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| 2. |
- Björklund, Erland, et al.
(författare)
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MORPHEUS success story Segesholmsån river and Degeberga WWTP, Skåne, Sweden
- 2021
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Rapport (övrigt vetenskapligt/konstnärligt)abstract
- In the MORPHEUS project three Swedish Wastewater Treatment Plants (WWTPs) were investigated for their release of pharmaceuticals into the recipient. One of these was Degeberga WWTP which discharges its treated wastewater into the Segesholmsån river, ending in the Baltic Sea. Segesholmsån river has a length of 23 km and an average flow of roughly 0.6 m3/s (Figure 1).
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| 3. |
- Gunnarsson, Gunnar, 1976-
(författare)
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Survival patterns and density-dependent processes in breeding mallards Anas platyrhynchos
- 2007
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Doktorsavhandling (övrigt vetenskapligt/konstnärligt)abstract
- Measuring and assessing vital rates such as births and deaths are prerequisites for understanding population dynamics. Vital rates may be affected by the density of individuals, even though the importance of density dependence on population dynamics has been debated for a long time. The mallard Anas platyrhynchos is one of the foremost game species in the Holarctic, with millions of birds in hunters’ bags annually. Still, basic knowledge about regulation of mallards’ vital rates is poor, and experimental studies on this topic are rare.In this thesis I have studied survival patterns and density dependence in mallards breeding in Sweden and Finland. Long-term ringing data from both countries were analysed for mortality patterns and causation, as well as for e.g. survival rate estimation. Most of the studies were, though, experiments run over two years involving manipulations of the density of nests, broods and/or adults, in southern and northern Sweden, comprising different biotic regions. Common response variables were survival of nests, ducklings and hens, mainly analysed with program MARK.About 90% of the recovered mallards in Finland and Sweden were hunting kills. However, survival rates were high, ranging from 0.66 to 0.81 for most groups (sex*age). The generality of density dependence was evident since such processes were detected in all studies. Consequently, depredation rate was higher in high nest density compared to low nest density. Survival of ducklings was density-dependent in both boreal and nemoral biotic regions, with food limitation being evident in the former region but not in the latter. In spite of their generality, density-dependent patterns varied within as well between years, and for nest predation rates also between landscape types.The findings about density dependence in breeding mallards in this thesis are novel since they are based on experiments. They are potentially of general interest for management because they embrace a variety of lakes in two geographically distant areas, each being representative for large temperate areas in the northern hemisphere. Detection of density dependence at the local scale may be important at larger scales, too, following the principle of ‘ideal preemptive distribution’ in a source-sink dynamic system.
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| 4. |
- Djerf, Henric, et al.
(författare)
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Inventeringsfiske i Arkelstorpsviken : 13-17 Augusti 2019
- 2019
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Rapport (övrigt vetenskapligt/konstnärligt)abstract
- Arkelstorpsviken är en grund och kraftigt övergödd vik. Som efter sjö sänkningen är avskild från Oppmannasjön med en kanal på 1 km. Vid den norra stranden ligger samhället Arkelstorp. Under åren 2018-2020 driver Oppmanna Vånga byggderåd ett LEADER projekt tillsammans med Högskolan Kristianstad. Projektet syftar till att ta reda på varför sjön är kraftigt övergödd och vad som är lämpliga åtgärder för att bättra vatten kvaliteten. Arkelstorpsviken är intressant då miljöövervakningen indikerar att stora mängder näringsämne lämnar vikennedströms. Dessa näringsämnen hamnar först i Ivösjön men sedan i Hanöbukten. Denna undersökning är gjord som del i LEADER projektet för att få en inblick hur den ekologiska statusen är i Arkelstorpsviken.
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| 5. |
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| 6. |
- Gunnarsson, Gunnar
(författare)
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Strandängarna i Kristianstads Vattenrike – hotade “hot spots”
- 2015
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Ingår i: Forskningsmiljön Man & Biosphere Health. - Kristianstad : Kristianstads kommun. ; , s. 7-11
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Bokkapitel (övrigt vetenskapligt/konstnärligt)abstract
- På relativt kort tid har flera arter strandängsvadare minskat dramatiskt i Kristianstads Vattenrike. Pågående forskning bedrivs för att utröna om nedgångarna kan ha orsakats av faktorer längre ner i näringsväven. I speciellt fokus för forskningen är produktionen av vegetation och ryggradslösa djur.
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| 8. |
- Holopainen, Sari, et al.
(författare)
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Sustainable management of migratory European ducks : finding model species
- 2018
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Konferensbidrag (övrigt vetenskapligt/konstnärligt)abstract
- Eurasian migratory ducks are a natural resource shared between multiple European countries. Due to lack of flyway-level management and monitoring, there is a risk of “the tragedy of the commons” arising, where populations are overexploited. Effective management may also be hindered by a poor understanding of the factors that limit and regulate migratory populations throughout their flyways, and over time. Following decades of population increase, some European duck populations now show signs of levelling off or even decline, underlining the need for more active management. In Europe, we lack effective common tools to manage duck populations, despite the need and enthusiasm for establishing flyway-level adaptive management (AM) schemes for migratory birds. There are several international legal agreements (e.g. EEC Birds Directive, AEWA) that oblige European countries to sustainably manage migratory birds and their habitats. Although the lack of coordinated demographic and hunting data remains a challenge to sustainable management planning for waterfowl, AM provides a robust decision-making framework even in the presence of uncertainty.We investigate the research and monitoring needs in Europe to successfully apply AM to ducks, and search for possible model species, focusing on freshwater duck species. Our geographical focus is NW Europe (excluding Russia), the area utilized by ducks in the East-Atlantic flyway. Based on current knowledge and their wide distribution, we suggest that Common Teal Anas crecca, Eurasian Wigeon Mareca penelopeand Common Goldeneye Bucephala clangulawould be the best species for testing the application of an AM modelling approach for ducks in Europe. Applying AM to huntable species with relatively good population data as models for broader implementation represents a cost effective way of starting to develop AM on a European flyway scale for ducks and other harvested waterbirds.
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