Deposition, burial and sequestration of carbon in an oligotrophic, tropical lake

Alcocer, Javier; Ruiz-Fernández, Ana Carolina; Escobar, Elva; Pérez-Bernal, Libia Hascibe; Oseguera, Luis A.; Ardiles-Gloria, Vilma

doi:10.4081/jlimnol.2014.783

Cited by 17 publications

(8 citation statements)

References 61 publications

(65 reference statements)

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“…Quantitative samples of superficial sediment (top 3 cm) were collected from the deepest part of Atexcac, La Preciosa and Quechulac with an Eckman dredge (area = 0.0625 m 2 ), and a sample of mixed sediments obtained from several places at the shore of El Carmen. Sampling of the eggs contained in the superficial sediment layer allowed us to obtain a representative sample of genotypes produced during several years (at least 20 y at each lake if calculated on the sedimentation rate of 0.16 cm yr -1 measured in the neighboring Lake Alchichica [ 65 ]). Sediments were transported to the laboratory in total darkness at 4° C [ 66 ].…”

Section: Methodsmentioning

confidence: 99%

From Local Adaptation to Ecological Speciation in Copepod Populations from Neighboring Lakes

et al. 2015

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Continental copepods have been derived from several independent invasive events from the sea, but the subsequent evolutionary processes that account for the current diversity in lacustrine environments are virtually unknown. Salinity is highly variable among lakes and constitutes a source of divergent selection driving potential reproductive isolation. We studied four populations of the calanoid copepod Leptodiaptomus cf. sicilis inhabiting four neighboring lakes with a common history (since the Late Pleistocene) located in the Oriental Basin, Mexico; one lake is shallow and varies in salinity periodically (1.4–10 g L-1), while three are deep and permanent, with constant salinity (0.5, 1.1 and 6.5 g L-1, respectively). We hypothesized that (1) these populations belong to a different species than L. sicilis sensu stricto and (2) are experiencing ecologically based divergence due to salinity differences. We assessed morphological and molecular (mtDNA) COI variation, as well as fitness differences and tests of reproductive isolation. Although relationships of the Mexican populations with L. sicilis s.s. could not be elucidated, we identified a clear pattern of divergent selection driven by salinity conditions. The four populations can still be considered a single biological species (sexual recognition and hybridization are still possible in laboratory conditions), but they have diverged into at least three different phenotypes: two locally adapted, specialized in the lakes of constant salinity (saline vs. freshwater), and an intermediate generalist phenotype inhabiting the temporary lake with fluctuating salinity. The specialized phenotypes are poorly suited as migrants, so prezygotic isolation due to immigrant inviability is highly probable. This implication was supported by molecular evidence that showed restricted gene flow, persistence of founder events, and a pattern of allopatric fragmentation. This study showed how ecologically based divergent selection may explain diversification patterns in lacustrine copepods.

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Section: Methodsmentioning

confidence: 99%

From Local Adaptation to Ecological Speciation in Copepod Populations from Neighboring Lakes

et al. 2015

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“…The OC burial rates values ranged from 11 g C m −2 yr −1 to 1123 g C m −2 yr −1 , with a true population mean from 154 to 378 (95% C.I.). These rates are several fold greater and significantly higher (Tukey‐Kramer; p < 0.05) than those reported for lakes in other climatic regions, including arctic (Sobek et al ), boreal (Ferland et al ), temperate (Dietz et al ) and tropical (Alcocer et al ) lakes (6 g C m −2 yr −1 , 2 g C m −2 yr −1 , 33 g C m −2 yr −1 , and 24 g C m −2 yr −1 , respectively) ( see Fig. for details), and in subtropical floodplain lakes (15 g C m −2 yr −1 ) (Dong et al ).…”

Section: Resultsmentioning

confidence: 66%

“… Organic carbon burial rates from lakes of the floodplain of three main river water types, i.e., whitewater 78 ± 14 ( n = 3), blackwater 203 ± 57 ( n = 13 cores), and clearwater 498 ± 124 ( n = 6) using original and previously published data (dark grey bars) compared to other freshwater lake types; arctic n = 7: 5.9 ± 1.3 SE (Sobek et al ), boreal n = 12: 19.6 ± 4.8 SE (Ferland et al ), temperate n = 116: 33 ± 2.1 SE (Dietz et al ), and tropical n = 2: 23.5 ± 5.5 SE (Sobek et al ; Alcocer et al ) (white bars). Different capital letters indicate significant difference ( p < 0.05) in carbon burial between lake types.…”

Section: Resultsmentioning

confidence: 99%

Carbon accumulation in Amazonian floodplain lakes: A significant component of Amazon budgets?

Sanders

Taffs

Stokes

et al. 2017

Limnol Oceanogr Letters

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The Amazon floodplains cover approximately 10% of the Amazon Basin and are composed of predominantly anoxic sediments that may store large amounts of carbon. Our study combines 210 Pb derived sedimentation rates from four recently analyzed sediment cores (n 5 4) with previously published organic carbon (OC) burial estimates (n 5 18) to provide a broad, first order estimate of carbon accumulation in Amazon floodplain lakes. The OC burial rates were 266 6 57 g C m 22 yr 21. This rate is several folds greater than those reported for lakes in arctic, boreal, temperate, and tropical regions. The large amount and spatial variation of OC burial rates in these floodplain lakes highlights the need for increased sampling efforts to better measure these potentially important components of the Amazon Basin carbon budget. This is an open access article under the terms of the Creative Commons Attribution NonCommercial License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited and is not used for commercial purposes. Scientific Significance StatementIn the Amazon Basin, floodplains and the lakes within them are major sources of greenhouse gases. However, it is not known whether carbon burial in the floodplain lakes is large enough to offset their greenhouse gas emissions. Here, we show that Amazonian floodplain lakes can partly offset greenhouse gas emissions through significant carbon burial rates (266 6 57 g C m 22 yr 21) that are greater than any other measured lake type. By extrapolating our observations, we show that burial in Amazon floodplain lakes may play an important role in the carbon budget of the Amazon Basin.

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“…Nevertheless, increases in OC sedimentation outpaced the degradation process, suggesting that productivity is the process that enables shallow subtropical lakes to permanently sequester OC in the sediments. The average OC burial rate calculated for the pre-1950 period in our study lakes (61 g OC m -2 a -1 , Table 3) is still greater than the Arctic, boreal, temperate, subtropical, and tropical systems mentioned above [39–42].…”

Section: Discussionmentioning

confidence: 75%

“…This rate is lower than tropical systems of the Amazon Basin (266 g C m -2 a -1 ) [7] and temperate agricultural impoundments (>1000 g C m -2 a -1 ) [6]. Nevertheless, the numbers from Florida’s subtropical lakes are higher than values measured in many Arctic (6 g C m -2 a -1 ) [39], boreal (2 g C m -2 a -1 ) [40], temperate (33 g C m -2 a -1 ) [41], and tropical (24 g C m -2 a -1 ) [42] systems. Our subtropical lakes yielded OC burial values similar to those from temperate lakes in agricultural landscapes (64–200 g C m -2 a -1 ) [5].…”

Section: Discussionmentioning

confidence: 99%

Organic carbon sequestration in sediments of subtropical Florida lakes

et al. 2019

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Recent studies have shown that sediments of temperate and tropical lakes are sinks for organic carbon (OC), but little is known about OC burial in subtropical lakes. There are questions regarding the ability of subtropical lakes to store OC, given their relatively warmwater temperatures, lack of ice cover, frequent water-column mixing, and labile carbon forms. We used 210Pb-dated sediment cores from 11 shallow Florida (USA) lakes to estimate OC burial, i.e. net OC storage, over the last ~100 years. Shallow Florida water bodies average ~30% OC content in their sediments and displayed rates of net OC accumulation (63–177 g C m-2 a-1) that are similar to natural temperate lakes, but lower than temperate agricultural impoundments. We considered the influence of lake morphometry on OC storage in our study lakes, but did not observe an inverse relationship between lake size and OC burial rate, as has been seen in some temperate lake districts. We did, however, find an inverse relation between mean water depth and OC sequestration. Despite recent cultural eutrophication and the associated shift from macrophyte to phytoplankton dominance in the Florida study lakes, overall OC burial rate increased relative to historic (pre-1950 AD) values. Lakes cover >9000 km2 of the Florida landscape, suggesting that OC burial in sediments amounts to as much as 1.6 Mt a-1. The high rate of OC burial in Florida lake sediments indicates that subtropical lakes are important for carbon sequestration and should be included in models of global carbon cycling.

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Deposition, burial and sequestration of carbon in an oligotrophic, tropical lake

Abstract: The amount of biogenic carbon that may be deposited, buried and eventually preserved (sequestered)

Cited by 17 publications

References 61 publications

From Local Adaptation to Ecological Speciation in Copepod Populations from Neighboring Lakes

From Local Adaptation to Ecological Speciation in Copepod Populations from Neighboring Lakes

Carbon accumulation in Amazonian floodplain lakes: A significant component of Amazon budgets?

Organic carbon sequestration in sediments of subtropical Florida lakes

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