Seasonal variation in invertebrate grazing on Chara connivens and C. tomentosa in Kõiguste Bay, NE Baltic Sea

Kotta, Jonne; Torn, Kaire; Martin, Georg; Orav‐Kotta, Helen; Paalme, Tiina

doi:10.1007/s10152-003-0170-2

Cited by 34 publications

(18 citation statements)

References 42 publications

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“…In contrast, biomass was greater at deeper sites in autumn (September–October). This difference in biomass, however, was probably a consequence of mechanical damage caused by waves and grazing by water birds (Kotta et al 2004; Schmeider et al 2006). The observations over preceding years suggest that Lake Jasne is a standing point for bean geese and swan in the autumn (September to October).…”

Section: Discussionmentioning

confidence: 99%

Depth-dependence and monthly variability of charophyte biomass production: consequences for the precipitation of calcium carbonate in a shallow Chara-lake

Pukacz

Pełechaty

Frankowski

2016

Environ Sci Pollut Res

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The month-to-month variability of biomass and CaCO3 precipitation by dense charophyte beds was studied in a shallow Chara-lake at two depths, 1 and 3 m. Charophyte dry weights (d.w.), the percentage contribution of calcium carbonate to the dry weight and the precipitation of CaCO3 per 1 m2 were analysed from May to October 2011. Physical-chemical parameters of water were also measured for the same sample locations. The mean dry weight and calcium carbonate precipitation were significantly higher at 1 m than at 3 m. The highest measured charophyte dry weight (exceeding 2000 g m−2) was noted at 1 m depth in September, and the highest CaCO3 content in the d.w. (exceeding 80 % of d.w.) was observed at 3 m depth in August. The highest CaCO3 precipitation per 1 m2 exceeded 1695 g at 1 m depth in August. Significant differences in photosynthetically active radiation (PAR) were found between 1 and 3 m depths; there were no significant differences between depths for other water properties. At both sampling depths, there were distinct correlations between the d.w., CaCO3 content and precipitation and water properties. In addition to PAR, the water temperature and magnesium and calcium ion concentrations were among the most significant determinants of CaCO3 content and d.w. The results show that light availability seems to be the major factor in determining charophyte biomass in a typical, undisturbed Chara-lake. The study results are discussed in light of the role of charophyte vegetation in whole ecosystem functioning, with a particular focus on sedimentary processes and the biogeochemical cycle within the littoral zone.

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Section: Discussionmentioning

confidence: 99%

Depth-dependence and monthly variability of charophyte biomass production: consequences for the precipitation of calcium carbonate in a shallow Chara-lake

Pukacz

Pełechaty

Frankowski

2016

Environ Sci Pollut Res

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“…They provide shelter and habitat for numerous species including epiphytic microalgae, filamentous macroalgae, as well as various crustacean and insect species (Lindén et al, 2003;Schmieder et al, 2006;Torn et al, 2010). Besides, charophytes are an important component in the food web as part of the diet of benthic invertebrates (Kotta et al, 2004, waterfowl (Noordhuis et al, 2002;Schmieder et al, 2006), and fish and fish larvae (de Winton et al, 2002;Dugdale et al, 2006).…”

Section: Introductionmentioning

confidence: 99%

In situ production of charophyte communities under reduced light conditions in a brackish-water ecosystem

Kovtun-Kante¹,

Torn²,

Kotta³

2014

Estonian J. Ecol.

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There is a lot of circumstantial evidence that light conditions affect the growth and distribution of charophyte communities. In general, limited light availability causes plants to reduce their growth and ultimately disappear from the area. We experimentally evaluated how reduced water transparency affected the photosynthetic production of a charophyte community dominated by Chara aspera and C. canescens in a brackish-water ecosystem of Haapsalu Bay in June-July 2009. Plastic shades were used to manipulate light conditions in the experimental plots. Two types of nets were used so that plants received either 25% or 50% of the natural irradiance relative to the control community (100%). The results clearly demonstrated that light limitation significantly reduced the net photosynthetic production of charophytes, but a considerable effect was observed within the first 24 h only. What is more significant, the charophyte community recovered its photosynthetic production within two weeks of the experiment in spite of the constant reduction of light down to 25% of the natural irradiance. This suggests that charophytes are able to adapt to a low light environment and recover their photosynthetic performance within a short period even under stressful brackish-water conditions.

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“…Processes such as grazing and anthropogenic disturbance from nutrient addition are known to be important for the algae on tops of boulders (Hillebrand and Kahlert, 2001;Kotta et al, 2004;Kraufvelin et al, 2006;Korpinen and Jormalainen, 2008). In soft sediment habitats of the Baltic Sea, physical disturbance from sand movement is known to be important (Herkül et al, 2006;Torn et al, 2010).…”

mentioning

confidence: 99%

Disturbance-related patterns in unstable rocky benthic habitats of the north-eastern Baltic coast

Liversage¹,

Kotta²

2015

Proc. Estonian Acad. Sci.

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Abstract. Distinct patterns of benthic flora and fauna are produced when unstable rocky substrata are disturbed by water motion. This study investigated occurrence of disturbance-related patterns in benthic boulder habitats on the north-eastern Baltic coast. Sessile assemblages, mostly algae on tops of boulders and barnacles and bryozoans underneath, were found to differ between small (50-150 cm 2 upperside surface area) and large (200-800 cm 2 ) boulders. Densities of motile gammaridean amphipods were negatively correlated with boulder size. These patterns may be due to small boulders being displaced by water motion more frequently than large ones. Most of the barnacle shells/tests were remnant empty ones, and the proportion of empty tests and living barnacles was similar underneath small and large boulders, suggesting that degradation/removal of empty tests was not influenced by disturbance associated with boulder size. There was no consistent evidence of algae being affected by boulder size, but the tops of boulders had less algae than the edges, a pattern that is typically associated with high rates of overturning. Confirmation of disturbance as having caused these patterns and thus being an important process for structuring benthic biota in this region could be achieved by further manipulative experimentation.

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Seasonal variation in invertebrate grazing on Chara connivens and C. tomentosa in Kõiguste Bay, NE Baltic Sea

Cited by 34 publications

References 42 publications

Depth-dependence and monthly variability of charophyte biomass production: consequences for the precipitation of calcium carbonate in a shallow Chara-lake

Depth-dependence and monthly variability of charophyte biomass production: consequences for the precipitation of calcium carbonate in a shallow Chara-lake

In situ production of charophyte communities under reduced light conditions in a brackish-water ecosystem

Disturbance-related patterns in unstable rocky benthic habitats of the north-eastern Baltic coast

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