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  • 1.
    Carlström, Julia
    et al.
    Naturhistoriska riksmuseet, Enheten för populationsanalys och -övervakning.
    Eriksson, Pia
    Naturhistoriska riksmuseet, Enheten för populationsanalys och -övervakning.
    Owen, Kylie
    Naturhistoriska riksmuseet, Enheten för populationsanalys och -övervakning.
    Sköld, Martin
    Naturhistoriska riksmuseet, Enheten för ringmärkning och palynologi.
    Optimisation of static passive acoustic monitoring of harbour porpoises in the Kattegat Sea2024Rapport (Övrigt vetenskapligt)
    Abstract [en]

    Long-term monitoring of species is necessary for estimating trends in abundance and distribution, andassessing impacts of human activities and conservation actions. As the monitoring needs often exceedavailable resources, optimisation of monitoring effort is important. As part of the Swedish nationalmonitoring programme of harbour porpoises, echolocation activity has been measured at 14 stationslocated in five Natura 2000 sites in the Kattegat Sea over four years (2019–2023). We aimed to evaluatewhether monitoring effort could be reduced while still providing the power to detect a 30% decline overthree generations (equivalent to an annual decline of 1.6%) with 80% power and 20% significance, i.e.similar to OSPAR’s threshold for abundance of cetacean assessment units. Stations were divided intofour groups (3–5 stations/group) based on their spatial distribution and the level and variation in the ratioof the weekly buzz-positive minutes (BPM) to detection-positive minutes (DPM). The BPM metrics wereassumed to indicate differences in habitat use. For each station, daily DPM was modelled as a functionof the Julian day and year to create annual indices. For each group, the trend of the annual indices andassociated power was calculated using a log-linear model over the four years. Finally, the power todetect a trend over time using 1–3 stations per group was estimated, assuming three levels of variance.The variance levels chosen were similar to the lowest, mean and highest variance observed for the 14stations over the four monitoring years. For all four groups of stations, a significant trend was estimatedto be detected within 12 years. The power analysis showed that decreasing the number of stations withina group from 3 to 2 delays the time to reach 80% power by approximately 1 year, while decreasing it from2 to 1 delays it by approximately 2 years. Alternating stations within a group has negligible impact on thepower. Depending on the assumed level of variance, a significant trend could be detected using 2 stationsper group within 6 (σ=0.05), 12 (σ=0.15), or 18 years (σ=0.30). The results indicate that monitoring effortcan be moved to other areas, while still providing sufficient power to allow declines in detections to bedetected within 12 years. Further, they demonstrate that clear objectives and evaluation of the effortneeded are crucial for optimisation among areas, populations or species when resources are limited.

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  • 2. Tummon, Fiona
    et al.
    Adams-Groom, Beverley
    Antunes, Célia M.
    Bruffaerts, Nicolas
    Buters, Jeroen
    Cariñanos, Paloma
    Celenk, Sevcan
    Choël, Marie
    Clot, Bernard
    Cristofori, Antonella
    Crouzy, Benoît
    Damialis, Athanasios
    Fernández, Alberto Rodríguez
    González, Délia Fernández
    Galán, Carmen
    Gedda, Björn
    Naturhistoriska riksmuseet, Enheten för ringmärkning och palynologi.
    Gehrig, Regula
    Gonzalez-Alonso, Monica
    Gottardini, Elena
    Gros-Daillon, Jules
    Hajkova, Lenka
    O’Connor, David
    Östensson, Pia
    Oteros, Jose
    Pauling, Andreas
    Pérez-Badia, Rosa
    Rodinkova, Victoria
    Rodríguez-Rajo, F. Javier
    Ribeiro, Helena
    Sauliene, Ingrida
    Sikoparija, Branko
    Skjøth, Carsten Ambelas
    Spanu, Antonio
    Sofiev, Mikhail
    Sozinova, Olga
    Srnec, Lidija
    Visez, Nicolas
    de Weger, Letty A.
    The role of automatic pollen and fungal spore monitoring across major end-user domains2024Ingår i: Aerobiologia, ISSN 0393-5965, E-ISSN 1573-3025, Vol. 40, nr 1, s. 57-75Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    The advent of automatic pollen and fungal spore monitoring over the past few years has brought about a paradigm change. The provision of real-time  information at high temporal resolution opens the door to a wide range of improvements in terms of the products and services made available to a widening range of end-users and stakeholders. As technology and methods mature, it is essential to properly quantify the impact automatic monitoring has on the different end-user domains to better understand the real long-term benefits to society. In this paper, we focus the main domains where such impacts are expected, using Europe as a basis to provide qualitative estimates and to describe research needs to better quantify impacts in future. This will, in part, also serve to justify further investment and help to expand monitoring networks.

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