Surface distribution of microphytoplankton of the south-west Indian Ocean along a repeat transect between Cape Town and the Prince Edward Islands

Surface chlorophyll-a (chl-a) concentrations, microphytoplankton (>20 μm) species composition and distribution along a repeat transect between Cape Town and the Prince Edward Islands were investigated in early austral autumn (April/May) 1996. Samples were collected at approximately 30 nautical mile intervals for the analysis of size-fractionated chl-a and the identification and enumeration of microphytoplankton species. Peaks in total chl-a (>1 μg 1 [superscript -1]) were recorded at the Subtropical Convergence (STC), at the Sub-Antarctic Front (SAF) and in the waters surrounding the Prince Edward Islands. In addition, a minor peak in chl-a concentration was recorded in the continental shelf waters. At stations where elevated chl-a concentrations were recorded, microphytoplankton generally formed a substantial contribution (-10%) to total chlorophyll. Outside these regions, total chlorophyll concentrations were lower (95% of the total. Microphytoplankton species composition along both transects were dominated by chain-forming species of the genera Chaetoceros (mainly C. neglectum, C. peruvianus and C. constrictus), Nitzschia spp. and Pseudoeunotia doliolus. Cluster and ordination analysis based on species composition identified five distinct microphytoplankton assemblages, which were closely associated with the different water masses in the region between Cape Town and the Prince Edward Islands. The microphytoplankton species composition and biogeographic zones identified during this investigation are in general agreement with similar studies conducted in the south-west Indian Ocean during the austral summer, which suggests that there are little seasonal trends in both the microphytoplankton species composition and biogeographic zonation

Population studies on pea cyst‐nematode Heterodera goettingiana Liebs.

RESP-515

Multinationals, international business, and poverty: A cross-disciplinary research overview and conceptual framework

This article examines the role of multinationals and international business in poverty alleviation, based on an analysis of articles in the top journals in business, economics, and policy. We develop a conceptual cross-disciplinary framework that maps and disentangles the impact of different types of international business activities on five dimensions of poverty, moderated by country and industry effects. While our study suggests that the impact of all the types of business activities on poverty is still unclear overall, we contribute to research and policy debates by identifying key insights from and main gaps in this cross-disciplinary stream of literature. A distinction is made between firm effects as part of both ‘mainstream’ and ‘responsible’ globalization, and firm-specific activities with and without the explicit goal of poverty alleviation, considering investment and trade. We propose areas for further research based on the framework, including the importance of interaction effects and contextual factors