Biogeochemical interactions control a temporal succession in the elemental composition of marine communities

Martiny, Adam C.; Talarmin, Agathe; Mouginot, Céline; Lee, Jeanette A.; Huang, Jeremy; Gellene, Alyssa G.; Caron, David A.

doi:10.1002/lno.10233

Cited by 35 publications

(58 citation statements)

References 42 publications

(53 reference statements)

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“…Our experimental results regarding the optimal supply N:P are in accordance with the positive correlations observed between temperature and the N:P ratio of marine seston (Martiny et al ; Yvon‐Durocher et al ), and temperature and cellular N:P ratio within species (Yvon‐Durocher et al ). While the trends in seston N:P ratios likely are influenced by both differences in community composition, ambient nutrient concentrations, and direct temperature effects (Martiny et al ; Galbraith and Martiny ; Yvon‐Durocher et al ), our study focused solely on the temperature‐related plasticity response.…”

Section: Discussionsupporting

confidence: 90%

Plasticity in algal stoichiometry: Experimental evidence of a temperature‐induced shift in optimal supply N:P ratio

Thrane

Hessen

Andersen

2017

Limnology & Oceanography

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There is growing empirical and theoretical evidence for a positive relationship between the nitrogen (N)-to-phosphorus (P) ratio of phytoplankton and temperature. However, few have tested how the optimal supply N:P ratio; the dissolved N:P ratio at which nutrient limitation switches from one element to the other, responds to temperature. In this study, we conducted a factorial experiment crossing 12 temperature levels with 8 supply N:P ratios to determine the effect of temperature acclimation on the optimal supply N:P ratio of the microalgae Chlamydomonas reinhardtii. We found that the optimal supply N:P increased in a sigmoidal manner from 26.5 to 36.5 (atomic ratio) over a temperature gradient spanning from 10 to 188C, with the steepest change around 158C. This result is in accordance with trends observed for cellular and seston N:P ratios, and indicates that phytoplankton populations may be shifted toward N-limitation in a scenario of warmer waters.

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Section: Discussionsupporting

confidence: 90%

Plasticity in algal stoichiometry: Experimental evidence of a temperature‐induced shift in optimal supply N:P ratio

Thrane

Hessen

Andersen

2017

Limnology & Oceanography

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“…In both models, the residual variance is high for all factors but temperature, which suggests that short‐term signals and measurement errors are the main sources of this variance. Measuring errors may be minor for some factors ( T , P , and POM concentrations) but can be large for POM ratios [ Martiny et al ., ]. The high contribution of residual variance across all factors further suggests that short‐term changes are a big source of variance.…”

Section: Resultsmentioning

confidence: 99%

“…Our study reveals that large fractions of the total temporal variability of POM concentrations and ratios are associated with time scales shorter than the season. Part of this may be due to measurement errors, but the finding is consistent with multiple recent studies of marine physical, chemical, and biological factors showing extensive short‐term variability of carbon and nutrient uptake [ Marrec et al ., ; Martz et al ., ] as well as particulate matter accumulation and elemental ratios [ Martiny et al ., ]. This includes strong diel changes in the physiology and elemental composition of phytoplankton [ Hunter‐Cevera et al ., ; Lopez et al ., ].…”

Section: Discussionmentioning

confidence: 97%

“…A third mechanism that needs to be evaluated in future studies is the role of specific phytoplankton populations. Several studies have demonstrated that coexisting phytoplankton lineages can have unique elemental requirements [ Arrigo et al ., ; Quigg et al ., ; Martiny et al ., ; Alexander et al ., ], which in turn may influence the elemental ratio of particulate organic matter and nutrient drawdown [ Weber and Deutsch , ; Martiny et al ., ]. Thus, our study demonstrates that we still do not fully understand the drivers of elemental ratios in marine communities and that there is a clear need to further understand how variation in phytoplankton composition and physiology affect these key ratios.…”

Section: Discussionmentioning

confidence: 99%

“…A few studies have examined seasonal and/or long-term changes in marine POM elemental ratios [Karl et al, 2001;Frigstad et al, 2011;Frigstad et al, 2013;Singh et al, 2015;Martiny et al, 2016]. It was demonstrated that C:P and N:P but not C:N display seasonal oscillations [Frigstad et al, 2011;Singh et al, 2015;Martiny et al, 2016]. In addition, several sites displayed long-term variability that might be linked to lower frequency climate cycles [Karl et al, 2001;Frigstad et al, 2013;Martiny et al, 2016].…”

Section: Introductionmentioning

confidence: 99%

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Seasonal and long‐term changes in elemental concentrations and ratios of marine particulate organic matter

Talarmin

Lomas

Bozec

et al. 2016

Global Biogeochemical Cycles

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What is the temporal variability of the elemental stoichiometry of marine microbial communities across ocean regions? To answer this question, we present an analysis of environmental conditions, particulate organic carbon, nitrogen, and phosphorus concentrations and their ratios across 20 time series (3–25 years duration) representing estuarine, coastal, and open ocean environments. The majority of stations showed significant seasonal oscillations in particulate organic elemental concentrations and ratios. However, shorter‐term changes contributed most to overall variance in particulate organic matter concentrations and ratios. We found a correlation between the seasonal oscillations of environmental conditions and elemental ratios at many coastal but not open ocean and estuarine stations. C:N peaked near the seasonal temperature minimum and nutrient maximum, but some stations showed other seasonal links. C:N ratios declined with time over the respective observation periods at all open ocean and estuarine stations as well as at five coastal station but increased at the nine other coastal stations. C:P (but not N:P) declined slightly at Bermuda Atlantic Time‐series Study but showed large significant increases at Hawaii Ocean Time‐series and Arendal stations. The relationships between long‐term changes in environmental conditions and particulate organic matter concentrations or ratios were ambiguous, but interactions between changes in temperature and nutrient availability were important. Overall, our analysis demonstrates significant changes in elemental ratios at long‐term and seasonal time scales across regions, but the underlying mechanisms are currently unclear. Thus, we need to better understand the detailed mechanisms driving the elemental composition of marine microbial ecosystems in order to predict how oceans will respond to environmental changes.

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Unraveling the multiple facilitative effects of consumers on marine primary producers

Bracken,

Bernatchez,

Badten

et al. 2024

Ecology

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The loss of consumers threatens the integrity of ecological systems, but the mechanisms underlying the effects on communities and ecosystems remain difficult to predict. This is, in part, due to the complex roles that consumers play in those systems. Here, we highlight this complexity by quantifying two mechanisms by which molluscan grazers—typically thought of as consumers of their algal resources—facilitate algae on rocky shores. Initial observations in high‐zone tide pools revealed that both water‐column ammonium concentrations and photosynthetic biomass were higher in pools containing higher densities of grazers, suggesting that local‐scale nutrient recycling by the grazers could be enhancing algal biomass. We assessed this possibility by experimentally manipulating grazer abundances at the level of whole tide pools but controlling access of those grazers to experimental plots within each pool. Contrary to predictions that algal biomass inside grazer exclusions would increase as grazer abundances in the pools increased, we found that algal biomass inside grazer‐exclusion fences was unaffected by grazer abundances. Instead, the consumptive effects of grazers that were evident at low grazer abundances transitioned to facilitative effects as experimentally manipulated grazer abundances increased. This finding suggested that these positive interactions were associated with the physical presence of grazers and not just grazers' effects on nutrient availability. Subsequent experiments highlighted the potential role of “slime”—the pedal mucous trails left behind as the mollusks crawl on the substratum—in promoting the recruitment of algae and thereby mediating a spatial subsidy of new organic matter into the system. Furthermore, different grazer groups contributed disproportionately to ammonium excretion (i.e., turban snails) versus slime production (i.e., littorine snails), suggesting a potential role for grazer diversity. Our work highlights the complex ways in which consumers affect their resources, including multiple, complementary mechanisms by which these grazers facilitate the algae they consume.

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Biogeochemical interactions control a temporal succession in the elemental composition of marine communities

Abstract: CitationBiogeochemical interactions control a temporal succession in the elemental composition of marine communities 2016, 61 (2):531 Limnology and Oceanography

Cited by 35 publications

References 42 publications

Plasticity in algal stoichiometry: Experimental evidence of a temperature‐induced shift in optimal supply N:P ratio

Plasticity in algal stoichiometry: Experimental evidence of a temperature‐induced shift in optimal supply N:P ratio

Seasonal and long‐term changes in elemental concentrations and ratios of marine particulate organic matter

Unraveling the multiple facilitative effects of consumers on marine primary producers

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