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Pregled bibliografske jedinice broj: 727725

Monitoring of Posidonia meadows under the EC Habitats Directive: vehicular videography can estimate trends in coverage at low cost and high precision


Schultz, Stewart T.; Bakran-Petricioli, Tatjana; Kruschel, Claudia; Petricioli, Donat
Monitoring of Posidonia meadows under the EC Habitats Directive: vehicular videography can estimate trends in coverage at low cost and high precision // Proceedings of the 5th Mediterranean Symposium on Marine Vegetation / Langar H., Bouafif C., Ouerghi A. (ur.).
Tunis: RAC/SPA publications, 2014. str. 161-166 (predavanje, međunarodna recenzija, cjeloviti rad (in extenso), znanstveni)


Naslov
Monitoring of Posidonia meadows under the EC Habitats Directive: vehicular videography can estimate trends in coverage at low cost and high precision

Autori
Schultz, Stewart T. ; Bakran-Petricioli, Tatjana ; Kruschel, Claudia ; Petricioli, Donat

Vrsta, podvrsta i kategorija rada
Radovi u zbornicima skupova, cjeloviti rad (in extenso), znanstveni

Izvornik
Proceedings of the 5th Mediterranean Symposium on Marine Vegetation / Langar H., Bouafif C., Ouerghi A. - Tunis : RAC/SPA publications, 2014, 161-166

Skup
5th Mediterranean Symposium on Marine Vegetation

Mjesto i datum
Portorož, Slovenija, 27. - 28. 10. 2014

Vrsta sudjelovanja
Predavanje

Vrsta recenzije
Međunarodna recenzija

Ključne riječi
Posidonia oceanica; monitoring; Habitats Directive

Sažetak
Regular monitoring of Posidonia oceanica (L.) (Posidoniaceae) is required under EC directives, and its purpose is to inform management agencies when and where actions are necessary to protect and restore ecological health and water quality. The Habitats Directive requires each EU member nation to report specifically on temporal trend in areal extent of Posidonia habitat. The success of the HD hinges on the power of the monitoring protocol to reveal a significant negative trend, wherever that trend occurs in nature. Statistical power is determined by the size of the sampling error of the protocol, which includes measurement uncertainty and natural spatial variation in the descriptor. We review several descriptors of Posidonia status, and consider published estimates of their typical sampling errors, to compare their ability to demonstrate a 10% temporal trend. We find that the protocols with potentially high statistical power are fixed-plot methods such as SeagrassNet and balisage, high resolution aerial photography, and remote underwater videography. The lowest statistical power is found for random plot protocols using descriptors from the interior meadow such as shoot density measured by SCUBA in 40 x 40 cm quadrats. The main advantage of videography over direct SCUBA methods is the ability to sample 20-30 times the area sampled by the equivalent SCUBA labour, but with none of the fatigue or discomfort. The main advantage of videography over aerial photography or acoustic imaging is its high resolution and near-perfect habitat classification accuracy for live seagrass, dead matte, and non-seagrass benthic habitats. We recommend remote underwater videography as a low-cost method of uncovering trends in Posidonia cover with high statistical power.

Izvorni jezik
Engleski

Znanstvena područja
Biologija



POVEZANOST RADA


Projekt / tema
HRZZ-IP-2013-11-3107 - Uvjeti, resursi, neprijatelji i bioraznolikost: Sile koje oblikuju morske zajednice u plitkom Jadranskom moru (Stewart Schultz, )

Ustanove
Prirodoslovno-matematički fakultet, Zagreb,
Sveučilište u Zadru