scholarly journals The effect of low salinity on teredinids

2000 ◽  
Vol 43 (4) ◽  
pp. 399-407 ◽  
Author(s):  
Cristine C. Barreto ◽  
Andrea O. R. Junqueira ◽  
Sérgio Henrique G. da Silva
Keyword(s):  
Rio De Janeiro ◽  
Common Species ◽  
Coastal Areas ◽  
Tropical Storms ◽  
Low Salinity ◽  
Critical Salinity

Teredinids survival in low salinities was determined in aquaria. Panels previously immersed in Ponta de Leste, Ilha Grande Bay, Rio de Janeiro, were transferred to aquaria with salinities ranging from 5.0 to 15.0 Practical Salinity Unities (PSU). The waters of Ilha Grande Bay receive a large amount of wood from the marginal rainforest vegetation, being suitable for the development of teredinids. The coastal areas of the bay are subjected to wide salinity fluctuations due to strong and sudden tropical storms. Eleven different species of teredinids were found in the panels. The critical salinity concentration for the survival of the two most common species was 11.93 PSU for Lyrodus floridanus and 12.90 PSU for Teredo furcifera. The effect of time on the mortality of teredinids at low salinities is also discussed.

Topics of Environmental Education Program in Coastal Areas

1992 ◽  
Vol 25 (9) ◽  
pp. 253-259 ◽  
Author(s):  
A. M. O. Rennhack ◽  
D. M. W. Zee ◽  
E. S. Cunha ◽  
M. F. Portilho
Keyword(s):  
Environmental Education ◽  
Rio De Janeiro ◽  
Local Community ◽  
Environmental Problems ◽  
Coastal Areas ◽  
State University ◽  
Urban Centers ◽  
Educational Support ◽  
Wide Range ◽  
Supply Information

Researches and Studies made by the Department of Oceanography of the Institute of Geoscience of the State University of Rio de Janeiro UERJ, evidenced the need for educational support where environment-related questions were concerned. A wide range of environment problems tend to concentrate in coastal areas, owing to disordinate urban growth combined with the lack of substructure to cope with it A large number of these problems can be minimized through the participation of the local community. Thus the goals of environmental education are to supply information, to promote a change in the population's attitude toward environmental problems, besides stimulating its participation by fostering its sense of responsibility. Preliminary results have demonstrated that the community has shown great interest in the work that has been proposed, and it has contributed with participation, promising response. Environmental education is fundamental when we consider possible solutions for environmental problems in coastal urban centers. Only by educating the main cause of environmental problems, man himself, will it be possible to consider the question starting from its very origin. This abstract presents two pioneer experiments in the Municipio of Rio de Janeiro, which are “Muito Prazer Marapendi” (“Glad to know you, Marapendi”) and “Troca de Areias da Praia de Copacabana” (“Exchange of Sands in Copacabana Beach”).

scholarly journals Mangroves and coastal topography create economic “safe havens” from tropical storms

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Jacob P. Hochard ◽  
Edward B. Barbier ◽  
Stuart E. Hamilton
Keyword(s):  
Economic Activity ◽  
High Elevation ◽  
Coastal Areas ◽  
Tropical Storms ◽  
Middle Income ◽  
Middle Income Countries ◽  
Indirect Exposure ◽  
Coastal Topography

AbstractEvidence suggests that mangroves protect economic activity in coastal areas. We estimate this protection from mangroves and coastal elevation globally, examining both “direct” and “indirect” exposure events (< 100 km vs. ≥ 100 km distance from a cyclone’s “eye”, respectively). We find that higher elevation (≥ 50 m) or wide mangroves (≥ 10 m seaward width) alone shelter economic activity from indirect cyclone exposure, whereas protection from direct cyclone exposure occurs only in high elevation communities with wide mangroves. Our results reveal that the majority of these “safe havens” are in upper middle-income countries but provide significant benefits to populations in lower middle-income countries.

scholarly journals Bionomy of Mosquitoes in Bamboo Internodes in an Atlantic Forest Remnant of the State of Rio De Janeiro, Brazil

2021 ◽  
Vol 37 (4) ◽  
pp. 208-215
Author(s):  
Amanda Queiroz Bastos ◽  
Paulo José Leite ◽  
Cecilia Ferreira de Mello ◽  
Daniele Aguiar Maia ◽  
Sergio Lisboa Machado ◽  
...  
Keyword(s):  
Atlantic Forest ◽  
Rio De Janeiro ◽  
Adult Stage ◽  
Mosquito Species ◽  
Common Species ◽  
Complex Environments ◽  
Ecological Studies ◽  
Immature Development ◽  
Forest Remnant ◽  
Mosquito Oviposition

ABSTRACT Living bamboo stalks are one of the most specialized habitats for mosquito oviposition and immature development. Most of the mosquito species that breed in these habitats are sylvatic, and some are of importance for public health as possible vectors of pathogens. Perforated internodes are a very specialized environment due to the difficulty of access. Furthermore, due to their relatively simple fauna, they represent a valuable model for ecological studies that may be applicable to more complex environments. This study aims to assess the mosquito bionomics of species raised in bamboo internodes. Therefore, the diversity of mosquito species and the influence of abiotic variables (pH and temperature) on the distribution of mosquitoes that breed in this habitat were analyzed. The study area is a fragment of Atlantic Forest within the Association of da Armada (ATA) in Nova Iguaçu, state of Rio de Janeiro, Brazil. Immature mosquitoes were sampled with suction tubes (mouth aspirators) between August 2017 and July 2018. A total of 3,170 larvae were collected in 5 bamboo plants, each with 8 stalks perforated. Of these, 688 larvae reached the adult stage, representing 10 genera and 19 species. The most common species were Culex neglectus (43%), Trichoprosopon digitatum (22%), Culex iridescens (8%), Sabethes identicus (7%), and Orthopodomyia albicosta (7%). The richness of the immatures collected in the ATA was 19 species, with a diversity of 1.10 and Shannon evenness of 0.57. A diverse composition of Culicidae in bamboo stalks was found, although dominance was low.

scholarly journals The relation of Gammarus zaddachi Sexton to some other species of Gammarus occurring in fresh, estuarine and marine waters

1942 ◽  
Vol 25 (3) ◽  
pp. 575-606 ◽  
Author(s):  
E. W. Sexton
Keyword(s):  
Distinct Species ◽  
Common Species ◽  
The Arctic ◽  
Northern Europe ◽  
Low Salinity ◽  
Gammarus Zaddachi ◽  
Estuarine Zone ◽  
History Of ◽  
The Difference ◽  
The Baltic

Gammarus zaddachi is perhaps the most prolific and widespread of all the estuarine amphipods known to occur in northern Europe, and inhabiting, as it does, the low-salinity estuarine zone and adjacent coasts, it has come to be recognized in recent ecological work as a ‘salinity indicator’.Unfortunately, there has been constant confusion with the other common species of Gammarus, G. locusta, pulex, and duebeni, which has been greatly complicated by the difference in the appearance of zaddachi according as it lives in a freshwater or a saline habitat. It is shown that this difference is entirely due to the sensory equipment, the greater production of hairs in freshwater conditions, and that the structure of the two ‘forms’ is identical.The history of the species has been carried back as far as I have been able to trace it (1836) with the actual specimens, described in the different papers, and the more important of these papers are discussed. It will be seen that the material examined was derived from every country of northern Europe; from Russia, the White Sea, Crimea, and the Baltic, the coasts of Scandinavia, Germany, including the Hamburg water-supply, Denmark, the Netherlands, Great Britain and Ireland, and France as far up the Loire as Nantes.Detailed descriptions and figures of both forms of G. zaddachi are given; and finally, a comparison is made between the species most commonly confused with it, the Arctic species G. wilkitzkii being included because of a suggestion recently made that it might be, not a distinct species, but merely the Arctic form of zaddachi.

A framework to support the urbanization process on lowland coastal areas: Exploring the case of Vargem Grande – Rio de Janeiro, Brazil

2019 ◽  
Vol 231 ◽  
pp. 1281-1293 ◽  
Author(s):  
Marcelo Gomes Miguez ◽  
Aline Pires Veról ◽  
Bruna Peres Battemarco ◽  
Lilian Marie Tenório Yamamoto ◽  
Fernanda Almeida de Brito ◽  
...  
Keyword(s):  
Rio De Janeiro ◽  
Coastal Areas ◽  
Urbanization Process

scholarly journals Análise de Polens para a Interpretação Paleoambiental de Sedimentos com 3520 anos A.P. na Baía de Guanabara, Rio de Janeiro, Brasil

2011 ◽  
Vol 34 (2) ◽  
pp. 9-13
Author(s):  
Ortrud Monika Barth ◽  
Cintia Ferreira Barreto ◽  
Claudia Gutterres Vilela ◽  
José Antônio Baptista-Neto
Keyword(s):  
Sea Level ◽  
Plant Development ◽  
Rio De Janeiro ◽  
Coastal Areas ◽  
The State ◽  
Guanabara Bay ◽  
Palynological Analysis ◽  
Different Types ◽  
Ombrophilous Forest ◽  
Similar Dynamic

The intention of the present investigation was to understand the dynamic of different types of vegetation that occurred in the Guanabara Bay region, Rio de Janeiro, during the recent Holocene, analyzing a sediment level of conventional 3520 À 50 years B.P. old, obtained in the Jurujuba sound. Palynological analysis of the sediment showed dominance of the Ombrophilous Forest, and plant taxa of the field vegetation were not frequent. Environment conditions were favorable to hygrophyte plant development. Similar dynamic of this transgressive sea level event was detected also in other coastal areas of the state of Rio de Janeiro, far from the Guanabara Bay.

scholarly journals Co-Occurrence of Marine Extremes Induced by Tropical Storms and an Ocean Eddy in Summer 2016: Anomalous Hydrographic Conditions in the Pacific Shelf Waters off Southeast Hokkaido, Japan

Atmosphere ◽  
2021 ◽  
Vol 12 (7) ◽  
pp. 888
Author(s):  
Hiroshi Kuroda ◽  
Yukiko Taniuchi ◽  
Hiromi Kasai ◽  
Takuya Nakanowatari ◽  
Takashi Setou
Keyword(s):  
Heavy Rainfall ◽  
Mesoscale Eddy ◽  
Ocean Model ◽  
Tropical Storms ◽  
Soya Warm Current ◽  
Kuroshio Water ◽  
Low Salinity ◽  
The Pacific ◽  
Current Water ◽  
Soya Warm Current Water

This study proposes an analysis methodology to address how very rare marine extremes can be understood using limited data. In summer 2016, extreme weather and marine events occurred simultaneously around the Pacific shelf off southeastern Hokkaido, Japan. Six successive tropical storms brought extreme precipitation and an anticyclonic mesoscale eddy of subtropical Kuroshio water closely approached the coast, locally causing marine heat waves. We examined how these compound extremes affected oceanographic conditions on the coastal shelf by analyzing data from ship surveys in October 2016 on the Pacific shelf and outputs from a realistic ocean model. Climatologically, warm, high-salinity (33.0–33.7) subtropical water from the Okhotsk Sea (modified Soya Warm Current water) is distributed near the sea surface on the Pacific shelf in October and transported by the along-shelf boundary current. In 2016, however, a vertically well-mixed low-salinity (<33.0) layer associated with the heavy rainfall was observed at 0–50 m depth on the shelf, salinity maxima (≥33.7) associated with Kuroshio water from the mesoscale eddy occurred at 50–150 m depth on the slope, and baroclinic jets formed along the salinity front near the shelfbreak. These observed salinity structures were reproduced by a 1/50° ocean model. Particle-tracking experiments revealed that the low-salinity water originated mainly off eastern Hokkaido, where heavy rainfall events occurred in August, and was modified by mixing with Soya Warm Current water before transport to the Pacific shelf.

The Diversity and Distribution of Mosses in Gujarat: Current Status

2016 ◽  
Vol 1 (2) ◽  
Author(s):  
D. G. Shah ◽  
R. V. Gujar ◽  
A. P. Singh
Keyword(s):  
Deciduous Forest ◽  
Common Species ◽  
Coastal Areas ◽  
The State ◽  
The Other ◽  
Current Status ◽  
Intensive Study ◽  
Almost All ◽  
First Time

Gujarat harbors a large diversity of habitats ranging from deserts to moist deciduous forest to grasslands and coastal areas which provide a variety of microhabitats necessary for colonisation by bryophytes. An earlier study reported 44 species of mosses in Gujarat. 75% of the districts however remained unsurveyed. Hence, to understand the diversity of bryophytes in the state and its distribution, an intensive study was carried from November 2013 to February 2015. The present study reports the presence of 24 species of mosses which belong to 12 genera falling under 7 families. Pottiaceae, Bryaceae, Plagiothiaceae and Fissidentaceae are the dominant moss families of Gujarat while Bryum, Stereophyllum and Hyophila are the dominant moss genera with four species each. Gymnostomiella. vernicosa (Hook.) Fleish. and Hyophila. involuta (Hook.) Jaeg. were the most common and found in almost all the districts of Gujarat. The other common species included Hydrogonium consanguineum (Thw. et Mitt.), Barbula indica (Hook.) Spreng., Bryum coronatum Schwaegr, Bryum capillare L. ex Hedw. Brachyemenium turgidium Broth. ex Dix., Fissidens curvatoinvolutus Dixon. and Barbula indica (Hook.) Spreng . Physcomitrium eurystomum Sendth. and Hyophila spathulata (Harv.) Jaeg. are being reported for the first time from the state. Moss records are being reported for the first time for more than 20 districts of the state. Dangs district has the highest diversity followed by Junagadh, Panchmahal and Valsad districts

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