How ecological research on human-dominated ecosystems incorporates agricultural and forestry practices: A literature analysis.

Understanding the nexus between practices and ecosystems is a critical challenge for sustainability, but it is unclear how ecological sciences have explored the question. To bring clarification, we conducted an analysis of ecology literature dealing with agricultural and forestry practices (AF practices), scanning a total of 27 556 references. Scientometric analyses showed that AF practices were addressed by 5.5% of ecology literature, and that this proportion increased from 2.5 to 8.1% between 1956 and 2017. Content analyses showed that research has mainly focused on monospecific systems in the Global North, predominantly using plot-level experimental approaches. Temporal monitoring, real-world practices and their social context were poorly investigated. This analysis stresses the need to reinforce research in complex agroecosystems, in particular in non-Western countries. Multilevel and spatio-temporal approaches, as well as participatory research, should also be encouraged to build a social-ecological understanding and formulate more grounded, relevant policy recommendations for sustainability.

Size-related consumption of Scirpus maritimus tubers by greylag geese Anser anser explained by their functional response.

To explain the preference of wintering greylag geese Anser anser for small Scirpus maritimus tubers (<10mm) over larger ones, our hypothesis was that the former would provide higher intake rates. This 'consumption rate hypothesis' was tested experimentally by deriving the functional responses of geese feeding on tubers of three contrasting sizes. Goose consumption rates were measured as: (i) feeding rate (tubers/min) and (ii) instantaneous intake rate (g fresh weight/min) on various tuber densities (5-200 tubers/tray). Geese had linear functional responses over the range of tuber densities offered, and tuber size affected their consumption rate. The results were then used to re-examine intake rates according to relative biomass of tubers found in the wild. In support of our hypothesis, the larger tubers allowed the lower intake rates. Foraging mechanisms that possibly control the tuber ingestion rate of geese were explored. After controlling (through chemical analyses) that nutritional components of tubers do not differ between sizes, it was concluded that geese preference is mainly due to size-related constraints (i.e. handling time) on their ingestion rates. Additional limiting factors (tuber extraction, digestion capacity) which are likely to constrain food intake of wild geese are also discussed.