Medusae and ctenophores from the Bahía Blanca Estuary and neighboring inner shelf (Southwest Atlantic Ocean, Argentina)

Dutto, M. Sofía; Genzano, Gabriel N.; Schiariti, Agustín; Lecanda, Julieta; Hoffmeyer, Mónica S.; Pratolongo, Paula Daniela

doi:10.1186/s41200-017-0114-1

Cited by 15 publications

(20 citation statements)

References 31 publications

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“…The occurrence of L . tetraphylla in El Rincón region and massive accumulations in recent years reveal that its abundance distribution is expanding southwards [50]. Changes in the latitudinal distribution and abundance patterns of the species are one of the signals of climate warming, and warm-water species abundances would be positively favored [10,19,51,52].…”

Section: Discussionmentioning

confidence: 99%

“…Obelia hydroids, on the other hand, may be benefited by both natural (biotic and abiotic) and man-made substrates [64,68] and by the availability of organic matter and microplankton as food resource [71]. The turbid, shallow, and eutrophic coastal ecosystems encompassed by El Rincón region may widely cover these requirements [50,65,72,73]. Furthermore, this area seems to enclose a proper environment not only for Obelia but also for other meroplanktonic hydromedusan species that may have similar environmental needs [50,65,72,74].…”

Section: Discussionmentioning

confidence: 99%

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Macroscale abundance patterns of hydromedusae in the temperate Southwestern Atlantic (27°–56° S)

et al. 2019

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Gelatinous organisms are crucial components of marine ecosystems and some species imply social and economic consequences. However, certain geographic areas, such as the temperate Southwestern Atlantic (SWA, 27° - 56° S), remain understudied in terms of jellyfish ecological data. We analyzed 3,727 plankton samples collected along ~6.7 million km 2 over a 31-year period (1983–2014) to determine the occurrence, abundance, and diversity patterns of hydromedusae in the SWA. Analyses were made at both community and species levels. Two abundance hot spots of hydromedusae were identified, where values up to 2,480 ind. m -3 were recorded between 2003 and 2014. Liriope tetraphylla and Obelia spp. were the main responsible for recurrent peaks. Diversity indexes were in the range of those published for temperate areas worldwide, and some coastal zones showed values that can be considered moderate to high for a temperate neritic region. The community analysis yielded 10 groups following previously determined biogeographic schemes throughout the study area. This work enhances the knowledge of hydromedusae in the SWA and provides essential information about the current global warming context and the gelatinous zooplankton data necessity.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Macroscale abundance patterns of hydromedusae in the temperate Southwestern Atlantic (27°–56° S)

et al. 2019

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“…The hauls were done using a plankton net of 200 µm-mesh and 0.30 m diameter with a solid cod end to avoid damage to the specimens. Subsequently, each haul was filtered through a 1.5 mm sieve to remove the predominant mesozooplanktonic predators, such as Parasagitta sp., ichtyoplankton, small jellyfish and ctenophores (Hoffmeyer, 2007;Dutto et al, 2017). Then, the sample was placed in 10 L bottles and transported in a thermal container to maintain the environmental temperature (~ one hour) until arrival at the laboratory.…”

Section: Sampling Procedures and Methodsmentioning

confidence: 99%

Size-fractionated chitin contribution to seston, with linkages to the copepod Acartia

Biancalana

Berasategui

2020

Ocean Coast. Res.

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Size-fractionated chitin contribution to seston, with linkages to the copepod Acartia The main purpose of the present work was to determine chitin from experimental size-fractioned incubations of the copepod Acartia tonsa, considered one of the primary sources of chitin in the Bahía Blanca Estuary. Sampling was performed during the austral warm season at one station in 2014 and 2015. Field-collected females (200 individuals) and males (100 individuals) were incubated in 8 L containers in the laboratory simulating in situ environmental conditions of temperature and salinity for 72 hours. Chitin content was measured in different size fractions (20-60, 60-135 and ≥135 μm). Particulate organic matter and dry weight were also determined in the different size fractions. Highly agglutinated debris, pellets, and natural food (diatoms and tintinnids) were observed in the 20-60 μm size fraction, with a maximum of 0.68±0.21mg L-1 chitin, and the highest contribution of chitin to POC (34.62±18.50 %). Eggs, nauplii and natural food (diatoms and tintinnids) were observed in the 60-135 μm size fraction, with a maximum of 0.20±0.12 mg L-1 chitin and a contribution to POC of 9.80±5.00 %. Acartia adults and their exuviae were observed in the ≥135 μm size fraction, with a maximum concentration of chitin of 0.67±0.40, and a maximum contribution of chitin to POC TS of 30.47±27.23 %. Differences were detected between the different fractions in chitin, POC and DW, indicating that the 20-60 and ≥135 µm size fractions were both an important contribution of chitin in the experiment. Our results suggest that pellets, carcasses and exuviae along with natural food and organic aggregates were the main source of chitin in this system.

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“…This result was based on the coastline orientation (E to W) which allows that N winds cause coastal upwellings removing surface waters and producing the emergence of the bottom layer, promoting that medusae inhabiting in it reach the coast (Mianzan & Zamponi, 1988). Extremely high abundances has been commonly reported in the region (Mianzan et al, 2001;Chiaverano et al, 2004) but since the summer 2013, medusae of O. sambaquiensis have not been observed in the coastal waters of Monte Hermoso and surrounding areas (Dutto et al, 2017). Also, a change in the local wind pattern has been perceived by local visitors and reported by media but it has not been studied until now (Figure 2) , and to compare within this period, the wind pattern during summers in which medusae were locally reported with those summers in which medusae were absent according to media reports and own data.…”

Section: Introductionmentioning

confidence: 99%

“…Given that in the last years, specimens of O. sambaquiensis were not found in plankton samples along the coastal area (Dutto et al, 2017;this study), an environmental regulation would be acting on the population dynamic of the species. If medusae were in the water column, the change in the wind pattern would probably prevent medusae reach the coast, but we do not have evidences that this change in wind magnitude is impacting on medusae reproduction or if it could impact it.…”

Section: Wind Pattern Change Along a Period Of Coastal Occurrence Varmentioning

confidence: 99%

Wind Pattern Change Along a Period of Coastal Occurrence Variation of a Stinging Medusa on a SW Atlantic Beach

et al. 2017

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Monte Hermoso (SW Atlantic, Argentina) is a coastal ecosystem highly modulated by wind forcing. Offshore winds have historically played a leading role in the tourist influx as they are associated with the occurrence of the endemic stinging medusa Olindias sambaquiensis. This species is closely related to warm summers but it could be favored by low temperatures in previous winters. Since summer 2013, a change in the wind pattern was locally perceived coincidently with the absence of the medusa in coastal waters. This work aimed at analyzing if wind pattern and sea surface temperature (SST) showed a measurable change along 2008-2015 and evaluating if this change can be associated to the observed variations in the occurrence pattern of O. sambaquiensis. Winds and SST data were analyzed in periods of high (2008-2012) and low (2013-2015) medusae occurrence, based on media and own observations. A significant change in the wind pattern in Monte Hermoso was detected. Wind speed decreased from 6.3 m s -1 in 2008 to 2.4 m s -1 in 2015 and calms and light winds increased by more than 44.2 and 7.5 %, respectively. This change implied an impediment of coastal upwelling, which is the physical process by which medusae reach the coast, and is associated with persistent (10 h or more) WNW to ENE winds blowing at ≥ 3.3 m s -1 . Accordingly, in summer 2008 (period of high medusae occurrence), 45 coastal upwelling-days were detected in contrast to only 8 days in summer 2015 (period of absence of medusae). Also, positive SST anomalies were found over the 8-yr period, suggesting an increasing trend of 0.4 °C. Higher temperatures than normal during recent winters probably affect negatively the polyp reproduction. Our results demonstrate an environmental change in the ecosystem of Monte Hermoso and may explain, in part, the low occurrence of O. sambaquiensis in recent summers. The knowledge of the factors that regulate the occurrence of O. sambaquiensis is fundamental for developing a coastal management plan and/or for determining the first adaptation strategies. Keywords: offshore winds; Sea Surface Temperature (SST) anomalies; coastal ecosystem; Olindias sambaquiensis; Southwestern Atlantic Ocean ResumoMonte Hermoso (SW Atlantic, Argentina) é um ecossistema costeiro altamente modulado pelo forçamento do vento. Os ventos marais têm historicamente desempenhado um papel de liderança no influxo turístico, uma vez que estão associados à ocorrência da medusa endêmica Olindias sambaquiensis. Esta espécie está intimamente relacionada aos verões quentes, mas pode ser favorecida por baixas temperaturas em invernos anteriores. Desde o verão de 2013, uma mudança no padrão de vento foi percebida localmente coincidentemente com a ausência da medusa nas águas costeiras. Este trabalho teve como objetivo analisar se o padrão de vento e a temperatura da superfície do mar (SST) mostraram uma alteração mensurável ao longo de 2008-2015 e avaliando se essa alteração pode ser associada às variações observadas no padrão de ocorrência de O. sambaqui...

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Medusae and ctenophores from the Bahía Blanca Estuary and neighboring inner shelf (Southwest Atlantic Ocean, Argentina)

Cited by 15 publications

References 31 publications

Macroscale abundance patterns of hydromedusae in the temperate Southwestern Atlantic (27°–56° S)

Macroscale abundance patterns of hydromedusae in the temperate Southwestern Atlantic (27°–56° S)

Size-fractionated chitin contribution to seston, with linkages to the copepod Acartia

Wind Pattern Change Along a Period of Coastal Occurrence Variation of a Stinging Medusa on a SW Atlantic Beach

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