A5043427540- Fish Ecology and Management Studies
- Aquatic Invertebrate Ecology and Behavior
- Fish Biology and Ecology Studies
- Marine and fisheries research
- Freshwater macroinvertebrate diversity and ecology
- Research in Social Sciences
- Aquatic Ecosystems and Phytoplankton Dynamics
- Ecology and biodiversity studies
- Forest Ecology and Biodiversity Studies
- Diatoms and Algae Research
- Fish biology, ecology, and behavior
- Aquaculture Nutrition and Growth
- Soil and Water Nutrient Dynamics
- Species Distribution and Climate Change
- Peatlands and Wetlands Ecology
- Isotope Analysis in Ecology
- Historical and Archaeological Studies
- Environmental DNA in Biodiversity Studies
- Marine Bivalve and Aquaculture Studies
- Hydrology and Sediment Transport Processes
- Wildlife-Road Interactions and Conservation
- Water Quality and Pollution Assessment
- Heavy metals in environment
- Genetic diversity and population structure
- Delphi Technique in Research
Natural Resources Institute Finland
2015-2025
University of Oulu
1997-2019
Finnish Environment Institute
2004-2012
Abstract Motivation We compiled a global database of long‐term riverine fish surveys from 46 regional and national monitoring programmes individual academic research efforts, with which numerous basic applied questions in ecology change can be explored. Such spatially temporally extensive datasets have been lacking for freshwater systems comparison to terrestrial ones. Main types variables contained The includes 11,386 time‐series community catch data, including 646,270 species‐specific...
To quantify relative digestion rates of zooplankton prey, we removed alimentary tracts vendace Coregonus albula and whitefish lavaretus larvae, cut them into four equal quarters, analyzed separately. Hard-bodied taxa (e.g., Bosmina sp. Daphnia sp.) were distributed fairly evenly across these whereas soft-bodied Synchaeta Polyarthra concentrated in the first quarter. Thus, zooplanktonic prey digest at different rates. We then ranked according to their resistance digestion, deriving...
Studies focusing on the effects of spatial processes versus environmental filtering aquatic metacommunities have so far been focused almost entirely relatively isolated systems, such as sets different lakes or streams. In contrast, metacommunity patterns and underlying within a single system received less attention. this study, we aimed to examine how strongly variations in diversity indices are affected by (dispersal) local conditions (species sorting) large lake system. Modern biodiversity...
Abstract A fish‐based assessment method was developed to estimate the ecological status of boreal rivers. Electric fishing data were collected from 902 rapids, together with information on land use, channel modification and water chemistry. Discriminant function analysis used select fish variables that most correctly classified undisturbed reference sites human impacted into exact classes. The relationship between level alteration metrics examined. Five selected for index: number species,...
Abstract The EU W ater F ramework D irective ( WFD ) obligates authorities to assess the ecological status of rivers. sampling fish assemblage must be based on a reliable and cost‐effective monitoring programme, it should optimised measure quality cost‐effectively. efficiency single‐pass versus three‐pass backpack electric fishing was measured status. data included 295 samplings from 137 rivers in inland 5‐year series six small forest streams mid‐eastern inland. Compared with fishing, same...
Abstract Parallel sampling of fish, using electrofishing and NORDIC multimesh gillnets, was performed in the littoral areas eight boreal lakes. Some fish species were caught only by (e.g. bullhead, Cottus gobio (L.); burbot, Lota lota (L.)), while some with gillnets pikeperch, Stizostedion lucioperca smelt, Osmerus eperlanus (L.)). The that both methods perch, Perca fluviatilis (L.) exhibited gear‐specific length distributions. A combination gillnetting (passive gear) (active is suggested to...
Abstract Fish assemblages are known to change from headwaters river outlets. Still, our knowledge of this is often approximate or sporadic. In study, we quantified the average longitudinal a large electrofishing data set boreal streams in Northern Europe. The species richness increased medium-sized rivers but levelled off when reaching rivers. Existence some headwater specialist fish species, e.g. brook trout ( Salvelinus fontinalis ), was interpreted support zonation concept over...
The perch foraging pattern in a Finnish lake (64) N) was crepuscular and they moved into littoral areas at dusk returned to deeper waters by dawn. Predation on vendace larvae guided environmental cues, mainly temperature light periodicity, which affected the density activity of area. availability vulnerability different food categories were both responsible for diet. hypothesis that have generally decisive role regulation larval abundance through predation time high concentration area not...
Abstract The effect of agriculture on fish assemblages was assessed using electric fishing data from 108 sites 27 medium‐sized rivers running through organic soils in central and northern Finland. intensity quantified as the percentage catchment area used for (range 0–31%). High correlations ( r 2 = 0.68–0.86) were found between water quality parameters, especially total phosphorus, suspended solids chemical oxygen demand. Densities bullhead, Cottus gobio L., alpine poecilopus Heckel,...
Time‐intensive sampling was used to study minnow Phoxinus phoxinus density and foraging activity in the littoral area of Lake Lentua at a time high vendace Coregonus albula larval abundance. Minnow during late spring‐early summer period low temperatures found be mainly nocturnal quite consistent with features reported literature, exception feeding on larvae. The absence latter finding from previous studies may due seasonally limited daytime samplings. temporal or spatial scale is decisive...
The migratory life history of anadromous salmonids requires successful migration between nursery, feeding, and spawning habitats. Smolting is the major transformation undergo before to feeding areas. It prepares juvenile fish for downstream their entry seawater. We reviewed effects climate change on smolt ecology from growth juveniles in fresh water early post-smolts sea identify potential salmonid populations during this period history. focus was especially Atlantic salmon. shift suitable...
Wild and stocked 0+ pikeperch, Stizostedion lucioperca (L.), were sampled with a purse seine from Lake Oulujärvi, situated at the northern edge of distribution range species. The fry started immediate feeding on smelt, Osmerus eperlanus (L.) after their introduction into lake in early August about 50 mm length, whereas smaller wild pikeperch continued to feed zooplankton. Individual wet weight was six‐fold compared throughout August. length ingested smelt as average 50%, maximum 66%, length....
The stocking of newly hatched pike Esox lucius labelled with radioactive strontium ( 85 Sr) and later electrofishing the same area was found to be a workable tool in assessing success stockings. Sr‐labelled individuals constituted 96% 0+year catch from late summer stocked littoral areas heavily regulated Lokka Reservoir. density reached 2·1 100 m −2 comparison 0·3 reference areas. In three other lakes proportion ranged 0 42% summer. results suggest that stockings are profitable filling empty...
Abstract In hydropeaking rivers, flow regulation typically follows demands in electricity consumption. One hundred and twenty one adult salmon were tagged with radio transmitters to study their spawning run migration patterns conditions. The fish released small groups into the rivers Kemijoki Iijoki, Finland. Typically, made subsequent up‐ downstream movements ascending upstream tailrace of power station then descending again lower water velocities. rate these attempts was higher mid‐summer...