Acidic deposition impacts on aquatic biota

D. R. DeWalle

doi:10.1029/91eo00336

Assessment of changes in lake pH in southeastern Canada arising from present levels and expected reductions in acidic deposition

Canadian Journal of Fisheries and Aquatic Sciences ◽

10.1139/f00-128 ◽

2000 ◽

Vol 57 (S2) ◽

pp. 40-49 ◽

Cited By ~ 16

Author(s):

D S Jeffries ◽

D CL Lam ◽

I Wong ◽

M D Moran

Keyword(s):

Air Quality ◽

Acid Rain ◽

Acidic Deposition ◽

Assessment Model ◽

Aquatic Biota ◽

Lake Area ◽

Ecological Significance ◽

Threshold Criterion ◽

Ph Reduction ◽

Sulphate Deposition

An integrated acid rain assessment model was used to estimate pH for six clusters of lakes in southeastern Canada and scenarios of sulphate deposition that reflect the situation (a) before implementation of the SO2 emission controls required by the Canada/U.S. Air Quality Agreement, (b) after implementation of Canadian controls, and (c) after implementation of Canadian and U.S. controls. Modelled lake pHs were always less than their estimated original values. To assess the ecological significance of the pH reduction, scenario "damage" was quantified as the percentage of cluster lakes having pH < 6, a threshold criterion sufficient to protect most aquatic biota. Care was taken to account for naturally acidified lakes. The integrated acid rain assessment model predicted that Canadian SO2 controls will reduce damage in Ontario and Quebec but have little effect in Atlantic Canada. Implementation of U.S. SO2 controls will further reduce damage throughout all regions, although it is conservatively estimated that from 5 to 24% of the lakes will still have pH < 6 depending on cluster. Extrapolating to the inventory of acid-sensitive lakes in southeastern Canada suggests that ~76 000 lakes and ~970 000 ha of lake area will remain chemically damaged unless additional reductions in SO2 emissions are implemented beyond those required by the Air Quality Agreement.

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The Effect of Benzene on Bluegill Olfactory Lamellae

Proceedings, annual meeting, Electron Microscopy Society of America ◽

10.1017/s042482010011965x ◽

1985 ◽

Vol 43 ◽

pp. 574-575

Author(s):

D.R. Mattie ◽

J.W. Fisher

Keyword(s):

Surface Morphology ◽

Soluble Fraction ◽

Lepomis Macrochirus ◽

Sublethal Concentration ◽

Water Soluble ◽

Major Constituent ◽

Jet Fuels ◽

Aquatic Biota ◽

Normal Surface ◽

Cacodylate Buffer

Jet fuels such as JP-4 can be introduced into the environment and come in contact with aquatic biota in several ways. Studies in this laboratory have demonstrated JP-4 toxicity to fish. Benzene is the major constituent of the water soluble fraction of JP-4. The normal surface morphology of bluegill olfactory lamellae was examined in conjunction with electrophysiology experiments. There was no information regarding the ultrastructural and physiological responses of the olfactory epithelium of bluegills to acute benzene exposure.The purpose of this investigation was to determine the effects of benzene on the surface morphology of the nasal rosettes of the bluegill sunfish (Lepomis macrochirus). Bluegills were exposed to a sublethal concentration of 7.7±0.2ppm (+S.E.M.) benzene for five, ten or fourteen days. Nasal rosettes were fixed in 2.5% glutaraldehyde and 2.0% paraformaldehyde in 0.1M cacodylate buffer (pH 7.4) containing 1.25mM calcium chloride. Specimens were processed for scanning electron microscopy.

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Biodiversity of Bucephalandra Motleyana Schott (Schott, 1858) based on commercial name in Jabodetabek: Ornamental Aquatic Biota Market.

JURNAL BIOLOGI UNAND ◽

10.25077/jbioua.8.1.1-8.2020 ◽

2020 ◽

Vol 8 (1) ◽

pp. 1

Author(s):

Media Fitri Isma Nugraha ◽

Ina Erlinawati ◽

Deni Sahroni ◽

Wening Enggarini ◽

Rossa Yunita ◽

...

Keyword(s):

Aquatic Plants ◽

Aquatic Plant ◽

The Other ◽

Research Centre ◽

Aquatic Biota ◽

Commercial Market

Bucephalandra sp. is a genus of aquatic plants endemic to Borneo Island, representing the Araceae family. Bucephalandra sp. is famous for its ornamental aquatic plants which are usually used in aquascaping. These aquatic plants come at fantastic prices, e.g. ±300 euros in European ornamental aquatic markets and Rp 50,000 – 700,000 in Indonesian aquatic plant markets. We collected 195 types of Bucephalandra from an ornamental aquatic plant market in Jakarta. In the market, they are sold under its commercial name. Therefore, the aim of this study is to collect and identify the species of all Bucephalandra types in the aquatic plant commercial market. These species that we identified are based on botanical taxonomist identification in the Herbarium Bogoriense Department Botany – Research Centre for Biology – Indonesian Institute of Science (LIPI) Cibinong. The result of this study is from our collection (195 types) of which 102 types are Bucephalandra Motleyana Schott species and 90 types are the other species of Bucephalandra.

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