Planktonic ciliates Choreotrichida and Strombidiida from the inner zone of Bahía Blanca Estuary, Argentina

Pettigrosso, Rosa E.

doi:10.1590/s0073-47212003000200001

Cited by 22 publications

(31 citation statements)

References 13 publications

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“…This species was also found in the inner zone of Bahia Blanca Estuary, Argentina, where salinity was 29 to 30 psu and temperature 12 to 21°C (Pettigrosso 2003). In the present study, this species was observed to generally be more abundant in Masan Bay than in Onagawa Bay.…”

Section: Vegetative Populationsupporting

confidence: 68%

Morphology and in situ sedimentation of the cysts of a planktonic oligotrich ciliate, Strombidium capitatum

Kim¹,

Ha²,

Taniguchi³

2008

Aquat. Microb. Ecol.

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The cysts of the oligotrich ciliate Strombidium capitatum isolated from the natural sediments in Onagawa Bay, Japan, and Masan Bay, Korea, were described and incubated to produce vegetative cells. The vegetative cells that were obtained were observed after protargol staining and with a scanning microscope and then described. The cysts of S. capitatum were spherical with a papula and spiny surface. Their size varied from 55 to 62 µm in total length and from 45 to 55 µm in width. Seasonal changes in the vegetative population and in sedimentation of the newly formed cysts were investigated in situ in both bays. Planktonic vegetative cells peaked in autumn (December) in Onagawa Bay and in spring (April) in Masan Bay, when water temperature was ca. 15°C. In contrast, the cells were not detected in either bay in summer. Mass encystment occurred in March in Onagawa Bay and in November in Masan Bay without coincidence with the peaks in vegetative populations at either locality. These results indicate that S. capitatum is adapted to low and moderate temperatures and aestivates during warm summer.KEY WORDS: Strombidium capitatum · Cyst morphology · Cyst sedimentation · Oligotrich ciliate · Excystment · Onagawa Bay · Masan Bay Resale or republication not permitted without written consent of the publisherAquat Microb Ecol 53: [173][174][175][176][177][178][179] 2008 We isolated a type of oligotrich cyst possessing a papula from marine sediments in Korean and Japanese embayments facing respectively to the East/Japan Sea and the northwest Pacific, which was identified to be Strombidium capitatum on the basis of the excysted vegetative cells. To illustrate and compare population dynamics in 2 localities, we observed the seasonality of vegetative and cyst populations in the 2 embayments. MATERIALS AND METHODSPlanktonic population and sinking cysts in the water column. Abundance of Strombidium capitatum in the water column was investigated monthly from July 1993 to July 1994 at a station in Onagawa Bay, Japan, and from October 2005 to November 2006 at a station in Masan Bay, Korea (Fig. 1). Average water depths at the stations were 17 and 10 m, respectively. Water samples were collected using a Van Dorn bottle at 0.5, 10, and 15 m (adding 15 m in 1994) in Onagawa Bay and at 0.5 m in Masan Bay. The samples were fixed immediately in Bouin's solution at a final concentration of 5% and then treated with the quantitative protargol staining (QPS) method (Montagnes & Lynn 1987). Water temperature and salinity were recorded using a digital bathythermograph. Chlorophyll a (chl a) concentration in Onagawa Bay was measured for 2 size fractions using in vivo fluorometry.In Onagawa Bay, sinking cysts were collected with a cylindrical sediment trap of 58 cm in height and 14 cm in inner diameter. The basic configuration of the trap is given by Sasaki & Nishizawa (1981). The trap was deployed at 12 m depth intermittently, typically for 3 to 7 d mo -1 from July 1993 to July 1994. Although a similar cylindrical trap of 45 cm in heigh...

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Section: Vegetative Populationsupporting

confidence: 68%

Morphology and in situ sedimentation of the cysts of a planktonic oligotrich ciliate, Strombidium capitatum

Kim¹,

Ha²,

Taniguchi³

2008

Aquat. Microb. Ecol.

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“…The PCA results revealed that the biomass of the phytoplankton-aloricate ciliate community in the Bahía Blanca Estuary showed a seasonal variability. At least twenty-four different aloricate ciliate taxa were recorded during the annual cycle in the Bahía Blanca estuary, of which seven were later identified to species level using the protargol staining method (PETTIGROSSO, 2003). The assembly of winter dates consisted of large-sized ciliates preying on blooming diatoms, characterized principally by heterotrophic choreotrichs and mixotrophic oligotrichs belonging to the Strombidinopsis and Strombidium genera.…”

Section: Ciliate and Phytoplankton Biomassmentioning

confidence: 99%

“…The assembly of winter dates consisted of large-sized ciliates preying on blooming diatoms, characterized principally by heterotrophic choreotrichs and mixotrophic oligotrichs belonging to the Strombidinopsis and Strombidium genera. The most conspicuous species were Strombidinopsis elongata (97-129 µm in length, 74-82 µm in width) and the mixotrophic Strombidium emergens (27-39 µm in length, 19.5-30 µm in width) (PETTIGROSSO, 2003). Large species like Cyrtostrombidium sp.…”

Section: Ciliate and Phytoplankton Biomassmentioning

confidence: 99%

“…In spring, Strobilidium epacrum (length 35-55 µm, 31-47µm width), the mixotrophic Strombidium capitatum (23-55 µm length, 39-55 µm width) (PETTIGROSSO, 2003) and a large Strombidinopsis sp. were common, being present during the last phase of the phytoplankton bloom which was characterized by larger blooming and non-blooming species, such as Guinardia delicatula and Scripsiella trochoidea.…”

Section: Ciliate and Phytoplankton Biomassmentioning

confidence: 99%

“…Little is known about the global distribution of aloricate planktonic ciliates, but in terms of abundance, biomass and production they have been found to be more important than tintinnids in estuarine, coastal and pelagic waters (SMETACEK, 1981;PIERCE;TURNER, 1992;LEAKEY et al, 1992;PETZ, 1999;TAKASHI;TANIGUCHI, 2003). Some quantitative studies have been carried out on the ciliates of the Bahía Blanca Estuary (BARRIA DE CAO, 1992;BARRIA DE CAO et al, 1997;PETTIGROSSO et al, 1997;BARRIA DE CAO, 2007), but in this area, however, no information is available about the seasonal patterns and trophic relationships of the aloricated planktonic ciliates.…”

Section: Introductionmentioning

confidence: 99%

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Phytoplankton-aloricate ciliate community in the Bahía Blanca Estuary (Argentina): seasonal patterns and trophic groups

Pettigrosso

Popovich

2009

Braz. j. oceanogr.

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A B S T R A C TThe seasonal pattern of the phytoplankton-aloricate ciliate community is an adequate indicator of trophic coupling and nutrient cycling in coastal environments. The size-fractionated, abundance, biomass and composition of a phytoplankton-aloricate ciliate community were ascertained in the Bahía Blanca Estuary from February 1994 to February 1995. In addition, ciliate production and excretion rates by size class were estimated. A winter-early spring diatom bloom was the most important event in the annual cycle. To evaluate the significance of phytoplankton size in the food web, <25 µm and > 25 µm fractions of chlorophyll a were determined; the < 25 µm fraction was dominant. To classify the ciliate community in trophic groups, it was divided into volume-size classes, from <10 3 µm 3 to > 10 5 µm 3 ; this wide range of size indicated the potential prey. The smaller ciliates dominated abundance but the larger ones dominated biomass. Values of total ciliates, ranging from 0.2 to 5.2 x 10 3 cells L -1 and 0.55 to 83.9 µg C L -1 , and levels of total chlorophyll a reached 40.4 µg L -1 and were higher than those recorded for other temperate estuarine systems. The smaller ciliates were potentially important as nitrogen regenerators in summer and spring, when their estimated production was highest. The annual potential production of 3 mg C L -1 represents a reference parameter from which possible changes in the trophic status of this environment could be predicted. R E S U M OO padrão sazonal da comunidade de fitoplâncton-ciliados aloricados é um indicador adequado das relações tróficas e reciclagem de nutrientes nos ambientes costeiros. A abundância, biomassa e composição da comunidade de fitoplâncton-ciliados foram determinadas por classes de tamanho durante um ciclo anual no estuário de Bahía Blanca. Além disso, foram estimadas também a produção e as taxas de excreção de ciliados. Uma floração de diatomáceas no período de fim de inverno e início de primavera foi o acontecimento mais importante do ciclo anual. Para avaliar a significância do tamanho do fitoplâncton em relação ao tamanho dos ciliados, foram determinadas as frações de clorofila de < 25µm e > 25 µm. A fração < 25µm foi dominante. As classes de tamanho dos ciliados determinadas entre < 10 3 a > 10 5 µm 3 foram indicadoras da presença de diferentes grupos tróficos e, consequentemente, da variedade das suas presas potenciais. Os ciliados pequenos dominaram em abundância e os maiores em biomassa. A abundância total de ciliados variou de 0,2 a 5,2 x 10 3 células L -1 e de 0,55 a 83,9 µg C L -1 . A concentração de clorofila a total de até 40,4 µg L -1 foi superior às registradas em outros sistemas de estuários em regiões temperadas. Os ciliados menores foram importantes como regeneradores de nitrogênio no verão e na primavera, quando a sua produção estimada foi mais alta. A produção potencial anual de 3 mg C L -1 representa um importante parâmetro de referência na qual possíveis mudanças do status trófico deste ambiente podem ser previstas.

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Plankton Ecology and Biodiversity in the Bahía Blanca Estuary

Berasategui

Dutto

Abbate

et al. 2021

The Bahía Blanca Estuary

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Planktonic ciliates Choreotrichida and Strombidiida from the inner zone of Bahía Blanca Estuary, Argentina

Cited by 22 publications

References 13 publications

Morphology and in situ sedimentation of the cysts of a planktonic oligotrich ciliate, Strombidium capitatum

Morphology and in situ sedimentation of the cysts of a planktonic oligotrich ciliate, Strombidium capitatum

Phytoplankton-aloricate ciliate community in the Bahía Blanca Estuary (Argentina): seasonal patterns and trophic groups

Plankton Ecology and Biodiversity in the Bahía Blanca Estuary

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