scholarly journals Hydrologic Restoration of the Lac des Allemands Swamp, Barataria, Louisiana

Forests ◽  
2021 ◽  
Vol 12 (8) ◽  
pp. 1074
Author(s):  
Gary P. Shaffer ◽  
Demetra Kandalepas ◽  
Nicholas Stevens ◽  
Tessera Crockett ◽  
Glen Curole
Keyword(s):  
Forested Wetlands ◽  
Cost Effective ◽  
Landscape Restoration ◽  
Flood Duration ◽  
Barataria Basin ◽  
Hydrologic Restoration ◽  
Aboveground Production ◽  
Spoil Bank ◽  
Restoration Method ◽  
Coastal Louisiana

Most of the forested wetlands of coastal Louisiana are in decline, primarily due to impoundment and increased flood duration. The Lac des Allemands swamp of Barataria Basin was a prime example of prolonged inundation prior to hydrologic restoration completed in February of 2018; the swamp had been impounded for over 60 years. To characterize restoration benefits, eight paired 625 m2 permanent sites were established close to and halfway between eight 30 m × 122 m gaps cut into the spoil bank of Bayou Chevreuil. During 2018, canopy closure increased by 20%. In addition, aboveground production of wood and leaves increased over 2017 from 2018–2020. Furthermore, natural regeneration has occurred annually and many of the seedlings are now approximately 1 m tall. In conclusion, hydrologic restoration of impounded wetlands in coastal Louisiana is an extremely cost-effective landscape restoration method.

Aboveground Production of Seven Marsh Plant Species in Coastal Louisiana

Ecology ◽  
1978 ◽  
Vol 59 (4) ◽  
pp. 760-769 ◽  
Author(s):  
Charles S. Hopkinson ◽  
James G. Gosselink ◽  
Rolando T. Parrando
Keyword(s):  
Plant Species ◽  
Marsh Plant ◽  
Aboveground Production ◽  
Coastal Louisiana

High-resolution mapping of biomass and distribution of marsh and forested wetlands in southeastern coastal Louisiana

2019 ◽  
Vol 80 ◽  
pp. 257-267 ◽  
Author(s):  
Nathan Thomas ◽  
Marc Simard ◽  
Edward Castañeda-Moya ◽  
Kristin Byrd ◽  
Lisamarie Windham-Myers ◽  
...  
Keyword(s):  
High Resolution ◽  
Forested Wetlands ◽  
High Resolution Mapping ◽  
Resolution Mapping ◽  
Coastal Louisiana

scholarly journals A meta-analysis of the ecological and economic outcomes of mangrove restoration

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
Jie Su ◽  
Daniel A. Friess ◽  
Alexandros Gasparatos
Keyword(s):  
Meta Analysis ◽  
Cost Effective ◽  
Economic Benefits ◽  
Ecosystem Functions ◽  
Mangrove Restoration ◽  
Effective Form ◽  
Policy Objectives ◽  
Restoration Method ◽  
Benefit Cost ◽  
Change Mitigation

AbstractMangrove restoration has become a popular strategy to ensure the critical functions and economic benefits of this ecosystem. This study conducts a meta-analysis of the peer-reviewed literature on the outcomes of mangrove restoration. On aggregate, restored mangroves provide higher ecosystem functions than unvegetated tidal flats but lower than natural mangrove stands (respectively RR’ = 0.43, 95%CIs = 0.23 to 0.63; RR’ = −0.21, 95%CIs = −0.34 to −0.08), while they perform on par with naturally-regenerated mangroves and degraded mangroves. However, restoration outcomes vary widely between functions and comparative bases, and are mediated by factors such as restoration age, species, and restoration method. Furthermore, mangrove restoration offers positive benefit-cost ratios ranging from 10.50 to 6.83 under variable discount rates (−2% to 8%), suggesting that mangrove restoration is a cost-effective form of ecosystem management. Overall, the results suggest that mangrove restoration has substantial potential to contribute to multiple policy objectives related to biodiversity conservation, climate change mitigation and sustainable development.

scholarly journals Aboveground production and nutrient circulation along a flooding gradient in a South Carolina Coastal Plain forest

1999 ◽  
Vol 29 (9) ◽  
pp. 1402-1418 ◽  
Author(s):  
Marianne K Burke ◽  
B Graeme Lockaby ◽  
William H Conner
Keyword(s):  
South Carolina ◽  
Net Primary Production ◽  
Nutrient Use Efficiency ◽  
Nutrient Deficiency ◽  
Clay Content ◽  
Forested Wetlands ◽  
Growth Efficiency ◽  
Soil P ◽  
Transition Zones ◽  
Aboveground Production

Relative to effects of flooding, little is known about the influence of hydrology-nutrient interactions on aboveground net primary production (NPP) in forested wetlands. We found that nutrient circulation and NPP were closely related along a complex physical, chemical, and hydrologic gradient in a bottomland hardwood forest with four distinct communities. Aboveground biomass, NPP, biomass partitioning to stem production, growth efficiency, and soil macronutrient availability were greatest in the flooded zone, possibly because of the stable hydrologic regime. In the wet transition zone, trees were least productive, nutrient use efficiency was highest, and N retranslocation from foliage before abscission was "complete." Wet and dry transition zones had the lowest litterfall quality. Soil organic matter was negatively correlated with extractable NH4-N plus NO3-N before in situ incubations and positively correlated with litterfall lignin/N ratios. Lignin/P and C/N ratios were positively correlated with exchangeable soil Ca and Mg, cation exchange capacity, and clay content and negatively correlated with extractable soil P. We concluded that periodic flooding and associated widely fluctuating soil chemistry resulted in disequilibrium between the plant community and environmental conditions, which led to nutrient deficiency and low NPP in the transition zones compared with the continuously flooded and mesic zones.

scholarly journals Community-based, low-tech method of restoring a lost thicket of Acropora corals

2014 ◽  
Vol 71 (7) ◽  
pp. 1866-1875 ◽  
Author(s):  
Dexter W. dela Cruz ◽  
Ronald D. Villanueva ◽  
Maria Vanessa B. Baria
Keyword(s):  
Community Involvement ◽  
Coral Species ◽  
Coral Cover ◽  
Cost Effective ◽  
Fold Increase ◽  
Coral Rubble ◽  
Barren Area ◽  
Unconsolidated Sand ◽  
Blast Fishing ◽  
Restoration Method

Abstract Due to unregulated blast fishing and episodic bleaching events, the back-reef zone near Barangay Lucero in Bolinao, Pangasinan, Philippines, was reduced to a barren area of unconsolidated sand and coral rubble. Anecdotal accounts from local inhabitants, scientific reports, and examination of rubble on the substratum revealed that the area had been dominated by staghorn Acropora corals prior to degradation. With no significant signs of natural recovery, a low-tech restoration method that is both transferable to the community and cost-effective was devised and implemented. Through the help of local inhabitants, 450 fragments of two staghorn coral species (Acropora intermedia and A. pulchra) were transplanted, without using SCUBA equipment, in a total of six 4 × 4 m plots. There were two transplant density treatments: low and high, receiving 25 and 50 fragments of each coral species, respectively. Survivorship and growth of transplants, as well as the assemblage of fishes and macroinvertebrates inside the transplantation and control plots, were monitored periodically for up to 19 months. Transplant survivorship was generally high (68–89%) at the end of the study. There was also an average of a 15-fold increase in ecological volume of the transplants (from 1784.25 ± 162.75 to 26 540.765 ± 4547.25 cm3). Consequently, a significantly higher number of fish and of macroinvertebrates was recorded inside the transplantation plots than in the control plots, indicating signs of restoration success with the reintroduction of the two coral species. Exhibiting significant differences in coral cover, fish biomass and abundance, high-density is more cost-effective than low-density treatment, attaining optimal effects on key reef recovery parameters. The total cost of restoring a thicket of Acropora in a sandy-rubble field using this low-tech rehabilitation method with community participation was estimated to be US$9198.40 ha−1 (US$0.90 m−2), and thus ∼60% cheaper than without community involvement. Community involvement not only reduced the cost of the restoration activity but also provided the community with a sense of ownership and responsibility for their resources, thus ensuring the long-term success of the intervention.

scholarly journals Salinity and Marine Mammal Dynamics in Barataria Basin: Historic Patterns and Modeled Diversion Scenarios

Water ◽  
2018 ◽  
Vol 10 (8) ◽  
pp. 1015 ◽  
Author(s):  
Eric White ◽  
Francesca Messina ◽  
Leland Moss ◽  
Ehab Meselhe
Keyword(s):  
Mississippi River ◽  
Spatial Scales ◽  
Bottlenose Dolphins ◽  
Compartment Model ◽  
Hydrodynamic Models ◽  
Sea Levels ◽  
Barataria Basin ◽  
Freshwater Diversion ◽  
Coastal Louisiana ◽  
The Impact

Understanding spatiotemporal patterns of salinity in Barataria Basin in coastal Louisiana is important to better understand and manage operations of existing and proposed freshwater and sediment diversions from the Mississippi River into the estuary. In this study, a comprehensive salinity dataset was compiled which covered the entire basin and included data from 1990 through 2015. The data were aggregated into daily mean salinity timeseries across Barataria Basin at a variety of spatial scales and used to analyze historic patterns. Simulations were conducted with two hydrodynamic models, the Integrated Compartment Model (ICM) and Delft3D. The Delft3D model output was overlaid with observed geo-tagged locations of bottlenose dolphins that were sampled from the southwest quadrant of the basin. The ICM simulations were used to assess the impact of existing freshwater and proposed sediment diversion projects which reintroduce riverine water into the estuary. The salinity in the uppermost portions of the basin is sensitive primarily to the existing freshwater diversion, whereas additional flows from a proposed sediment diversion result in additional freshening. The lowermost region of the basin is most sensitive to the proposed sediment diversion; however, the magnitude varies by diverted flow volumes and assumed sea levels in the Gulf of Mexico.

scholarly journals A new large‐scale and cost‐effective restoration method for cold‐water coral gardens

2020 ◽  
Vol 30 (5) ◽  
pp. 977-987 ◽  
Author(s):  
Maria Montseny ◽  
Cristina Linares ◽  
Núria Viladrich ◽  
Pol Capdevila ◽  
Stefano Ambroso ◽  
...  
Keyword(s):  
Large Scale ◽  
Cold Water ◽  
Cost Effective ◽  
Restoration Method ◽  
Water Coral

scholarly journals A Review of 50 Years of Study of Hydrology, Wetland Dynamics, Aquatic Metabolism, Water Quality and Trophic Status, and Nutrient Biogeochemistry in the Barataria Basin, Mississippi Delta—System Functioning, Human Impacts and Restoration Approaches

Water ◽  
2021 ◽  
Vol 13 (5) ◽  
pp. 642 ◽  
Author(s):  
John W. Day ◽  
William H. Conner ◽  
Ronald D. DeLaune ◽  
Charles S. Hopkinson ◽  
Rachael G. Hunter ◽  
...  
Keyword(s):  
Water Quality ◽  
Mississippi Delta ◽  
Human Impacts ◽  
Forested Wetlands ◽  
Wetland Loss ◽  
Water Levels ◽  
Nutrient Concentrations ◽  
Island Restoration ◽  
Barataria Basin ◽  
System Functioning

Here we review an extensive series of studies of Barataria Basin, an economically and ecologically important coastal basin of the Mississippi Delta. Human activity has greatly altered the hydrology of the basin by decreasing riverine inflows from leveeing of the river and its distributaries, increasing runoff with high nutrient concentrations from agricultural fields, and channelization of wetlands of the basin interior that has altered flow paths to often bypass wetlands. This has resulted in degraded water quality in the upper basin and wetland loss in the lower basin. Trophic state analysis found the upper basin to be eutrophic and the lower basin to be mesotrophic. Gross aquatic primary production (GAPP) was highest in the upper basin, lowest in the mid basin, and intermediate in the lower basin. Forested wetlands in the upper basin have degraded over the past several decades due to increased periods of flooding, while there has been massive loss of emergent wetlands in the lower basin due to increasing water levels and pervasive alteration of hydrology. Restoration will entail reconnection of waterways with surrounding wetlands in the upper basin, and implementation of river sediment diversions, marsh creation using dredged sediments and barrier island restoration. Findings from this review are discussed in terms of the functioning of deltas globally.

The application of electron microscopy to diagnosis in gynecologic neoplasms and tumor-like conditions

1984 ◽  
Vol 42 ◽  
pp. 102-105
Author(s):  
Lawrence M. Roth
Keyword(s):  
Electron Microscopy ◽  
Reproductive Tract ◽  
Malignant Tumors ◽  
Frozen Section ◽  
Cost Effective ◽  
Female Reproductive Tract ◽  
Ultrastructural Examination ◽  
Specific Diagnosis ◽  
Potential Value ◽  
Gynecologic Neoplasms

The female reproductive tract may be the site of a wide variety of benign and malignant tumors, as well as non-neoplastic tumor-like conditions, most of which can be diagnosed by light microscopic examination including special stains and more recently immunoperoxidase techniques. Nevertheless there are situations where ultrastructural examination can contribute substantially to an accurate and specific diagnosis. It is my opinion that electron microscopy can be of greatest benefit and is most cost effective when applied in conjunction with other methodologies. Thus, I have developed an approach which has proved useful for me and may have benefit for others. In cases where it is deemed of potential value, glutaraldehyde-fixed material is obtained at the time of frozen section or otherwise at operation. Coordination with the gynecologic oncologist is required in the latter situation. This material is processed and blocked and is available if a future need arises.

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