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The assemblage of bacteria and fungi associated with red imported fire ants (RIFA) Solenopsis invicta Buren was obtained from Hinds, Leake, and Madison Counties (location) along Natchez Trace Parkway in Mississippi. The sites were selected due to the limited presence of RIFA within the park and the more natural, undisturbed ecosystem. Active mounds containing soil, plant debris, and RIFA (substrate) were collected in March, July, and November of 2004 (time). Samples were processed according to standard microbiological protocols, and microorganisms identified using morphological, biochemical and molecular methods. A total of 71 bacteria (2324 isolates) and 50 fungi (1445 isolates) were obtained. The most common bacterium and fungus identified were Bacillus sp. B76(B)Ydz-zz, and Trichoderma aureoviride strain IMI 113135. The fungal entomopathogens Paecilomyces lilacinus and Metarhizium anisopliae var. anisopliae were isolated from mound soil, plant debris, and external tissues of the ants. Patterns of species richness, diversity, and evenness values across substrates were 71, 1.58, and 0.37 for bacteria, and 50, 1.11 and 0.28 for fungi, respectively. Total coefficient of community values for bacteria were 0.74 – 0.89 and 0.79 – 0.92 for fungi indicating uniform communities. No consistent trends were observed by comparing substrate, location, and sampling date. However, fungi species richness and diversity for ant external tissues were significantly higher than internal tissues of the ant. Selected bacteria and fungi were evaluated for their biological control and/or antagonistic potential in vitro and in situ. The most promising isolates studied in vitro included Paenibacillus sp. JA-08, Aspergillus terreus, and Aspergillus sp. HZ-35 with death rates on mound soil surface at 4.4, 5.0, and 4.8. The fungus Metarhizium anisopliae var. anisopliae strain LRC 211 had low death rate (1.8) on mound soil during in vitro trial but showed the greatest biocontrol potential during in situ evaluation. After 14 days in situ evaluation, the living RIFA extracted showed sluggish movement and the fungus was recovered from dead (48.3%) and living (33.3%) RIFA. Since the in situ trials were conducted only at one location and season, additional tests, including microscopic documentation of parasitism/pathogenicity, are needed to confirm the results of this study.

The red imported fire ant (RIFA) was introduced to the United States from South America over 75 years ago, and has become a pest in wildlife settings. Hydramethylnon fire ant bait has been the industry standard for controlling the red imported fire ant. It can be compared to novel baits, and used to evaluate different aerial application techniques, such as the "skip swath" method. Two baits, hydramethylnon and metaflumizone, and a skipped-swath method were evaluated through observations of the activity levels of RIFA mounds and abundance. The effects of RIFA on other ant species were determined by eliminating RIFA with insecticides, and then sampling for all remaining ant species. Measurements of RIFA mound activity was done by recording their response to the vibration of wire flags located in active mounds. This method indicated control of RIFA with hydramethylnon and metaflumizone from 61 to 180 d post-treatment. Additional monitoring for RIFA activity, in the same plots, was done with baited vials. These results indicated that complete control of RIFA was never achieved with either hydramethylnon or metaflumizone within 180 d post-treatment; however, there were significant reductions in RIFA population as a result of both chemical baits from 3-92 d post-treatment. A reduction of RIFA populations occurred with both baits, as determined through scheduled sampling of all ant species using baited vials. Native ants, such as Dorymyrmex spp., were found in higher numbers once RIFA populations were reduced, indicating that the two ant species compete for resources such as food and space. Dorymyrmex spp. numbers were suppressed by RIFA populations, while other ants, such as Paratrechina spp. were unaffected.

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With the fast growing Chinese online marketplace and the increasing popularity of shopping imported products online in China, more and more practitioners and researchers are interested in understanding the cues that Chinese consumers use to evaluate imported products consumption online. Our quantitative study aims to identify what factors affect the behavior of Chinese online consumers towards imported products and the relationships between the identified factors and purchase intention, and thereafter help companies to understand how to increase Chinese online consumers’ purchase intention of imported products. The research model is developed based on The Theory of Planned Behavior. Data were collected through web-based survey in China. Subsequently, the logistic regression in SPSS was used for testing the 12 hypotheses. Results reveal that the purchase intention of Chinese online consumers to imported products is closely associated with Perceived Behavioral Control, Subjective Norms, Perceived Risks, Service Quality, Country of Origin and Price. However, Product Variety and graphically well-designed websites are not relevant to purchase intention when Chinese consumers evaluate online imported products. The findings of our study serve as a link between consumers and online retailers or companies. The information from this study can add knowledge to limited studies on the behavior of Chinese online consumer.

This dissertation investigates the effects of foreign direct investment (FDI) and international trade on firm level decisions and examines the effect of policy changes on aggregate productivity and welfare in open economies. The first two chapters build an open economy model of FDI and trade where heterogeneous firms make simultaneous foreign investment and export decisions. The theoretical model is estimated using Indonesian manufacturing data. The estimated model is then used to perform a variety of counterfactual experiments to assess the positive and normative effects of international barriers to trade and FDI. I find that the impact of FDI on aggregate productivity is at least three times the impact of international trade on aggregate productivity. The third chapter, co-authored with Hiroyuki Kasahara, investigates whether importing intermediate goods improves plant performance. While addressing the issue of simultaneity between productivity shocks and the decision to import intermediates, we estimate the impact of the use of foreign intermediates on plants' productivity using plant-level Chilean manufacturing panel data. We find that by importing foreign intermediates, manufacturing plants can improve productivity. / Thesis (Ph.D, Economics) -- Queen's University, 2008-06-20 10:21:01.069

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The thesis investigates three selected issues pertaining to the Malaysian Manufacturing sector namely industries growth channels, imported inputs and intra-industry trade determinants. For each of this issue we have adopted a static and a dynamic estimation approach. In the static estimation the result presented are based on Ordinary Least Square, Fixed and Random Effect besides Generalized Least Square estimations. Meanwhile in the dynamic estimation, we focused on result of the difference and system GMM estimations. For industries growth channels, the findings suggest that at aggregate industry level, fixed capital formation and human capital channels are always statistically significant regardless of the test applied either in static or dynamic models estimation. The significance of fixed capital formation is consistent with the strong and cumulative saving and investment condition in Malaysia which has had a significant effect on the capital formation of the country. Our findings for foreign direct investment channel might suggest that Malaysian manufacturing industries has had problem to absorb the transfer of technology that had impede the growth of the sector. Meanwhile, a negative association between government consumption and economic growth might indicate that the government expenditures pattern might have distort the allocation of resources in the economy especially the manufacturing sector. Our findings suggest that the nature of the relationship between manufactured exports and economic growth is negative which might indicate that Malaysian manufactured exports were actually driven by the economy growth. Further analysis at individual export-oriented industry level shows that manufactured exports and government consumption channels have influence growth in both resource-based and non-resource based industries. Our analysis also include trade liberalization estimation which suggest that trade liberalization has a positive causality relationship with the growth of industries through all selected channels. Regarding the imported inputs analysis, the dynamic estimation results show that imported inputs have a positive relationship with industries owned by the non-Malaysian, but not for industries owned by the Malaysian. Our finding for industries owned by the Malaysian is consistent with the government actions that have strongly encouraged them to use domestic inputs through implementation of various incentives. This is because the implementation of the first round of the Import Substitution phase (1957-1967), had created an industrialization era which relied heavily on imported inputs and machines which resulted in distortions in domestic product prices, low value added, poor domestic economy linkages and inequalities in income and employment. On the contrary, our findings for all static and dynamic models suggest that imported input have a positive relationship with the growth of industries owned by non-Malaysian. This result might indicate that industries whose import their intermediate inputs have increased their growth performance and productivity. Meanwhile, at firms’ level, imported inputs suggest a positive relationship with firms owned by both Malaysian and non-Malaysian. Our analysis again include trade liberalization estimation which show that trade liberalization have a positive relationship with the imported inputs content in industries owned by Malaysia while at firms level, only non-tariff index shows a positive relationship. Last issue relates to the intra industry trade in Malaysian manufacturing sector. Our findings suggest that the gross domestic products variables which proxies the market size of a country, the similarity in income and the relative size effects between Malaysia and its trading partners has had influence the share of intra industry trade of the manufactured goods. As for the other country-characteristic determinants, we found a positive relationship between foreign direct investment and the share of intra-industry trade which support the theoretical framework proposed by Grubel and Lloyd (1975) and Greenaway and Milner (1986). Similarly, distance and trade imbalance also indicates a significant negative relationship with the trade share. Meanwhile at individual industry level, our findings suggest that a majority of the gross domestic product variables indicate a statistically significant relationship with the trade share in the dynamic estimation models for the wood, textiles and electrical and electronic industries. Contradictory, the maximum value of gross domestic products has a statistically significant relationship in the static estimation models for the rubber, textiles and electrical and electronic industries, respectively. Meanwhile, the other country-characteristic determinants such as foreign direct investment, trade imbalance and trade orientation have a statistically significant relationship in both static and dynamic estimations models in a majority of the Malaysian export-oriented industries. On the other hand distance, border and asean have a statistically significant relationship in only the static estimation models for the industries.