The Effects of Dock Shading on the Seagrass Halodule wrightii in Perdido Bay, Alabama

Shafer, Deborah J.

doi:10.2307/1353073

Cited by 46 publications

(40 citation statements)

References 22 publications

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“…Far less is known about the magnitude and distribution of impacts by recreational activities and boating, but a few infrequent researches support our conjecture (Burdick and Short, 1999;Shaefer, 1999;Eriksson et al, 2004). Eriksson et al (2004) concluded that both recreational boating activities and traffic by medium sized ferryboats might cause significant changes in community composition and have significant negative effects on species richness at greater depth.…”

Section: Disscussionsupporting

confidence: 73%

Development of the microbial communities in lake donghu in relation to water quality

Jiang

Shen

2006

Environ Monit Assess

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There is increasing recognition that protozoa is very useful in monitoring and evaluating water ecological healthy and quality. In order to study the relationship between structure and function of protozoan communities and water qualities, six sampling stations were set on Lake Donghu, a hypereutrophic subtropical Chinese lake. Microbial communities and protists sampling from the six stations was conducted by PFU (Polyurethane foam unit) method. Species number (S), diversity index (DI), percentage of phytomastigophra, community pollution value (CPV), community similarity and heterophy index (HI) were mensurated. The measured indicators of water quality included total phosphorus (TP), dissolved oxygen (DO), Chemical oxygen demand (COD), NH 4 + , NO 2 − and NO 3 − . Every month water samples from stations I, II, III, IV were chemically analyzed for a whole year, Among the chemically analyzed stations, station I was the most heavily polluted, station II was the next, stations III and IV had similar pollution degrees. The variable tendencies of COD, TP, NH 3 , NO 2 − , NO 3 − , and DO during the year was approximately coincident among the six stations. Analysis from the community parameters showed that the pollution of station 0 was much more serious than others, and station V was the most slight. Of the community parameters, CPV and HI were sensitive in reflecting the variables of the water quality. Community similarity index was also sensitive in dividing water qualities and the water quality status of different stations could be correctly classified by the cluster analysis. DI could reflect the tendency of water quality gradient, species number and percentage of Phytomastigophora was not obvious in indicating the water quality gradient.

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Section: Disscussionsupporting

confidence: 73%

Development of the microbial communities in lake donghu in relation to water quality

Jiang

Shen

2006

Environ Monit Assess

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“…Seagrass (Halodule wrightii) biomass below docks in Perdido Bay (Alabama, USA) was 67-70% of the values recorded in areas without docks (Shafer, 1999).…”

Section: Introductionmentioning

confidence: 92%

“…in Alabama (USA) quantified the amount of light reduction due to dock shading (Shafer, 1999). The amount of light H. wrightii received was critical to seagrass survival: seagrass was not present under docks where light levels were less than 14% surface irradiance.…”

Section: An Examination Of the Impacts Of Dock Shading On The Seagrasmentioning

confidence: 99%

“…H. wrightii were not present under docks where light levels were less than 14% surface irradiance (Shafer, 1999). The effect of shading was greatest between 1000 h and 1500 h, and seagrasses subject to additional shading during the morning and late afternoon due to dock height and orientation were particularly vulnerable to effects of shading (Shafer, 1999). Seagrass and sediment in the vicinity of docks are affected through boat propeller scarring (Shafer, 1999;Burdick and Short, 1999).…”

Section: Introductionmentioning

confidence: 99%

“…The effect of shading was greatest between 1000 h and 1500 h, and seagrasses subject to additional shading during the morning and late afternoon due to dock height and orientation were particularly vulnerable to effects of shading (Shafer, 1999). Seagrass and sediment in the vicinity of docks are affected through boat propeller scarring (Shafer, 1999;Burdick and Short, 1999). A cumulative assessment of dock impacts in Waquoit Bay (Massachusetts, USA) found that docks shaded less than 1% of total seagrass area in the Bay.…”

Section: Introductionmentioning

confidence: 99%

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Impacts of docks on seagrass and effects of management practices to ameliorate these impacts

Gladstone

Courtenay

2014

Estuarine, Coastal and Shelf Science

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Seagrasses have high conservation and human-use values, but around the world they are being damaged by human activities. Compared to the larger spatial scale at which some human activities affect estuaries and their seagrasses (e.g. catchment disturbance, dredging, pollution, trawling), recreational boating and infrastructure of moorings and docks act at smaller scales. However, the cumulative effects contribute to stresses acting on seagrass beds. This study assessed the effects of docks on the native seagrass Zostera muelleri subsp. capricorni in an estuary in south-east Australia and of current management practices designed to reduce dock impacts on this seagrass. A field survey found that seagrass biomass was significantly reduced below docks, and the effects were not influenced by dock orientation. Management practices requiring the use of a mesh decking to provide greater light penetration reduced, but did not eliminate, the reduction in seagrass biomass caused by docks. A modified beyond BACI experiment provided evidence for a causal link between the installation of wooden or mesh docks and reductions in biomass of seagrass. The reduction in biomass was apparent 6 mo after dock installation, and by 26 mo seagrass biomass had declined by at least 90%.Faced with increasing coastal populations, increases in recreational use, and continued pressures from other human activities, alternative management practices that further minimize the effects of docks are needed.

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The influence of seagrass donor source on small‐scale transplant resilience

McDonald

Christiaen

Major

et al. 2020

Aquatic Conservation

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1. Concern for conservation of seagrass habitat has prompted international transplantation-style restoration efforts. A recent review of these restoration efforts has highlighted the low success associated with small-scale restorations, yet scaling up transplantation effort may be too costly for underfunded regions. Small-scale transplant survival can be enhanced with alleviation of two underlying issues: restoration site selection and donor site selection. 2. To investigate appropriate donor source selection, donor site environmental influence on seagrass (Halodule wrightii) transplant survival was examined by transplanting donor cores from two environmentally disparate sites to a transplantation site with limited environmental uncertainties. Donor sites were chosen to represent either end of a benthic light gradient (high versus low) to elucidate seagrass resilience to transplantation stress, with respect to donor site conditions. 3. After total loss of the first trial, a second trial was conducted with stabilizing mesh placed over transplants to reduce stingray bioturbation. The second trial resulted in 100% survival of high light transplants after 12 months and moderate survival (30-60%) of low light transplants for the first six months. 4. At 18 months, the second trial ended after sediment burial from a hurricane. One year post-burial, a patch of H. wrightii recovered at the high light transplant site; after six years the patch expanded to approximately 74 m 2 , an area 37-fold larger than originally planted. 5. Results from this transplant experiment provide evidence that donor environment plays a role in transplant resilience. The transplants sourced from high light had 47% greater leaf area per shoot, were more resistant to transplantation stress, and recovered following an extreme event relative to low light transplants. Therefore, selection of donor plants with more resilience features, a transplantation site with limited environmental uncertainties, and adaptive intervention can enhance seagrass resilience at a small planting scale.

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The Effects of Dock Shading on the Seagrass Halodule wrightii in Perdido Bay, Alabama

Cited by 46 publications

References 22 publications

Development of the microbial communities in lake donghu in relation to water quality

Development of the microbial communities in lake donghu in relation to water quality

Impacts of docks on seagrass and effects of management practices to ameliorate these impacts

The influence of seagrass donor source on small‐scale transplant resilience

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