scholarly journals Variable Fitness Response of Two Rotifer Species Exposed to Microplastics Particles: The Role of Food Quantity and Quality

Toxics ◽  
2021 ◽  
Vol 9 (11) ◽  
pp. 305
Author(s):  
Claudia Drago ◽  
Guntram Weithoff
Keyword(s):  
Population Growth ◽  
Environmental Problem ◽  
Food Concentration ◽  
Polymer Composition ◽  
Plastic Pollution ◽  
Rotifer Species ◽  
Food Quantity ◽  
Egg Ratio ◽  
Planktonic Rotifers

Plastic pollution is an increasing environmental problem, but a comprehensive understanding of its effect in the environment is still missing. The wide variety of size, shape, and polymer composition of plastics impedes an adequate risk assessment. We investigated the effect of differently sized polystyrene beads (1-, 3-, 6-µm; PS) and polyamide fragments (5–25 µm, PA) and non-plastics items such as silica beads (3-µm, SiO2) on the population growth, reproduction (egg ratio), and survival of two common aquatic micro invertebrates: the rotifer species Brachionus calyciflorus and Brachionus fernandoi. The MPs were combined with food quantity, limiting and saturating food concentration, and with food of different quality. We found variable fitness responses with a significant effect of 3-µm PS on the population growth rate in both rotifer species with respect to food quantity. An interaction between the food quality and the MPs treatments was found in the reproduction of B. calyciflorus. PA and SiO2 beads had no effect on fitness response. This study provides further evidence of the indirect effect of MPs in planktonic rotifers and the importance of testing different environmental conditions that could influence the effect of MPs.

Body Size, Food Concentration, and Population Growth in Planktonic Rotifers

Ecology ◽  
1985 ◽  
Vol 66 (4) ◽  
pp. 1151-1159 ◽  
Author(s):  
Richard S. Stemberger ◽  
John J. Gilbert
Keyword(s):  
Body Size ◽  
Population Growth ◽  
Food Concentration ◽  
Planktonic Rotifers

Population Growth and Body Size in Five Rotifer Species in Response to Variable Food Concentration

2007 ◽  
Vol 22 (1) ◽  
pp. 1-10 ◽  
Author(s):  
S. Nandini ◽  
S. S.S. Sarma ◽  
Rómulo Javier Amador-López ◽  
Sandra Bolaños-Muñioz
Keyword(s):  
Body Size ◽  
Population Growth ◽  
Food Concentration ◽  
Rotifer Species

PERAN MASYARAKAT TERHADAP PEMBAYARAN RETRIBUSI SAMPAH DI KOTA SAMARINDA

2018 ◽  
Vol 2 (1) ◽  
pp. 33
Author(s):  
Abd Rachim AF,
Keyword(s):  
Waste Management ◽  
Population Growth ◽  
Frequency Analysis ◽  
Urban Areas ◽  
Relative Frequency ◽  
Environmental Problems ◽  
Living Standards ◽  
The Public ◽  
And Behavior

One of the environmental problems in urban areas is the pollution caused by garbage. The waste problem is caused by various factors such as population growth, living standards changes, lifestyles and behavior, as well as how the waste management system. This study aims to determine how the role of society to levy payments garbage in Samarinda. This research was descriptive; where the data is collected then compiled, described and analyzed used relative frequency analysis. The participation of the public to pay a "levy junk", which stated to pay 96.67%, for each month and the rates stated society cheap, moderate and fairly, respectively 46.08%, 21.21%, 21.04%. Base on the data , the role of the community to pay "levy junk" quite high.

Plant Resistance in Some Modern Soybean Varieties May Favor Population Growth and Modify the Stylet Penetration of Bemisia tabaci (Hemiptera: Aleyrodidae)

2021 ◽  
Author(s):  
Mauricélia F Almeida ◽  
Clébson S Tavares ◽  
Euires O Araújo ◽  
Marcelo C Picanço ◽  
Eugênio E Oliveira ◽  
...  
Keyword(s):  
Population Growth ◽  
Bemisia Tabaci ◽  
Intrinsic Rate ◽  
Reproductive Rate ◽  
Genetically Engineered ◽  
Population Increase ◽  
Net Reproductive Rate ◽  
Bt Toxin ◽  
Demographic Performance

Abstract Complaints of severe damage by whiteflies in soybean fields containing genetically engineered (GE) varieties led us to investigate the role of transgenic soybean varieties expressing resistance to some insects (Cry1Ac Bt toxin) and to herbicide (glyphosate) on the population growth and feeding behavior of Bemisia tabaci (Gennadius) MEAM1 (Hemiptera: Aleyrodidae). In the laboratory, the whiteflies reared on the GE Bt soybeans had a net reproductive rate (R0) 100% higher and intrinsic rate of population increase (rm) 15% higher than those reared on non-GE soybeans. The increased demographic performance was associated with a higher lifetime fecundity. In electrical penetration graphs, the whiteflies reared on the GE soybeans had fewer probes and spent 50% less time before reaching the phloem phase from the beginning of the first successful probe, indicating a higher risk of transmission of whitefly-borne viruses. Data from Neotropical fields showed a higher population density of B. tabaci on two soybean varieties expressing glyphosate resistance and Cry1Ac Bt toxin. These results indicate that some GE soybean varieties expressing insect and herbicide resistances can be more susceptible to whiteflies than non-GE ones or those only expressing herbicide resistance. Most likely, these differences are related to varietal features that increase host-plant susceptibility to whiteflies. Appropriate pest management may be needed to deal with whiteflies in soybean fields, especially in warm regions, and breeders may want to consider the issue when developing new soybean varieties.

scholarly journals Towards understanding the effects of oceanic plastic pollution on population growth for a South American fur seal (Arctocephalus australis australis) colony in Chile

2021 ◽  
Vol 279 ◽  
pp. 116881
Author(s):  
Diego Joaquín Perez-Venegas ◽  
Andrés Valenzuela-Sánchez ◽  
Felipe Montalva ◽  
Héctor Pavés ◽  
Mauricio Seguel ◽  
...  
Keyword(s):  
Population Growth ◽  
South American ◽  
Plastic Pollution ◽  
Fur Seal

Rotifer dynamics in three shallow lakes from the Salado river watershed (Argentina): the potential modulating role of incident solar radiation

2015 ◽  
Vol 14 (11) ◽  
pp. 2007-2013 ◽  
Author(s):  
Nadia Diovisalvi ◽  
Armando M. Rennella ◽  
Horacio E. Zagarese
Keyword(s):  
Solar Radiation ◽  
Shallow Lakes ◽  
Seasonal Cycle ◽  
Schematic Representation ◽  
Incident Solar Radiation ◽  
River Watershed ◽  
Clear Sky ◽  
Rotifer Species ◽  
Salado River

A schematic representation of the seasonal cycle of rotifer in L. Chascomús. In this figure the relative abundances of the three dominant rotifer species are expressed as fractions of the estimated clear-sky mean daily incident solar radiation.

scholarly journals Prediction of environmental activism: The role of knowledge, attitudes, affects and behaviors

2020 ◽  
pp. 127-144
Author(s):  
Milica Marušić-Jablanović ◽  
Jelena Stanišić
Keyword(s):  
Environmental Problem ◽  
Reciprocal Relationship ◽  
Environmental Activism ◽  
Virtual Space ◽  
Environmental Knowledge ◽  
Environmental Behaviors ◽  
Affective Attitude ◽  
The Right ◽  
And Behavior

The components of ecological li teracy comprise knowledge, attitudes, affect, behavior, and environmental activism. The goal of this paper is to establish whether environmental activism can be predicted on the basis of environmental knowledge, proenvironmental attitudes, affect, and behavior. In addition to this, the goal of the research is to examine to what extent individuals of different activism levels differ in terms of knowledge of basic environmental problems, expression of the attitude of ecological apathy, anthropocentrism, belonging to nature and connection with nature, as well as usual practices of pro-environmental behavior. By surveying a sample of adult respondents from Serbia who belong to a group devoted to an environmental problem (N=255), we have discovered that general environmental knowledge alone does not contribute to pro-environmental behaviors or environmental activism. The predictors of activism are pro-environmental attitudes, an affective attitude towards nature, and common pro-environmental behaviors, even though they help distinguish a group of barely active members from two groups of more active members, but they do not help distinguish those who are active in a virtual space from those who participate personally. The groups are further distinguished by other variables, such as the locus of control, values, and the phenomenon of quasi-activism. The established connection between knowledge and emotional affinity towards nature seems to represent a reciprocal relationship, and indicates that the right way to learn is to acquire knowledge, but while developing a love for nature.

Paper-based products as promising substitutes for plastics in the context of bans on non-biodegradables

BioResources ◽  
2020 ◽  
Vol 15 (4) ◽  
pp. 7309-7312
Author(s):  
Wei Liu ◽  
Huayu Liu ◽  
Kun Liu ◽  
Haishun Du ◽  
Ying Liu ◽  
...  
Keyword(s):  
Environmental Problem ◽  
Human Life ◽  
Paper Industry ◽  
Pulp And Paper Industry ◽  
Production Costs ◽  
Plastic Pollution ◽  
Paper Properties ◽  
Global Environmental ◽  
The World ◽  
Plastic Products

As a global environmental problem, plastic pollution has attracted worldwide attention. Plastic wastes not only disrupt ecosystems and biodiversity, but they also threaten human life and health. Countries around the world have enacted regulations in recent years to limit the use of plastics. Paper products have been proposed as promising substitutes for plastics, which undoubtedly brings unprecedented opportunities to the pulp and paper industry. However, paper products have some deficiencies in replacing certain plastic products. Research and development to improve paper properties and reduce production costs is needed to meet such challenges.

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