Year-round measures of planktonic metabolism reveal net autotrophy in surface waters of a Great Lakes estuary

Defore, Angela L.; Weinke, Anthony D.; Lindback, Morgan; Biddanda, Bopaiah A.

doi:10.3354/ame01790

Cited by 9 publications

(3 citation statements)

References 69 publications

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“…The number of hypoxic days and the severity of hypoxia varied greatly throughout the decade as differing winter and spring precipitation likely led to differing nutrient and organic matter inputs to Muskegon Lake, which may ultimately drive hypoxia. Indeed, several earlier studies have revealed that Muskegon Lake is a net sink for both inorganic nutrients and organic matter received from the Muskegon River, which helps explain how riverine, nutrientfueled excess phytoplankton production and organic matter-fueled respiration within the lake may contribute to variable bottom water hypoxia [6,7,28,37,50,51]. Therefore, eutrophication was a major issue during dry and severely hypoxic years as the residence time within Muskegon Lake lengthened.…”

Section: Variable Inter-and Intra-annual Hypoxiamentioning

confidence: 99%

Recurringly Hypoxic: Bottom Water Oxygen Depletion Is Linked to Temperature and Precipitation in a Great Lakes Estuary

Dugener,

Weinke,

Stone

et al. 2023

Hydrobiology

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Hypolimnetic hypoxia is expanding globally due to anthropogenic eutrophication and climate warming. Muskegon Lake, a Great Lakes estuary, experiences annually recurring hypoxia, impairing ecological, social, and economic benefits. Using high-frequency, time-series Muskegon Lake Observatory (MLO) data, we quantified the dynamics of hypoxia and developed a hypoxia severity index to estimate the spatiotemporal extent of hypoxia during 2011–2021. We also analyzed United States Geological Survey’s temperature and discharge data on the Muskegon River to explain the annual variability in the hypoxia severity index. Severe hypoxia occurred in warmer years with greater stratification, fewer wind mixing events, warmer winter river temperatures, and less winter and spring precipitation, as in 2012 and 2021. Conversely, milder hypoxia was prevalent in colder years with a later stratification onset, more mixing events, colder river temperatures, and more winter and spring precipitation, as in 2015 and 2019. Thus, knowledge of environmental conditions prior to the onset of stratification may be useful for predicting the potential severity of hypoxia for any year. While consistent multi-year trends in hypoxia were not discernible, our findings suggest that temperature and precipitation are major drivers of hypoxia and that as surface waters warm, it will lead to the further deoxygenation of Earth’s inland waters.

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Section: Variable Inter-and Intra-annual Hypoxiamentioning

confidence: 99%

Recurringly Hypoxic: Bottom Water Oxygen Depletion Is Linked to Temperature and Precipitation in a Great Lakes Estuary

Dugener,

Weinke,

Stone

et al. 2023

Hydrobiology

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“…P:R ratios < 1 have frequently been interpreted as evidence of consumer reliance on allochthonous organic carbon (Thorp and Delong 2002). Central to the foundational understanding of the relationship between net heterotrophy (R > P) and terrestrial support of aquatic food webs are the ideas that in persistently net autotrophic ecosystems (where P:R > 1), food webs are based on phytoplankton OC (e.g., Defore et al 2016), while in persistently heterotrophic ecosystems (where P:R < 1) terrestrial OC is actively incorporated into the food web (e.g., Urabe et al 2005). We review evidence that mid‐lake P:R ratios, despite their appealing simplicity, offer limited insights into metazoan reliance on allochthonous OC owing to (1) the strong effect of microbial production efficiency on R; (2) the strong reliance of metazoan production on autochthonous production irrespective of the rate and amount of allochthonous OC supplied; and (3) the differential effects of external OC supplied in dissolved forms in the water column relative to particulate forms to the benthos.…”

Section: Introductionmentioning

confidence: 99%

Shoring up the foundations of production to respiration ratios in lakes

Vadeboncoeur

2021

Limnology & Oceanography

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The ratio of primary production to ecosystem respiration rates (P:R ratio) is an ostensibly simple calculation that is used to characterize lake function, including trophic status, the incorporation of terrestrial organic carbon into lacustrian food webs, and the direction of carbon dioxide (CO 2 ) flux between a lake and the atmosphere. However, many predictive links between P:R ratios and lake ecosystem function stem from a historically plankton-centric perspective and the common use of the diel oxygen curve approach. We review the evolution of the use of P:R ratios and examine common assumptions underlying their application to (1) eutrophication, (2) carbon flux through lake food webs, and (3) the role of lakes in the global carbon budget. Foundational P:R studies have been complicated principally by the following: most P:R ratios were calculated from mid-lake measurements and failed to incorporate nonplanktonic dynamics; there has been confusion regarding the food web implications when P:R ≠ 1; and CO 2 fluxes between lakes and the atmosphere are influenced by nonmetabolic processes. We argue for a re-assessment, or shoring up, of several fundamental assumptions that continue to guide metabolism research in lakes by accounting for mixing, benthic-littoral processes, groundwater fluxes, and abiotic controls on gas dynamics to better understand lake food webs and accurately integrate lake ecosystems into landscape-scale carbon cycling models.

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“…At the daily scale, light and temperature are a primary control on GPP (Langman et al 2010;Richardson et al 2017), yet on the weekly scale storms events can be an important driver of GPP (Jennings et al 2012). Seasonal changes to metabolism are largely driven by temperature and light (Hansen et al 2006;Langman et al 2010;Yvon-Durocher et al 2010;Defore et al 2016). In a detailed study of metabolism of a Danish lake, daily GPP values were strongly related to temperature, but GPP was seasonally dependent on temperature coupled with irradiance and primary producer biomass (Staehr and Sand-Jensen 2007).…”

Section: Discussionmentioning

confidence: 99%

Effects of Invasive Watermilfoil and Seasonal Dynamics on Primary Production in Littoral Zones of North-Temperate Lakes

Goethem¹,

R²

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Year-round measures of planktonic metabolism reveal net autotrophy in surface waters of a Great Lakes estuary

Cited by 9 publications

References 69 publications

Recurringly Hypoxic: Bottom Water Oxygen Depletion Is Linked to Temperature and Precipitation in a Great Lakes Estuary

Recurringly Hypoxic: Bottom Water Oxygen Depletion Is Linked to Temperature and Precipitation in a Great Lakes Estuary

Shoring up the foundations of production to respiration ratios in lakes

Effects of Invasive Watermilfoil and Seasonal Dynamics on Primary Production in Littoral Zones of North-Temperate Lakes

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