Changes in hard bottom communities related to boat mooring and tributyltin in San Diego Bay a natural experiment

Lenihan, HS; Oliver, JS; Stephenson, MA

doi:10.3354/meps060147

Cited by 29 publications

(14 citation statements)

References 15 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Polychaetes were generally uncommon on plates at the ends of creeks, but at Akuna Bay Ivlarina they were very abundant. This suggests that the marina may somehow enhance the local abundance/settlement of tubiculous polychaetes, a result consistent with the findings of Lenihan et al (1990).…”

Section: Spatial Extent Of the Effects Of Marinassupporting

confidence: 80%

“…Clearly, ~f the marinas are having any effects on the establishment of epibiota, they are not the same at the 2 locations. Few previous studies have compared multiple marinas, but those that have also identified significant differences in the cover and bioinass of certain sessile organisms among marinas (Lenihan et al 1990, Van Dolah et al 1992, Glasby 1997, Turner et al 1997. Patterns in the percentage cover of spirorbid and serpulid polychaetes within Coal & Candle Creek were clearly different from those in the other 2 creeks.…”

Section: Spatial Extent Of the Effects Of Marinasmentioning

confidence: 94%

“…Baird et al 1981, Voudrias & Smith 1986, Lenihan et al 1990, Wendt et al 1990, Van Dolah et al 1992, McGee et al 1995, Turner et al 1997. The specific criteria used for the selection of control locations must be given for any environmental study (e.g.…”

Section: Considerations For Environmental Studies Of Estuarine Epibiotamentioning

confidence: 99%

See 2 more Smart Citations

Determining positions for control locations in environmental studies of estuarine marinas

Glasby¹,

Underwood²

1998

Mar. Ecol. Prog. Ser.

View full text Add to dashboard Cite

Recruitment and development of subtidal epibiota were sampled using settlement plates to identlfy appropriate control locations for tests of environmental impacts of estuarine marinas. Sampling was designed to determine how far any effects of marinas may extend and how the position of a location within an estuary may affect the recruitment and development of epibiota. Mannas may have had minor impacts on epibiotic assemblages, but certainly none that extended further than 1.5 km; hence, locations 1.5 km from mannas could potentially serve as controls. Assenlblages at the inner end of a creek were, however, likely to be very different from those at positions closer to the mouth. Thus, for studies of marinas situated at the ends of creeks, control locations would need to be in corresponding positions in adjacent creeks. W~thout information of this kind, impacts may b e either detected erroneously or masked because inappropriate control locations might be used.

show abstract

Section: Spatial Extent Of the Effects Of Marinassupporting

confidence: 80%

Section: Spatial Extent Of the Effects Of Marinasmentioning

confidence: 94%

See 1 more Smart Citation

Determining positions for control locations in environmental studies of estuarine marinas

Glasby¹,

Underwood²

1998

Mar. Ecol. Prog. Ser.

View full text Add to dashboard Cite

show abstract

“…Numerous studies report that cleared areas surrounding 'swing' moorings are generated by the continuous dragging of the mooring chains Lenihan et al, 1990;Hastings et al, 1995;Creed and Amado Filho, 1999;Francour et al, 1999;Marbà et al, 2002;Crawford, 2003;Milazzo et al, 2004;Montefalcone et al, 2008). At Callala Bay, we estimate that the patch size of the scoured seagrass was 254 m 2 per mooring ( Fig.…”

Section: Discussionmentioning

confidence: 82%

A comparison of the impact of ‘seagrass-friendly’ boat mooring systems on Posidonia australis

Demers

Davis

Knott³

2013

Marine Environmental Research

View full text Add to dashboard Cite

Permanent boat moorings have contributed to the decline of seagrasses worldwide, prompting the development of 'seagrass-friendly' moorings. We contrasted seagrass cover and density (predominantly Posidonia australis) in the vicinity of three mooring types and nearby reference areas lacking moorings in Jervis Bay, Australia. We examined two types of 'seagrass-friendly' mooring and a conventional 'swing' mooring. 'Swing' moorings produced significant seagrass scour, denuding patches of ∼9 m radius. Seagrassfriendly 'cyclone' moorings produced extensive denuded patches (average radius of ∼18 m). Seagrass-friendly 'screw' moorings, conversely, had similar seagrass cover to nearby reference areas. Our findings reinforce previous work highlighting the negative effects of 'swing' and 'cyclone' moorings. In contrast, the previously unstudied 'screw' moorings were highly effective. We conclude that regular maintenance of moorings and the monitoring of surrounding seagrass are required to ensure that 'seagrass-friendly' moorings are operating effectively. This is important, as following damage Posidonia will take many decades to recover. AbstractPermanent boat moorings have contributed to the decline of seagrasses worldwide, prompting the development of 'seagrass-friendly' moorings. We contrasted seagrass cover and density (predominantly Posidonia australis) in the vicinity of three mooring types and nearby reference areas lacking moorings in Jervis Bay, Australia. We examined two types of 'seagrass-friendly' mooring and a conventional 'swing' mooring. 'Swing' moorings produced significant seagrass scour, denuding patches of ~9 m radius. Seagrass-friendly 'cyclone' moorings produced extensive denuded patches (average radius of ~18 m). Seagrass-friendly 'screw' moorings, conversely, had similar seagrass cover to nearby reference areas. Our findings reinforce previous work highlighting the negative effects of 'swing' and 'cyclone' moorings. In contrast, the previously unstudied 'screw' moorings were highly effective. We conclude that regular maintenance of moorings and the monitoring of surrounding seagrass are required to ensure that 'seagrass-friendly' moorings are operating effectively. This is important, as following damage Posidonia will take many decades to recover.

show abstract

“…Damage to submerged vegetation and associated fauna by mooring activities has been frequently reported from marine shores (Walker et al 1989;Lenihan et al 1990;Creed and Amado Filho 1999;Francour et al 1999;Marba et al 2002;Milazzo et al 2004). Seagrass beds are particularly vulnerable.…”

Section: Introductionmentioning

confidence: 99%

Effects of mooring management on submerged vegetation, sediments and macro-invertebrates in Lake Constance, Germany

Ostendorp

Gretler²,

Mainberger³

et al. 2008

Wetlands Ecol Manage

View full text Add to dashboard Cite

Mooring areas are a common form of berthing in many of Germany's inland waters for the growing number of sporting boats. A circular swinging zone around the anchor zone is formed, in which the submerged macrophyte vegetation is destroyed to a large extent, and the sediment surface is eroded. We investigated the effects of two types of buoy (conventional and so-called hook-buoys) in comparison with undisturbed reference sites nearby. The aim of the study was to identify possible harmful consequences of mooring sites to lake littoral habitats in Lake Constance-Untersee, and to provide information to managers to aid them in the formulation of mooring management plans with the least ecological impact. The study focused on submerged vegetation, surface sediments and macro-invertebrate colonisation. In the swinging circle of conventional buoys (87 m 2 ) we observed a significant sediment matter erosion of 0.9 tonnes and a reduction of organic matter amount by 4.5% of the undisturbed reference. The vegetation free area increased by 122%, and the phytomass (mainly Chara div. spp.) was reduced by 14.6% per berth. The psammophilous macro-invertebrate numbers were not significantly affected (-3%) in contrast to the phytophilous taxa which were reduced by 12.7% per berth. The mayfly larvae were the most negatively affected taxon. Oligochaetes profited from the clearing of the sediment surface in the swinging circles. The ecological effects of the hook-buoys were more minor, mainly due to the smaller swinging circle (6 m 2 ). We concluded that the detrimental effects of mooring can be significantly reduced by mooring systems, e. g. the hookbuoy system as it was used in this study, which reduce the area disturbed and cleared by the anchor chain. We argue that these results can be generalised to mooring areas with soft bottom and dense macrophyte vegetation in Lake Constance and other large lakes.

show abstract

Changes in hard bottom communities related to boat mooring and tributyltin in San Diego Bay a natural experiment

Cited by 29 publications

References 15 publications

Determining positions for control locations in environmental studies of estuarine marinas

Determining positions for control locations in environmental studies of estuarine marinas

A comparison of the impact of ‘seagrass-friendly’ boat mooring systems on Posidonia australis

Effects of mooring management on submerged vegetation, sediments and macro-invertebrates in Lake Constance, Germany

Contact Info

Product

Resources

About