Fish distribution in a small domestic water supply reservoir: a case study of Kangimi Reservoir, Kaduna, Nigeria

A study of the composition and distribution of fish populations in the inshore, surface and bottom water habitats of Kangimi Reservoir showed that the most abundant family was the Cichlidae followed in order of abundance by the familiesCyprinidae, Schilbeidae, Mormyridae, Mochokidae, Characidae, centropomidae and Bagridae. Though the overall composition of families caught inn the three habitats did not vary significantly (P>0.05) only family Cichlidae showed habitat preference: there was a preponderance of Cichlidae in the inshore water habitat (P<0.05). The families Bagridae and Centropomidae were caught only in the inshore and bottom water habitats while the other families were caught from all habitats and showed no habitat preference. The dominance of primary and secondary consumers indicates high fish production potential under adequate managemen

The Influence of Aromatic Compounds on Viscosity

Imperial Users onl

Determinants of West African Monetary Zone (WAMZ)countries global export trade: do foreign reserves and independent exchange rates matter?

This study examines the effect of independent exchange rate pursuits and reserve holdings, relative to other determinants, on global export performance of WAMZ countries. The regression results show that exports originating from the Zone to the rest of the world are influenced positively by domestic output, export prices and exchange rate devaluations, but negatively by import price and economic performance of the major global trading partner, proxied by the US GDP. This result is not universal as the Gambia, Ghana and Guinea total exports functions show that exchange rate policy penalized exports contrary to the Nigerian case in which the coefficient estimate is significant and positive. The study infers that these results are consistent with theoretical expectation given the ironical divergence in export basket. Although they are all primary commodity exporters, Nigeria’s exports is mainly crude oil, and a priori expectation is that rapid economic growth or booms in the US should lead to increased demand for energy (healthy competitions). In conclusion, the study infers that since independent flexible exchange rate policy pursuits and reserve holdings makes no difference to the Zonal export performance ex ante, but have great potential for global exports collectively, they could explore an OCA to enhance both intra- and global inter-regional export tradeExchange rate policy, export trade, panel data regression model, WAMZ

Predicting the fisheries potentials of inland reservoirs and lakes: a case study of Kubanni Reservoir, Ahmadu Bello University, Zaria

The depth, alkalinity, total dissolved solids and conductivity of Kubanni Reservoir were monitored biweekly between December 2003 and April 2004. The range values and their means were 0.8-4.64m, 42-67mg/l, 52-71mg/l and 104-142 mhos/cm; 2.8m, 42.6mg/l, 59.8mg/l and 119.6 mhos/cm respectively. Total Dissolved solids correlated significantly (P<0.05) with depth and conductivity while alkalinity correlated highly and significantly(P<0.05) with conductivity, total dissolved solids but negatively correlated with depth. The electrical conductivity was positively and highly correlated with depth while Morpho-Edaphic Index (MEI) which increased with depth decrease correlated positively with conductivity. Based on the average value of the MEI the potential fish catch of the reservoir was estimated to be 38kg/ha. This estimate was compared with other values obtained from other African reservoirs/lakes and management considerations under "private liability company" are proffere

Effects of exchange rate policy on bilateral export trade of WAMZ countries

This study examines the effect of exchange rate policy on the bi-lateral intra-WAMZ and global inter-WAMZ export trade, with a view to gauging its relative veracity among other determinants. The regression results show that the coefficient estimates of bilateral exchange rate (variable of interest in this study) was not significant in explaining the changes in the bilateral intra-WAMZ exports. This is not the case with the world inter-WAMZ regression results in which one of the partner’s exchange rate is significant and positively influences their collective exports to the rest of the world. This result is considered interesting as it tends to validate the assertion that exchange rates does not matter much to intra-WAMZ exports to warrant its use as an instrument of bilateral trade stimulation, but can potentially be useful as a common tool of balance of payment adjustment against the rest of the world (third parties). In conclusion, the study inferred that the maintenance of independent flexible exchange rate policy by either party to the bilateral trade makes no difference in terms of export performance, and may indeed constitute an impediment to free trade within the WAMZ region. Among the impediments identified are the microeconomic costs of foreign exchange conversion and high incident of trade diversion associated with it.Exchange rate policy, export trade; panel data regression model; WAMZ

Inflation differential in the West African Monetary Zone (WAMZ) area:Implications for unionization

This paper examines the determinants of inflation differentials in a panel of West African Monetary Zone (WAMZ) states vis-à-vis its set benchmark for macroeconomic convergence since 2000 to date. Using a stylized 5-country model of WAMZ area, the differences in national inflation is analyzed in light of country specific shocks or differences in the monetary transmission mechanisms. The main results show macroeconomic (price) stabilization around a desired target was not attained. Over the sample period, the un-weighted average regional inflation rates were most often above a single digit target and vary widely among the countries. The major monetary policy instruments determinants of inflationary divergence are the pursuit of distorted interest rates, exchange rates overvaluation and expansionary monetary policies, which penalized credit and accentuated output supply/demand gaps.Inflation differentials, price convergence, exchange rate, WAMZ members, panel data

Monetary policy and economic performance of West African Monetary Zone Countries

This study examined the monetary and macroeconomic stability perspective for entering into monetary union, using data available on WAMZ countries. It tests the hypothesis that independent monetary and exchange rate policies have been relatively ineffective in influencing domestic activities (especially GDP and inflation), and that when they do, they are counter productive. Usiing econometric methods, regression result show that, erstwhile domestic monetary policy, as captured by money supply and credit to government hurt real domestic output of these countries. Indeed, rather than promote growth, it was a source of stagnation. It also confirms that there appear to be a two quarters lag in monetary policy transmission effect with regard to real sector output. The results also show that although expansion in domestic output dampened aggregate consumer prices (inflation), it was however, not adequate enough to dampen the fuelling effects of past inflation. This was accentuated by money supply variable (MS2) and aggravated by exchange rate variable which are mostly positive, confirming the a priori expectations that rapid monetary expansion and devaluations fuels domestic inflation. A country by country comparison of the single and simultaneous equations model results show that expansionary monetary policy contributed more to fuelling prices than it did to growth. It also shows that interest rates policy had adverse effects on GDP by exhibiting a positive sign contrary to the theoretical expectation of an inverse relationship. The results also show that exchange rate devaluations manifest mainly in domestic inflation and have no effect at all on the growth variable, in the short term. The study concludes that these countries would be better-off to surrender its independence over these policy instruments to the planned regional body under appropriate monetary union arrangements.International Monetary Economics; Econometric studies

Exchange rate policy and export performance of WAMZ countries

This study examines the effect of independent exchange rate policy, relative to other determinants, on global export performance of WAMZ countries. The regression results show that exports originating from the Zone to the rest of the world are influenced positively by domestic output, export prices and exchange rate devaluations, but negatively by import price and economic performance of the major global trading partner, proxied by the US GDP. This result is not universal as the Gambia, Ghana and Guinea total exports functions show that exchange rate policy penalized exports contrary to the Nigerian case in which the coefficient estimate is significant and positive. The study infers that these results are consistent with theoretical expectation given the ironical divergence in export basket. Although they are all primary commodity exporters, Nigeria’s exports is mainly crude oil, and a priori expectation is that rapid economic growth or booms in the US should lead to increased demand for energy (healthy competitions). In conclusion, the study infers that since independent flexible exchange rate policy makes no difference to the Zonal export performance ex ante, but have great potential for global exports collectively, they could explore an OCA to enhance both intra- and global inter-regional export trade.Exchange rate policy, export trade, panel data regression model, WAMZ

A kinematic investigation of the influence of anvil air flow over convective nephsystems on high-level horizontal flow

The interactions between horizontal ambient flow and divergent wind fields, such as those that obtain atop cumulonimbus complexes, were investigated (theoretically) kinematically. The following were observed from the results of the analyses. First, for a particular divergent field, the relative mass flux over the area of the nephsystem decreased as the strength of the horizontal flow increased. Secondly, while in some of the cases analyzed the interaction between the two flows only resulted in the fanning out of streamlines and a slight redistribution in the wind speed, in many cases backflows and a total reorganization of the wind field occurred. Backflows have a blocking effect on the horizontal flow. Some of the computed patterns were compared with upper level cloud vectors (from geostationary satellite photographs). The comparison indicated that the computed resultant wind field could be used to explain some features of such satellite-derived wind fields

Selling, resistance and reconciliation : a critical discursive approach to subsidiary role evolution in MNCs

Studies of political dynamics between multinational enterprise (MNE) parents and subsidiaries during subsidiary role evolution have focused largely on control and resistance. This paper adopts a critical discursive approach to enable an exploration of subtle dynamics in the way that both headquarters and subsidiaries subjectively reconstruct their independent-interdependent relationships with each other during change. We draw from a real-time qualitative study of a revealing case of charter change in an important European subsidiary of an MNE attempting to build closer integration across European country operations. Our results illustrate the role of three discourses – selling, resistance and reconciliation – in the reconstruction of the subsidiary–parent relationship. From this analysis we develop a process framework that elucidates the important role of these three discourses in the reconstruction of subsidiary roles, showing how resistance is not simply subversive but an important part of integration. Our findings contribute to a better understanding of the micro-level political dynamics in subsidiary role evolution, and of how voice is exercised in MNEs. This study also provides a rare example of discourse-based analysis in an MNE context, advancing our knowledge of how discursive methods can help to advance international business research more generally