Environmental factors related to anuran assemblage composition, richness and distribution at four large rivers under varied impact levels in southeastern Brazil

2010 ◽  
Vol 27 (8) ◽  
pp. 1023-1036 ◽  
Author(s):  
A. M. De Souza ◽  
P. C. Eterovick
Keyword(s):  
Environmental Factors ◽  
Large Rivers ◽  
Southeastern Brazil ◽  
Assemblage Composition

Bioeroding sponge assemblages: the importance of substrate availability and sediment

2018 ◽  
Vol 99 (2) ◽  
pp. 343-358 ◽  
Author(s):  
Joseph Marlow ◽  
Christine H.L. Schönberg ◽  
Simon K. Davy ◽  
Abdul Haris ◽  
Jamaluddin Jompa ◽  
...  
Keyword(s):  
Coral Reef ◽  
Environmental Factors ◽  
Spatial Variation ◽  
Environmental Conditions ◽  
Sponge Species ◽  
Coral Mortality ◽  
Substrate Availability ◽  
Abiotic Conditions ◽  
Assemblage Composition ◽  
Reef Health

Despite global deterioration of coral reef health, not all reef-associated organisms are in decline. Bioeroding sponges are thought to be largely resistant to the factors that stress and kill corals, and are increasing in abundance on many reefs. However, there is a paucity of information on how environmental factors influence spatial variation in the distribution of these sponges, and how they might be affected by different stressors. We aimed to identify the factors that explained differences in bioeroding sponge abundance and assemblage composition, and to determine whether bioeroding sponges benefit from the same environmental conditions that can contribute towards coral mortality. Abundance surveys were conducted in the Wakatobi region of Indonesia on reefs characterized by different biotic and abiotic conditions. Bioeroding sponges occupied an average of 8.9% of available dead substrate and variation in abundance and assemblage composition was primarily attributed to differences in the availability of dead substrate. Our results imply that if dead substrate availability increases as a consequence of coral mortality, bioeroding sponge abundance is also likely to increase. However, bioeroding sponge abundance was lowest on a sedimented reef, despite abundant dead substrate. This suggests that not all forms of coral mortality will benefit all bioeroding sponge species, and sediment-degraded reefs are likely to be dominated by a few resilient bioeroding sponge species. Overall, we demonstrate the importance of understanding the drivers of bioeroding sponge abundance and assemblage composition in order to predict possible impacts of different stressors on reefs communities.

Local Environmental Factors Influence the Structure of Frog Communities on the Sandy Coastal Plains of Southeastern Brazil

Herpetologica ◽  
2017 ◽  
Vol 73 (4) ◽  
pp. 307-312 ◽  
Author(s):  
Jane C.F. de Oliveira ◽  
Gisele R. Winck ◽  
Juliane Pereira-Ribeiro ◽  
Carlos Frederico Duarte Rocha
Keyword(s):  
Environmental Factors ◽  
Southeastern Brazil ◽  
Coastal Plains

scholarly journals Structure of the leaf litter frog community in an area of Atlantic Forest in southeastern Brazil

2020 ◽  
Vol 37 ◽  
pp. 1-10
Author(s):  
Natália Vagmaker ◽  
Juliane Pereira-Ribeiro ◽  
Átilla Colombo Ferreguetti ◽  
Alex Boazi ◽  
Rayanne Gama-Matos ◽  
...  
Keyword(s):  
Environmental Factors ◽  
Leaf Litter ◽  
Effect Of Temperature ◽  
Southeastern Brazil ◽  
Primary Forest ◽  
Trophic Chain ◽  
Measured Temperature ◽  
Espírito Santo ◽  
Forest Leaf Litter ◽  
Espirito Santo

Different spatial and temporal factors can influence the species richness and abundance of leaf anurans that are fundamental for the ecosystem functioning, as they act as predators and integrate the trophic chain as prey of other animals. There are relatively few studies that aimed to understand the spatio-temporal variation and the influence of environmental factors on leaf litter communities. We studied parameters of the anuran community living in the forest leaf litter in the Duas Bocas Biological Reserve (DBBR), Espírito Santo, Brazil. We sought to understand the extent to which richness, abundance, biomass and density varied between two locations with different stages of preservation (primary and secondary forest). In addition, we tested the effect of temperature and local humidity on abundance. We conducted the samplings monthly from October 2017 to September 2018, establishing 98 4 x 4 m plots (16 m2 each) demarcated on the DBBR forest leaf litter. We measured temperature (°C) and relative air humidity (%), and each plot was carefully surveyed by four observers. We tested for differences in anuran density between the two sampled locations and estimated the effects of environmental variables in the community. We recorded 102 individuals of anurans from 11 species belonging to eight families. The DBBR anuran community parameters significantly differed between the two studied locations, with the highest values of anuran richness and abundance occurring in the area covered by primary forest, probably due to differences in the preservation of each area. However, temperature and humidity did not affect the abundance of anurans in the sampled areas. Our results provide the first information about spatial variation and influence of environmental factors, directed to the community of leaf litter anurans in DBBR, and represents the second study on this group of anurans in the state of Espírito Santo.

scholarly journals Influence of environmental factors on the bathymetric distribution of the flecked box crab Hepatus pudibundus (Herbst, 1785) (Crustacea: Aethroidea) in the Southeastern Brazilian coast

2019 ◽  
Vol 19 (1) ◽  
Author(s):  
Veronica Pereira Bernardes ◽  
Fernando Luis Mantelatto ◽  
Thiago Elias da Silva ◽  
Aline Nonato de Sousa ◽  
Camila Hipólito Bernardo ◽  
...  
Keyword(s):  
Environmental Factors ◽  
Food Availability ◽  
Organic Matter Content ◽  
Temporal Distribution ◽  
Predatory Behavior ◽  
Matter Content ◽  
Southeastern Brazil ◽  
Brazilian Coast ◽  
Northern Coast ◽  
Spatio Temporal

Abstract: This study evaluated the relationships between environmental factors and the spatio-temporal distribution of H. pudibundus, with the hypothesis of differential occupation in coastal areas of southeastern Brazil. The samplings took place monthly in January-December 2000 period, along nine transects from 2 to 40 m of depth, in Ubatuba region, northern coast of São Paulo. We collected 1808 individuals of H. pudibundus. The highest abundance was recorded in winter in the transects 10-25 m deep. Abundance was positively correlated with organic matter content and texture sediment (phi values). With the retreat of the South Atlantic Central Water (SACW) in autumn and winter, the sediment swirls, suspending the detritivore and filter-feeding macrofauna, increasing the food availability. Sites characterized by finer sediment offer higher food availability, besides facilitating H. pudibundus burying behavior. Due to its opportunistic predatory behavior, this species feeds on a variety of organisms, including mollusks, annelids and foraminifera, which are preys more abundant in the studied area and in sediments of finer grain size.

scholarly journals Spatial and temporal distribution of stream macroalgae in a tropical river basin

2015 ◽  
Vol 15 (4) ◽  
Author(s):  
Aurélio Fajar Tonetto ◽  
Cleto Kaveski Peres ◽  
Rafael Taminato Hirata ◽  
Ciro Cesar Zanini Branco
Keyword(s):  
Environmental Factors ◽  
Light Availability ◽  
Temporal Distribution ◽  
Southeastern Brazil ◽  
Spatial And Temporal Variation ◽  
Major Influence ◽  
Spatial And Temporal Distribution ◽  
Tropical River ◽  
Stream Macroalgae ◽  
One Year

Spatial and temporal distribution of stream macroalgae in streams from southeastern Brazil were assessed for one year. The fluctuations in macroalgal species composition and environmental factors were monitored monthly. The region exhibit a tropical climate, with defined rainy and dry seasons. Nineteen species were found, with a predominance of Chlorophyta (52.7% of the species), followed by Cyanobacteria (26.3%), Ochrophyta and Rhodophyta (10.5% each). Scytonema arcangeli had the highest number of records (63.6%), while Mougeotia capucina occurred in all sampling sites. Community structure had low similarity (20-26%) and the environmental factors showed a weak contribution to the distribution pattern observed. Despite this, the light availability at the stream-bed seems to be a major influence on the macroalgal seasonal dynamics. We suggest that macroalgae communities are predominantly composed of rare species, and this could explain the lack of a clear spatial and temporal variation pattern of these organisms.

scholarly journals High temperatures and absence of light affect the hatching of resting eggs of Daphnia in the tropics

2016 ◽  
Vol 88 (1) ◽  
pp. 179-186 ◽  
Author(s):  
Thécia A.S.V. Paes ◽  
Arnola C. Rietzler ◽  
Diego G.F. Pujoni ◽  
Paulina M. Maia-Barbosa
Keyword(s):  
Environmental Factors ◽  
High Temperatures ◽  
Aquatic Ecosystems ◽  
Resting Eggs ◽  
Negative Influence ◽  
Southeastern Brazil ◽  
Light Conditions ◽  
Tropical Environments ◽  
The Tropics ◽  
Hatching Rates

Temperature and light are acknowledged as important factors for hatching of resting eggs. The knowledge of how they affect hatching rates of this type of egg is important for the comprehension of the consequences of warming waters in recolonization of aquatic ecosystems dependent on dormant populations. This study aimed at comparing the influence of different temperature and light conditions on hatching rates of Daphnia ambigua andDaphnia laevis resting eggs from tropical environments. The ephippia were collected in the sediment of three aquatic ecosystems, in southeastern Brazil. For each lake, the resting eggs were exposed to temperatures of 20, 24, 28 and 32 °C, under light (12 h photoperiod) and dark conditions. The results showed that the absence of light and high temperatures have a negative influence on the hatching rates. Statistical differences for hatching rates were also found when comparing the studied ecosystems (ranging from 0.6 to 31%), indicating the importance of local environmental factors for diapause and maintenance of active populations.

Environmental Factors Affecting Calling Behavior of Sympatric Frog Species at an Atlantic Rain Forest Area, Southeastern Brazil

2012 ◽  
Vol 46 (1) ◽  
pp. 41-46 ◽  
Author(s):  
Monique Van Sluys ◽  
Rodrigo V. Marra ◽  
Leonardo Boquimpani-Freitas ◽  
Carlos Frederico D. Rocha
Keyword(s):  
Environmental Factors ◽  
Rain Forest ◽  
Forest Area ◽  
Calling Behavior ◽  
Southeastern Brazil ◽  
Atlantic Rain Forest ◽  
Factors Affecting ◽  
Frog Species

Tricorythodes tragoedia sp. nov. (Ephemeroptera: Leptohyphidae), a new species from Rio Doce and surrounding areas, southeastern Brazil

Zootaxa ◽  
2017 ◽  
Vol 4341 (4) ◽  
pp. 554 ◽  
Author(s):  
PAULA MALAQUIAS SOUTO ◽  
KAMILA BATISTA ANGELI ◽  
FREDERICO FALCÃO SALLES
Keyword(s):  
New Species ◽  
Maxillary Palp ◽  
Large Rivers ◽  
Southeastern Brazil ◽  
Apical Seta ◽  
Surrounding Areas ◽  
Doce River ◽  
A New Species

A new species of Tricorythodes Ulmer (Ephemeroptera: Leptohyphidae) is described and illustrated based on nymphs and adults from the Doce River and surrounding areas in southeastern Brazil. Tricorythodes tragoedia sp. nov. is related to T. arequita Traver, T. mirca Molineri and T. sallesi Dias, Cabette & De Sousa, but its nymphs can be distinguished from these species by having a three-segmented maxillary palp with apical seta and one pair of submarginal denticles on the tarsal claws. Nymphs were collected from small to large rivers at altitudes of less than 100 m where they inhabit submersed substrates in areas with slow current. Nymphs and adults were found throughout the year. 

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