Human Impacts on Seagrasses: Eutrophication, Sedimentation, and Contamination

Ralph, Peter J.; Tomasko, David A.; Moore, Kenneth A.; Seddon, Stephanie; Macinnis-Ng, Cate

doi:10.1007/1-4020-2983-7_24

Cited by 77 publications

(113 citation statements)

References 127 publications

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“…It could be argued that these stations are not located at the same depth, but natural depth effects on the nitrogen isotope signature have not yet been demonstrated (Lepoint et al, 2003;Grice et al, 1996). Harbor activities and sewage outfall are known to have deleterious effects on the nitrogen isotopic signature of sea grasses (Ralph et al, 2006;Ruiz and Romero, 2003;Pergent-Martini and Pergent, 1996). In Moreton Bay, Australia, a notable increase in the δ 15 N was observed in sea grasses located in the open sea (2.5‰) and in stations close to urban centers (8.7‰) (Costanzo et al, 2001 ).…”

Section: Discussionmentioning

confidence: 99%

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Tracing sewage and natural freshwater input in a Northwest Mediterranean bay: Evidence obtained from isotopic ratios in marine organisms

Lassauque¹,

Lepoint²,

Thibaut³

et al. 2010

Marine Pollution Bulletin

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Elemental carbon and nitrogen levels and isotope ratios were assessed in different biological compartments of a Northwest (NW) Mediterranean bay to trace the various sources of nutrient input from natural (river runoffs) and anthropogenic (harbor outflows, fish farms and urban sewage outfall) sources. Samples from transplanted mussels and natural sea grass communities (Posidonia oceanica leaves and epiphytes) were harvested from different locations throughout the bay during the touristic summer and rainy seasons. The results from the nitrogen analysis revealed that sewage and harbor outflow promote higher nitrogen levels, enrichment of 15 N in the tissues, and a higher seasonal variability in sea grass and epiphytes. In mussel tissues, the δ 15 N was also influenced by sewage and harbor outflow, whereas δ 13 C was influenced by terrestrial inputs. These results suggest that natural and anthropogenic nutrient inputs have a temporary and localized influence and affect the sensitivity of natural isotopic ratios to changes in hydrologic conditions, especially to rain and tourism.

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Section: Discussionmentioning

confidence: 99%

“…Coastal anthropic activities have global deleterious effects on marine ecosystems (Ralph et al, 2006). As often occurs, the sources of said effects can be multiple, and impacts result from the complex interactions between these sources (Peirano and Bianchi, 1995).…”

Section: Introductionmentioning

confidence: 99%

Tracing sewage and natural freshwater input in a Northwest Mediterranean bay: Evidence obtained from isotopic ratios in marine organisms

Lassauque¹,

Lepoint²,

Thibaut³

et al. 2010

Marine Pollution Bulletin

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show abstract

“…The interaction of heavy metals and other stress factors (e.g. high nutrient level and turbidity) on seagrasses have not been studied so far (Ralph et al 2006). According to the suggestion of Conroy et al (1991), heavy metals and nutrients may affect seagrass growth in opposite directions.…”

Section: Discussionmentioning

confidence: 99%

“…Little is known about how seagrasses respond to contamination leading to a poor understanding of tolerance/resistance mechanism (Ralph et al 2006). It is essential to understand whether metal can kill, permanently damage or merely cause stress to the seagrass.…”

Section: Zostera Capricorni Aschers In a Gradient Of Heavy Metals 101mentioning

confidence: 99%

Translational Fluctuating Asymmetry and Leaf Dimension in Seagrass,Zostera capricorniAschers in a Gradient of Heavy Metals

Ambo‐Rappe

Lajus

Schreider

2007

Environmental Bioindicators

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“…Although known to be a reef-building organism capable of long-term sediment retention, P. oceanica meadows are however experiencing a steep decline throughout the Mediterranean Sea [25,26]. Along the Mediterranean coasts, the decline of seagrasses on a large spatial scale has been attributed to anthropogenic disturbances such as illegal trawling [27], fish farming [28], construction of marinas [29], and sewage discharge and pollution [30]. On contrast, on a smaller spatial scale, particularly in coastal areas subjected to intense recreational activity, seagrasses are impacted by mechanical damage caused by boat anchoring or moorings [20,31].…”

Section: Case Study 1: Mapping Of the Upper Limit Of A Posidonia Oceamentioning

confidence: 99%

Unmanned Aerial Systems (UASs) for Environmental Monitoring: A Review with Applications in Coastal Habitats

Ventura¹,

Bonifazi²,

Gravina³

et al. 2017

Aerial Robots - Aerodynamics, Control and Applications

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Nowadays the proliferation of small unmanned aerial systems or vehicles (UAS/ Vs), formerly known as drones, coupled with an increasing interest in tools for environmental monitoring, have led to an exponential use of these unmanned aerial platforms for many applications in the most diverse fields of science. In particular, ecologists require data collected at appropriate spatial and temporal resolutions to describe ecological processes. For these reasons, we are witnessing the proliferation of UAV-based remote sensing techniques because they provide new perspectives on ecological phenomena that would otherwise be difficult to study. Therefore, we propose a brief review regarding the emerging applications of low-cost aerial platforms in the field of environmental sciences such as assessment of vegetation dynamics and forests biodiversity, wildlife research and management, map changes in freshwater marshes, river habitat mapping, and conservation and monitoring programs. In addition, we describe two applications of habitat mapping from UAS-based imagery, along the Central Mediterranean coasts, as study cases: (1) The upper limit of a Posidonia oceanica meadow was mapped to detect impacted areas, (2) high-resolution orthomosaic was used for supporting underwater visual census data in order to visualize juvenile fish densities and microhabitat use in four shallow coastal nurseries.

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Human Impacts on Seagrasses: Eutrophication, Sedimentation, and Contamination

Cited by 77 publications

References 127 publications

Tracing sewage and natural freshwater input in a Northwest Mediterranean bay: Evidence obtained from isotopic ratios in marine organisms

Tracing sewage and natural freshwater input in a Northwest Mediterranean bay: Evidence obtained from isotopic ratios in marine organisms

Translational Fluctuating Asymmetry and Leaf Dimension in Seagrass,Zostera capricorniAschers in a Gradient of Heavy Metals

Unmanned Aerial Systems (UASs) for Environmental Monitoring: A Review with Applications in Coastal Habitats

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