Metal Toxicity Can Affect Dragonfly Nymphs and Ostracods Predation Rates and Food Selectivity: Ecological Implications on Food Webs

2021 ◽  
Vol 232 (7) ◽  
Author(s):  
Júlio César dos Santos Lima ◽  
Raquel Aparecida Moreira ◽  
Antonio José Gazonato Neto ◽  
Douglas de Pádua Andrade ◽  
Emanuela Cristina Freitas ◽  
...  
Keyword(s):  
Food Webs ◽  
Metal Toxicity ◽  
Food Selectivity ◽  
Ecological Implications ◽  
Predation Rates ◽  
Dragonfly Nymphs

Cadmium and Zinc Toxicity and Synergism to Floating Aquatic Plants

1972 ◽  
Vol 7 (1) ◽  
pp. 59-65 ◽  
Author(s):  
T.C. Hutchinson ◽  
Halina Czyrska
Keyword(s):  
Aquatic Plants ◽  
Food Chain ◽  
Metal Toxicity ◽  
Inhibitory Effect ◽  
The Other ◽  
Zinc Toxicity ◽  
Natural Field ◽  
Ecological Implications ◽  
Low Levels ◽  
Potential Food

Abstract Floating aquatic plants have been used in a study of the uptake, toxicity and synergism of cadmium and zinc. Both of the species used were found to accumulate the metals, from even very low levels in solution. Cadmium at 0.01 p.p.m. had an inhibitory effect on growth; and 0.1 p.p.m. was enough to cause death. A concentration factor of up to 9500 times occurred; with clear implications of potential food chain effects. Interspecific competition was found to be a further factor influencing metal toxicity. In natural ‘field’ situations, biological competition is the norm. Cadmium and zinc acted synergistically together. Zinc markedly increased the inhibitory effect of cadmium, even though it was itself stimulatory. The presence of one metal also increased the uptake of the other The ecological implications are discussed.

scholarly journals How to predict community responses to perturbations in the face of imperfect knowledge and network complexity

2013 ◽  
Vol 280 (1773) ◽  
pp. 20132355 ◽  
Author(s):  
Helge Aufderheide ◽  
Lars Rudolf ◽  
Thilo Gross ◽  
Kevin D. Lafferty
Keyword(s):  
Food Webs ◽  
Efficient Allocation ◽  
Iterative Technique ◽  
Community Responses ◽  
Precise Information ◽  
Top Predators ◽  
The Face ◽  
Imperfect Knowledge ◽  
Efficient Measurement ◽  
Predation Rates

Recent attempts to predict the response of large food webs to perturbations have revealed that in larger systems increasingly precise information on the elements of the system is required. Thus, the effort needed for good predictions grows quickly with the system's complexity. Here, we show that not all elements need to be measured equally well, suggesting that a more efficient allocation of effort is possible. We develop an iterative technique for determining an efficient measurement strategy. In model food webs, we find that it is most important to precisely measure the mortality and predation rates of long-lived, generalist, top predators. Prioritizing the study of such species will make it easier to understand the response of complex food webs to perturbations.

Validating a food avoidance assessment for children with food selectivity.

2018 ◽  
Vol 23 (2) ◽  
pp. 89-105 ◽  
Author(s):  
Katherine R. Kunkel ◽  
Alison M. Kozlowski ◽  
Tessa Taylor ◽  
Melissa L. González
Keyword(s):  
Food Selectivity ◽  
Food Avoidance

Subsets of food webs cannot be used as a substitute to assess the functioning of entire ecosystems

2019 ◽  
Vol 613 ◽  
pp. 49-66 ◽  
Author(s):  
VN de Jonge ◽  
U Schückel ◽  
D Baird
Keyword(s):  
Food Webs
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