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003 OCoLC;

005 20251021154320.0;

008 790912s1976 xx a bm s000 0 eng d;

035 a| (Sirsi) o05367992;

035 a| (OCoLC)5367992;

043 a| n-us-nc;

049 a| EREE;

050 4 a| QH541.5.W3b| H3x;

100 1 a| Hall, Anthony B.,e| author.?| UNAUTHORIZED;

245 10 a| Total community metabolism modification of an aquatic ecosystem by 2, 4-D application /c| by Anthony B. Hall.;

264 0 c| 1976.;

300 a| 65 leaves :b| illustrations ;c| 28 cm;

336 a| textb| txt2| rdacontent;

337 a| unmediatedb| n2| rdamedia;

338 a| volumeb| nc2| rdacarrier;

502 b| M.S.c| East Carolina Universityd| 1976;

500 a| Submitted to the faculty of the Department of Biology.;

500 a| Advisor: Mark M. Brinson;

520 3 a| A macrophyte community composed primarily of Eurasian watermilfoil (Myriophyllum spicatum L.), located in Kitty Hawk Bay, North Carolina, was treated on 13 July 1974 with a 20% acid equivalent formulation of the butoxyethanol ester of 2,4-dichlorophenoxyacetic acid (2,4-D) attached to attaclay granules (100 Ib/acre). This large-scale application of 2,4-D to an aquatic ecosystem provided a unique opportunity to determine the form or pathways of energy flow and nutrient cycling which replace those found in the ecosystem before the destruction of the Myriophyllum spicatum community. Prior to treatment, diurnals conducted in both treatment and control study areas were indicative of a relatively stable and very productive ecosystem with no extreme changes in oxygen production or consumption. Gross primary productivity (GPP) for the treatment study area (5.64 g 0₂/m²·day) and control study area (4.59 g O₂/m²·day) were quite comparable. Following treatment with 2,4-D there was a tremendous die-back of the M. spicatum community concomitant with an increase in ammonium concentration in the water. Seventeen days following treatment with 2,4-D the lowest oxygen level of the entire study (4,09 mg O₂/ℓ) was obtained in the treatment study area. On 13 August 1974, however, a phytoplankton bloom dominated by two genera of the Cyanophyta (Aphanizomenon and Anacystis) occurred in the treatment area. The highest GPP value during the entire study (12.66 g O₂/m²·day) was obtained where no plankton activity was previously detectable. One year following herbicide application the treatment study area appeared to be returning to a system dominated by macrophytes. Gross primary productivity for the treatment study area (4.25 g O₂/m²·day) and control study area (5.50 g O₂/m²·day) were quite similar. Minimum oxygen levels in the treatment study area were much higher than those after treatment in 1974 and were comparable to the control minimum levels. Plankton biomass and productivity had declined from the values recorded after treatment in 1974 but were still greater than pretreatment values.;

504 a| Includes bibliographical references (leaves 63-65).;

650 0 a| Aquatic ecology.=| ^A59219;

650 7 a| Aquatic ecology.2| fast0| (OCoLC)fst00811988;

655 7 a| dissertations.2| aat0| (CStmoGRI)aatgf300028029;

655 7 a| Academic theses.2| fast0| (OCoLC)fst01726453;

655 7 a| Academic theses.2| lcgft;

655 7 a| Thèses et écrits académiques.2| rvmgf0| (CaQQLa)RVMGF-000001173;

700 1 a| Brinson, Mark M.,e| degree supervisor.1| https://id.oclc.org/worldcat/entity/E39PCjwYVTyybVPT7Vkft74Hyb=| ^A86590;

710 2 a| East Carolina University.b| Department of Biology.=| ^A637467;

856 41 z| Access via ScholarShipu| http://hdl.handle.net/10342/11189;

949 a| Click on web addressw| asish| joyner101;

949 a| Click on web addressw| asish| hsl111;

994 a| C0b| ERE;

590 a| Joyner-"Presented to the faculty of the Department of Biology ... in partial fulfillment of the requirements for the degree Master of Science in Biology.";

596 a| 1 4;

998 a| 165603;

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Total community metabolism modification of an aquatic ecosystem by 2, 4-D application / by Anthony B. Hall.

Author/creator	Hall, Anthony B. author.
Other author	Brinson, Mark M., degree supervisor.
Other author	East Carolina University. Department of Biology.
Format	Theses and dissertations
Production	1976.
Description	65 leaves : illustrations ; 28 cm
Supplemental Content	Access via ScholarShip
Subjects	Aquatic ecology.

Summary	A macrophyte community composed primarily of Eurasian watermilfoil (Myriophyllum spicatum L.), located in Kitty Hawk Bay, North Carolina, was treated on 13 July 1974 with a 20% acid equivalent formulation of the butoxyethanol ester of 2,4-dichlorophenoxyacetic acid (2,4-D) attached to attaclay granules (100 Ib/acre). This large-scale application of 2,4-D to an aquatic ecosystem provided a unique opportunity to determine the form or pathways of energy flow and nutrient cycling which replace those found in the ecosystem before the destruction of the Myriophyllum spicatum community. Prior to treatment, diurnals conducted in both treatment and control study areas were indicative of a relatively stable and very productive ecosystem with no extreme changes in oxygen production or consumption. Gross primary productivity (GPP) for the treatment study area (5.64 g 0₂/m²·day) and control study area (4.59 g O₂/m²·day) were quite comparable. Following treatment with 2,4-D there was a tremendous die-back of the M. spicatum community concomitant with an increase in ammonium concentration in the water. Seventeen days following treatment with 2,4-D the lowest oxygen level of the entire study (4,09 mg O₂/ℓ) was obtained in the treatment study area. On 13 August 1974, however, a phytoplankton bloom dominated by two genera of the Cyanophyta (Aphanizomenon and Anacystis) occurred in the treatment area. The highest GPP value during the entire study (12.66 g O₂/m²·day) was obtained where no plankton activity was previously detectable. One year following herbicide application the treatment study area appeared to be returning to a system dominated by macrophytes. Gross primary productivity for the treatment study area (4.25 g O₂/m²·day) and control study area (5.50 g O₂/m²·day) were quite similar. Minimum oxygen levels in the treatment study area were much higher than those after treatment in 1974 and were comparable to the control minimum levels. Plankton biomass and productivity had declined from the values recorded after treatment in 1974 but were still greater than pretreatment values.
Local note	Joyner-"Presented to the faculty of the Department of Biology ... in partial fulfillment of the requirements for the degree Master of Science in Biology."
General note	Submitted to the faculty of the Department of Biology.
General note	Advisor: Mark M. Brinson
Dissertation note	M.S. East Carolina University 1976
Bibliography note	Includes bibliographical references (leaves 63-65).
Genre/form	dissertations.
Genre/form	Academic theses.
Genre/form	Academic theses.
Genre/form	Thèses et écrits académiques.

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Total community metabolism modification of an aquatic ecosystem by 2, 4-D application / by Anthony B. Hall.

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