Influence of temperature and light on particle ingestion by the freshwater phytoflagellate Dinobryon

Jones, Roger; Rees, Sian

doi:10.1127/archiv-hydrobiol/132/1994/203

Cited by 37 publications

(3 citation statements)

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“…However, three particular conditions should be taken into account in our analysis: (1) in the study lakes, we observed an even nutrient distribution in the epilimnion, metalimnion and hypolimnion, indicating that differential nutrient availability was not the cause of DCM development as was observed in the lakes studied by Saros et al (2005); (2) the north-Patagonian Andean lakes are much more transparent than those studied by Saros et al (2005) (mean Z1 %PAR = 33 m, ranging from 15 to 50 m) and this situation causes a deeper DCM location; and (3) the nanoflagellates that dominate the DCM are mainly mixotrophic combining both phototrophy and phagotrophy through photosynthesis and particle uptake. This feeding mode may improve access to scarce nutrients (Nygaard and Tobiesen 1993) and, therefore, should provide a strong advantage in oligotrophic environments, as particle uptake would offer the opportunity to access to scarce elements (Jones and Rees 1994). In the transparent oligotrophic Andean lakes, where light is abundant and the nutrient concentration is very low, mixotrophy may be a key attribute in the functioning of lake food webs (Modenutti et al 2004(Modenutti et al , 2008.…”

Section: Discussionmentioning

confidence: 99%

Environmental changes affecting light climate in oligotrophic mountain lakes: the deep chlorophyll maxima as a sensitive variable

et al. 2012

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The North-Patagonian Andean lakes of Argentina are high light, low nutrient environments that exhibit development of deep chlorophyll maxima (DCM) at the metalimnetic layer during summer stratification, at approximately 1 % of surface PAR irradiance. We examined whether the position of DCM changes as a consequence of long-time (global warming: glacial clay input) and short-time (eruption: volcanic ashes) events. We performed different field studies: (1) an interlacustrine analysis of six lakes from different basins, including data of the 2011 volcanic eruption, which caused an unexpected variation in water transparency; and (2) an intralacustrine analysis in which we compared different stations along a transparency gradient in Lake Mascardi caused by glacial clay input at one end of the gradient. In these analyses, we documented changes in DCM depth and its relationship with different parameters. DCM development was not related with thermocline depth or nutrient distribution. In all cases, the only significant variables were Kd 320 nm and Kd PAR. Our study showed that suspended particles (glacial clay and volcanic ashes) can play a crucial role in transparent lakes, affecting lake features such as the phototrophic biomass distribution along the water column. Suspended solid inputs from either glacial clay or volcanic ashes produce a comparable effect, provoking a decrease in light and, consequently, an upper location of the DCM. Thus, the DCM position is highly sensitive to global changes, such as increased temperatures causing glacier recession or to regional changes caused by volcanic eruptions.

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Section: Discussionmentioning

confidence: 99%

Environmental changes affecting light climate in oligotrophic mountain lakes: the deep chlorophyll maxima as a sensitive variable

et al. 2012

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“…The chemical parameters are mean volume weighted means for the three years (The MOLAR Water Chemistry Group 1999, this issue). Dinobryon sertularia and also some species of Chromulina and Gymnodinium are known from the literature to be potentially mixotrophic, showing facultative bacterial feeding (Porter 1988;Jones & Rees 1994;Isaksson 1998). The prevalence of mixotrophic algae in oligotrophic environments is a well known phenomenon, being mixotrophy an optimal strategy when nutrients are low (Isaksson 1998).…”

Section: Species Compositionmentioning

confidence: 99%

“…The composition of phytoplankton in the sample of March indicate an increase of two species, Chromulina sp. and Dinobryon sertularia, that are facultative mixotrophic (Jones & Rees 1994;Porter 1988;Isaksson 1988). We can only speculate about the occurrence of heterotrophy in this period since we do not have information on the bacterial uptake by those flagellates in LPS under the ice.…”

Section: Total Density and Biomassmentioning

confidence: 99%

Biomass and species structure of the phytoplankton of an high mountain lake (Lake Paione Superiore, Central Alps, Italy)

Pugnetti¹,

Bettinetti²

1999

J Limnol

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In the framework of the EU MOLAR Project on “Measuring and modelling the dynamic response of remote mountain lake ecosystems to environmental change” a three whole-year study (1996-1998) on the composition and dynamics of phytoplankton community of the high mountain lake, acid sensitive Lago Paione Superiore (LPS) was carried out. The data were analyzed and compared with those gathered during the years 1991-1993. The phytoplankton was made up by nanoplanktonic unicellular algae, the only exception being the colonial Dinobryon sertularia. Just four species, belonging to Chrysophyceae (Chromulina sp., Dinobryon sertularia and Mallomonas alveolata) and to Dinophyceae (Gymnodinium sp.) were important as biomass and density, and they were always present throughout the year. The prevalence of potentially mixotrophic species suggests an adaptive strategy to the low environmental concentrations of inorganic carbon and phosphorus. The seasonal variations of the total biomass were similar to those observed in the previous years. The total number of species has increased; this could be related with the recent increase of the pH and of the alkalinity

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Light-induced Mass Turnover in a Mono-species Community of Mixotrophs

Kooijman

Dijkstra

Kooi

2002

Journal of Theoretical Biology

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Influence of temperature and light on particle ingestion by the freshwater phytoflagellate Dinobryon

Cited by 37 publications

References 0 publications

Environmental changes affecting light climate in oligotrophic mountain lakes: the deep chlorophyll maxima as a sensitive variable

Environmental changes affecting light climate in oligotrophic mountain lakes: the deep chlorophyll maxima as a sensitive variable

Biomass and species structure of the phytoplankton of an high mountain lake (Lake Paione Superiore, Central Alps, Italy)

Light-induced Mass Turnover in a Mono-species Community of Mixotrophs

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