Vertical distribution and feeding activity of Epischura baicalensis Sars (Copepoda) nauplii in response to two predators in Lake Baikal in winter

Tereza, E. P.; Naumova, E. Yu.; Белых, О. И.; Logacheva, N. F.; Pomazkova, G. I.; Dzyuba, Ye. V.; Melnik, N. G.

doi:10.1127/1863-9135/2007/0169-0211

Cited by 6 publications

(4 citation statements)

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“…Second, changes in the daytime depth distribution could be influenced by changes in zooplankton vertical migration behavior. During the daylight hours most zooplankton species in Baikal shift to a deeper position in the water column to avoid visually orienting predators [48] , [49] . If the occurrence or extent of vertical migration changed, then this could result in shallower daytime depth distributions.…”

Section: Discussionmentioning

confidence: 99%

“…We speculate that increasing temperatures could alter the costs and benefits of staying in shallower water, thus leading zooplankton to occupy shallower depths during daylight hours [15] . Patterns of diel vertical migration are strong for several of the most abundant taxa [48] , including Epischura [49] and its primary predators Macrohectopus [53] and the golomyanka [34] . More work examining the trade-offs for Lake Baikal zooplankton might provide insights into the potential for this mechanism to explain the long-term changes in depth distributions.…”

Section: Discussionmentioning

confidence: 99%

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The Rise and Fall of Plankton: Long-Term Changes in the Vertical Distribution of Algae and Grazers in Lake Baikal, Siberia

et al. 2014

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Both surface water temperatures and the intensity of thermal stratification have increased recently in large lakes throughout the world. Such physical changes can be accompanied by shifts in plankton community structure, including changes in relative abundances and depth distributions. Here we analyzed 45 years of data from Lake Baikal, the world's oldest, deepest, and most voluminous lake, to assess long-term trends in the depth distribution of pelagic phytoplankton and zooplankton. Surface water temperatures in Lake Baikal increased steadily between 1955 and 2000, resulting in a stronger thermal gradient within the top 50 m of the water column. In conjunction with these physical changes our analyses reveal significant shifts in the daytime depth distribution of important phytoplankton and zooplankton groups. The relatively heavy diatoms, which often rely on mixing to remain suspended in the photic zone, shifted downward in the water column by 1.90 m y-1, while the depths of other phytoplankton groups did not change significantly. Over the same time span the density-weighted average depth of most major zooplankton groups, including cladocerans, rotifers, and immature copepods, exhibited rapid shifts toward shallower positions (0.57–0.75 m y−1). As a result of these depth changes the vertical overlap between herbivorous copepods (Epischura baikalensis) and their algal food appears to have increased through time while that for cladocerans decreased. We hypothesize that warming surface waters and reduced mixing caused these ecological changes. Future studies should examine how changes in the vertical distribution of plankton might impact energy flow in this lake and others.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

The Rise and Fall of Plankton: Long-Term Changes in the Vertical Distribution of Algae and Grazers in Lake Baikal, Siberia

et al. 2014

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“…Температуру воды, хлорофилл (хл "а"), фотосинтетически активную радиацию (ФАР) и другие параметры измеряли зондом AAQ-Rinko [13]. Кроме того, для измерения температуры воды использовались логгеры (RBR-Company, Канада) TR-1000 (разрешение 0,002°C, точность 0,05°C) и TR-1060 (разрешение 0,0001°C, точность 0,002°C Основными компонентами мезозоопланктона в подледный период являются разные возрастные стадии эндемичного рачка Epischura baikalensis Sars 1900 и несколько видов коловраток [15]. В наблюдаемый период в поверхностном слое 0-10 м численность всего зоопланктона была 459 экз./м 3 (рис.…”

Section: материал и методы исследованияunclassified

Investigation of the ecology of winter plankton of Lake Baikal using complex instrumental methods

Naumova

Rzhepka

Макаров

et al. 2021

Ûg Ross.: èkol. razvit.

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“…The few studies that investigated crustacean feeding under lake ice suggested that copepod nauplii (Tereza et al., 2007), cladocerans (Rautio et al., 2011; Säwström et al., 2009), and some predatory copepods (Karlsson & Sawstrom, 2009) could maintain some foraging activities. However, extensive accumulation of fat storage before or around the onset of ice cover is a trait that is shared by many of the taxa that dominate zooplankton communities under ice (mainly copepods at copepodite and adult instars ; Grosbois et al., 2017; Mariash et al., 2011; Vanderploeg et al., 1998).…”

Section: Introductionmentioning

confidence: 99%

Fasting or feeding: A planktonic food web under lake ice

et al. 2020

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Zooplankton can spend winter actively under the ice cover of lakes. However, dietary resources under lake ice are both quantitatively and qualitatively limited, and feeding might not be energetically rewarding for most zooplankton species. Many zooplankters are expected to fast throughout the winter, exhausting their previously accumulated fat storage. We hypothesised that only a fraction of the actively overwintering zooplankton contributes to an active food web under lake ice, leading to few trophic linkages within the planktonic community. Zooplankton habitats and feeding were investigated under the ice of Lake Onego. Zooplankton habitats and migrations were studied by coupling zooplankton sampling around the clock to measurements of particle movement using an acoustic Doppler current profiler. Secondly, fatty acid‐specific stable isotope compositions were used to determine whether and which zooplankton fatty acids ultimately came from the assimilation of under‐ice seston. The algal biomass was low under ice and mostly dominated by large diatoms. Copepods dominated the zooplankton community. Species present as late copepodite and adult instars were confined to the deeper layers, while nauplii occupied the surface layer. Diel vertical migration by Cyclops was the most tangible observation of persistent feeding under the ice. Previously accumulated fat storage represented most of zooplankton fatty acids, with few, yet detectable, fatty acids recently acquired by feeding under the ice. Although some zooplankton taxa maintained feeding activity under the ice of Lake Onego, the food source available beneath the ice was not sufficiently rewarding to leave an isotopic imprint upon the dominant fatty acids of bulk zooplankton. The seston fatty acids that were passed on to zooplankton from feeding under ice were not provided by diatoms, although they made up most of the phytoplankton biovolume. Instead, the zooplankton food web was supported by mixotrophic phytoplankton (i.e. cryptophytes and chrysophytes) that represented <5% of the under‐ice biovolume. Consequently, the planktonic food web under the ice of Lake Onego had few trophic linkages, and thereby low connectance. Environmental conditions under the ice of Lake Onego do not depart significantly from those observed in lakes of similar latitudes. Therefore, low connectance food webs could be relatively common under ice for lakes above 60° latitude. Our methodological approach is applicable to other lakes and could thus disclose the variability of under‐ice food webs. This would provide a much more complete picture of annual dynamics of food webs in lakes that ice over.

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Vertical distribution and feeding activity of Epischura baicalensis Sars (Copepoda) nauplii in response to two predators in Lake Baikal in winter

Cited by 6 publications

References 0 publications

The Rise and Fall of Plankton: Long-Term Changes in the Vertical Distribution of Algae and Grazers in Lake Baikal, Siberia

The Rise and Fall of Plankton: Long-Term Changes in the Vertical Distribution of Algae and Grazers in Lake Baikal, Siberia

Investigation of the ecology of winter plankton of Lake Baikal using complex instrumental methods

Fasting or feeding: A planktonic food web under lake ice

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