Relationship of biological communities to habitat structure on the largest remnant flat oyster reef (Ostrea angasi) in Australia

2020 ◽  
Vol 71 (8) ◽  
pp. 972 ◽  
Author(s):  
C. Crawford ◽  
G. Edgar ◽  
C. L. Gillies ◽  
G. Heller-Wagner
Keyword(s):  
Oyster Reef ◽  
Three Dimensional ◽  
Soft Sediment ◽  
Oyster Reefs ◽  
Biological Communities ◽  
Reef Restoration ◽  
Naturally Occurring ◽  
Faunal Abundance ◽  
North Eastern ◽  
Relationship Of

Oyster reef restoration is a growing field in Australia, yet formal descriptions of associated biological communities for reefs created by native flat oysters (Ostrea angasi) do not currently exist. Native flat oysters once formed extensive and complex three-dimensional habitats in bays and estuaries across southern Australia until indiscriminate fishing, sedimentation and disease led to their near disappearance. To determine the diversity and abundance on naturally occurring oyster reefs, we sampled four sites on the last known naturally occurring oyster reef ecosystem, which resides in north-eastern Tasmania, and compared them to the surrounding soft sediment regions. Assemblages were related to environmental variables to determine whether consistent patterns were present. Oyster reef sites contained three times the faunal abundance of the surrounding soft sediment regions. Abundance among echinoderms, arthropods, molluscs and fish was much elevated, whereas annelids showed similar levels of abundance but differed in terms of species composition. These results show that oyster reefs do support abundant and diverse assemblages, emphasising the probable loss of community-level biodiversity associated with their historical decline around southern Australia.

Habitat value of Sydney rock oyster (Saccostrea glomerata) reefs on soft sediments

2020 ◽  
Vol 71 (7) ◽  
pp. 771 ◽  
Author(s):  
I. M. McLeod ◽  
L. Boström-Einarsson ◽  
C. Creighton ◽  
B. D'Anastasi ◽  
B. Diggles ◽  
...  
Keyword(s):  
Coastal Waters ◽  
Oyster Reef ◽  
Economic Value ◽  
Biomass Productivity ◽  
Macroinvertebrate Communities ◽  
Oyster Reefs ◽  
Reef Restoration ◽  
Habitat Value ◽  
Rock Oyster ◽  
Saccostrea Glomerata

Estimates of the ecological and economic value of ecosystems can provide important information for the prioritisation of conservation and restoration actions. Oyster reefs that were once common in temperate coastal waters have now been largely degraded or lost. Oyster reefs provide a suite of ecological services, including habitat and a food supply for a range of other species. In Australia, there is growing interest in oyster reef restoration, but there are knowledge gaps with regard to their structure and habitat value. Here, we describe the structure of eight remnant Sydney rock oyster (Saccostrea glomerata) reefs and estimate the density, biomass, productivity and composition of mobile macroinvertebrate and infaunal communities associated with them. The oyster reefs had a distinct assemblage of macroinvertebrates, with fivefold higher density of larger (≥2mm) macroinvertebrates, fivefold higher biomass and almost fivefold higher productivity, than that of adjacent bare sediments. The productivity of infaunal communities was twice as high under oyster reefs than in adjacent bare sediments. Therefore, S. glomerata reef restoration is likely to provide important habitat for macroinvertebrate communities and boost local secondary production.

scholarly journals A Resident Fish Guild as a Higher Trophic Level Indicator of Oyster Reef Restoration Success

2021 ◽  
Vol 13 (23) ◽  
pp. 13004
Author(s):  
Dakota M. Lewis ◽  
Katie E. Durham ◽  
Linda J. Walters ◽  
Geoffrey S. Cook
Keyword(s):  
Reef Fish ◽  
Trophic Level ◽  
Oyster Reef ◽  
Foundation Species ◽  
Oyster Reefs ◽  
Anthropogenic Pressures ◽  
Level Indicator ◽  
Reef Restoration ◽  
Restoration Success ◽  
Oyster Restoration

Eastern oysters (Crassostrea virginica) are critical foundation species in estuarine waters, but due to a combination of natural and anthropogenic pressures, oyster abundance has declined. Restoring oyster reefs and monitoring restoration success often focuses on oyster metrics, but relatively infrequently, responses of higher trophic level species and the production of related ecosystem services are accounted for. To address this, we compare the response of a resident reef fish guild (gobies, blennies, toadfish) to standard metrics of oyster restoration success. Using lift nets and seines, natural and restored reefs were monitored over a two-year period within Mosquito Lagoon, Florida, USA. Standard metrics are indicative of restoration success; live oyster density and reef thickness increased in restored reefs after 12 and 24 months. Combined, live oyster density and reef thickness were the best predictors of annual resident reef fish abundance compared to water quality metrics. These results suggest that the benefits of restoring oyster reef habitat are conferred to broader components of the food web, with benefits accruing to reef resident fishes that are a key trophic linkage between lower trophic level foundation species and higher trophic level predators inhabiting coastal ecosystems.

scholarly journals Contemporary Oyster Reef Restoration: Responding to a Changing World

2021 ◽  
Vol 9 ◽  
Author(s):  
Alice H. Howie ◽  
Melanie J. Bishop
Keyword(s):  
Oyster Reef ◽  
Water Filtration ◽  
Oyster Reefs ◽  
Reef Restoration ◽  
Design Considerations ◽  
Road Map ◽  
Shoreline Protection ◽  
Novel Approaches ◽  
Selection Of ◽  
Growth And Reproduction

Globally, there is growing interest in restoring previously widespread oyster reefs to reinstate key ecosystem services such as shoreline protection, fisheries productivity and water filtration. Yet, since peak expiration of oysters in the 1800s, significant and ongoing environmental change has occurred. Estuaries and coasts are undergoing some of the highest rates of urbanization, warming and ocean acidification on the planet, necessitating novel approaches to restoration. Here, we review key design considerations for oyster reef restoration projects that maximize the probability that they will meet biological and socio-economic goals not only under present-day conditions, but into the future. This includes selection of sites, and where required, substrates and oyster species and genotypes for seeding, not only on the basis of their present and future suitability in supporting oyster survival, growth and reproduction, but also based on their match to specific goals of ecosystem service delivery. Based on this review, we provide a road map of design considerations to maximize the success of future restoration projects.

scholarly journals The Relationship of Intradialytic Hypotension and Acute Effects of Hemodialysis on Heart: A Three‐dimensional Speckle Tracking Echocardiographic Study

2021 ◽  
Author(s):  
Hakan Kosku ◽  
Cansin Tulunay Kaya ◽  
Hasan Selim Guler ◽  
Muge Akbulut ◽  
Merve Aktar ◽  
...  
Keyword(s):  
Speckle Tracking ◽  
Three Dimensional ◽  
Intradialytic Hypotension ◽  
Acute Effects ◽  
Echocardiographic Study ◽  
Relationship Of ◽  
The Relationship

A comparative study and combined application of RSM and ANN in adsorptive removal of diuron using biomass ashes

2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Sunil K. Deokar ◽  
Nachiket A. Gokhale ◽  
Sachin A. Mandavgane
Keyword(s):  
Three Dimensional ◽  
Current Approach ◽  
Coefficient Of Determination ◽  
Ann Model ◽  
Operational Parameters ◽  
Initial Concentration ◽  
Combined Application ◽  
Artificial Neural Network Ann ◽  
Relationship Of ◽  
Biomass Ashes

Abstract Biomass ashes like rice husk ash (RHA), bagasse fly ash (BFA), were used for aqueous phase removal of a pesticide, diuron. Response surface methodology (RSM) and artificial neural network (ANN) were successfully applied to estimate and optimize the conditions for the maximum diuron adsorption using biomass ashes. The effect of operational parameters such as initial concentration (10–30 mg/L); contact time (0.93–16.07 h) and adsorbent dosage (20–308 mg) on adsorption were studied using central composite design (CCD) matrix. Same design was also employed to gain a training set for ANN. The maximum diuron removal of 88.95 and 99.78% was obtained at initial concentration of 15 mg/L, time of 12 h, RHA dosage of 250 mg and at initial concentration of 14 mg/L, time of 13 h, BFA dosage of 60 mg respectively. Estimation of coefficient of determination (R 2) and mean errors obtained for ANN and RSM (R 2 RHA = 0.976, R 2 BFA = 0.943) proved ANN (R 2 RHA = 0.997, R 2 BFA = 0.982) fits better. By employing RSM coupled with ANN model, the qualitative and quantitative activity relationship of experimental data was visualized in three dimensional spaces. The current approach will be instrumental in providing quick preliminary estimations in process and product development.

A Research on the Morphology and Composition of Flocs (Part 1: Floc Breaage Disregarded)

2013 ◽  
Vol 726-731 ◽  
pp. 1566-1572 ◽  
Author(s):  
Shi Qiang Ding ◽  
Qing Na Li ◽  
Xin Rong Pang ◽  
Ji Run Xu
Keyword(s):  
Dimensional Space ◽  
Three Dimensional ◽  
New Classification ◽  
Suspension Viscosity ◽  
Primary Particles ◽  
Long Time ◽  
Relationship Of ◽  
The Relationship ◽  
Three Dimensional Space ◽  
Floc Breakage

The characteristics of flocs aggregated in flocculation have been paid more and more attention for a long time. In this paper, a new classification and analyses method dealing with the flocs is developed. The flocs formed after flocculation is divided into four kinds, including the left primary particles, linear flocs with all component particles in a line, planar flocs with all component particles on a plane and volumetric flocs with all component particles in a three-dimensional space. By analyzing the formation approaches of different kind of flocs regardless of the floc breakage, the number of every kind of floc is analyzed to be related with the suspension concentration mathematically. After comparing the different items in the models describing the relationship of floc number and concentration, a series of simplified expressions are presented. Lastly, a mathematical equation relating the measurable suspension viscosity with the numbers of different flocs is obtained.

High-resolution transmission electron microscopic investigations of molybdenum thin films on faceted α-Al2O3

2005 ◽  
Vol 38 (2) ◽  
pp. 260-265 ◽  
Author(s):  
Leonore Wiehl ◽  
Jens Oster ◽  
Michael Huth
Keyword(s):  
High Resolution ◽  
Three Dimensional ◽  
Epitaxial Relationship ◽  
Electron Microscopic ◽  
Force Microscopy ◽  
Atomic Force ◽  
Transmission Electron ◽  
High Resolution Images ◽  
Α Al2o3 ◽  
Relationship Of

Epitaxially grown Mo films on a faceted corundum (α-Al2O3)mplane were investigated by transmission electron microscopy. Low- and high-resolution images were taken from a cross-section specimen cut perpendicular to the facets. It was possible to identify unambiguously the crystallographic orientation of these facets and explain the considerable deviation (∼10°) of the experimental interfacet angle, as measured with atomic force microscopy (AFM), from the expected value. For the first time, proof is given for a smooth \{10\bar{1}1\} facet and a curvy facet with orientation near to \{10\bar{1}\bar{2}\}. Moreover, the three-dimensional epitaxial relationship of an Mo film on a faceted corundummsurface was determined.

Changes in Sediment Characteristics upon Oyster Reef Restoration, NE Florida, USA

2017 ◽  
Vol 20 (1) ◽  
Author(s):  
Melissa W Southwell ◽  
Jessica J Veenstra ◽  
Charles D Adams ◽  
Elizabeth V Scarlett ◽  
Kristy B Payne
Keyword(s):  
Oyster Reef ◽  
Sediment Characteristics ◽  
Reef Restoration
Sign in / Sign up

Export Citation Format

Share Document