Plankton based energy transfer rates in four Cuban coastal lagoons

Buesa, René J.

doi:10.1016/j.ecss.2017.10.002

Cited by 6 publications

(6 citation statements)

References 13 publications

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“…( 30 ), the product is the maximum (exponential) growth rate which is reached in the limit of large c and large u . For zooplankton, the duplication time is known to be between 60–90 days (Buesa 2019 ); correspondingly, we obtain that day -1 . Estimates of the linear zooplankton mortality rate yield the value on the order of day -1 ; in particular, day -1 in Kumar et al.…”

Section: Appendixmentioning

confidence: 66%

A two-timescale model of plankton–oxygen dynamics predicts formation of oxygen minimum zones and global anoxia

Roy Chowdhury,

Banerjee,

Petrovskii

2024

J. Math. Biol.

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Decline of the dissolved oxygen in the ocean is a growing concern, as it may eventually lead to global anoxia, an elevated mortality of marine fauna and even a mass extinction. Deoxygenation of the ocean often results in the formation of oxygen minimum zones (OMZ): large domains where the abundance of oxygen is much lower than that in the surrounding ocean environment. Factors and processes resulting in the OMZ formation remain controversial. We consider a conceptual model of coupled plankton–oxygen dynamics that, apart from the plankton growth and the oxygen production by phytoplankton, also accounts for the difference in the timescales for phyto- and zooplankton (making it a “slow-fast system”) and for the implicit effect of upper trophic levels resulting in density dependent (nonlinear) zooplankton mortality. The model is investigated using a combination of analytical techniques and numerical simulations. The slow-fast system is decomposed into its slow and fast subsystems. The critical manifold of the slow-fast system and its stability is then studied by analyzing the bifurcation structure of the fast subsystem. We obtain the canard cycles of the slow-fast system for a range of parameter values. However, the system does not allow for persistent relaxation oscillations; instead, the blowup of the canard cycle results in plankton extinction and oxygen depletion. For the spatially explicit model, the earlier works in this direction did not take into account the density dependent mortality rate of the zooplankton, and thus could exhibit Turing pattern. However, the inclusion of the density dependent mortality into the system can lead to stationary Turing patterns. The dynamics of the system is then studied near the Turing bifurcation threshold. We further consider the effect of the self-movement of the zooplankton along with the turbulent mixing. We show that an initial non-uniform perturbation can lead to the formation of an OMZ, which then grows in size and spreads over space. For a sufficiently large timescale separation, the spread of the OMZ can result in global anoxia.

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Section: Appendixmentioning

confidence: 66%

A two-timescale model of plankton–oxygen dynamics predicts formation of oxygen minimum zones and global anoxia

Roy Chowdhury,

Banerjee,

Petrovskii

2024

J. Math. Biol.

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“…Upwelling was more important over the 14-day period, with increased 340 upwelling favourable winds resulting in higher coastally spawned larvae abundances. This is likely 341 due to the time it takes for upwelling to generate increased nutrients at the surface and for this 342 energy to flow into the lower trophic levels (Gasol et al, 1997;Buesa, 2019). The resultant increase 343 in prey (e.g.…”

Section: Discussion 315mentioning

confidence: 99%

“…Over an approximate 14 day cycle, upwelling can generate increased nutrients and chlorophyll at the surface which may in turn flow into the lower trophic levels (Gasol et al , 1997; Buesa, 2019). The resultant increased prey availability for larval fish may increase growth and survival rates (Zenitani et al , 2007).…”

Section: Discussionmentioning

confidence: 99%

“…This is likely caused by offshore transport as strong upwelling drives advection away from the coast and juvenile estuarine and nearshore habitat. It is also recognised that over an approximate 14 day cycle, upwelling can generate increased nutrients and chlorophyll at the surface which may in turn flow into the lower trophic levels (Gasol et al, 1997;Buesa, 2019).…”

Section: A Proposed Recruitment Mechanismmentioning

confidence: 99%

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Coastal winds and larval fish abundance indicate a recruitment mechanism for southeast Australian estuarine fisheries

Schilling

Hinchliffe

Gillson

et al. 2020

Preprint

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Coastal winds transport larval fish towards the coast and estuaries where they ultimately recruit, yet our understanding of the mechanism of how different coastal winds interact to influence estuarine recruitment is incomplete. Here, we first demonstrate a two-stage recruitment mechanism showing that larvae of coastally spawned species increased in abundance with moderately strong upwelling favourable winds 14 days prior to sampling, reflecting increased nutrient and plankton availability for larval fish. The larvae of coastally spawned species increased in abundance with onshore (downwelling favourable) winds three days prior to sampling, which retain larvae near the coast, facilitating estuarine recruitment through onshore transport. Secondly, we show that effects of wind during the spawning period can be detected 2–8 years later (depending on the species) in estuarine commercial fisheries catch rates. Finally, we show in the southeast Australian region, upwelling favourable winds have increased while downwelling favourable winds have decreased since 1850, potentially reducing larval recruitment to estuaries. The two-stage wind mechanism identified in this study is likely applicable to other regions where wind driven upwelling occurs and influences onshore and offshore transport. Future research should incorporate coastal winds into predictions of estuarine catch rates.

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“…Note due to the random slope and intercept effects in the model, the actual y scale is relative from the coast and juvenile estuarine and nearshore habitat. It is also recognised that over an approximate 14-day cycle, upwelling can generate increased nutrients and chlorophyll at the surface which may in turn flow into the lower trophic levels (Buesa, 2019;Gasol et al, 1997). This upwelling may increase prey availability for larval fish, thereby increasing growth and survival rates (Zenitani et al, 2007).…”

Section: A Proposed Recruitment Mechanismmentioning

confidence: 99%

Coastal winds and larval fish abundance indicate a recruitment mechanism for southeast Australian estuarine fisheries

Schilling

Hinchliffe

Gillson

et al. 2021

Fisheries Oceanography

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Coastal winds transport water masses and larval fish onshore or offshore which may influence estuarine recruitment, yet our understanding of the mechanism underlying this relationship is limited. Here, we combine datasets from a historical database of larval fish off southeast Australia with a high-resolution atmospheric reanalysis model to show that normalised abundance of coastally spawned larvae increased with weak to moderate upwelling favourable winds 14 days prior to sampling. The increase in abundance may reflect increased nutrient and plankton availability for larval fish.Normalised larval abundance decreased following strong upwelling favourable winds but increased after onshore (downwelling favourable) winds, due to wind-driven transport. By combining a commercial estuarine fisheries catch-rate dataset (4 species, 8 estuaries, 10 years) and the high-resolution atmospheric reanalysis model, we show that negative effects of upwelling favourable winds during the spawning period can be detected in lagged estuarine commercial fisheries catch rates (lagged by 2-8 years depending on species' growth rates), potentially representing the same mechanism proposed for larval fish. Upwelling favourable winds in the southeast Australian region have increased since 1850 while onshore winds have decreased, which may have reduced larval recruitment to estuaries. Coastal winds are likely an important factor for estuarine recruitment in the southeast Australian region and future research on the estuarine recruitment of fish should incorporate coastal winds.

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Plankton based energy transfer rates in four Cuban coastal lagoons

Cited by 6 publications

References 13 publications

A two-timescale model of plankton–oxygen dynamics predicts formation of oxygen minimum zones and global anoxia

A two-timescale model of plankton–oxygen dynamics predicts formation of oxygen minimum zones and global anoxia

Coastal winds and larval fish abundance indicate a recruitment mechanism for southeast Australian estuarine fisheries

Coastal winds and larval fish abundance indicate a recruitment mechanism for southeast Australian estuarine fisheries

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