D.Sc., University Lecturer Petri Nummi
I have been interested in wetlands for over three decades by now. Beaver and its effects on other wildlife was the starting point of my research, and it has been one my study lines ever since. During recent times, the theme has widened, and now many ecosystem and biodiversity aspects are studied in the beaver engineering framework.
The other main study theme is duck population dynamics. I have been collecting long-term data on duck population, their breeding success and food resources in Evo, southern Finland for 25 years. This has been done in close collaboration with Hannu Pöysä from Finnish Fisheries and Game Research. Together we have also had a long ongoing duck project with Swedish colleagues.
I have also worked with alien species problems. In wetlands these include alien herbivory by the muskrat, and alien predation by the raccoon dog.
- email: petri.nummi(at)helsinki.fi
- phone: +358-9-19158366
- TUHAT database
D.Sc., University Lecturer Veli-Matti Väänänen
My interest in waterfowl originated during my childhood. My childhood home in Maaninka was situated on the shores of a bird-rich lake. It was therefore not surprising that I began monitoring duck populations in my “home lake” and a few other eutrophic lakes nearby (63˚N, 27˚E). Spring 2014 will be my 30th monitoring year. Since 1993 I have also been collecting long-term data on waterfowl populations in the Nuuksio lake area (60oN, 20oE) in collaboration with Petri Nummi.
My main study themes are waterfowl population dynamics and management. My recent topics have been: 1) interactions between invertebrates, fishes and ducks, 2) associations between ducks and small colonial gulls, 3) effect of climatic factors and hunting on duck populations. I have collaborated with Petri Nummi, Hannu Pöysä (Finnish Fisheries and Game Research), and several other researchers in Finland, and with a few colleagues outside Finland as well.
- email: veli-matti.vaananen(at)helsinki.fi
- phone: +358-9-19158367
- TUHAT database
Researchers / post docs
D.Sc Céline Arzel
My research focus is on ecology of Anatidae at their wintering, staging and breeding grounds. Migratory animals are particularly complex to study and their populations likewise challenging to manage because they use various habitats during their annual cycle, thus being subjected to variable environmental constraints. To understand their population dynamics, it is crucial to study the mechanisms leading individuals to migrate and the constraints they face during migration. I thus chose to orient my career in the comprehension of ecosystems and migratory animal population functioning.
- email: celine_arzel(at)yahoo.fr
D.Sc. Sari Holopainen (formerly Suhonen)
In my doctoral thesis I studied duck population dynamics and habitat use in boreal wetlands. I’m also interested in ecosystem engineering by the beaver and duck management. After my dissertation I had about a one year post-doctoral position in urban stormwater projects (Urban Oases and Stormfilter) at the University of Helsinki. My focus was on the nature diversity in stormwater wetlands. In my current post-doctoral research will focus on duck population issues at the flyway scale. I have started my own project “Towards flyway-level adaptive duck management in Europe” in July 2016. The beginning was funded by Haavikko-foundation. Years 2017-2018 are funded by Maj and Tor Nessling Foundation.
- email: sari.holopainen(at)helsinki.fi
- phone: +358-504489538
- TUHAT database
I received my MSc in ecology and evolutionary biology in 2012 from the University of Helsinki. In January 2013 I joined the Wetland Ecology group to start a PhD on the invocation of beavers as ecosystem engineers in ecosystem restoration. The thesis deals with beaver’s effects on boreal ecosystems. The thesis investigates the influences of beaver created flood to diversity of species, water quality and the amount of dead-wood of the drainage basin and also to the diversity of organisms of decayed tree-trunks. The data is collected from Evo.
My doctoral thesis is made at Department of Forest Sciences, University of Helsinki, and is supervised by docent Petri Nummi from Department of Forest Sciences and Professor Lauri Arvola from Lammi biological station.
My main interests are ecology, wildlife, wetlands, frogs, Caliciales, liverworts.
- email: mia.vehkaoja(at)helsinki.fi
- TUHAT database
I became a member of the Wetland Ecology group during the fall of 2013, when I began my PhD on the effects of beaver-induced flooding on beetle (Coleoptera) species. I will be studying beetle species compositions in such areas, focusing on how the desirability of wood for saproxylic and bark beetles changes with increasing moisture content as trees are inundated in beaver-formed ponds. A landscape comparison between beaver-influenced areas and forest structures under various other disturbances (e.g. a managed fire regime) enables the investigation of potential additional features brought about by the wet/moist dying trees. Field work will be carried out during the summer of 2014 and 2015 in the Evo region and the Isojärvi National Park, Finland.
Subject of Master’s thesis:
Lokkikolonioiden vaikutus vesilintujen pesintään Helsingin saaristossa.
Subject of Master’s thesis: Wetland types as duck breeding habitats
/ Erilaiset kosteikot sorsien lisääntymisympäristöinä
Subject of Master’s thesis: Rural wetlands / Kotiseutukosteikko + hankkeen mallikohteiden perustamiseen liittyvät kokemukset
Subject of Master’s thesis: The effect the beaver to the teal: comparison between the landscape scale and the patch scale / Majavan vaikutus taveihin: vertailu maisema- ja laikkutason välillä
Subject of Master’s Thesis: Distribution of the Bean Goose subspecies during autumn migration in Finland / Metsähanhen eri alalajien syysmuutonaikainen esiintyminen Suomessa.
Subject of Master’s thesis: Barnacle geese broods feeding ecology / Valkoposkihanhipoikueiden ruokailuekologia
Subject of Master’s Thesis: The effect of fish to the invertebrate fauna of ponds
Subject of undergraduate degree of BSc Ecology and undergraduate 3rd year dissertation: The ecological affects of Beaver recolonisation on wetland ecosystems.