Search Results - "Marjomäki, Timo J"

An empirical evaluation of the utility of convex hull and standard ellipse areas for assessing population niche widths from stable isotope data by Syväranta, Jari, Lensu, Anssi, Marjomäki, Timo J, Oksanen, Sari, Jones, Roger I

“…Stable isotope analyses are increasingly employed to characterise population niche widths. The convex hull area (TA) in a δ(13)C-δ(15)N biplot has been used as…”
Get full text

Cormorant predation mortality of perch (Perca fluviatilis) in coastal and archipelago areas, northern Baltic Sea by Heikinheimo, Outi, Marjomäki, Timo J, Olin, Mikko, Rusanen, Pekka

“…Abstract Perch (Perca fluviatilis) is an important prey species of the great cormorant (Phalacrocorax carbo sinensis) in the coastal waters of the northern…”
Get full text

Effect of glochidia infection on growth of fish: freshwater pearl mussel Margaritifera margaritifera and brown trout Salmo trutta by Chowdhury, M. Motiur R., Marjomäki, Timo J., Taskinen, Jouni

“…Effect of freshwater mussels’ (Unionoida) glochidia on the growth of fish host has remained poorly studied. We compared the specific growth rate of the…”
Get full text

Influence of warming temperatures on coregonine embryogenesis within and among species by Stewart, Taylor R., Mäkinen, Mikko, Goulon, Chloé, Guillard, Jean, Marjomäki, Timo J., Lasne, Emilien, Karjalainen, Juha, Stockwell, Jason D.

“…The greatest known global response of lakes to climate change has been an increase in water temperatures. The responses of many lake fishes to warming water…”
Get full text

Effect of low dissolved oxygen on the viability of juvenile Margaritifera margaritifera: Hypoxia tolerance ex situ by Hyvärinen, Heini S.H., Sjönberg, Tuomo, Marjomäki, Timo J., Taskinen, Jouni

“…The decline of endangered freshwater pearl mussel (FPM, Margaritifera margaritifera) has been attributed to juvenile mortality caused by low concentrations of…”
Get full text

Indications of polymorphism in the behaviour and morphology of burbot (Lota lota) in a European lake by Marjomäki, Timo J., Mustajärvi, Linda, Mänttäri, Jesse, Kiljunen, Mikko, Karjalainen, Juha

“…In this study, polymorphism in behaviour, morphology, and stable isotope signatures of burbot from Lake Southern Konnevesi, Finland, Europe, was examined…”
Get full text

Dispersion of vendace eggs and larvae around potential nursery areas reveals their reproductive strategy by Karjalainen, Juha, Juntunen, Janne, Keskinen, Tapio, Koljonen, Saija, Nyholm, Kristiina, Ropponen, Janne, Sjövik, Rosanna, Taskinen, Salla, Marjomäki, Timo J.

“…Depending on their reproductive strategy, different fish species aim to aggregate or disperse eggs and larvae in their reproductive habitat. Many pelagic…”
Get full text

An alien fish threatens an endangered parasitic bivalve: the relationship between brook trout (Salvelinus fontinalis) and freshwater pearl mussel (Margaritifera margaritifera) in northern Europe by Salonen, Jouni K., Marjomäki, Timo J., Taskinen, Jouni

“…Host–parasite interactions may play a significant role in biological invasions: for example, an invader may benefit from lower infectivity by native parasites…”
Get full text

The potential ecologically sustainable yield of vendace (Coregonus albula) from large Finnish lakes by Marjomäki, Timo J., Keskinen, Tapio, Karjalainen, Juha

“…Vendace, Coregonus albula (L.), is the main target for commercial fishing in Finnish lakes but is notorious for its strong and unpredictable stock…”
Get full text

Interaction between the endangered freshwater pearl mussel Margaritifera margaritifera, the duck mussel Anodonta anatina and the fish host (Salmo): acquired and cross-immunity by Chowdhury, Md Motiur Rahaman, Salonen, Jouni K., Marjomäki, Timo J., Taskinen, Jouni

“…The common duck mussel Anodonta anatina can live in sympatry with—and use the same host, brown trout ( Salmo trutta )—as the endangered freshwater pearl mussel…”
Get full text

Communal pair spawning behaviour of vendace (Coregonus albula) in the dark by Karjalainen, Juha, Marjomäki, Timo J.

“…Mating in nature is rarely random, and most fish species have refined mating systems. The vendace (Coregonus albula) is a short‐lived, small‐sized,…”
Get full text

Differences in parasite community composition support ecological differentiation in a freshwater gadoid fish by Karvonen, Anssi, Horppila, Petteri, Kuitunen, Jere, Miettinen, Miikka, Ryynänen, Lauri, Marjomäki, Timo J.

“…Several northern freshwater fishes have gone through rapid adaptive radiation after the last glacial period, resulting in new species or intraspecific morphs…”
Get full text

Age is not just a number—Mathematical model suggests senescence affects how fish populations respond to different fishing regimes by Ahti, Pauliina A., Uusi‐Heikkilä, Silva, Marjomäki, Timo J., Kuparinen, Anna

“…Senescence is often described as an age‐dependent increase in natural mortality (known as actuarial senescence) and an age‐dependent decrease in fecundity…”
Get full text

Fish density and target strength distribution of single fish echoes in varying light conditions with single and split beam echosounding and trawling by Jurvelius, Juha, Marjomäki, Timo J., Peltonen, Heikki, Degtev, Andrei, Bergstrand, Eva, Enderlein, Olof, Auvinen, Heikki

“…To evaluate the consistency of mobile and vertical echosounding results from the 1980s to the 2000s, fish density (fish ha −1 ) and target strength (TS, dB)…”
Get full text

Climate change alters the egg development dynamics in cold-water adapted coregonids by Karjalainen, Juha, Keskinen, Tapio, Pulkkanen, Merja, Marjomäki, Timo J.

“…We tested experimentally how the eggs of coregonid fish from the same parents develop at different incubation temperatures under natural long and climate…”
Get full text

Seasonal and ontogenetic variability in stomach size of Eurasian perch (Perca fluviatilis L.) by Pirhonen, Juhani, Muuri, Liisa, Kalliokoski, Saara M., Puranen, Marko M., Marjomäki, Timo J.

“…Eurasian perch ( Perca fluviatilis ) were sampled in April, from May to June and at the end of August to test whether the current season (i.e. feeding…”
Get full text

Phenotypic plasticity in growth and fecundity induced by strong population fluctuations affects reproductive traits of female fish by Karjalainen, Juha, Urpanen, Olli, Keskinen, Tapio, Huuskonen, Hannu, Sarvala, Jouko, Valkeajärvi, Pentti, Marjomäki, Timo J.

“…Fish are known for their high phenotypic plasticity in life‐history traits in relation to environmental variability, and this is particularly pronounced among…”
Get full text

Two-year cyclicity in recruitment of a fish population is driven by an inter-stage effect by Marjomäki, Timo J, Urpanen, Olli, Karjalainen, Juha

“…A 25-year time series for a vendace (Coregonus albula (L.)) population was analysed with mathematical models to reveal the factors that regulate its…”
Get full text

Echo-sounding can discriminate between fish and macroinvertebrates in fresh water by JURVELIUS, JUHA, KNUDSEN, FRANK REIER, BALK, HELGE, MARJOMÄKI, TIMO J, PELTONEN, HEIKKI, TASKINEN, JOUNI, TUOMAALA, ANTTI, VILJANEN, MARKKU

“…1. Acoustic scattering from fish and macroinvertebrates was studied in a boreal Finnish lake at three echosounder frequencies (38, 120 and 200 kHz). Split-beam…”
Get full text

Night, day, sunrise, sunset: do fish under snow and ice recognize the difference by JURVELIUS, JUHA, MARJOMÄKI, TIMO J

“…1. Although boreal lakes are ice-covered for several months annually, little is known about the behaviour of fish under ice. To consider the reasons for diel…”
Get full text