
- Isotope Analysis in Ecology
- Flood Risk Assessment and Management
- Coastal and Marine Dynamics
- Marine animal studies overview
- Hydrology and Sediment Transport Processes
- Oceanographic and Atmospheric Processes
- Coastal wetland ecosystem dynamics
- Plant Water Relations and Carbon Dynamics
- Archaeology and ancient environmental studies
- Groundwater flow and contamination studies
- Hydrology and Watershed Management Studies
Southern Cross University
2012-2021
United States Geological Survey
1999-2000
Worldwide, coral reef ecosystems are experiencing increasing pressure from a variety of anthropogenic perturbations including ocean warming and acidification, increased sedimentation, eutrophication, overfishing, which could shift reefs to condition net calcium carbonate (CaCO3) dissolution erosion. Herein, we determine the calcification potential relative balance organic carbon metabolism (net community production; NCP) inorganic calcification; NCC) within 23 locations across globe. In...
Dissolved inorganic carbon, dissolved oxygen, H + , and alkalinity fluxes from permeable carbonate sediments at Heron Island (Great Barrier Reef) were measured over one diel cycle using benthic chambers designed to induce advective pore‐water exchange. A complex hysteretic pattern between precipitation dissolution in sands the aragonite saturation state (Ω Ar ) of overlying chamber water was observed throughout incubations. During day, followed a based on incidence photosynthetically active...
Abstract Some predictions of how ocean acidification (OA) will affect coral reefs assume a linear functional relationship between the ambient seawater aragonite saturation state (Ω ) and net ecosystem calcification (NEC). We quantified NEC in healthy reef lagoon Great Barrier Reef during different times day. Our observations revealed diel hysteresis pattern versus Ω relationship, with peak rates occurring before relatively steady nighttime spite variable . Net production had stronger...
Abstract While the influence of river inputs on coral reef biogeochemistry has been investigated, there is limited information nutrient fluxes related to submarine groundwater discharge (SGD). Here, we investigate whether significant saline groundwater‐derived from bird guano drive photosynthesis and calcification off Heron Island (Great Barrier Reef, Australia). We used multiple experimental approaches including sampling, beach face transects, detailed time series observations assess...
Abstract Automated cavity ring down spectroscopy was used to make continuous measurements of dissolved methane, nitrous oxide, and carbon dioxide in a coral reef lagoon for 2 weeks (Heron Island, Great Barrier Reef). Radon ( 222 Rn) trace the influence tidally driven pore water exchange on greenhouse gas dynamics. Clear tidal variation observed CH 4 , which correlated Rn waters. N O during day only, appears be response coupled nitrification‐denitrification oxic sediments, fueled by nitrate...
Abstract Severe coral bleaching events have affected the GBR causing massive losses of hard cover. Here we use flow respirometry approaches to assess reef net ecosystem calcification (NEC) and production following 2015/2016 event at Lizard Island in northern Great Barrier Reef, a heavily impacted area. Previous studies conducted 2008 2009 (Silverman et al., 2014, http://10.1016/j.gca.2014.09.011 ) were used as preimpact data. Lagrangian Eulerian provided varied results. Estimated NEC (29.1...
Estimates of coral reef ecosystem calcification (Gnet) and productivity (Pnet) provide insight into community health functionality in response to short- long-term stressors such as ocean warming acidification. Here, we investigate spatial variability organic production at One Tree Island (OTI) compare our new observations sporadic metabolic rates reported over the previous 50 years on same flat. Gnet Pnet estimates nearshore site were 50% 166% lower than an offshore with a shift from net...
Abstract Methane (CH 4 ) and nitrous oxide (N 2 O) dynamics in coastal coral reef areas are poorly understood. We measured dissolved carbon dioxide (CO CH (with δ 13 C‐CO C‐CH isotope fractions) N O the Great Barrier Reef (GBR) to determine spatial distributions emissions. CO (379–589 μatm) was oversaturated due calcification riverine sources, as indicated by depleted values. (1.5–13.5 nM) also from nearshore biogenic sources probable offshore aerobic production. (5.5–6.6 generally...
The pond and plug meadow restoration method, used for incised meadows in the Sierra Nevada Range, takes available alluvium on site to dam channel several places. Groundwater storage gained from may alter flow paths surface water availability. Water flowing through is elevated, usually an alternate channel, slowed by floodplain spreading, meanders, vegetation roughness. Each dam, or plug, creates a pond, filled as table rises closer surface. Expanded riparian movement increase...
Gr. scitula (Brady)Gr. truncatulinoides (d'Orbigny) tumida (Brady) ungulata BermudezNeogloboquadrina dutertrei N. pachyderma (Ehrenberg) was separated into leftcoiling and right-coiling categories.Additionally, specimens with >4 chambers in the last whorl that were transitional to large typical forms of counted under informal category "dupac."and considered be between pachyderma. Sphaeroidinella dehiscens (Parker