First record of Cirrholovenia polynema (Hydrozoa: Leptothecata) in the Western Atlantic Ocean

Tosetto, Everton Giachini; Neumann‐Leitão, Sigrid; Bertrand, Arnaud; Júnior, Miodeli Nogueira

doi:10.1590/2675-2824069.20-001egt

Cited by 5 publications

(6 citation statements)

References 9 publications

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“…McCrady, 1859, Cirrholovenia polynema Kramp, 1959 andPegantha laevis H.B. Bigelow, 1909 were observed in the same sampling program discussed herein, and already were published in other contexts (Tosetto et al 2018(Tosetto et al , 2019(Tosetto et al , 2020(Tosetto et al , 2021b. Taxonomic attention based on observed specimens will be directed to new records and taxa with unresolved taxonomic questions.…”

Section: The First Records Of Persa Incoloratamentioning

confidence: 70%

“…The studied specimens differ from C. reticulata by the absence of reticular papillae covering the exumbrella and number of marginal cirri and statocysts (Xu and Huang 2004), which completely fit with the description of C. tetranema (Kramp 1959b). Other species of the genus present in the current study is Cirrholovenia polynema Kramp, 1959, differing from C. tetranema by the larger number of tentacles (up to 12 in the area; Tosetto et al 2021b).…”

Section: Family Cirrholoveniidaementioning

confidence: 80%

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Epipelagic cnidarian fauna in the Western Equatorial Atlantic Ocean off the Amazon River Delta

et al. 2022

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We surveyed the epipelagic cnidarian fauna from the Western Equatorial Atlantic Ocean. A characteristic feature in this area is the freshwater discharge of the Amazon River, the largest continental inflow in the world's oceans. We analyzed 87 plankton and 90 neuston samples collected at the neritic and oceanic provinces of the Western Tropical Atlantic under the influence of the Amazon River Plume off the north coast of Brazil. We studied 34,772 organisms corresponding to 7 orders, 31 families, and 93 species. Among them, Forskalia tholoides was a new record to the coast off South America, and 20 taxa were new regional records. Species accumulation curves and diversity estimators did not reach an asymptote and clearly suggested the occurrence of a considerably higher number of species. Sampling in different seasons, with different gears, and including deeper waters certainly will further increase the number of known pelagic cnidarian species in the area. Open ocean had higher diversity than the continental shelf, both for holoplanktonic and some meroplanktonic taxa. This trend can be related to complex circulation and topography. In conclusion, we observed high diversity in the epipelagic cnidarian community. The heterogeneity of habitats in the area is likely the main factor responsible for the high biodiversity, with samples from estuarine, coastal, neritic (with a large reef system), and oceanic waters. The wide salinity range caused by the Amazon River Plume and other oceanographic mesoscale processes such as eddies and opposite currents add further complexity to the environment.

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Section: The First Records Of Persa Incoloratamentioning

confidence: 70%

Section: Family Cirrholoveniidaementioning

confidence: 80%

Epipelagic cnidarian fauna in the Western Equatorial Atlantic Ocean off the Amazon River Delta

et al. 2022

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“…River discharge into the ocean decreases salinity and increases water turbidity and sedimentation, forming a plume that may act as a barrier to dispersion and settlement of marine invertebrates, including corals (Conaco and Cabaitan, 2020;Tosetto et al, 2022). Despite having relatively high turbidity levels (KD), the Northeastern and Eastern regions R4 and R6 (5°S-10°S and 12°S-20°S) presented the greater species richness and functional diversity, suggesting these are sediment-tolerant coral assemblages (Loiola et al, 2019).…”

Section: R7mentioning

confidence: 99%

“…The distribution of corals is largely influenced by species' traits, biotic interactions and abiotic conditions (Gleason and Hofmann, 2011). Coral larvae disperse through ocean currents occasionally confronting environmental filters such as distance (van der Ven et al, 2022), semi-permeable river plumes (Tosetto et al, 2022) or ocean currents themselves (Treml et al, 2008;Thompson et al, 2018;van der Ven et al, 2022). Reproductive traits, such as the reproductive mode (broadcaster or brooder) and pelagic larval duration (PLD), can determine how far a coral larvae can disperse, with broadcasting corals usually having a greater PLD and, therefore, higher dispersal potential than brooder corals (Ritson-Williams et al, 2009;Nunes et al, 2011).…”

Section: Introductionmentioning

confidence: 99%

“…Reproductive traits, such as the reproductive mode (broadcaster or brooder) and pelagic larval duration (PLD), can determine how far a coral larvae can disperse, with broadcasting corals usually having a greater PLD and, therefore, higher dispersal potential than brooder corals (Ritson-Williams et al, 2009;Nunes et al, 2011). When coral larvae reach ocean currents, they are subject to environmental filters, such as distance (van der Ven et al, 2022) and semipermeable river plumes (Tosetto et al, 2022). Finally, there are small-scale environmental filters, including the availability of suitable habitat for coral recruitment.…”

Section: Introductionmentioning

confidence: 99%

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Taxonomic and functional diversity of zooxanthellate corals and hydrocorals in Southwestern Atlantic reefs

Bleuel,

Waechter,

Bender

et al. 2024

Front. Ecol. Evol.

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The Southwestern Atlantic (SWA) harbors a relatively species poor but highly endemic coral assemblage due to historical processes, environmental and ecological drivers. Despite its low to moderate cover, corals still have a disproportionate contribution to ecosystem function and stability in this region. In the context of global change, it is imperative to know corals’ diversity and biogeographic patterns, yet a comprehensive approach is still missing for SWA corals. We integrated occurrence data from 21 sites and nine functional traits across 20 coral (scleractinian and hydrozoan) species to explore the taxonomic and functional diversity of coral assemblages in the SWA (1°N-27°S). We identified eight regions based on coral species composition, and then described their functional diversity using four metrics: functional richness (FRic), functional dispersion (FDis), functional evenness (FEve), and functional originality (FOri). Taxonomic and functional diversity peak between latitudes 13°S-20°S, decreasing with increasing distance from this diversity center, known as the Abrolhos Bank that harbors a wide continental platform. Our findings reveal a prevalent pattern of high functional redundancy across these eight regions (indicated by low functional originality), with species occupying the edges of the trait space (high functional evenness) and converging around few trait values (low functional dispersion). Such patterns resulted in low taxonomic and functional beta diversity and increased nestedness among regions caused by dispersal barriers and environmental filtering. The Southernmost region (24°-27°S) has the lowest taxonomic and functional diversity and comprises only two species that share similar traits, with these corals being: hermaphrodites, brooders and depth-tolerant, and having a wide corallite. As this region might become critical for corals in a future tropicalization scenario, tropical corals that share similar traits to those of the southernmost region can be more likely to thrive. Knowledge on taxonomic and functional diversity patterns can offer critical information to conservation by helping prioritizing areas with higher diversity and species with traits that enhance survival under climate change.

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The Amazon River plume, a barrier to animal dispersal in the Western Tropical Atlantic

Tosetto

Bertrand

Neumann‐Leitão

et al. 2022

Sci Rep

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The dispersal of marine organisms can be restricted by a set of isolation mechanisms including hard barriers or hydrological features. In the Western Atlantic Ocean, the Amazon River discharge has been shown to act as a biogeographical barrier responsible for the differences in reef fish communities between Caribbean Sea and Northeast Brazil continental shelves. Here, we compare the diversity of all Animalia phyla from biogeographic ecoregions along the Tropical Western Atlantic continental shelf to test the hypothesis that the Amazon River plume spatially structures species diversity. For that, we used beta diversity estimators and multivariate ecological analysis on a database of species occurrence of the whole animal kingdom including 175,477 occurrences of 8,375 species from six ecoregions along the Western Tropical Atlantic. Results of the whole animal kingdom and the richest phyla showed that the Caribbean Sea and Tropical Brazil ecoregions are isolated by the Amazon River Plume, broadening and confirming the hypothesis that it acts as a soft barrier to animal dispersal in the Western Tropical Atlantic. Species sharing is larger northwestwards, in direction of the Caribbean than the opposite direction. Beyond species isolation due to local characteristics such as low salinity and high turbidity, our results suggest the dominant northwestward currents probably play a major role in animal dispersion: it enhances the flux of larvae and other planktonic organisms with reduced mobility from Brazil to Caribbean and hinders their contrary movement. Thus, the Amazon area is a strong barrier for taxa with reduced dispersal capacity, while species of pelagic taxa with active swimming may transpose it more easily.

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First record of Cirrholovenia polynema (Hydrozoa: Leptothecata) in the Western Atlantic Ocean

Cited by 5 publications

References 9 publications

Epipelagic cnidarian fauna in the Western Equatorial Atlantic Ocean off the Amazon River Delta

Epipelagic cnidarian fauna in the Western Equatorial Atlantic Ocean off the Amazon River Delta

Taxonomic and functional diversity of zooxanthellate corals and hydrocorals in Southwestern Atlantic reefs

The Amazon River plume, a barrier to animal dispersal in the Western Tropical Atlantic

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