scholarly journals Effects of the burrowing crab Chasmagnathus granulata (Dana) on meiofauna of estuarine intertidal habitats of Patos Lagoon, Southern Brazil

2005 ◽  
Vol 48 (2) ◽  
pp. 267-274 ◽  
Author(s):  
Leonardo Cruz Rosa ◽  
Carlos Emilio Bemvenuti
Keyword(s):  
Community Structure ◽  
Salt Marsh ◽  
Southern Brazil ◽  
Patos Lagoon ◽  
Chasmagnathus Granulata ◽  
Meiofauna Community ◽  
Intertidal Habitats ◽  
Crab Chasmagnathus Granulata ◽  
Burrowing Crab

This study aimed to evaluate the effects of the burrowing crab Chasmagnathus granulata on meiofauna at three intertidal habitats across a tidal exposure gradient (i.e., an emerged salt marsh, an emerged mudflat and a submerged mudflat) in an estuarine embayment of Patos Lagoon, Southern Brazil. Meiofauna community was dominated by nematodes and ostracods, following by copepods and turbellarians. Densities of all studied organisms varied significantly among habitats. Highest values were observed in submerged mudflat while lower in salt marsh. Nematodes were unaffected by crab in either habitat, whereas ostracod, copepod and turbellarian densities were significantly lower in disturbed than control areas in both mudflat habitats. Any meiofaunal group was affected in salt marsh, probably due to a less intense disturbance. The results showed that the burrowing crab C. granulata could play an important role on meiofauna community structure in estuarine intertidal habitats of Patos Lagoon, because crab disturbance seemed to affect mainly surface populations, especially in mudflat. However, the meiofauna response to crab disturbance was variable among habitats depending of the intensity and the frequency of the disturbance.

Nitzschia papillosa (Bacillariaceae, Bacillariophyta): a new species from a Brazilian salt marsh

Phytotaxa ◽  
2016 ◽  
Vol 247 (1) ◽  
pp. 75 ◽  
Author(s):  
Lucielle Merlym Bertolli ◽  
Dávia Marciana Talgatti ◽  
Lezilda Carvalho Torgan
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
New Species ◽  
Salt Marsh ◽  
First Record ◽  
Southern Brazil ◽  
Rio Grande Do Sul ◽  
Patos Lagoon ◽  
A New Species ◽  
Scanning Electron

A new species of the genus Nitzschia was found in epiphyton and microphytobenthos at the Patos Lagoon salt marsh (Rio Grande do Sul State, southern Brazil). Nitzschia papillosa sp. nov. was described under light and scanning electron microscopy and compared with other species from the section Lanceolatae. The species presents features shared by several species of the genus such as a linear-lanceolate outline, cuneate ends and irregularly distributed fibulae. The distinguishable feature is a row of dots on the margin opposite to the fibulae. In scanning electron microscopy, these structures appear as silica excrescences, little rounded or squared, which we refer as papillae, situated at the transapical costae in the internal valve face. This is the first record of this kind of ornamentation in Nitzschia species.

Antioxidant Defenses and DNA Damage Induced by UV-A and UV-B Radiation in the Crab Chasmagnathus granulata (Decapoda, Brachyura)¶

2005 ◽  
Vol 81 (2) ◽  
pp. 398 ◽  
Author(s):  
Glauce R. Gouveia ◽  
Daiane S. Marques ◽  
Bruno P. Cruz ◽  
Laura A. Geracitano ◽  
Luiz E. M. Nery ◽  
...  
Keyword(s):  
Dna Damage ◽  
Antioxidant Defenses ◽  
Chasmagnathus Granulata ◽  
Crab Chasmagnathus Granulata

scholarly journals Temporal Variability of Suspended-Solids Concentration in the Estuarine Channel of Patos Lagoon, Southern Brazil

Water ◽  
2021 ◽  
Vol 13 (5) ◽  
pp. 646
Author(s):  
Rafael André Ávila ◽  
Priscila Mulattieri Suarez Orozco ◽  
Mauro Michelena Andrade ◽  
Osmar Olinto Möller
Keyword(s):  
Temporal Variability ◽  
Suspended Solids ◽  
Southern Brazil ◽  
Patos Lagoon ◽  
Reliable Technique ◽  
Acoustic Data ◽  
Solids Concentration ◽  
Estuarine Hydrodynamics ◽  
Inflow Conditions

The assessment of suspended-solids dynamics is crucial for the effective monitoring of estuarine environments. As the recurring in-situ sampling is usually problematic, the calibration of the backscattering from acoustic Doppler profilers has shown to be a reliable technique to estimate the suspended-solids concentration (SSC) in estuaries and rivers. In this study, we obtained a linear model that provides SSC estimates for the estuarine channel of Patos Lagoon by calibrating turbidity and acoustic data with in-situ concentration samples. The model output was analyzed in terms of its relationship with estuarine hydrodynamics and temporal variability. In this estuary, the supply of suspended solids is known to be due the runoff from its main tributaries, but also through the exchanges between the estuary and the coastal ocean. Both sources provide sediments and organic solids which affect water quality, geomorphology, and harbor operations. Results show that SSC is strongly linked to estuarine hydrodynamics, where concentrations increase with streamflow. During outflow periods, higher concentrations are associated with river runoff, whereas with inflow conditions they are induced by southern and southwesterly winds. However, relationship between SSC and streamflow is asymmetrical, meaning that the largest concentrations are majorly linked to outflow currents and downstream transport.

scholarly journals Stress and subsidy effects of seagrass wrack duration, frequency, and magnitude on salt marsh community structure

Ecology ◽  
2017 ◽  
Vol 98 (7) ◽  
pp. 1884-1895 ◽  
Author(s):  
Torrance C. Hanley ◽  
David L. Kimbro ◽  
Anne Randall Hughes
Keyword(s):  
Community Structure ◽  
Salt Marsh ◽  
Marsh Community

Epibiosis on eggs and brooding care in the burrowing crab Chasmagnathus granulatus (Brachyura:Varunidae): comparison between mudflats and salt marshes

2007 ◽  
Vol 87 (4) ◽  
pp. 893-901 ◽  
Author(s):  
Paola V. Silva ◽  
Tomás A. Luppi ◽  
Eduardo D. Spivak
Keyword(s):  
Salt Marsh ◽  
Filamentous Fungi ◽  
Salt Marshes ◽  
Maternal Care ◽  
Spartina Densiflora ◽  
Incubation Chamber ◽  
Stage Of Development ◽  
Key Species ◽  
Burrowing Crab ◽  
Chasmagnathus Granulatus

Chasmagnathus granulatus is a semiterrestrial intertidal burrowing crab that inhabits both the unvegetated mudflats and the cordgrass (Spartina densiflora) salt marshes in Mar Chiquita Lagoon (Argentina), where it is considered the ecologically key species. The mass of C. granulatus eggs incubated by females is colonized by epibiotic micro-organisms and accumulates detritus. The type of epibionts that use eggs as a substrate, the infestation degree, the maternal care behaviour and the protection of the incubation chamber were compared between females living on mudflats and on Spartina-dominated areas. In both places, the epibiosis by bacteria and filamentous fungi and peritrichid colonial ciliate was significantly higher in the periphery than in the centre of the brood mass. The accumulation of detritus was higher in the periphery in mudflat females but not in salt marsh females. Moreover, the level of detritus was significantly higher in mudflat than in salt marsh females only in the periphery of the brood. The infestation level of bacteria and fungi, and peritrichids, increased throughout the embryonic development only in mudflat females. The periphery of the brood mass was significantly more contaminated in mudflat than in marsh females, while the central region of the brood mass did not differ between habitats. The pleopods were significantly more contaminated by bacteria and filamentous fungi and peritrichid colonial ciliates in premoult females than in postmoult females, independently from the collection site. The percentage of females with abnormal embryos was significantly higher in mudflats (26.7%) than in marshes (12.3%). Females with late embryos spent more time flapping the abdomen and probing the embryos with the chela. Non-ovigerous females did not perform specific maternal care activities. The volume of brood mass both in early or late stage of development is greater than that of the incubation chamber and, consequently, peripheral embryos are more exposed.

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