Browsing by Author "Lamont, T"

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    Biological survey of the Prince Edward Islands, December 2008
    (2009) Cooper, J; Bester, M N; Chown, S L; Crawford, R J M; Daly, R; Heynse, E; Lamont, T; Ryan, P G; Shaw, J D
    A biological survey of the Prince Edward Islands took place in December 2008. The survey repeated an earlier survey of the populations of surface-nesting seabirds on both islands and of fur seals (Arctocephalus spp.) and alien plants on Prince Edward Island in December 2001. Observations on burrowing seabirds, macro-invertebrates and plant communities on Prince Edward Island and an oceanographic survey of surrounding waters were also included. The survey confirmed many of the observations made on the earlier survey and permitted an assessment of trends in the abundance and distribution of biota since 2001.
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    Primary production in the Benguela ecosystem, 1999–2002
    (2009) Barlow, R; Lamont, T; Mitchell-Innes, B; Lucas, M; Thomalla, S
    Phytoplankton production was investigated throughout the whole Benguela ecosystem in winter 1999 and in summer 2002 during two four-week research cruises from Cape Town, South Africa, through Namibian waters to Namibe in southern Angola. Primary production ranged from 0.14–2.26 g C m−2 d−1 during June–July 1999 and from 0.39–8.83 g C m−2 d−1 during February–March 2002. Mean productivity values indicated that the Benguela ecosystem was twice as productive in summer than in winter. In 1999, most of the productivity occurred within a temperature range of 13.5–18 °C, whereas in 2002 elevated production was associated with temperatures of 14–22 °C. The relationship between primary production and chlorophyll a was good for winter 1999 but poor for summer 2002, suggesting that predicting primary production from chlorophyll a is not straightforward for the Benguela ecosystem.