journal
https://read.qxmd.com/read/37012972/ingestion-rate-estimated-from-food-concentration-and-predatory-role-of-copepod-nauplii-in-the-microbial-food-web-of-temperate-embayment-waters
#21
JOURNAL ARTICLE
Youta Sugai, Noriaki Natori, Kenji Tsuchiya, Megumi Nakagawa, Makio C Honda, Shinji Shimode, Tatsuki Toda
To quantitatively evaluate the role of copepod nauplii as predators in the microbial food web, the ingestion rate (IR) of copepod nauplii and the food requirement (FR) of microzooplankton were estimated monthly for 3 consecutive years in temperate embayment waters. The IR of dominant copepod nauplii ( Acartia spp. nauplii) was estimated from water temperature, individual carbon weight and food concentration and peaked (>0.50 μgC ind-1 d-1 ) with relatively high food concentration (>57.5 μgC L-1 )...
2023: Journal of Plankton Research
https://read.qxmd.com/read/36751485/half-century-trends-in-alpha-and-beta-diversity-of-phytoplankton-summer-communities-in-the-helsinki-archipelago-the-baltic-sea
#22
JOURNAL ARTICLE
Kalle Olli, Emil Nyman, Timo Tamminen
We analyzed phytoplankton biodiversity trends in a 52 year (1967-2018) monitoring time-series from the archipelago of Helsinki, Gulf of Finland, the Baltic Sea. The community ordination revealed strong ordering of samples along the time axis (generalized additive model-gam fit: R 2  = 0.9). Species richness increased in time and was the most influential alpha diversity descriptor related to the community structure (gam fit: R 2  = 0.56-0.70). Changes in species richness accounted for 35-36% of the mean between-sample beta diversity...
2023: Journal of Plankton Research
https://read.qxmd.com/read/36751484/mucilage-protects-the-planktonic-desmid-staurodesmus-sp-against-parasite-attack-by-a-chytrid-fungus
#23
JOURNAL ARTICLE
Silke Van Den Wyngaert, Martin J Kainz, Robert Ptacnik
Zoosporic fungi of the phylum Chytridiomycota are ubiquitous parasites of phytoplankton in aquatic ecosystems, but little is known about phytoplankton defense strategies against parasitic chytrid attacks. Using a model chytrid-phytoplankton pathosystem, we experimentally tested the hypothesis that the mucilage envelope of a mucilage-forming desmid species provides protection against the parasitic chytrid Staurastromyces oculus . Mucilage-forming Staurodesmu s cells were not accessible to the chytrid, whereas physical removal of the mucilage envelope rendered the same Staurodesmus sp...
2023: Journal of Plankton Research
https://read.qxmd.com/read/36751483/tropical-cyclones-what-are-their-impacts-on-phytoplankton-ecology
#24
JOURNAL ARTICLE
Peter A Thompson, Hans W Paerl, Lisa Campbell, Kedong Yin, Karlie S McDonald
Following the passage of a tropical cyclone (TC) the changes in temperature, salinity, nutrient concentration, water clarity, pigments and phytoplankton taxa were assessed at 42 stations from eight sites ranging from the open ocean, through the coastal zone and into estuaries. The impacts of the TC were estimated relative to the long-term average (LTA) conditions as well as before and after the TC. Over all sites the most consistent environmental impacts associated with TCs were an average 41% increase in turbidity, a 13% decline in salinity and a 2% decline in temperature relative to the LTA...
2023: Journal of Plankton Research
https://read.qxmd.com/read/36045951/trade-offs-between-risks-of-predation-and-starvation-in-larvae-make-the-shelf-break-an-optimal-spawning-location-for-atlantic-bluefin-tuna
#25
JOURNAL ARTICLE
Taylor A Shropshire, Steven L Morey, Eric P Chassignet, Mandy Karnauskas, Victoria J Coles, Estrella Malca, Raúl Laiz-Carrión, Øyvind Fiksen, Patricia Reglero, Akihiro Shiroza, José M Quintanilla Hervas, Trika Gerard, John T Lamkin, Michael R Stukel
Atlantic bluefin tuna (ABT) ( Thunnus thynnus ) travel long distances to spawn in oligotrophic regions of the Gulf of Mexico (GoM) which suggests these regions offer some unique benefit to offspring survival. To better understand how larval survival varies within the GoM a spatially explicit, Lagrangian, individual-based model was developed that simulates dispersal and mortality of ABT early life stages within realistic predator and prey fields during the spawning periods from 1993 to 2012. The model estimates that starvation is the largest cumulative source of mortality associated with an early critical period...
September 2022: Journal of Plankton Research
https://read.qxmd.com/read/36045950/plankton-food-webs-in-the-oligotrophic-gulf-of-mexico-spawning-grounds-of-atlantic-bluefin-tuna
#26
JOURNAL ARTICLE
Michael R Stukel, Trika Gerard, Thomas B Kelly, Angela N Knapp, Raúl Laiz-Carrión, John T Lamkin, Michael R Landry, Estrella Malca, Karen E Selph, Akihiro Shiroza, Taylor A Shropshire, Rasmus Swalethorp
We used linear inverse ecosystem modeling techniques to assimilate data from extensive Lagrangian field experiments into a mass-balance constrained food web for the Gulf of Mexico open-ocean ecosystem. This region is highly oligotrophic, yet Atlantic bluefin tuna (ABT) travel long distances from feeding grounds in the North Atlantic to spawn there. Our results show extensive nutrient regeneration fueling primary productivity (mostly by cyanobacteria and other picophytoplankton) in the upper euphotic zone. The food web is dominated by the microbial loop (>70% of net primary productivity is respired by heterotrophic bacteria and protists that feed on them)...
September 2022: Journal of Plankton Research
https://read.qxmd.com/read/35898815/estimating-genotypic-richness-and-proportion-of-identical-multi-locus-genotypes-in-aquatic-microalgal-populations
#27
JOURNAL ARTICLE
Ingrid Sassenhagen, Deana L Erdner, Bryan C Lougheed, Mindy L Richlen, Conny SjÖqvist
The majority of microalgal species reproduce asexually, yet population genetic studies rarely find identical multi-locus genotypes (MLG) in microalgal blooms. Instead, population genetic studies identify large genotypic diversity in most microalgal species. This paradox of frequent asexual reproduction but low number of identical genotypes hampers interpretations of microalgal genotypic diversity. We present a computer model for estimating, for the first time, the number of distinct MLGs by simulating microalgal population composition after defined exponential growth periods...
July 2022: Journal of Plankton Research
https://read.qxmd.com/read/35898814/notable-predominant-morphology-of-the-smallest-most-abundant-protozoa-of-the-open-ocean-revealed-by-electron-microscopy
#28
JOURNAL ARTICLE
Nina A Kamennaya, Gabrielle Kennaway, Michael A Sleigh, Mikhail V Zubkov
In the microbe-driven ecosystems of the open ocean, the small heterotrophic flagellates (sHF) are the chief microbial predators and recyclers of essential nutrients to phototrophic microbes. Even with intensive molecular phylogenetic studies of the sHF, the origins of their feeding success remain obscure because of limited understanding of their morphological adaptations to feeding. Here, we examined the sHF morphologies in the largest, most oligotrophic South Pacific and Atlantic (sub)tropical gyres and adjacent mesotrophic waters...
July 2022: Journal of Plankton Research
https://read.qxmd.com/read/35898813/the-ongoing-need-for-rates-can-physiology-and-omics-come-together-to-co-design-the-measurements-needed-to-understand-complex-ocean-biogeochemistry
#29
REVIEW
Robert F Strzepek, Brook L Nunn, Lennart T Bach, John A Berges, Erica B Young, Philip W Boyd
The necessity to understand the influence of global ocean change on biota has exposed wide-ranging gaps in our knowledge of the fundamental principles that underpin marine life. Concurrently, physiological research has stagnated, in part driven by the advent and rapid evolution of molecular biological techniques, such that they now influence all lines of enquiry in biological oceanography. This dominance has led to an implicit assumption that physiology is outmoded, and advocacy that ecological and biogeochemical models can be directly informed by omics...
July 2022: Journal of Plankton Research
https://read.qxmd.com/read/35664086/increasing-temperature-and-prey-availability-affect-the-growth-and-swimming-kinematics-of-atlantic-herring-clupea-harengus-larvae
#30
JOURNAL ARTICLE
Bridie J M Allan, Howard I Browman, Steven Shema, Anne-Berit Skiftesvik, Arild Folkvord, Caroline M F Durif, Olav Sigurd Kjesbu
Climate change will increase the magnitude and duration of warming events and the variability in the phenology and abundance of available prey to the early life stages of fish. These factors influence physiological, behavioral and ecological processes, impacting growth, development and survival. Using a fully factorial design with two prey-availability treatments (1200 prey items L-1 (high prey abundance) or 40 prey items L-1 (low prey abundance)) under three temperature regimes (8, 10 and 12°C), the swimming kinematics of 6-week old spring-spawning Atlantic herring larvae were examined using silhouette video photography...
May 2022: Journal of Plankton Research
https://read.qxmd.com/read/35664085/determination-of-optical-markers-of-cyanobacterial-physiology-from-fluorescence-kinetics
#31
JOURNAL ARTICLE
Emilie Courtecuisse, Kevin Oxborough, Gavin H Tilstone, Evangelos Spyrakos, Peter D Hunter, Stefan G H Simis
Compared to other methods to monitor and detect cyanobacteria in phytoplankton populations, fluorometry gives rapid, robust and reproducible results and can be used in situ . Fluorometers capable of providing biomass estimates and physiological information are not commonly optimized to target cyanobacteria. This study provides a detailed overview of the fluorescence kinetics of algal and cyanobacterial cultures to determine optimal optical configurations to target fluorescence mechanisms that are either common to all phytoplankton or diagnostic to cyanobacteria...
May 2022: Journal of Plankton Research
https://read.qxmd.com/read/35664084/reduction-in-thermal-stress-of-marine-copepods-after-physiological-acclimation
#32
JOURNAL ARTICLE
Enric Saiz, Kaiene Griffell, Manuel Olivares, Montserrat Solé, Iason Theodorou, Albert Calbet
We studied the phenotypic response to temperature of the marine copepod Paracartia grani at the organismal and cellular levels. First, the acute (2 days) survival, feeding and reproductive performances at 6-35°C were determined. Survival was very high up to ca. 30°C and then dropped, whereas feeding and fecundity peaked at 23-27°C. An acclimation response developed after longer exposures (7 days), resulting in a decline of the biological rate processes. As a consequence, Q10 coefficients dropped from 2...
May 2022: Journal of Plankton Research
https://read.qxmd.com/read/35356360/similarities-between-the-biochemical-composition-of-jellyfish-body-and-mucus
#33
JOURNAL ARTICLE
Nathan Hubot, Sarah L C Giering, Cathy H Lucas
Recognition of the importance of jellyfish in marine ecosystems is growing. Yet, the biochemical composition of the mucus that jellyfish constantly excrete is poorly characterized. Here we analyzed the macromolecular (proteins, lipids and carbohydrates) and elemental (carbon and nitrogen) composition of the body and mucus of five scyphozoan jellyfish species ( Aurelia aurita , Chrysaora fulgida , Chrysaora pacifica , Eupilema inexpectata and Rhizostoma pulmo ). We found that the relative contribution of the different macromolecules and elements in the jellyfish body and mucus was similar across all species, with protein being the major component in all samples (81 ± 4% of macromolecules; 3...
March 2022: Journal of Plankton Research
https://read.qxmd.com/read/35356359/phytoplankton-and-particle-size-spectra-indicate-intense-mixotrophic-dinoflagellates-grazing-from-summer-to-winter
#34
JOURNAL ARTICLE
Ovidio García-Oliva, Florian M Hantzsche, Maarten Boersma, Kai W Wirtz
Mixotrophic dinoflagellates (MTD) are a diverse group of organisms often responsible for the formation of harmful algal blooms. However, the development of dinoflagellate blooms and their effects on the plankton community are still not well explored. Here we relate the species succession of MTD with parallel changes of phytoplankton size spectra during periods of MTD dominance. We used FlowCAM analysis to acquire size spectra in the range 2-200 μm every one or two weeks from July to December 2007 at Helgoland Roads (Southern North Sea)...
March 2022: Journal of Plankton Research
https://read.qxmd.com/read/36644338/sex-in-the-wild-repeated-observations-of-planktonic-ciliate-conjugation-from-field-samples
#35
JOURNAL ARTICLE
Filomena Romano, Katerina Symiakaki, Paraskevi Pitta
Ciliate conjugation is considered a rare event to encounter in the field and it is mostly reported from cultures. In this work, we describe a synchronized conjugation event of planktonic ciliates that was discovered twice; in September 2019, at two different locations in the Cretan Sea, Eastern Mediterranean, and in October 2020. In 2019, first, at 2 m depth of the coastal station POSEIDON-HCB, in samples fixed with acid Lugol and formaldehyde, we found 340 and 200 mating pairs L-1 of different ciliate species, respectively; and second, at the Heraklion port, we found 220 mating pairs L-1 of Strombidinopsis sp...
2022: Journal of Plankton Research
https://read.qxmd.com/read/36479192/on-the-different-role-of-alarm-substances-and-fish-kairomones-in-diapause-induction-in-a-freshwater-planktonic-crustacean
#36
JOURNAL ARTICLE
Kazimierz Więski, Mirosław Ślusarczyk
Many aquatic organisms anticipate predation risk via infochemical detection. In a laboratory experiment, we investigated the expression of life-history responses in planktonic Daphnia magna under long-lasting exposure to various concentrations of fish kairomones (FK) and alarm substances of Daphnia (AS). Daphnia were exposed to one of six concentrations of AS (0, 0.0005, 0.005, 0.05, 0.5, 5 homogenized D. magna /L) mixed with the highest concentration of FK, or to one of six concentrations of FK (diluted fish feces of 0, 0...
2022: Journal of Plankton Research
https://read.qxmd.com/read/36447781/the-role-of-oceanographic-conditions-and-colony-size-in-shaping-the-spatial-structure-of-pyrosoma-atlanticum-in-the-nw-mediterranean-sea
#37
JOURNAL ARTICLE
Marina Pastor-Prieto, Ana SabatÉs, Vanesa Raya, Antonio Canepa, TomÁs I Parraguez, Josep-Maria Gili
This study investigates the role of winter oceanographic conditions on the horizontal and vertical spatial structure of Pyrosoma atlanticum at different ontogenetic stages. Data were obtained on two oceanographic cruises (February 2017 and 2018) in the NW Mediterranean. Small colonies were exceptionally abundant in 2017, linked to an earlier development of spring conditions and the subsequent seasonal phytoplankton bloom. The mesoscale distribution of P. atlanticum differed depending on the colony size. Large colonies (≥7 mm) were found on the slope all along the density front, whereas small (<4 mm) and medium colonies (4-6...
2022: Journal of Plankton Research
https://read.qxmd.com/read/36447780/the-short-term-effects-of-planktivorous-fish-foraging-in-the-presence-of-artificial-light-at-night-on-lake-zooplankton
#38
JOURNAL ARTICLE
Joanna Tałanda, Piotr Maszczyk, Ewa Babkiewicz, Katarzyna Rutkowska, Mirosław Ślusarczyk
Numerous studies have revealed that artificial light at night alters the natural patterns of light in space and time and may have various ecological impacts at different ecological levels. However, only a few studies have assessed its effect on interactions between organisms in aquatic environments, including predator-prey interactions in lakes. To fill this gap, we performed a preliminary enclosure experiment in which we compared the foraging effect of juvenile perch ( Perca fluviatilis ) on a natural lake zooplankton community in the absence and presence of light of high-pressure sodium (HPS) lamps mimicking artificial light emitted by a boat...
2022: Journal of Plankton Research
https://read.qxmd.com/read/36447779/novel-combination-coccospheres-from-helicosphaera-spp-indicate-complex-relationships-between-species
#39
JOURNAL ARTICLE
Daniela Sturm, Gerald Langer, Glen Wheeler
Coccolithophores play an important role in global biogeochemical cycling, but many aspects of their ecology remain poorly understood, including their heteromorphic haplo-diplontic life cycle. The presence of combination coccospheres in environmental samples, which represent a transition between the lightly calcified haploid (HOL) and heavily calcified diploid (HET) life phases, provides crucial evidence linking the two life cycle phases of a particular species. Here, we describe combination coccospheres from the Southern Ocean that show a novel association between Helicosphaera hyalina (HET) and Helicosphaera HOL catilliferus type...
2022: Journal of Plankton Research
https://read.qxmd.com/read/36447778/changes-in-phytoplankton-community-structure-over-a-century-in-relation-to-environmental-factors
#40
JOURNAL ARTICLE
Elisabeth Lundsør, Wenche Eikrem, Leif Christian Stige, Anette Engesmo, Sandra Gran Stadniczeñko, Bente Edvardsen
Changes in phytoplankton abundance and biomass during the period 1933-2020 were examined by statistical modeling using data from the Inner Oslofjorden phytoplankton database. The phytoplankton abundances increased with eutrophication from 1930s to 1970s, but with the implementation of sewage cleaning measures and a resulting reduction in nutrient releases, the phytoplankton abundance has since then decreased significantly. The onset of the seasonal blooms has started progressively later during the last 15 years, especially the spring bloom...
2022: Journal of Plankton Research
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