Feeding of the Dominant Herbivorous Plankton Species in the Black Sea and Their Role in Coccolithophorid Consumption

Amelina, A. B.; Сергеева, В. М.; Арашкевич, Е. Г.; Drits, A. V.; Louppova, N. E.; Solovyev, K. A.

doi:10.1134/s000143701706011x

Cited by 10 publications

(16 citation statements)

References 21 publications

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“…Finally, we found that for both considered zooplankton species their daily food consumption and their maturation times τ i correspond well to estimates from the literature 31–33,48 . This provides extra credits to support our model findings.…”

Section: Resultssupporting

confidence: 83%

“…In the literature, seasonal variation of migration depths is often connected to seasonal change of the width of (i) the oxygen zone in the north-eastern Black Sea and (ii) the zone with suitable water temperature ranges for the species considered 32 . However, the role of the oxygen zone and temperature conditions in DVM are not yet well understood and this model study is intended to shed some light on this long-standing question 31–33 .…”

Section: Resultsmentioning

confidence: 99%

“…We differentiate between strategies of different zooplankton developmental stages and consider how key environmental parameters such as food availability, predation, and habitat size affect the optimal DVM. Using the model, we address the long-standing question of why the migration depth of zooplankton is two-three times greater than the size of the euphotic zone 31–33 . Our modelling research into optimal DVM is backed up by 7 years of empirical observation (2007–2014) of the migration of two abundant copepod species, Calanus euxinus and Pseudocalanus elongates , across seasons and under different biotic and abiotic conditions.…”

Section: Introductionmentioning

confidence: 99%

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Modelling optimal behavioural strategies in structured populations using a novel theoretical framework

Морозов

Kuzenkov

Арашкевич

2019

Sci Rep

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Understanding complex behavioural patterns of organisms observed in nature can be facilitated using mathematical modelling. The conventional paradigm in animal behavior modelling consists of maximisation of some evolutionary fitness function. However, the definition of fitness of an organism or population is generally subjective, and using different criteria can lead us to contradictory model predictions regarding optimal behaviour. Moreover, structuring of natural populations in terms of individual size or developmental stage creates an extra challenge for theoretical modelling. Here we revisit and formalise the definition of evolutionary fitness to describe long-term selection of strategies in deterministic self-replicating systems for generic modelling settings which involve an arbitrary function space of inherited strategies. Then we show how optimal behavioural strategies can be obtained for different developmental stages in a generic von-Foerster stage-structured population model with an arbitrary mortality term. We implement our theoretical framework to explore patterns of optimal diel vertical migration (DVM) of two dominant zooplankton species in the north-eastern Black Sea. We parameterise the model using 7 years of empirical data from 2007-2014 and show that the observed DVM can be explained as the result of a trade-off between depth-dependent metabolic costs for grazers, anoxia zones, available food, and visual predation.

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Section: Resultssupporting

confidence: 83%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Modelling optimal behavioural strategies in structured populations using a novel theoretical framework

Морозов

Kuzenkov

Арашкевич

2019

Sci Rep

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“…The diet of O. davisae consists of small autotrophic and heterotrophic flagellates (Uchima & Hirano, 1988), which enables to avoid the trophic competition with the neritic native copepods that mostly consume the photosynthetic algae (Amelina et al, 2017). Higher locomotor activity, metabolic and production rates facilitate the elimination of the congeneric cyclopoid species from the habitat (Isinibilir et al, 2017).…”

Section: Discussionmentioning

confidence: 99%

Ecophysiological and behavioural responses to salinity and temperature stress in cyclopoid copepod Oithona davisae with comments on gender differences

Svetlichny

Hubareva²,

Uttieri

2020

Medit. Mar. Sci.

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The gender differences in reaction to salinity (3-50) and temperature (6-26°C) stress were studied in the thermophilic cyclopoid copepod Oithona davisae, introduced in the brackish temperate Black Sea since 2001. Both females and males possessed similar salinity tolerance ranges (6–40) irrespective of the salinity change rate, and females displayed a striking osmotic control upon sharp (18-40 and 40-18) salinity shocks. By contrast, the temperature response of males and females were different. Torpidity was recorded at a temperature below 10°C in males collected both in warm and cold seasons, as well as in summer-autumn females whilst in females grown up at the beginning of winter the locomotor parameters were high even at 6°С. The total metabolic rate of summer-autumn and winter females was determined by the level of basal metabolic rate and energy expenditures due to motor activity. In winter females that maintained high activity at low temperature, the total and basal metabolic rates, differing by 2.3 times at all temperatures within the range of 8–28°C, varied in accordance with the temperature coefficient Q10 of about 2, whereas in summer-autumn females at low temperatures total metabolic rate decreased to the basal level. The plasticity of both males and female to wide ranges in abiotic conditions provide an adaptive strategy to sustain the spreading of O. davisae in diverse environments.

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“…Synthesized intracellularly, coccoliths are eventually extruded to the cell surface until a complete coccosphere covering is formed. Normally, E. huxleyi build up a complete single layer (10-15 coccoliths are needed to form a complete coccosphere (Paasche 2002)), but under strained conditions, ene overproduces coccoliths to form a multi-layer cover up to 4 layers thick, made up of over one hundred coccoliths (Balch et al 1993). Eventually, the excessively overlaid cell becomes unstable and begins losing some upper-layer coccoliths into the surrounding water well before the end of the life cycle when the cell becomes totally naked.…”

Section: Cell Morphologymentioning

confidence: 99%

The Phenomenon Of Emiliania Huxleyi In Aspects Of Global Climate And The Ecology Of The World Ocean

Pozdnyakov

Gnatiuk

Davy

et al. 2021

GES

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Emiliania huxleyi (Lohmann) evolved from the genus Gephyrocapsa Kamptner (Prymneosiophyceae) of the coccolithophore family Naёlaerhadaceae. Over the past 100 thousand years E. huxleyi has acquired the status of the most ecologically predominant coccolithophore due to its remarkable adaptability to a variety of environmental conditions and interspecific competitiveness. E. huxleyi plays an important role in both the marine carbon system and carbon cycling between the atmosphere and ocean due to its ability to produce organic and inorganic carbon as well as to form massive blooms throughout the world ocean. This study examines both older information and recent findings to shed light on the current tendencies in the two-way interactions between E. huxleyi blooms and the immediate and global environment under conditions of climate change. The assembled knowledge has emerged from laboratory and mesocosm instrumental investigations, retrievals of satellite remote sensing data, machine learning/statistical analyses, and numerical simulations. Special attention is given to both the quantitative data reported over the last two decades on such interactions, and the only very recently appearing mid-term projections of E. huxleyi bloom dynamics across the world ocean. These blooms strongly affect the atmosphere and ocean carbon cycles. They reduce CO2 fluxes from by ~50% to ~150% as is documented for the North Atlantic, and on the global scale release particulate inorganic carbon as calcium calcite in the amounts assessed at 0.4 to 4.8 PgC/yr. At the same time, they are also sensitive to the atmospheric and oceanic state. This results in E. huxleyi blooms having an increased impact on the environment in response to ongoing global warming.

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Feeding of the Dominant Herbivorous Plankton Species in the Black Sea and Their Role in Coccolithophorid Consumption

Cited by 10 publications

References 21 publications

Modelling optimal behavioural strategies in structured populations using a novel theoretical framework

Modelling optimal behavioural strategies in structured populations using a novel theoretical framework

Ecophysiological and behavioural responses to salinity and temperature stress in cyclopoid copepod Oithona davisae with comments on gender differences

The Phenomenon Of Emiliania Huxleyi In Aspects Of Global Climate And The Ecology Of The World Ocean

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