Medusae (Scyphozoa and Cubozoa) from southwestern Atlantic and Subantarctic region (32 60S, 34 70W): species composition, spatial distribution and life history traits

Schiariti, Agustín; Dutto, M. Sofía; Pereyra, Daiana Yanel; Siquier, Gabriela Failla; Morandini, André C.

doi:10.3856/vol46-issue2-fulltext-1

Cited by 13 publications

(9 citation statements)

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“…One of the ocean regions most poorly studied in terms of jellyfish ecological data is the Southwestern Atlantic (SWA) [12,13]. There, the knowledge of species composition and distribution is characterized by a noticeable space-time discontinuity [14,15], and studies focused on jellyfish abundance in the area are practically nonexistent in spite of some efforts that have been made (see [16] for a review).…”

Section: Introductionmentioning

confidence: 99%

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: Introductionmentioning

confidence: 99%

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

et al. 2019

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“…Thus, its absence in our sampling would not indicate precisely that this species was not present in the region. According to Schiariti et al (2018), in the Argentine Sea, this species lives all over the Río de la Plata estuary at the Transitional Neritic Domain (TND), but specimens reach higher latitudes along the Buenos Aires Province coast up to Las Grutas (41° S -65° W). This species has been sporadically found deeper waters on the continental shelf up to the shelf break front but always within the TND, and is one of the most common and abundant species in the region.…”

Section: Discussionmentioning

confidence: 99%

“…This species has been sporadically found deeper waters on the continental shelf up to the shelf break front but always within the TND, and is one of the most common and abundant species in the region. Adult specimens have been observed mostly from December to May, with specimens found sporadically in August (late spring to mid-autumn) and accumulations observed between January and April (Schiariti et al 2018).…”

Section: Discussionmentioning

confidence: 99%

“…Several studies of GZ have been conducted during the last 25 years, which allows for a complete knowledge of the species richness in the temperate waters of the Southwestern Atlantic Ocean (SWAO) (e.g., Mianzan 1999;Genzano et al 2008a;Rodríguez et al 2017); however, none of these studies have described the succession of species during the different seasons. The analysis of these regional topics is of great importance because GZ have several ecological roles, such as a considerable effect on the plankton community through direct predation and competition for food (Alldredge 1984), and trophic cascading effects (Schneider and Behrends 1998), and diverse non-trophic interactions with other biological groups (e.g., see Schiariti et al 2018). However, due to the highly seasonal occurrence of many gelatinous species, their structuring effect is often temporary (Behrends and Schneider 1995).…”

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confidence: 99%

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Sucesión estacional de zooplancton gelatinoso (medusae y ctenophores) del puerto de Mar del Plata, Argentina (Océano Atlántico sudoccidental)

Tapia

Genzano

2019

Ecol. Austral

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Temporal variation of the population dynamics of the medusae and ctenophores (gelatinous zooplankton) is described over an annual cycle in the Mar del Plata Harbor, Argentina. A total of 18 species were identified, 3 of which were ctenophores (2 of Class Tentaculata and 1 of Nuda) and 15 medusae (14 of Class Hydrozoa and 1 of Scyphozoa). A species of hydromedusae, Annatiara affinis, was observed for the first time in the Argentine Sea. In both groups, species richness and abundances showed the lowest values in the cold period (austral autumn-winter) and the highest values in the warm period (spring-summer). The meroplanktonic medusae Obelia sp. and Eucheilota ventricularis as well as the holoplanktonic Liriope tetraphylla represented 94.2% of the total abundances of this group (classified as dominant). In the ctenophores, the dominant species were Pleurobrachia pileus and Mnemiopsis leidyi, which accounted for 99.3% of the ctenophores. Monthly medusae succession indicated that holoplanktonic species were dominant over practically all the annual cycle in terms of abundance, while considering species richness values, meroplanktonic species showed highest values. Ctenophores (considering abundance values) was displayed alternating periods of approximately three months of dominance between P. pileus and M. leidyi. The Bray-Curtis similarity index performed on medusae identified two groups of seasons with faunal affinity, the 1) cold and 2) warm periods, with the water temperature and non-gelatinous zooplankton abundances as the environmental factors that best explained this variability (BIO-ENV analysis), while for ctenophores, temporal faunal homogeneity was observed and a single group with faunal affinity was identified.

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“…Blooms of scyphozoan species have been reported in coastal areas worldwide (Purcell, Uye & Lo, 2007; Dong, Liu & Keesing, 2010; Purcell, 2012; Schiariti et al, 2018). These naturally-occurring phenomena have been increasing in frequency and magnitude in some areas, likely in response to various environmental disturbances including biological invasions (Graham & Bayha, 2008; Condon et al, 2012).…”

Section: Introductionmentioning

confidence: 99%

First record ofPhyllorhizasp. (Cnidaria: Scyphozoa) in a Chinese coastal aquaculture pond

Dong

Morandini

Schiariti

et al. 2019

PeerJ

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BackgroundIt has been suggested that aquaculture ponds on the Chinese coast could act as breeding grounds for scyphozoans. Here, we present the first record of the scyphomedusa Phyllorhiza sp. in an aquaculture pond on the coast of the southern Yellow Sea, based on a combination of morphological characteristics and mitochondrial 16S DNA sequence data.MethodsA field survey was performed on June 29, 2017 in a pond used for culturing the shrimp Penaeus japonicus, located in the southern Yellow Sea, China. Jellyfish specimens were collected for morphological and genetic analysis. The morphological characters of the jellyfish specimens were compared to taxonomic literature. Additionally, phylogenetic analysis of the mitochondrial 16S fragments of these specimens were also conducted.ResultsThese specimens had the following morphological characters: hemispherical umbrella without scapulets; J-shaped oral arms; a single larger terminal club on each arm; bluish colored with a slightly expanded white tip; and mouthlets present only in the lower half to one-third of each arm. These morphological features of the medusae indicated that the specimens found in the shrimp culture ponds belong to the genus Phyllorhiza Agassiz, 1862, but did not match with the description of any of the known species of the genus Phyllorhiza. Phylogenetic analyses of the mtDNA 16S regions revealed that these specimens, together with Phyllorhiza sp. from Malaysian coastal waters, belong to a sister group of Phyllorhiza punctata. Juveniles and ephyrae of Phyllorhiza sp. were observed in the aquaculture pond. The mean density of Phyllorhiza sp. medusa in the surface water within the pond was estimated to be 0.05 individuals/m2.DiscussionBased on our observations of the gross morphology and molecular data, we state that the specimens collected in the aquaculture pond can be identified as Phyllorhiza sp. This is the first record of Phyllorhiza sp. in Chinese seas. Large scale dispersal through ballast water or the expansion of jellyfish aquarium exhibitions are possible pathways of invasion, but this needs to be confirmed in further studies.

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Medusae (Scyphozoa and Cubozoa) from southwestern Atlantic and Subantarctic region (32 60S, 34 70W): species composition, spatial distribution and life history traits

Cited by 13 publications

References 45 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)

Sucesión estacional de zooplancton gelatinoso (medusae y ctenophores) del puerto de Mar del Plata, Argentina (Océano Atlántico sudoccidental)

First record ofPhyllorhizasp. (Cnidaria: Scyphozoa) in a Chinese coastal aquaculture pond

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