Diel vertical migrations of phyto- and zooplankton in a small steeply stratified humic lake with low nutrient concentration

Salonen, Kalevi; Arvola, L.; Rosenberg, Mirja

doi:10.1080/03680770.1992.11900185

Cited by 9 publications

(5 citation statements)

References 18 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…With decreasing light availability, the dominance of species with greater light‐use efficiency may increase, and the photosynthetic pigment content of phytoplankton cells may change facilitating a more efficient use of low light (Desortová, 1981; Diehl et al, 2002; Edwards et al, 2013; Lenard et al, 2018). The mobile flagellated species may perform diurnal migrations, but usually they occupy the epilimnion during the day and stay deeper at night (Pęczuła et al, 2014; Salonen et al, 1993). Thus, their biomass there was not underestimated by samples taken in the daytime.…”

Section: Discussionmentioning

confidence: 99%

Factors behind the threshold‐like changes in lake ecosystems along a water colour gradient: The effects of dissolved organic carbon and iron on euphotic depth, mixing depth and phytoplankton biomass

et al. 2023

View full text Add to dashboard Cite

The effects of water colour, dissolved organic carbon (DOC), iron (Fe) and fetch on the mixing depth (Zmix), euphotic depth (Zeu) and phytoplankton biomass of lakes were studied to clarify the factors behind changes in lake productivity along a DOC gradient. The study was conducted by field sampling 102 lakes in Finland. The lakes were situated mainly in forested areas. At DOC concentrations below 15 mg/L, light attenuation was explained both by Fe and DOC, but at higher DOC concentrations the effect of Fe faded. For the absorption of different wavelengths of photosynthetic light, both DOC and Fe had a significant effect up to 475 nm, but for longer wavelengths only the effect of DOC was significant. Both Zmix and Zeu decreased logarithmically with increasing DOC and water colour. Water colour was determined by DOC and Fe. Zmix increased along with increasing fetch. Zmix exceeded Zeu when DOC concentration was >14.4 mg/L and water colour >106 mg Pt/L (platinum as chloroplatinate ion 3). Above the 14.4 mg/L DOC threshold, the illuminated part of the mixed layer decreased logarithmically with increasing water colour, leaving an increasing part of the mixed epilimnion below the photosynthetic layer. Chlorophyll‐a concentration showed a unimodal relationship with DOC, with the highest biomass occurring at DOC concentrations of 15.7–15.9 mg/L. The results suggested that above DOC concentration 14 mg/L and water colour 106 mg Pt/L, both quality and quantity of light in the epilimnion restrict production by phytoplankton. This can explain the observed threshold‐like changes in lake productivity along a DOC gradient.

show abstract

Section: Discussionmentioning

confidence: 99%

Factors behind the threshold‐like changes in lake ecosystems along a water colour gradient: The effects of dissolved organic carbon and iron on euphotic depth, mixing depth and phytoplankton biomass

et al. 2023

View full text Add to dashboard Cite

show abstract

“…For instance, they may not be able to optimize their position in the water column relative to light [59] and nutrients as they can do in more stable conditions [60], and because of that their growth rate may decrease with further implications for their contribution to phytoplankton biomass. One such species was Gonyostomum semen, a large flagellate alga which has the capacity to exploit the whole water column in shallow humic lakes [60]. It seems that the shift in mixing condition somehow hampered this species.…”

Section: Phytoplankton and Metabolic Processesmentioning

confidence: 99%

“…Another algal genus, Cryptomonas, which is commonly found in small humic lakes and exhibits distinct diurnal migration patterns [60,61], also responded to the mixing. The biomass increase during the experiment was not surprising, because cryptophytes are abundant in a wide range of aquatic environments [50], including small and large humic lakes with shallow and deep thermoclines.…”

Section: Phytoplankton and Metabolic Processesmentioning

confidence: 99%

Food Web Responses to Artificial Mixing in a Small Boreal Lake

Арвола

Rask

Forsius

et al. 2017

Water

View full text Add to dashboard Cite

Abstract:In order to simulate food web responses of small boreal lakes to changes in thermal stratification due to global warming, a 4 year whole-lake manipulation experiment was performed. Within that time, period lake mixing was intensified artificially during two successive summers. Complementary data from a nearby lake of similar size and basic water chemistry were used as a reference. Phytoplankton biomass and chlorophyll a did not respond to the greater mixing depth but an increase was observed in the proportional abundance of diatoms, and the proportional abundance of cryptophytes also increased immediately after the onset of mixing. Obligate anoxic green sulphur bacteria vanished at the onset of mixing but gradually recovered after re-establishment of hypolimnetic anoxic conditions. No major effect on crustacean zooplankton was found, but their diversity increased in the metalimnion. During the mixing, the density of rotifers declined but protozoan density increased in the hypolimnion. Littoral benthic invertebrate density increased during the mixing due to Ephemeroptera, Asellus aquaticus and Chironomidae, whereas the density of Chaoborus larvae declined during mixing and lower densities were still recorded one year after the treatment. No structural changes in fish community were found although gillnet catches increased after the onset of the study. The early growth of perch (Perca fluviatilis) increased compared to the years before the mixing and in comparison to the reference lake, suggesting improved food availability in the experimental lake. Although several food web responses to the greater mixing depth were found, their persistence and ecological significance were strongly dependent on the extent of the disturbance. To better understand the impacts of wind stress on small lakes, long term whole-lake experiments are needed.

show abstract

“…Negative phototaxis caused by UV radiation is enhanced in the presence of zooplanktivorous fish (or their chemical signals -kaironomes), and that is why mainly crustaceoplankton concentrate in deeper layers (Gliwicz, 1986;Ringelberg, 1991). In addition to light, vertebrate predators and food, zooplankton vertical distribution and its seasonal and diurnal changes (diurnal vertical migration -DVM) are also modified by many other factors, such as water temperature and movement (circulation and stratification; Rosado & Lucena, 2001), water transparency, turbidity and colour (e.g., , way of water outflow (Pehlivanov, 2000), reservoir depth (Vilček, 1972), trophic state (Lampert, 1989;Baiao & Boavida, 2000), dissolved oxygen content (e.g., Jiliberto & Zuniga, 2001), invertebrate predators (Salonen et al, 1993;Boeing et al, 2004;Rautio et al, 2003), competition, and others. The organisms must select some trade-off between maximum energy input and faster population growth in the upper layers (with higher temperature and more food) on one hand and maximum protection against visual predators in deeper layers (with lower temperature) on the other hand (Lampert, 1989).…”

Section: Introductionmentioning

confidence: 99%

Vertical distribution of pelagial zooplankton in a middle-sized dimictic valley reservoir

Hudcovicová

Vranovský

2006

Biologia

View full text Add to dashboard Cite

Our observations indicate the vertical distribution of zooplankton and its seasonal changes in Dubník II reservoir (Slovakia) are determined mainly by the thermal regime of the reservoir, by transparency, and by fish and invertebrate predation. During periods of circulation, zooplankton vertical distribution in the whole water column was more homogeneous, whilst during summer temperature stratification zooplankton concentrated in the epilimnion -rotifers in higher layers than crustaceans. During summer stagnation a steep thermal gradient occurred at the boundary of the epi-and hypolimnion and low temperature and low dissolved oxygen in hypolimnion offered a refuge for Chaoborus flavicans larvae against fish, enabling coexistence of vertebrate and invertebrate predation. This evidence supports our previous findings concerning dominance of rotifers in zooplankton and representation of crustaceans by small-bodied species in the study reservoir. Steep thermal gradient and the presence of Chaoborus larvae caused very low zooplankton abundance in the lower part of the water column and a reduction of cladocerans refuges against fish to layers of thermocline or closely under thermocline where Daphnia cucullata and Daphnia parvula were found. Our previous assumptions about the high density of zooplanktivorous fish in Dubník II reservoir are supported by the fact that these small cladocerans are represented by smaller individuals in the upper layers and bigger individuals in deeper layers.

show abstract

Diel vertical migrations of phyto- and zooplankton in a small steeply stratified humic lake with low nutrient concentration

Cited by 9 publications

References 18 publications

Factors behind the threshold‐like changes in lake ecosystems along a water colour gradient: The effects of dissolved organic carbon and iron on euphotic depth, mixing depth and phytoplankton biomass

Factors behind the threshold‐like changes in lake ecosystems along a water colour gradient: The effects of dissolved organic carbon and iron on euphotic depth, mixing depth and phytoplankton biomass

Food Web Responses to Artificial Mixing in a Small Boreal Lake

Vertical distribution of pelagial zooplankton in a middle-sized dimictic valley reservoir

Contact Info

Product

Resources

About