Nutrient cycling in tropical and temperate coastal waters: Is latitude making a difference?

Lønborg, Christian; Müller, Moritz; Butler, Edward C. V.; Jiang, Shan; Ooi, Seng Keat; Trinh, Dieu Huong; Wong, Pui Yee; Ali, Suryati M.; Chun, Cui; Wee, Boon Siong; Yando, Erik S.; Friess, Daniel A.; Rosentreter, Judith A.; Eyre, Bradley D.; Martin, Patrick

doi:10.1016/j.ecss.2021.107571

Cited by 33 publications

(14 citation statements)

References 250 publications

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“…The amount of chemical fertilizer applied in tropical countries is one of the largest globally, such as 415 kg hectare -1 yr -1 in Vietnam, 569 kg hectare -1 yr -1 in Egypt and 2106 kg hectare -1 yr -1 in Malaysia (https://data.worldbank.org/indicator/ AG.CON.FERT.ZS). Together with high precipitation rates, the unconsumed fertilizer may directly drain from estuaries and subterranean estuaries into tropical coasts (Lønborg et al, 2021), which highlights the urgency and necessity of a better dimensioning of fertilizer application and replacement from chemical fertilizer to organic fertilizer and slow-release fertilizer thus reducing application quantities (Liang et al, 2022). Moreover, the potentiation of nitrogen-fixing legume species, e.g., Soybean, Groundnut and Cowpea (Peoples and Herridge, 1990), in the tropical agriculture, could favor a balanced N application on land.…”

Section: Economic Evaluation and Developmentmentioning

confidence: 99%

Exploring feedback mechanisms for nitrogen and organic carbon cycling in tropical coastal zones

Jiang

Jin

et al. 2022

Front. Mar. Sci.

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The anthropogenic introduction of significant amounts of reactive nitrogen in the coastal zone particularly since the discovery and application of the Haber-Bosch process has profound consequences over organic carbon storage and transformations at both regional and global scales. Here, we review our current knowledge on cause-effect chains for nitrogen, especially dissolved inorganic nitrogen, on organic carbon cycling in coastal tropical systems. We focus on the feedback mechanisms for turnover of different organic carbon species to nitrogen excess and links to current environmental and climate changes. We pay special attention to organic carbon dynamics in tropical coasts due to their high primary productivity, rapid sedimentation, and significant needs of nitrogen for agriculture and industry usages. Together with land-use changes and economy development, we highlight the vulnerability of carbon storage in tropical coasts triggered by nitrogen overloading and outline possible industrial strategies with low carbon cycling disturbance to benefit the development of tropical countries.

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Section: Economic Evaluation and Developmentmentioning

confidence: 99%

Exploring feedback mechanisms for nitrogen and organic carbon cycling in tropical coastal zones

Jiang

Jin

et al. 2022

Front. Mar. Sci.

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“…In polar and temperate coastal waters, given its large variability, temperature emerges as a key control variable (Huete‐Stauffer et al., 2015; Pomeroy & Wiebe, 2001). On the contrary, in tropical coastal waters temperatures are more stable, but it is still uncertain whether temperature is a major controlling factor (Lønborg et al., 2021). Some studies suggest that in these waters microbial processes are already functioning close to their optima; therefore, increasing temperatures further should not have any large impact or a negative influence on biogeochemical process rates (Morán et al., 2017; Wiebe & Pomeroy, 1999).…”

Section: Introductionmentioning

confidence: 99%

Heterotrophic Bacteria Respond Differently to Increasing Temperature and Dissolved Organic Carbon Sources in Two Tropical Coastal Systems

et al. 2022

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Around 10% of the world's coastal water lies within the tropics (Jahnke, 2010). Tropical coastal waters naturally have high temperatures and sunlight levels, and are amongst the most active biogeochemical zones in the ocean (Brunskill, 2010;Jennerjahn, 2012;Lønborg et al., 2021). Despite this importance, comparatively few studies in tropical coastal waters have investigated the role of microbes in biogeochemical cycling and which environmental factors impact their physiology. In polar and temperate coastal waters, given its large variability, temperature emerges as a key control variable (Huete-Stauffer et al., 2015;Pomeroy & Wiebe, 2001). On the contrary, in tropical coastal waters temperatures are more stable, but it is still uncertain whether temperature is a major controlling factor (Lønborg et al., 2021). Some studies suggest that in these waters microbial processes are already functioning close to their optima; therefore, increasing temperatures further should not have any large impact or a negative influence on biogeochemical process rates (Morán et al., 2017;Wiebe & Pomeroy, 1999). However, other studies suggest that tropical marine microbes actually increase their activity under warmer conditions (Lønborg et al., 2019;McKinnon et al., 2017).

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“…The estuary is valued for its intact ecosystems, including extensive mangrove forests, mudflats and reefs, which support an array of wildlife. Worldwide, tropical estuaries are under increasing pressure from anthropogenic impacts with a paucity of research in comparison to temperate counterparts (Gruber and Galloway 2008;Lønborg et al 2021). This scarcity is even more pronounced for macrotidal systems of the tropics.…”

Section: Introductionmentioning

confidence: 99%

“…Darwin Harbour, Australia's 'northern gateway' is also subject to expanding development pressures, and the impact of increasing anthropogenic nutrient loading on ecosystem services is a critical knowledge gap. Impacts are expected to be greater in tropical zones globally (Downing et al 1999;Galloway et al 2008;Lara et al 2001) with regions such as South-East Asia particularly susceptible to anthropogenic nutrient loading, coastal development and climate change pressures (Halpern et al 2008;Jennerjahn et al 2004;Lønborg et al 2021).…”

Section: Introductionmentioning

confidence: 99%

Denitrification in intertidal sediments of a tropical estuary subject to increasing development pressures

et al. 2022

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Darwin Harbour is a working port and the most populated city in the Northern Territory of Australia. This macrotidal estuary is located in the wet–dry tropics of Northern Australia and notwithstanding mounting development pressures in the region, is largely unmodified. The prevailing oligotrophic condition of estuarine waters suggest that biogeochemical cycling in sediments remain active, buffering the influence of anthropogenic inputs. We tested the hypothesis that nutrient hotspots exist in depositional low-velocity zones, with a gradient of high to low nitrogen processing from the upper to outer reaches of the estuary. A number of factors were examined for their influence on the effectiveness of denitrification in these depositional zones, a putative key process driving nitrogen removal, with particular emphasis on carbon-loading extremes in tidal creeks, spatial gradients along the estuary and the influence of seasonality. There were significant differences in process rates between hypereutrophic/eutrophic tidal creeks that receive the largest proportion of treated sewage loads in the region and the mesotrophic/oligotrophic tidal creeks that were comparatively undisturbed. Net benthic nutrient fluxes and dinitrogen efflux rates were more than an order of magnitude higher and lower, respectively, in degraded (hypereutrophic/eutrophic) tidal creek systems where denitrification efficiency (DE%) was < 40%. Denitrification (Dinitrogen efflux) rates in tidal creeks (mesotrophic/oligotrophic) and broader estuarine sites were high (~ 8 mmol N m−2 day−1) and denitrification efficiency remained > 65%, particularly during the wet season. On a whole-of-estuary basis, denitrification in conjunction with mechanisms such as burial could feasibly make a substantial impact, abating the influence of anthropogenic inputs. Although considerable variability was encountered, particularly across seasons, the hypothesis of elevated denitrification rates as nutrient hotspots in depositional zones along the estuary was not convincing. More influential are tidal creeks as potential ‘reactors’ for N cycling and removal, but their capacity can be degraded by overloading with nutrients.

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Nutrient cycling in tropical and temperate coastal waters: Is latitude making a difference?

Cited by 33 publications

References 250 publications

Exploring feedback mechanisms for nitrogen and organic carbon cycling in tropical coastal zones

Exploring feedback mechanisms for nitrogen and organic carbon cycling in tropical coastal zones

Heterotrophic Bacteria Respond Differently to Increasing Temperature and Dissolved Organic Carbon Sources in Two Tropical Coastal Systems

Denitrification in intertidal sediments of a tropical estuary subject to increasing development pressures

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