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Khanaychenko, Antonina; Mukhanov, Vladimir; Aganesova, Larisa O.; Beşiktepe, Şengül; Gavrilova, Nelly

doi:10.4194/1303-2712-v18_8_02

Cited by 10 publications

(3 citation statements)

References 45 publications

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“…In mechanisms of adherence and locomotion, the expulsion of highly hydrated extracellular polymeric substances (EPS) from the raphe system of diatom is implicated [1,13]. This process is closely linked to migratory rhythms, light and dark cycles, and the highest levels of EPS are produced under phosphorus limitation.…”

Section: Resultsmentioning

confidence: 99%

“…Copepod culture. Culture of copepod Oithona davisae Ferrari and Orsi, 1984, originated from the ovigerous females selected from alive zooplankton samples from the Sevastopol Bay in June 2013, and thereafter was fed cultured cryptophytes IBSS Cr-54 isolate [13]. The sub-culture of copepod was separated in late August 2013, and besides cryptophytes, diatom C. closterium was added at initial level 10³ cells•mL -1 , to test this diatom as a possible prey for O. davisae, while control culture of O. davisae was fed only cryptophytes.…”

Section: Methodsmentioning

confidence: 99%

“…C. closterium is often found in plankton and is abundant in offshore areas [21]. Study of feeding selectivity of O. davisae in natural environment of the Black Sea so far did not reveal feeding on diatoms [13]. Currently, the data on feeding of ambush feeder O. davisae on diatoms are contradictory and uncertain [10] while this copepod is often abundant during summer diatom blooms [20].…”

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confidence: 99%

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How diatom Cylindrotheca closterium vanquish invasive copepod Oithona davisae

Khanaychenko

2018

mbj

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Some diatoms are rich food for herbivorous copepods, while others are toxic for their recruitment. No negative effect of diatom Cylindrotheca closterium was ever observed for copepods, and some estuarine copepods preferred it as a food. Data on grazing diatoms by abundant now in the Black Sea coastal waters invasive copepod Oithona davisae are still contradictory. Interaction of O. davisae and C. closterium, both having high colonizing potential and both typical for coastal waters, was studied in experimental culture. Two weeks after inoculation of C. closterium the cultured O. davisae was drastically fouled by globulous conglomerates of diatom cells. Diatom cells in "colonies" on copepod exoskeleton were interconnected by means of adhesive substances at one of their flexible ends at the point-wise areas at various parts of copepods exoskeleton, and the opposite flexible ends performed various circular roll-over fan-shaped movements around the axis passing through the point of their attachment. "Colonies" behaved as integrated aggressive organisms against any approaching flagellate and prevented normal locomotion of copepods. Herein we present the first report on epizoic behavior of C. closterium: quick disastrous colonization of alive copepods O. davisae by diatom "colonies" led to total extinction of cyclopoid experimental population while alive diatoms formed dense network on copepods degenerative tissues.

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Section: Resultsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

mentioning

confidence: 99%

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How diatom Cylindrotheca closterium vanquish invasive copepod Oithona davisae

Khanaychenko

2018

mbj

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Weekly dynamics of abundance and size structure of specific nanophytoplankton lineages in coastal waters (Baltic Sea)

Piwosz

2019

Limnology & Oceanography

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Nanophytoplankton, the key component of algal communities, remains understudied, thus there is a substantial knowledge gap about dynamics of abundance, biovolume, and cell size of specific algae. Here, I studied weekly changes in abundance, biovolume, cell volume, and cell surface to volume (SV) ratio (> 11,700 cells measured) of specific nanophytoplankton groups using amplicon sequencing and catalyzed reported deposition‐fluorescence in situ hybridization. I applied oligonucleotide probes to study major nanophytoplankton groups: chlorophytes, chrysophytes, pelagophytes, cryptophytes, pedinellids, and haptophytes. I designed three novel probes, two for pedinellid species Apedinella radians and Pseudopedinella elastica, and for a haptophyte genus Haptolina. Chlorophytes were the most abundant group, followed by haptophytes and cryptophytes. Abundance and biovolume of specific groups showed distinct seasonal dynamics and fluctuated up to 100‐fold within a week. Different groups contributed to nanophytoplankton peaks over the season, and this pattern was consistent down to a genus/species level, as shown for cryptophytes, pedinellids, and haptophytes. Inorganic nutrients were the best explanatory variables for abundance and biovolume, but their importance varied for specific groups. Thus, the differences in seasonal dynamics of different algal groups can be explained by temporal niche separation between them. Changes in nanophytoplankton size structure were substantial, and cell volume varied over 104‐fold. However, the size dynamics (variability in cell volume and SV ratio) was lower at genus/species level, indicating changes in nanophytoplankton size structure likely resulted from changes in community composition. Temperature and nutrients best explained the size dynamics, but their explanatory power differed for specific nanophytoplankton groups.

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The non-indigenous Oithona davisae in a Mediterranean transitional environment: coexistence patterns with competing species

Pansera

Camatti

Schroeder

et al. 2021

Sci Rep

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The Venice lagoon (VL) has been recognized as a hot spot of introduction of non-indigenous species (NIS), due to several anthropogenic factors and environmental stressors that combined may facilitate NIS invasions. In the last decades an increasing number of zooplankton NIS have been observed in the VL. This work aims to provide a picture of the annual cycle and distribution of the recently recorded non-indigenous copepod Oithona davisae, considering the coexistence patterns with the congeneric resident Oithona nana. Therefore, zooplankton samplings were carried out monthly from August 2016 to July 2017 at five Long-Term Ecological Research LTER stations in the VL. Oithona davisae showed a persistent occurrence throughout the year with the highest abundances in the warm season and in the inner areas, while the congeneric O. nana, showing a different distribution pattern, resulted more abundant near the inlets of the Lagoon, where O. davisae reached the minimum density. Oithona davisae seems to find local conditions that promote its settlement and distribution, especially in the inner and more trophic lagoon sites. In other European coastal embayments or transitional waters, O. davisae occupied the niche left by the indigenous O. nana or can replace this congeneric species through competitive exclusion mechanisms. Our data indicate that, for now, such species replacement has not occurred in the VL. One of the causes is the extreme variety of habitats and niches offered by this environment allowing a balanced coexistence with O. nana and in general with the resident copepod community.

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Cited by 10 publications

References 45 publications

How diatom Cylindrotheca closterium vanquish invasive copepod Oithona davisae

How diatom Cylindrotheca closterium vanquish invasive copepod Oithona davisae

Weekly dynamics of abundance and size structure of specific nanophytoplankton lineages in coastal waters (Baltic Sea)

The non-indigenous Oithona davisae in a Mediterranean transitional environment: coexistence patterns with competing species

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