The complex dynamics make the lake water green and brown
The colors of many lakes and ponds change from pleasant blues and clears to muddy browns and greens due to nutrient and carbon outflows and rising temperatures.
Scientists and water managers struggle to predict the conditions that cause color changes and algae outbreaks, but it’s not as easy as it sounds.
The researchers mainly envision that the ecosystem relationships that lead to these changes are linear and will be added. Rin For example, going to a lake promotes the growth of algae directly and proportionately.
However, new global lake studies have shown that these relationships are much more complex, interdependent, and non-linear.
“Our research shows that without incorporating nonlinear dynamics and considering the two inputs together, we cannot accurately predict how lakes will react to the carbon and added nutrients.” Said Meredith Holgerson, assistant professor of ecosystem and evolutionary biology in the Faculty of Agriculture and Life Sciences. The study’s first author, “Integration of Ecosystem Metabolism and Consumer Ectopicity Reveals Non-Linear Drivers in Lake Organic Processing,” was published in the journal on August 6. Limnology and Oceanography..
Lakes and ponds are becoming increasingly susceptible to eutrophication. Eutrophication means that adding nutrients promotes the growth of plants and algae, makes the lake green, lowers oxygen levels in the water, and can be toxic. Another change the lake faces is “browning”, where increasing organic carbon darkens the lake and increases its degradation. Climate change can exacerbate these conditions, as more frequent and intense storms increase the outflow of nutrients and organic matter from landscapes.
This study examines how phosphorus and carbon inputs to the lake interact and affect. Plant Growth, Respiratory and Ectopic Food Web – How Much of an Organism’s Biomass It comes from terrestrial and aquatic sources.
In this study, a team of eight researchers examined the scientific literature to examine the metabolism of lake ecosystems around the world (total primary production and respiration in lakes) and ectopic food webs (fuel webs). We have compiled a dataset of (amount of land sources to provide). Previous studies have independently investigated metabolism or ectopy, but this is the first study to compare them simultaneously across a large set of lakes. By combining the two indicators, researchers better understand how lakes respond to changes in nutrients and carbon.
“We have found that most of our relationships are non-linear for the two. “Maverick” metabolism.
For example, total primary production (the total rate at which plant material is produced) only increased linearly at intermediate levels of total phosphorus. At high and low levels, the addition of phosphorus did not significantly change the total primary production.
In the past, conventional knowledge said that the greater the external carbon input, the greater the ectopia of the food web. “But instead, we found that the best alloctonies require intermediate levels of carbon and phosphorus,” Holgerson said. “To predict how lakes respond to changes in nutrients and carbon loads, we need to understand the shape of these relationships. “
The dynamics of the lake are not linear, so the study indicates varying thresholds, she said.
“If we do not take into account these threshold changes and the potential interactions between carbon and nutrients, we would be poorly predicting the lake’s response to the changes,” she said.
Ultimately, Holgerson said the eutrophication and browning solutions include nutrient reduction. carbon The load on the lake is theoretically easy, but difficult to implement.
Browning reduces the productivity of lakes and can affect food webs and fish
Meredith A. Holgerson et al, Integration of ecosystem metabolism and consumer ectopy reveals a non-linear driver in the processing of organic matter in lakes, Limnology and Oceanography (2021). DOI: 10.1002 / lno.11907
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