scholarly journals Role of Redox Processes in the Pedogenesis of Hypersaline Tidal Flat Soils on the Brazilian Coast

2018 ◽  
Vol 82 (5) ◽  
pp. 1217-1230 ◽  
Author(s):  
Lucas Resmini Sartor ◽  
Robert C. Graham ◽  
Samantha C. Ying ◽  
Xosé Luis Otero ◽  
Célia Regina Montes ◽  
...  
Keyword(s):  
Tidal Flat ◽  
Brazilian Coast ◽  
Redox Processes

Role of ion exchange in the redox processes of a polyaniline film studied by an ac quartz crystal microbalance

1990 ◽  
Vol 290 (1-2) ◽  
pp. 269-274 ◽  
Author(s):  
S. Cordoba-Torresi ◽  
C. Gabrielli ◽  
M. Keddam ◽  
H. Takenouti ◽  
R. Torresi
Keyword(s):  
Ion Exchange ◽  
Quartz Crystal Microbalance ◽  
Quartz Crystal ◽  
Redox Processes ◽  
Polyaniline Film

scholarly journals Intra-regional transportation of a tugboat fouling community between the ports of recife and natal, northeast Brazil

2010 ◽  
Vol 58 (spe3) ◽  
pp. 01-14 ◽  
Author(s):  
Cristiane Maria Rocha Farrapeira ◽  
Gledson Fabiano de Araujo Ferreira ◽  
Deusinete de Oliveira Tenório
Keyword(s):  
Rio Grande ◽  
Nonindigenous Species ◽  
Brazilian Coast ◽  
Northeast Brazil ◽  
Fouling Community

This study aimed to identify the incrusting and sedentary animals associated with the hull of a tugboat active in the ports of Pernambuco and later loaned to the port of Natal, Rio Grande do Norte. Thus, areas with dense biofouling were scraped and the species then classified in terms of their bioinvasive status for the Brazilian coast. Six were native to Brazil, two were cryptogenic and 16 nonindigenous; nine of the latter were classified as established (Musculus lateralis, Sphenia fragilis, Balanus trigonus, Biflustra savartii, Botrylloides nigrum, Didemnum psammatodes, Herdmania pallida, Microscosmus exasperatus, and Symplegma rubra) and three as invasive (Mytilopsis leucophaeta, Amphibalanus reticulatus, and Striatobalanus amaryllis). The presence of M. leucophaeata, Amphibalanus eburneus and A. reticulatus on the boat's hull propitiated their introduction onto the Natal coast. The occurrence of a great number of tunicate species in Natal reflected the port area's benthic diversity and facilitated the inclusion of two bivalves - Musculus lateralis and Sphenia fragilis - found in their siphons and in the interstices between colonies or individuals, respectively. The results show the role of biofouling on boat hulls in the introduction of nonindigenous species and that the port of Recife acts as a source of some species.

scholarly journals Optimal fishing samplers to reveal the morphological structure of a fish assemblage in a subtropical tidal flat

2019 ◽  
Vol 17 (1) ◽  
Author(s):  
Carolina C. Siliprandi ◽  
Víctor M. Tuset ◽  
Antoni Lombarte ◽  
Marc Farré ◽  
Carmen L. D. B. Rossi-Wongtschowski
Keyword(s):  
Tidal Flat ◽  
Fish Assemblage ◽  
Fish Assemblages ◽  
Morphological Variability ◽  
Morphological Structure ◽  
Morphological Diversity ◽  
Morphological Characters ◽  
Otter Trawl ◽  
Brazilian Coast ◽  
Geometric Morphometric

ABSTRACT Morphological characters of species are essential for assessing the functional structure of a fish assemblage, since differences between them, for example in body shape, are related to many functional and ecological traits (e.g., swimming, search for food, striking and capturing prey, evading predators, spawning). Globally, tidal flats are relevant to fish assemblages by offering feeding, refuge, and reproduction grounds. To analyze the morphofunctional structure of the fish assemblage from a tidal flat on the Brazilian coast, we conducted standardized sampling using nine different fishing gears. The geometric morphometric method was applied to describe the fish shapes and verify the morphological structure of the assemblage. Here, we present the influence/susceptibility of each gear type on the morphological diversity of the fish assemblage. The results indicated that beach seine, otter trawl, marginal encircling gillnet, and fish traps, together, were the most effective gears to represent the maximum morphological variability of fish inhabiting that tidal flat. Moreover, the assemblage showed high morphological redundancy considered as a resistance of the ecosystem for avoiding functional diversity loss, emphasizing the importance of complementary gear use when determining fish assemblages in a conservation context.

Soil genesis on hypersaline tidal flats (apicum ecosystem) in a tropical semi-arid estuary (Ceará, Brazil)

Soil Research ◽  
2014 ◽  
Vol 52 (2) ◽  
pp. 140 ◽  
Author(s):  
A. G. B. M. Albuquerque ◽  
T. O. Ferreira ◽  
G. N. Nóbrega ◽  
R. E. Romero ◽  
V. S. Souza Júnior ◽  
...  
Keyword(s):  
Tidal Flat ◽  
Coastal Wetland ◽  
Anthropogenic Activities ◽  
Analytical Data ◽  
Clay Fraction ◽  
Tidal Flats ◽  
Brazilian Coast ◽  
The North ◽  
North Eastern ◽  
Semi Arid

Wetland soils, especially those under a semi-arid climate, are among the least studied soils in the tropics. The hypersaline tidal flats on the north-eastern Brazilian coast, locally named apicum, are coastal wetland ecosystems in the peripheral portions of semi-arid estuaries. Despite their great ecological importance, they have been highly impacted by anthropogenic activities. Morphological and analytical data of six soil profiles, representative of the different coastal compartments (mangroves, apicum and coastal tablelands) of the north-eastern Brazilian coast, were examined to better understand the pedogenesis of apicum soils. The hypersaline tidal flat soils were classified as Typic Fluvaquents and Typic Sulfaquents with the following main characteristics: predominance of sand fraction (62–77%); presence of high-activity clays (>24 cmolc kg–1 clay); clay fraction comprising kaolinite, illite, smectite and an interstratified smectite/illite; exchangeable complex dominated by Na+ (ESP ≥15%); elevated levels of salinity (electrical conductivity, EC 25–44 dS m–1); alkaline pH values (7.5–9.5). The sandy texture and quartz-dominated composition of the hypersaline, tidal flat soils indicate a pedogenesis associated with the superficial addition of mineral material. This upbuilding process would have lowered the watertable (relatively to the ground level) and decreased the flooding frequency by the tides, favouring salinisation and solonisation processes at the hypersaline tidal flats. Furthermore, the still-existing hydromorphism would have promoted the maintenance of gleisation and sulfidisation. The presence of pyrite on the hyper-saline tidal flat soils further corroborates the formation of apicum soils from/over buried mangroves.

scholarly journals The role of coordination in catalytic redox processes

1971 ◽  
Vol 27 (1-2) ◽  
pp. 251-264 ◽  
Author(s):  
K. B. Yatsi-Mirskii
Keyword(s):  
Redox Processes

scholarly journals Spatio-temporal variation of the pink shrimp Farfantepenaeus paulensis (Crustacea, Decapoda, Penaeidae) associated to the seasonal overture of the sandbar in a subtropical lagoon

2009 ◽  
Vol 99 (4) ◽  
pp. 390-396 ◽  
Author(s):  
Nicolle C Ferreira ◽  
Andrea S Freire
Keyword(s):  
Ecological Problem ◽  
Brazilian Coast ◽  
Spatial Gradient ◽  
Pink Shrimp ◽  
Public Agencies ◽  
Traditional Management ◽  
Artificial Opening ◽  
Farfantepenaeus Paulensis ◽  
Spatio Temporal

On the southern Brazilian coast, the penaeid pink shrimp Farfantepenaeus paulensis (Pérez-Farfante, 1967) is intensively captured by both artisanal and industrial fisheries. In the Ibiraquera Lagoon, artisanal fishing of juvenile stocks has declined sharply over the last 15 years. The traditional management methods used by fishermen are no longer sustainable due to conflicts with the demands of tourism and weak environmental and public agencies. The dynamics of the timing of the artificial opening and natural reformation of a sandbar across the mouth of the lagoon are regarded as a central socio-ecological problem. We evaluated the abundance and biomass variation of F. paulensis throughout the year and along a spatial gradient measured from the sandbar into the lagoon. We also explored the influence of opening the sandbar on the shrimp population. Samples were collected monthly from February 2004 to February 2005, using a 27 mm mesh cast net, in four different areas, with three sites being sampled per area. Small numbers of large shrimps were captured in the upper area, while greater biomass and abundance of small shrimps were observed near the sandbar, suggesting the role of the inner area as a refuge for growing. The highest records for biomass and abundance were recorded during warm months, regardless if the lagoon was open or closed by the sandbar. The Ibiraquera Lagoon could be more productive for fishermen if the sandbar opening was coincident to the period of natural post-larvae influx. Furthermore, coastal stocks could be improved by opening the sandbar again during summer in conjunction with fishing quotas.

Do macrophytes act as restaurants for fishes in tropical beaches? An approach using stomach content and prey availability analyses

2021 ◽  
Author(s):  
Jonas de Andrade Santos ◽  
Rafael Lima Oliveira ◽  
Ana Paula Penha Guedes ◽  
Alexandre Clistenes de Alcântara Santos ◽  
Leonardo Evangelista Moraes
Keyword(s):  
Stomach Content ◽  
Optimal Foraging ◽  
Prey Availability ◽  
Influence Factors ◽  
Optimal Foraging Theory ◽  
Sandy Beaches ◽  
Food Sources ◽  
Brazilian Coast ◽  
Trophic Guild

Tropical sandy beaches have low primary productivity, thus depend on external food sources. Generally, allochthonous macrophytes, form the basis of these food webs, and also may influence factors such as fish’s abundance, richness, species composition, and biomass. However, the role of macrophytes to the feeding ecology of fishes in tropical sandy beaches is uncertain. We aim to explain if this microhabitat acts as restaurants for fishes by performing stomach content and prey availability analyses using Ophioscion punctatissimus as a model because it has an association with detached macrophytes mainly on sandy beaches along the northeastern Brazilian coast. The most consumed prey was crustaceans, mainly amphipods, which were eaten in a specialist way, especially by the smaller fishes. The prey availability along with electivity index suggested that this species choose amphipods. Seasonal variations may indicate that the fishes did not locate their preferential prey as an effect of the availability, this can be also explained by factors such as palatability, and optimal foraging theory. Here, we redefined the O. punctatissimus trophic guild as zooplanktivorous, highlighting macrophytes as restaurants for fishes in tropical sandy beaches as they are the main source of food, adding another function to this microhabitat in this environment.

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