No abstract

Bushmeat consumption is affected by household wealth. However, how household wealth impacts bushmeat eaten in different environmental and social settings (i.e. whether urban, rural, coastal or forest) is poorly understood. In this study, we sampled households in six contrasting localities in Rio Muni, Equatorial Guinea, in coastal (Bata, Cogo), central (Niefang, Evinayong) and eastern parts of the territory (Ebebiyin, Nsork). On average, 32.3 g of bushmeat per adult male equivalent per day were consumed, though this varied widely between sites and most households ate no bushmeat on the survey day. Fish was the most frequently recorded source of protein and in a coastal site, Cogo, significantly more fish was consumed than in the other localities. Overall, average protein consumption was correlated with household wealth, but the strength of this effect varied among sites. At the site where average wealth was highest (Bata, the most urban site), bushmeat was more expensive, and wealthier households ate more of it. Elsewhere bushmeat consumption was not associated with wealth, and the cost of bushmeat was a higher proportion of household wealth. In Bata, wealthier households reported consumption of more than one meat type (most frequently bushmeat and either domestic meat or fish), and diversity of dietary items also increased with wealth. In all sites, wealthier households ate less fish. We demonstrate distinct differences in relationships between urban versus rural areas, and between coastal versus inland sites. We therefore caution that general patterns of wealth-wild meat consumption must be evaluated taking account the circumstances of wild meat consumers.

Most protein in sub-Saharan Africa comes from animal sources, a significant proportion of this from wild species or bushmeat. Availability of protein sources to human populations in Africa has not been studied before, perhaps because most population centres are too large for data collection to be practicable. Assessment of the availability and consumption of animal protein within the city of Malabo (c. 60 000 inhabitants), Bioko Island, Equatorial Guinea, included estimation of the annual animal protein supply to the city from daily counts of small livestock meats (goat, pork, lamb, duck, chicken), beef, fish and bushmeat (December 2003-March 2004) in the city's central market and other selling points, and the animal protein consumption per adult male equivalent (AME) derived from a sample of around 200 households to explore influence of household income on consumption of different protein sources. Current animal protein production (bushmeat, small livestock meats, beef and fish) in Bioko, and potential production needed to supply adequate amounts of protein to the people of Malabo in the future were calculated. Annually around 2100 t of meat/fish (460 t of animal protein) was available, of which only 7% was produced on the island. Consumption patterns indicated that largersized households purchased more meat, but protein intake per AME fell significantly with household size. Income was positively correlated with volume of small livestock meats consumed per household, but negatively related with bushmeat eaten. Income did not influence beef or fish consumption per household. Although the island is capable of producing more alternative meats, it cannot sustain itself on local production and will therefore continue to be dependent on importing a large proportion of meat (and protein). There is no dependency on bushmeat species, but current rates of wild species use can still have a dramatic impact on wildlife populations on the island if left unabated. Alternative ways of ensuring sufficient protein supply for the Malabo population are crucial

No abstract

Methane (CH 4 ) is a strong greenhouse gas known to have perturbed global climate in the past, especially when released in large quantities over short time periods from continental or marine sources. It is therefore crucial to understand and, if possible, quantify the individual and combined response of these variable methane sources to natural climate variability. However, past changes in the stability of greenhouse gas reservoirs remain uncertain and poorly constrained by geological evidence. Here, we present a record from the Congo fan of a highly specific bacteriohopanepolyol (BHP) biomarker for aerobic methane oxidation (AMO), 35-aminobacteriohopane-30,31,32,33,34-pentol (aminopentol), that identifies discrete periods of increased AMO as far back as 1.2 Ma. Fluctuations in the concentration of aminopentol, and other 35-aminoBHPs, follow a pattern that correlates with late Quaternary glacial-interglacial climate cycles, with highest concentrations during warm periods. We discuss possible sources of aminopentol, and the methane consumed by the precursor methanotrophs, within the context of the Congo River setting, including supply of methane oxidation markers from terrestrial watersheds and/or marine sources (gas hydrate and/or deep subsurface gas reservoir). Compound-specific carbon isotope values of À30& to À40& for BHPs in ODP 1075 and strong similarities between the BHP signature of the core and surface sediments from the Congo estuary and floodplain wetlands from the interior of the Congo River Basin, support a methanotrophic and likely terrigenous origin of the 35-aminoBHPs found in the fan sediments. This new evidence supports a causal connection between marine sediment BHP records of tropical deep sea fans and wetland settings in the feeding river catchments, and thus tropical continental hydrology. Further research is needed to better constrain the different sources and pathways of methane emission. However, this study identifies the large potential of aminoBHPs, in particular aminopentol, to trace and, once better calibrated and understood, quantify past methane sources and fluxes from terrestrial and potentially also marine sources.