The relationship between sediment metal concentration and Odonata (Insecta) larvae assemblage structure in Cerrado streams

Limnetica ◽  
2022 ◽  
Vol 41 (1) ◽  
pp. 27-41
Author(s):  
Cyntia Goulart Corrêa Bruno ◽  
Regina Célia Gonçalves ◽  
Ademir dos Santos ◽  
Kátia Gomes Facure ◽  
Juliano José Corbi ◽  
...  
Keyword(s):  
Metal Concentration ◽  
Assemblage Structure ◽  
The Relationship ◽  
Sediment Metal

Sediment pH and Redox Potential Affect the Bioavailability of Al, Cu, Fe, Mn, and Zn to Rooted Aquatic Macrophytes

1993 ◽  
Vol 50 (1) ◽  
pp. 143-148 ◽  
Author(s):  
Leland J. Jackson ◽  
Jacob Kalff ◽  
Joseph B. Rasnnussen
Keyword(s):  
Redox Potential ◽  
Metal Content ◽  
Aquatic Macrophytes ◽  
Organic Content ◽  
Trophic Levels ◽  
Sediment Organic Content ◽  
Sediment Ph ◽  
The Relationship ◽  
Sediment Metal

We have evaluated the role of sediment pH (4.7–7.1) and redox potential (88–305 mV) in determining the bioavailability of five metals to four species of isoetoid macrophytes. The four species (Eleocharis acicularis, Eriocaulon septangulare With., Isoetes sp., and Sagittaria graminae) did not differ significantly in the relationship between the contents of metals in plants and sediment. When data for all species were pooled, 28–80% of the variation in the log of plant metal content was explained by the log of sediment metal (Al, Fe, and Mn) or by the log of sediment organic content (Cu and Zn). Sediment pH explained 45% (Al), 10% (Cu), 20% (Fe), 5% (Mn), and 12% (Zn) variation over and above that explained by the sediment metal content. These results demonstrate that lower sediment pH, in the presence of mildly oxic redox conditions, increases the bioavailability of these five trace metals to rooted aquatic plants. Rooted macrophytes subject to acidification contain higher metal concentrations which may be transferred by grazing to higher trophic levels.

Sediment Metal Concentration Survey Along the Mine-Affected Molonglo River, NSW, Australia

2016 ◽  
Vol 70 (3) ◽  
pp. 572-582 ◽  
Author(s):  
Chamani P. M. Marasinghe Wadige ◽  
Anne M. Taylor ◽  
Frank Krikowa ◽  
William A. Maher
Keyword(s):  
Metal Concentration ◽  
Sediment Metal

scholarly journals Spatiotemporal Dynamics of Stream Fish Assemblages Over Four Decades

2019 ◽  
Author(s):  
Zachery D. Zbinden
Keyword(s):  
Spatial Scale ◽  
Fish Assemblages ◽  
Global Scale ◽  
Assemblage Structure ◽  
Fish Assemblage Structure ◽  
Compositional Change ◽  
Spatial Scaling ◽  
Sampling Locations ◽  
Stream Fish Assemblages ◽  
The Relationship

ABSTRACTFish assemblage structure was compared between 1974 and 2014 at 33 sampling locations in the Muddy Boggy River drainage, OK. The two main objectives for this comparison were to first quantify change in assemblage structure, and, second, to test for a relationship between compositional change and spatial scale. Spatial scale was manipulated by pooling assemblage data into groups ranging from K=33 pairs (i.e., local scale) to K=1 pair (i.e., global scale). Local assemblages varied in the degree of assemblage change over 4 decades (range=10-99% dissimilarity; mean=66%). The global assemblage remained quantitatively and qualitatively similar: most species persisted through time and those that did not were rare, and several diversity measures were not significantly different between time periods. Pooling assemblage data into consecutively larger groups and assessing the resultant compositional change revealed interesting patterns indicative of domains of spatial scaling. A discontinuity in the relationship between compositional change and spatial scale occurred at K=15, and this grouping is roughly the size of the headwater/tributary drainages of the Muddy Boggy system. This result suggests assemblages are more predictable when defined at scales larger than a stream reach, and a domain of higher predictability exists at a scale smaller than the entire drainage.

Multivariate approaches to determine the relationship between fish assemblage structure and environmental variables in Karatoya River, Bangladesh

2020 ◽  
Vol 21 (2) ◽  
pp. 171-181
Author(s):  
Most. Mahmuda Akhi ◽  
Md. Abu Sayed Jewel ◽  
Md. Ayenuddin Haque ◽  
Biplob Kumer Sarker ◽  
Mst. Samsad Khatun ◽  
...  
Keyword(s):  
Fish Assemblage ◽  
Environmental Variables ◽  
Assemblage Structure ◽  
Fish Assemblage Structure ◽  
Multivariate Approaches ◽  
The Relationship

Interstellar gas in the central region of the Galaxy

1967 ◽  
Vol 31 ◽  
pp. 239-251 ◽  
Author(s):  
F. J. Kerr
Keyword(s):  
Central Region ◽  
Galactic Plane ◽  
Neutral Hydrogen ◽  
Continuum Emission ◽  
Galactic Centre ◽  
Interstellar Gas ◽  
Hydrogen Recombination ◽  
The Galaxy ◽  
Centre Region ◽  
The Relationship

A review is given of information on the galactic-centre region obtained from recent observations of the 21-cm line from neutral hydrogen, the 18-cm group of OH lines, a hydrogen recombination line at 6 cm wavelength, and the continuum emission from ionized hydrogen.Both inward and outward motions are important in this region, in addition to rotation. Several types of observation indicate the presence of material in features inclined to the galactic plane. The relationship between the H and OH concentrations is not yet clear, but a rough picture of the central region can be proposed.

The relationship of the scleractinian corals to the rugose corals

Paleobiology ◽  
1980 ◽  
Vol 6 (02) ◽  
pp. 146-160 ◽  
Author(s):  
William A. Oliver
Keyword(s):  
Critical Points ◽  
Scleractinian Corals ◽  
Convincing Evidence ◽  
Early Triassic ◽  
Rugose Corals ◽  
History Of ◽  
The Subject ◽  
Relationship Of ◽  
The Relationship ◽  
Biologic Factors

The Mesozoic-Cenozoic coral Order Scleractinia has been suggested to have originated or evolved (1) by direct descent from the Paleozoic Order Rugosa or (2) by the development of a skeleton in members of one of the anemone groups that probably have existed throughout Phanerozoic time. In spite of much work on the subject, advocates of the direct descent hypothesis have failed to find convincing evidence of this relationship. Critical points are:(1) Rugosan septal insertion is serial; Scleractinian insertion is cyclic; no intermediate stages have been demonstrated. Apparent intermediates are Scleractinia having bilateral cyclic insertion or teratological Rugosa.(2) There is convincing evidence that the skeletons of many Rugosa were calcitic and none are known to be or to have been aragonitic. In contrast, the skeletons of all living Scleractinia are aragonitic and there is evidence that fossil Scleractinia were aragonitic also. The mineralogic difference is almost certainly due to intrinsic biologic factors.(3) No early Triassic corals of either group are known. This fact is not compelling (by itself) but is important in connection with points 1 and 2, because, given direct descent, both changes took place during this only stage in the history of the two groups in which there are no known corals.

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