Improving estimates of primary production in lakes: a test and a case study from a peri-alpine lake (Lake Lugano)

Franchini, Filippo; Lepori, Fabio; Bruder, Andreas

doi:10.1080/20442041.2017.1294351

Cited by 8 publications

(5 citation statements)

References 31 publications

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“…Gross primary production in Lake Geneva was estimated from the CIPEL measurements ( 14 C assimilation method) using the software SoftLake (Cannata et al., 2020; Franchini et al., 2017; C. Minaudo, pers. comm.)…”

Section: Methodsmentioning

confidence: 99%

Net Ecosystem Production of Lakes Estimated From Hypolimnetic Organic Carbon Sinks

Steinsberger

Wüest

Müller

2021

Water Resources Research

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Primary production in the photic surface layer is at the onset of life and the trophic cascade in natural waters. The assimilation of carbon (C), phosphorus (P), nitrogen (N) and other nutrients as well as the release of oxygen (O 2 ) in the productive surface zone is reversed in the hypolimnion as organic particles settle through the water column to the sediment surface (Wetzel, 2001). If this cycling is excessive, the wellknown adverse effects of deep-water anoxia, accumulation of large amounts of deposited organic carbon (OC) and the release of reduced substances (methane, ammonium) from the sediment is observed. The flux of OC leaving the productive surface layer and settling across the density (temperature) gradient into the hypolimnion is termed net ecosystem production (NEP, in units of gC m −2 yr −1 ). In the productive zone, primary production and respiration occur simultaneously with diurnally changing intensities. Primary production takes place during daylight, whereas respiration is active during the entire day. Both processes are

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Section: Methodsmentioning

confidence: 99%

Net Ecosystem Production of Lakes Estimated From Hypolimnetic Organic Carbon Sinks

Steinsberger

Wüest

Müller

2021

Water Resources Research

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“…Winters are mild (January average daily temperature = 3.3°C), summers are hot and humid (July average daily temperature = 22.1°C), and yearly precipitation is high (annual average = 1559 mm). Because of the mild winters, the lake remains ice-free throughout the winter (40).…”

Section: Study Areamentioning

confidence: 99%

How much hatchery-reared brown trout move in a large, deep subalpine lake? An acoustic telemetry study

Brignone,

Minazzi,

Molina

et al. 2024

Preprint

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Fish movement into large, deep lakes has been rarely investigated due to the complexity and extent of such ecosystems. Among the different monitoring methods available, acoustic telemetry enables to study spatial ecology of aquatic organisms and to investigate their behavior in lentic environments. In this study, movement of 69 hatchery-reared adult brown trout (size 43–61 cm) marked with acoustic transmitters was monitored in the large and deep subalpine Lake Lugano (Switzerland and Italy). Trout were tracked for six consecutive months by 7 hydrophones (April-August 2022), positioned in a non-overlapping array. Trout movement was reconstructed using R packages specific for acoustic telemetry (Actel and RSP), which also allowed to translate tracking information into utilization distribution (UD) areas for each fish. The effects of different environmental variables (rainfall, water discharge of the two main tributaries of Lake Lugano, atmospheric pressure, cloud coverage and moon phases) on trout movement was tested, but none of these variables seemed to correlate with fish movement. Although trout marked with acoustic transmitters were hatchery-reared fish, the extent of their total movement throughout the study period was unexpected, with many trout moving for more than 100 km in few months. The extent of such movement patterns is potentially related to an explorative behavior, which is more pronounced in hatchery-reared fish due to their more aggressive and bolder attitude. The association of these behavioral traits, shaped by domestication, could expose hatchery-reared fish to higher risks and post-release mortality in the wild.

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“…However, while nutrient concentrations have decreased by more than an order of magnitude, primary production has decreased only slightly, varying significantly from year to year due to meteorological conditions. Franchini et al (2017) proposed an improvement to existing mathematical interpolation models that calculate cumulative (i.e. seasonal or annual) primary production rates from instantaneous (i.e.…”

Section: D Ecological-only Modelsmentioning

confidence: 99%

Modelling physical and ecological processes in medium-to-large deep European perialpine lakes: a review

2021

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In this paper we review a significant sample of the modelling studies carried out on medium-to-large deep European perialpine lakes (MLDEPLs). The reviewed bibliographic corpus was obtained querying Elsevier’s Scopus® database with a tailored search string on 8 January 2021. Results were filtered, accepting only journal papers written in English dealing with natural lakes having surface area > 10 km2. A list of 75 works was obtained, published between 1986 and 2021. Most studies have been carried out on Swiss lakes (44 out of 75 papers), Lake Geneva being the most investigated environment. A significant positive correlation was found between lake surface area and volume and the number of dedicated papers, suggesting that scientific attention is higher for environments characterised by large dimensions and relevant socio-economic interests. Both the number of papers and their citation count have experienced an exponential growth in time, pointing to a rising interest in quantitative modelling applications, but also to the increasing availability and ease of use of numerical modelling tools. Among the 75 selected papers, 55 employ a hydrodynamic driver, used alone or coupled with an ecological module, while the remnant 20 works adopt an ecological-only model. Among the papers employing hydrodynamic models, the use of three-dimensional (3D) drivers is surprisingly slightly more frequent (28 papers) than that of one-dimensional (1D) ones (26 papers), with most 3D applications having been published in the last 2011-2020 decade (24 papers). This reflects the interest on the hydrodynamic processes leading to the observed spatial heterogeneities in the biochemical properties of the MLDEPLs. However, coupling of ecological modules with 3D hydrodynamic drivers, to directly simulate these phenomena, is still restricted (2 papers) compared to that of 1D hydrodynamic drivers (8 papers), due to calibration and computational difficulties, which could be strongly reduced by future research achievements. Nevertheless, 1D models allow performing long-term prognoses considering multiple climate change and watershed management scenarios, due to their much smaller computational burden. The largest group of works dealing with ecological-only models (6 papers) is dedicated to applications of phosphorus budget models, which can above all be used to forecast variations in lake productivity in response to changes in the availability of the limiting nutrient. Graphical abstract

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Improving estimates of primary production in lakes: a test and a case study from a peri-alpine lake (Lake Lugano)

Cited by 8 publications

References 31 publications

Net Ecosystem Production of Lakes Estimated From Hypolimnetic Organic Carbon Sinks

Net Ecosystem Production of Lakes Estimated From Hypolimnetic Organic Carbon Sinks

How much hatchery-reared brown trout move in a large, deep subalpine lake? An acoustic telemetry study

Modelling physical and ecological processes in medium-to-large deep European perialpine lakes: a review

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