Effect of Algal Food Concentration on Toxicity of Two Agricultural Pesticides to Daphnia carinata

1995 ◽  
Vol 32 (3) ◽  
pp. 273-279 ◽  
Author(s):  
M.J. Barry ◽  
D.C. Logan ◽  
J.T. Ahokas ◽  
D.A. Holdway
Keyword(s):  
Food Concentration ◽  
Daphnia Carinata ◽  
Agricultural Pesticides ◽  
Algal Food

Functional response to Daphnia carinata King when feeding on the filamentous diatom Melosira granulata

1993 ◽  
Vol 44 (5) ◽  
pp. 761 ◽  
Author(s):  
CR King ◽  
RJ Shiel
Keyword(s):  
Functional Response ◽  
Food Item ◽  
Ingestion Rate ◽  
Dry Weight ◽  
Food Concentration ◽  
Daphnia Carinata ◽  
Food Concentrations

The functional response of D. carinata feeding on M. granulata was determined from laboratory trials conducted at 20-22�C, using a range of food concentrations (F) from 0.14 to 33.8�g (dry weight) mL-1. The functional response could be described by an lvlev model: I (ingestion rate, ng �g-1 h-1) = 200 - 205 × exp (- 0.036 × F). The ingestion rate at the highest food concentration (33.8 �g mL-1) was 140 ng �g-1 h-1, and there was no evidence to suggest that M. granulata either interfered with feeding at high densities or was a difficult food item for D. carinata to handle.

Larval settlement behaviour of the barnacle Balanus reticulatus in the laboratory

2002 ◽  
Vol 82 (4) ◽  
pp. 579-582 ◽  
Author(s):  
V. Thiyagarajan ◽  
K.V.K. Nair ◽  
T. Subramoniam ◽  
V.P. Venugopalan
Keyword(s):  
Dominant Species ◽  
Larval Settlement ◽  
Food Concentration ◽  
Test Material ◽  
Organic Polymers ◽  
Algal Food ◽  
Food Quantity ◽  
Glass Surfaces ◽  
Settlement Behaviour

The effect of algal food concentration, substratum, light, salinity, cyprid density and ‘footprints’, cyprid age, films of organic biopolymers, bacteria and diatoms on the settlement of Balanus reticulatus cyprids were studied. The algal food quantity (from 7×104 to 4×105 cells ml−1) fed to nauplii had a significant effect on the settlement. Cyprids failed to settle on glass surfaces but would settle on polystyrene. Light, cyprid ‘footprints’ and age significantly affected the settlement, however, salinity (from 20 to 40 psu) and cyprid density (from 5 to 200 per 5 ml of seawater) had no effect on the settlement. Films of organic polymers, bacteria, and diatoms inhibited the settlement compared to control. It is suggested that cyprids of B. reticulatus can serve as an appropriate test material for antifouling bioassays in those areas where the former forms a dominant species.

scholarly journals Diel horizontal distribution of microcrustaceans and predators throughout a year in a shallow neotropical lake

2013 ◽  
Vol 73 (1) ◽  
pp. 103-114 ◽  
Author(s):  
MS. Arcifa ◽  
TC. Bunioto ◽  
A. Perticarrari ◽  
WJ. Minto
Keyword(s):  
Dissolved Oxygen ◽  
Shallow Lake ◽  
Food Concentration ◽  
Horizontal Distribution ◽  
Water Mites ◽  
Monthly Basis ◽  
Algal Food ◽  
Horizontal Migration ◽  
Adaptive Value ◽  
Invertebrate Predators

The focus of this study is to investigate if microcrustaceans undergo diel horizontal migration (DHM) in a tropical shallow lake on a yearly basis and analyse the adaptive value regarding predation. Abundance of invertebrate predators, chaoborid larvae and water mites, and microcrustaceans (cladocerans and copepods) were evaluated on a monthly basis in three stations located on a transect during the day and at night. Both invertebrate predators were predominantly pelagic. Cladocerans did not undergo significant DHM, distributing indistinctly onshore and offshore or being mostly pelagic. Nauplii, copepodites of two copepod species and adults of Tropocyclops prasinus meridionalis Kiefer were mostly distributed offshore, and did not perform DHM. The limnological features (temperature, dissolved oxygen, pH, and conductivity) were suitable for the organisms in both zones of the lake. Algal food concentration was a little lower in the littoral than in the limnetic zone during the day, but it seems to be suitable for the organisms. However, as the algae quality was not evaluated, it is not possible to be conclusive concerning its influence. The results indicated that DHM was not performed by the microcrustaceans and is not, therefore, a strategy for decreasing predation by both invertebrates, Chaoborus brasiliensis Theobald and Krendowskia sp., on a yearly basis in this shallow lake.

Worker Protection Standard: Information at a Central Location

EDIS ◽  
2016 ◽  
Vol 2016 (7) ◽  
Author(s):  
Frederick M. Fishel ◽  
Tatiana Sanchez
Keyword(s):  
Direct Contact ◽  
Agricultural Workers ◽  
Specific Information ◽  
Federal Regulation ◽  
Central Location ◽  
Agricultural Pesticides ◽  
Full Implementation ◽  
Standard Information ◽  
Agricultural Plants ◽  
General Guidance

The Worker Protection Standard (WPS) is a Federal regulation designed to protect agricultural workers (people involved in the production of agricultural plants) and pesticide handlers (people mixing, loading, or applying pesticides or doing other tasks involving direct contact with pesticides). It has been in full implementation since 1995. This document provides general guidance to help you comply with the requirements of the Federal Worker Protection Standard (WPS) for agricultural pesticides, 40 CFR part 170, as amended in 2015. This document addresses specific information that agricultural establishments must display at a central location for their employees.

The Mediterranean Action Plan: A Regional Approach to Pollution Control

1986 ◽  
Vol 18 (9) ◽  
pp. 197-205
Author(s):  
Lj Jeftié ◽  
L. J. Saliba
Keyword(s):  
Mediterranean Sea ◽  
Action Plan ◽  
Control Measures ◽  
Industrial Wastes ◽  
Pollution Monitoring ◽  
Environmental Preservation ◽  
Agricultural Pesticides ◽  
The Mediterranean ◽  
A Prospective Study ◽  
And Control

Increasing concern over the deterioration of the Mediterranean sea as a result of increasing pollution by untreated sewage and industrial wastes, agricultural pesticides and fertilizers and oil discharges, led to a series of meetings between 1970 and 1974, and finally to the UNEP-sponsored Mediterranean Action Plan, adopted by governments of the region in 1975 and ongoing since that time. The legal component of the Plan includes a framework Convention and four protocols; the environmental assessment component (the MED POL programme) consists of national pollution monitoring programmes, and research projects conducted by Mediterranean institutions; the environmental management component consists of the Blue Plan (a prospective study combining socio-economic development with environmental preservation) and the Priority Actions Programme (a series of sub-region sectoral projects in defined areas). The Plan has been financed by Mediterranean States since 1979, and is managed by UNEP with the cooperation of other competent UN Agencies. During the last ten years, activities undertaken have improved knowledge of the state of pollution of the Mediterranean sea, and facilitated joint regional action in the form of preventive and control measures.

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