Seasonal changes in the density and vertical distribution of nauplii, copepodites and adults of the genera Oithona and Oncaea (Copepoda) in the surface water of Toyama Bay, southern Sea of Japan

Takahashi, Takashi; Uchiyama, Isamu

doi:10.3800/pbr.3.143

Cited by 12 publications

(4 citation statements)

References 16 publications

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“…Seasonal and vertical factors are several factors that can affect the abundance of Nauplius copepod within waters. Based on the previous research done by Takahashi and Uchiyama (2008), within Toyama Bay, it was found that the abundance of Naupliuscopepod genus occurred in every seasons. However, that thing is highly depend on the endurance of each species into changes within environment's condition.…”

Section: Composition and Abundance Of Phytoplankton Within Watersmentioning

confidence: 92%

Analysis of Food Composition of Yellowstripe Trevally (Selaroidesleptolepis) In Paciran Waters, Lamongan, East Java

Pratiwi

Yona

Mulyanto

et al. 2016

RJLS

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Paciran is one of the regions in East Java with great fisheries potential. Yellow Stripe Trevally is well known for its abundance in waters and categorized as high economic value within fisheries commodity. The abundance of yellow stripe trevally highly depends on food availability within its living habitat. The aim of this study was to analyse yellow stripe trevally food composition and its relationship with plankton abundance. The result of this study shows that phytoplankton abundance (21,600x10 3 cell/m 3) was found higher than zooplankton abundance (9.093x10 3 ind/m 3). The highest abundance of phytoplankton was found in Bacillariophycae (21,552x10 3 cell/m 3) and the lowest was found in Coscinodiscophyceae (48.197x10 3 cell/m 3). Between two classes of zooplankton found in this study, the abundance of Maxillopoda class (8.184x10 3 ind/m 3) was found higher than Oligotriceae class (0.909x10 3 ind/m 3). The composition of plankton in the stomach of yellow stripe trevally have similar pattern with the compositions of plankton in the waters. Based on the calculation of electivity index, there were seven genus that have a value 0

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Section: Composition and Abundance Of Phytoplankton Within Watersmentioning

confidence: 92%

Analysis of Food Composition of Yellowstripe Trevally (Selaroidesleptolepis) In Paciran Waters, Lamongan, East Java

Pratiwi

Yona

Mulyanto

et al. 2016

RJLS

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“…These studies and some others, including the more recent ones, were focused on the distribution of so-called net zooplankton, in which meso-and macrozooplankton fractions dominate, while the issue of distribution of metazoan microzooplankton (hereinafter MM) has not been studied. MM fraction is represented primarily by copepod naupliar stages; they used to be sampled by Niskin bottles (Seregin & Popova, 2016a ;Takahashi & Uchiyama, 2008 ;Ueda, 1987), by specialized plankton nets with a mesh size of less than 60-70 µm (Uye & Sano, 1995), or by other devices (Kršinić & Grbec, 2012). In general, crustaceans could contribute up to 90 % of total MM abundance.…”

mentioning

confidence: 99%

“…MM habitat of holo-and meroplanktonic organisms in the Black Sea is constrained by the upper 50-100-m layer. Vertical distribution varies for different zooplankton species, sizes, and ontogenetic fractions (Kovalev, 1967 ;Shmeleva & Zaika, 1973 ;Takahashi & Uchiyama, 2008 ;Trudnowska et al, 2015 ;Ueda, 1987). It is influenced by season and hydrographic conditions (Takahashi & Uchiyama, 2008 ;Trudnowska et al, 2015), including the presence of thermo-, halo-, and pycnoclines (Landaeta et al, 2013 ;Lougee et al, 2002), wind mixing (Lagadeuc et al, 1997), and many other factors.…”

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confidence: 99%

Some peculiarities in vertical distribution of metazoan microzooplankton in the Black Sea in spring

Seregin

2020

mbj

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Based on material, received in the 84th and 93rd cruises of the RV “Professor Vodyanitsky”, vertical distribution of microplankton fraction of metazooplankton (MM) in the Black Sea in spring was analyzed. A total of 27 stations were examined both in the coastal zone and in the deep sea. The 10-L bottles of the CTD probes “Mark-III Neil Brown” and “Sea Bird 911” were used to collect 4–6 L of water from 4–11 horizons of the water column. The samples obtained were concentrated by the reverse filtration through the plankton net with the mesh size of 10 µm. Quantitative and systematic analysis of all samples was carried out totally in the Bogorov chamber using an MBS-9 stereo microscope. The main factors determining nature of the distribution are MM species composition, physical structure of the water column, and hydrodynamic processes affecting its stability/instability. Nauplii of Black Sea Copepoda and veligers of Bivalvia were the most numerous systematic groups in “spring” MM. Mollusc veligers determined abundance maxima in the lower layers of shallow water habitats, while copepods prevailed over large depths and determined total abundance peaks in the upper and middle water layers. Daily time series experiment showed that advective hydrodynamic processes can significantly affect MM vertical distribution, changing physical structure of the water column. For some species, in most cases, a correlation of their distribution with vertical profiles of temperature and salinity was revealed, which rarely manifested at total MM abundance level. A comparison of two spring seasons (2016 and 2017) showed the relationship between vertical distribution of MM abundance and temperature to be more pronounced in cases of low temperature. A change in the sign of correlation with temperature was detected during spring season for Oithona similis: an initially cold-loving species of Black Sea copepods. This revealed in a more superficial distribution of the maxima abundance of this species at lower seasonal temperatures, which could reflect a shift in temperature optimum for the species population and play the role of an adaptive reaction in conditions of seasonal changes in sea thermal characteristics.

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“…Patterns of vertical distribution have been poorly studied on cyclopoid copepods, and only a few studies have addressed this topic on Oithona (Kosobokova 1980;Gislason 2008;Tanimura et al 2008;Takahashi and Uchiyama 2008;Saiz et al 2013) to deeper waters when they became larger, however, is not particular of Oithona, since it is widespread among neritic planktonic copepods.…”

Section: Distributionmentioning

confidence: 99%

Ecology of the marine copepod genus Oithona

Zamora Terol

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Copepods have a crucial role in the pelagic marine ecosystem, for their participation in the nutrient cycling and carbon export in biogeochemical cycles, and their role as link organisms between primary producers and higher trophic levels. Historically, marine zooplankton studies have focused on large organism (> 1mm), due to the use of relatively large mesh sizes in plankton nets, which has resulted in an underestimation of the importance of small copepods such as the genus Oithona. The study of small copepods, and especiall of Oithona, has raised special interest in recent years due to its great abundance and ubiquitous presence in both coastal and oceanic regions, and with a distribution that extends from polar to tropical . Besides their numerical dominance, Oithona also makes up a significant fraction of the biomass of copepods in certain regions. Their described low metabolic rates, coupled with an ambush feeding behavior and low mortality, are considered the clue of their success and of their capacity to maintain active populations throughout the year. Although new insights on the ecology of Oithona have been acquired in the past decade, knowledge on their vital rates is still very scarce. The lack of studies on the ecophysiology of Oithona contrasts with the large amount of studies conducted on calanoid copepods on aspects related to feeding, growth, and egg production. The main objective of this thesis was to contribute to a better knowledge and understanding of some biological and ecological aspects of the genus Oithona. For that purpose, we carried out laboratory experiments with cultured specimens, and experimental lab and fieldwork with natural populations in polar and tropical regions. In the laboratory we studied the effect of food concentration on ingestion and fecundity rates of Oithona davisae. The results obtained indicate that Oithona davisae is able to feed at very low food concentrations, which indicates its ability to exploit oligotrophic environments. Oithona capacity to reproduce continuously throughout the year, even in environments or periods of low food availability, was confirmed by the relatively high fertility rates observed in laboratory experiments at low food concentrations. The trophic role of Oithona, their natural diet and ingestion rates were studied in different pelagic ecosystems; as well as the fecudity of adult females in these ecosystems, and their relationship with environmental factors. We also investigated some aspects of the population ecology Oithona in polar regions (abundance, vertical distribution and migration patterns). The results of the in situ investigations were carried out in order to compare life strategies between Oithona species of contrasting habitats. In polar environments, winter reproductive activity of the adult females was observed, which highlights the importance of small copepods in high-latitude environments, especially when large calanoid are not present in the productive zone of the water column. Moreover, the strategy of Oithona life in polar area is different from that of large calanoid, and it benefits from its independence from the spring blooms of phytoplankton to maintain active populations throughout the year. The ability of Oithona to successfully survive when unfavourable conditions are present in the water could explain the success of this genus of copepods in marine environments around the world.

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Seasonal changes in the density and vertical distribution of nauplii, copepodites and adults of the genera Oithona and Oncaea (Copepoda) in the surface water of Toyama Bay, southern Sea of Japan

Cited by 12 publications

References 16 publications

Analysis of Food Composition of Yellowstripe Trevally (Selaroidesleptolepis) In Paciran Waters, Lamongan, East Java

Analysis of Food Composition of Yellowstripe Trevally (Selaroidesleptolepis) In Paciran Waters, Lamongan, East Java

Some peculiarities in vertical distribution of metazoan microzooplankton in the Black Sea in spring

Ecology of the marine copepod genus Oithona

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