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Fish farms represent a growing source of anthropogenic disturbance to benthic communities, and efficient predictors of such impacts are urgently needed. We explored the effects of fish farm benthic organic and nutrient inputs on the population dynamics of a key seagrass species (Posidonia oceanica) in four Mediterranean deep meadows adjacent to sea bream and sea bass farms. We performed two annual plant censuses on permanent plots at increasing distance from farms and measured benthic sedimentation rates around plots. High shoot mortality rates were recorded near the cages, up to 20 times greater than at control sites. Recruitment rates increased in variability but could not compensate mortality, leading to rapid seagrass decline within the first 100 m from cages. Seagrass mortality increased with total sedimentation rates (K=0.55, p<0.0002), and with organic matter (K=0.50, p=0.001), total nitrogen (K=0.46, p=0.002) and total phosphorus (K=0.56, p<3.10(-5)) inputs. P. oceanica decline accelerated above a phosphorus loading threshold of 50mg m(-2)day(-1). Phosphorus benthic sedimentation rate seems a powerful predictor of seagrass mortality from fish farming. Coupling direct measurements of benthic sedimentation rates with dynamics of key benthic species is proposed as an efficient strategy to predict fish farm impacts to benthic communities.
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http://dx.doi.org/10.1016/j.marpolbul.2008.03.022 | DOI Listing |
Mar Pollut Bull
December 2024
Department of Biology, National and Kapodistrian University of Athens, 15784 Athens, Greece.
Plastic pollution in marine environments is of global concern, yet its distribution within seagrasses remains poorly understood. We explore the efficiency of Posidonia oceanica in trapping microplastics (MPs) across various components (leaves, rhizomes, sediment), examine their potential transfer through the food web and assess their dispersal using advanced modelling techniques. Field surveys confirm that P.
View Article and Find Full Text PDFSci Total Environ
December 2024
Mediterranean Institute for Advanced Studies (CSIC-UIB), Esporles 07190, Spain; School of Civil and Environmental Engineering, Cornell University, Ithaca, NY 14853, USA.
Seagrass berms are a natural accumulation of seagrass leaves along the shoreline, which play an important role in coastal protection. Seagrass berms have been shown to reduce wave energy, helping to shield the coast from erosion. However, their protective role is debated in coastal management, where there are contrasting views on whether berms should be left in place or removed to improve beach aesthetics or accessibility.
View Article and Find Full Text PDFFront Plant Sci
November 2024
National Biodiversity Future Centre (NBFC), Palermo, Italy.
Seed-based restoration methods are increasingly recognized as a relevant tool contributing to halt and reverse the loss of seagrass meadows while providing genetic and evolutionary benefit for the conservation of these habitats. protocols aimed at maximizing the survival of plantlets obtained from seeds in cultivation systems are therefore required. Previous trials of seedling culture of , the dominant seagrass of the Mediterranean Sea, recorded up to 40% loss due to mould development.
View Article and Find Full Text PDFSci Total Environ
December 2024
Marine Ecology and Systematics (MarES), Department of Biology, University of the Balearic Islands, Palma de Mallorca, Spain.
Interest has risen in recent years to assess the fate and impacts of organic ultraviolet (UV) filters in aquatic environments, after being recognized as contaminants of emerging concern. Octinoxate, also known as ethylhexyl methoxycinnamate (EHMC), is among the widely used UV filters in sunscreen formulations. Its potential toxicological effects in aquatic biota have led to precautionary actions in some jurisdictions, such as restricting and even banning its presence in commercial sunscreens.
View Article and Find Full Text PDFSensors (Basel)
October 2024
Instituto de Investigación para la Gestión Integrada de Zonas Costeras, Universitat Politècnica de València, Gandía C/Paranimf, 1, 46730 Grao de Gandia, Spain.
The ocean, with its intricate processes, plays a pivotal role in shaping marine life, habitats, and the Earth's climate. This study addresses issues such as beach erosion, the survival of propagules from species like , and nutrient distribution. To tackle these challenges, we propose an innovative sensor that quantifies hydrodynamic velocity by measuring the output voltage derived from detecting changes in light absorption and scattering using LEDs and LDRs.
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