INFLUENCES OF AQUATIC PLANTS ON COLONIZATION OF ARTIFICIAL PONDS BY MOSQUITOES AND THEIR INSECT PREDATORS

1980 ◽  
Vol 112 (8) ◽  
pp. 793-796 ◽  
Author(s):  
Nello P. D. Angerilli ◽  
Bryan P. Beirne
Keyword(s):  
Aquatic Plants ◽  
Lemna Minor ◽  
Elodea Canadensis ◽  
Mosquito Larvae ◽  
Insect Predators ◽  
Artificial Ponds

AbstractThe aquatic plants Utricularia minor L., Lemna minor L., and Elodea canadensis Rich. in Michx. were tested for their effects on the colonization of artificial ponds by mosquitoes and their predators. During the 11 weeks of sampling there were significantly fewer mosquito eggs, and hence mosquito larvae, in the plant-filled ponds than in plantless control ponds, and more predators in the Utricularia and Elodea ponds than in the plantless and Lemna ponds.

Influence of Simazine on Apparent Photosynthesis of Aquatic Plants and Herbicide Residue Removal from Water

Weed Science ◽  
1969 ◽  
Vol 17 (1) ◽  
pp. 56-59 ◽  
Author(s):  
David L. Sutton ◽  
D. A. Durham ◽  
S. W. Bingham ◽  
C. L. Foy
Keyword(s):  
Dissolved Oxygen ◽  
Treatment Period ◽  
Oxygen Evolution ◽  
Aquatic Plants ◽  
Lemna Minor ◽  
Elodea Canadensis ◽  
Residue Removal ◽  
Herbicide Residue ◽  
Nutrient Culture

Simazine (2-chloro-4,6-bis(ethylamino)-s-triazine) at 0.12 to 1.0 ppmw in nutrient cultures of common duckweed (Lemna minor L.), elodea (Elodea canadensis Michx.), and parrotfeather (Myriophyllum brasiliense Camb.) inhibited oxygen evolution within 24 hr. Of the plants studied, the submersed form of parrotfeather exhibited the greatest reduction in apparent photosynthesis as measured by dissolved oxygen in the water. Simazine in nutrient culture without plants remained relatively stable during the treatment period; a slight, but not significant, diminution of chemical was detected after 4 days. Each species, elodea or emersed parrotfeather, reduced the concentration of simazine in solution within 48 hr after treatment.

Diving beetles (Dytiscidae) as predators of mosquito larvae (Culicidae) in field experiments and in laboratory tests of prey preference

2003 ◽  
Vol 93 (3) ◽  
pp. 219-226 ◽  
Author(s):  
E. Lundkvist ◽  
J. Landin ◽  
M. Jackson ◽  
C. Svensson
Keyword(s):  
Body Length ◽  
Negative Correlation ◽  
Laboratory Tests ◽  
Field Experiments ◽  
Mosquito Larvae ◽  
Natural Control ◽  
Large Numbers ◽  
Diving Beetles ◽  
The Mean ◽  
Artificial Ponds

AbstractField experiments were performed in artificial ponds to evaluate how the density of predatory diving beetles (Dytiscidae) would affect the population levels of mosquito larvae (Culicidae). Mosquitoes colonizing the ponds were predominantly species of the genus Culex. In 2000, most of the dytiscids colonizing the ponds were small (Hydroporus spp.), and these predators had no impact on the size of larval mosquito populations, not even in ponds with added dytiscids. In 2001, larger beetles (Ilybius, Rhantus, and Agabus spp.) were more common, and there were significantly fewer mosquito larvae in ponds with the highest numbers of dytiscids. There was a negative correlation between numbers of diving beetles in the ponds and the mean body length of mosquito larvae. In neither year could dytiscid densities be maintained above a certain level owing to emigration. In laboratory tests, there were marked differences between three common dytiscid species in regard to preferences for Daphnia and Culex species as prey: Colymbetes paykulli Erichson chose mosquito larvae more often, whereas both Ilybius ater (De Geer) and I. fuliginosus (Fabricius) preferred Daphnia spp. All of the tested dytiscids consumed large numbers of prey. Since some dytiscid species can efficiently decrease populations of mosquito larvae, they are probably important in the natural control of these dipterans.

scholarly journals Mosquito Larval Abundance in Connected and Isolated Pools Beside a Stormwater Management Pond

2021 ◽  
Vol 37 (3) ◽  
pp. 172-174
Author(s):  
Leslie A. Grand ◽  
Samuel Geller ◽  
James F. Sutcliffe ◽  
David V. Beresford
Keyword(s):  
Stormwater Management ◽  
Larval Abundance ◽  
Mosquito Larvae ◽  
Deep Channel ◽  
Insect Predators

ABSTRACT Twelve experimental pools (30 cm width × 30 cm depth) around a large stormwater management pond (SWMP) were used to test the hypothesis that small puddles of water similar to animal hoofprints or other irregularities support more abundant and diverse mosquito populations due to having fewer insect predators. Six of the 12 pools were connected to the SWMP by a deep channel (7 cm wide × 10 cm depth × 50 cm length). Mosquito larvae and potential predators were sampled weekly over 16 wk in the summer. More mosquito larvae were found in the isolated pools than in connected pools or in the pond itself (U = 5.5, z = 2.002, P = 0.045). The observed differences between isolated and connected pools are presented and results discussed in terms of SWMP design.

scholarly journals Assessment of the effect of heavy metal salts on the photosynthetic activity of aquatic plants

2021 ◽  
pp. 310-318
Author(s):  
G. V. Lobkova ◽  
E. I. Tikhomirova ◽  
Z. A. Simonova
Keyword(s):  
Chlorophyll A ◽  
Fluorescence Intensity ◽  
Aquatic Plants ◽  
Lemna Minor ◽  
Control Level ◽  
Lead Salt ◽  
Chlorophyll B ◽  
Chlorophylls A And B ◽  
Chlorophyll A And B ◽  
Effect Of Copper

The status of the photosynthetic pigments in the aquatic plants Lemna minor L. and Elodea canadensis Michx. under the action of Ni2+, Co2+, Cu2+ and Pb2+ acetate in concentrations 5.00, 2.50, 1.25, 0.62, 0.31, 0.15, 0.07, and 0.03 mg/L was assessed by changes in the fluorescence intensity of chlorophyll a and b and their ratio. It was established that nickel acetate in original solutions in all the above concentrations caused an increase in the fluorescence intensity of chlorophylls a and b in L. minor in relation to the control while the lead salt suppressed it. Co2+ acetate inhibits the fluorescence of chlorophyll a with concentrations in the initial solutions of 0.03 to 0.15 and 2.50 mg/L and that of chlorophyll b at all concentrations, except 0.62, 1.25 and 2.50 mg/L. For E. canadensis it was found that the salts of all metals at all concentrations caused a reduction of the fluorescence intensity of chlorophyll a relative to the control and increased it in the case of chlorophyll b. The exception is the effect of copper and lead acetates with a concentration of 1.25 mg/L, when the fluorescence intensity of chlorophyll b is maintained at the control level. The presence of Ni2+, Co2+, Cu2+, and Pb2+ acetates in all concentrations in the culture medium influences the quantitative and qualitative characteristics of chlorophyll a and b, which indicates a violation of the photosynthesis process. Our data on the change in the chlorophyll a / b ratio leads to a conclusion about degradation of chlorophyll a relative to chlorophyll b after the effect of heavy metals.

scholarly journals Hydrothermal Carbonization and Pellet Production from Egeria densa and Lemna minor

Plants ◽  
2020 ◽  
Vol 9 (4) ◽  
pp. 425 ◽  
Author(s):  
Xana Álvarez ◽  
Ángeles Cancela ◽  
Vanesa Freitas ◽  
Enrique Valero ◽  
Ángel Sánchez ◽  
...  
Keyword(s):  
Aquatic Plants ◽  
Invasive Plant ◽  
Lemna Minor ◽  
Maximum Yield ◽  
Hydrothermal Carbonization ◽  
Egeria Densa ◽  
North West ◽  
Exotic Invasive Species ◽  
Excessive Nutrients ◽  
Forms Of Carbon

Biofuels are seen as a potential option for mitigating the effects of fossil fuel use. On the other hand, nutrient pollution is accelerating eutrophication rates in rivers, lakes, and coastal waters. Harvesting aquatic plants to produce biofuels could mitigate this problem, though it is important to attack the problem at source, mainly as regards the contribution of nutrients. For the first time, solid biofuels were obtained in the forms of carbon and pellets from the aquatic plants Egeria densa, which is classed as an invasive plant under the Spanish Catalogue of Exotic Invasive Species, and Lemna minor, both of which can be found in the Umia River in north-west Spain. The essential oils and macro- and microelements present in both these plants were also extracted and analyzed. The higher heating values (HHVs) of the carbon products obtained ranged from 14.28 to 17.25 MJ/kg. The ash content ranged from 22.69% to 49.57%. The maximum yield obtained for biochar for Egeria densa at 200 °C was 66.89%. Temperature significantly affects solid hydrochar yield. The HHVs of the pellets obtained ranged from 11.38 to 13.49 MJ/kg. The use of these species to obtain biofuels through hydrothermal carbonization (HTC) and pellets is a novel and effective approach that will facilitate the removal of nutrients that cause eutrophication in the Umia River. The elements extracted show that harvesting these plants will help to remove excessive nutrients from the ecosystem.

Sign in / Sign up

Export Citation Format

Share Document