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Effects of Coal Ash Pollution on Population Genetic Structure and Morphological Characteristics of Brachionus Calyciflorus

Author: ZhangGen
Tutor: XiZuoLong
School: Anhui Normal University
Course: Zoology
Keywords: Calyciflorus rotifers Fly ash Genetic structure Morphological characteristics
CLC: Q958
Type: Master's thesis
Year: 2011
Downloads: 23
Quote: 0
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The theory analysis through the water with disabilities and calyciflorus rotifer rDNA ITS and mtDNA COI sequence analysis, and different food density (0.75 × 10 6 1.5 × 10 6 3.0 × 10 6 and 6.0 × 10 6 cells / mL) under rotifers morphological parameters measured with disabilities, a comparative study of fly ash and polluted water (gray lake) uncontaminated water this (of Fengming Lake Tingtang Lake) calyciflorus rotifer population genetic structure and their morphological parameters in different food density. Main Guests results below. 1, fly ash contamination caused by the rise in pH of the water present, the standard limit of As, B, Mo, Sb, Se, and V elements than surface water containing disabilities of Al, As, B, Ca, Cr, K, Li, Mo, , Se, Si and V content with disabilities is significantly higher than the two control lakes; soluble nitrogen and chlorophyll a with disabilities is significantly lower than the two control lakes. 2, rDNA ITS and mtDNA COI sequence analysis supported the study involved calyciflorus rotifers divided into two sibling species, which sibling species I for the three lakes Total sibling species II exist only in Lake Tingtang The Lake and Fongming. Fly ash pollution calyciflorus rotifer species composite of the genetic diversity reduce sibling species reduced number of disabilities, which may be related to the ecological characteristics of the sibling species II. On three lakes and a total of sister species Ⅰ in terms of rDNA ITS sequence analysis showed that the gray lake rotifer lowest haplotype diversity (h = 0.9516), nucleotide diversity (π = 0.0066) lower than Ting Tanghu, ( π = 0.0073) was high Yu Fengming Lake rotifer population (π = 0.0052); mtDNA COI sequence analysis indicates that the gray lake rotifer population haplotype diversity and nucleotide diversity (h = 0.9608; π = 0.0292 ) are lower than Lake Tingtang, (h = 0.9722; π = 0.0300), while the high-Yu Fengming lake rotifer population (h = 0.9581; π = 0.0083). Showed the damaging effects of coal ash pollution calyciflorus rotifer population genetic diversity. Fengming Lake the rotifer population genetic diversity is low, it may be due to the crystalline capsule rotifers and copepods in the water this sub predation pressure is higher and the surrounding farmland pollution caused by the combined effects of. AMOVA analysis showed that there is a significant genetic differentiation between the three lakes rotifer population, F st and gene flow analysis showed that genetic differentiation among the main three lakes rotifer population with disabilities exist in the Ting Tanghu with Fengming Lake between rotifer population, rather than fly ash pollution of lakes and unpolluted lakes between. 3 to 0.75 × 10 6 1.5 × 10 6 3.0 × 10 6 and 6.0 × 10 6 Scenedesmus obliquus cells / mL for the food, a comparative study of the morphological differences between the the the three lakes rotifer sibling species I and the Ting Tanghu two sister species of rotifer. The results show that the gray Lake rotifers in 3.0 × 10 6 cells / mL food density, Ting Tanghu, rotifers 0.75 × 10 6 and 1.5 × 10 6 cells / mL food density; Fengming Lake I rotifer sibling species and Ting Tanghu, sibling species Ⅱ rotifers of this size does not significantly change with the changes in the density of the food. As food density increases, the lakes round eggs plot also showed a significant downward trend, the rotifers clutch size increase with higher food density the single egg Nenshi reduce related. In addition to the 6.0 × 10 6 Fengming Lake the rotifers with the Ting Tanghu sisters kinds I rotifers rear spines long was no significant difference in the density of cells / mL food outside, the rest of the food density Fengming Lake round The back side of the insect spines are the longest, which may be related to higher predator density Fengming lake this; does not have this reaction but the front side of thorns and the thorns. 1.5 × 10 6 and 6.0 × 10 6 cells / mL food density gray Lake rotifers are significantly smaller than the Ting tong Lake rotifers; 0.75 × 10 < sup> 6 and 3.0 × 10 6 cells / mL food density, the gray lake round eggs the plot were significantly greater than Ting Tanghu, rotifers, which may be because of the smaller of the two this is conducive to the rapid propagation of rotifers and larger eggs can output more resistant young this, so as to adapt to the pollution stress environment. Ting tong Lake rotifer sibling species a this, in addition to the 0.75 × 10 6 cells / mL food density both posterior spines long no significant difference between the rest of the food density sibling species II rotifer morphological indicators were significantly greater than the sibling species I. The morphology of two sibling species discriminant analysis accurately rate higher than 95%; significant morphological differences between the two sibling species.

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