Our study examines the effect of seasonal rains on soil organic C dynamics in a tropical deciduous forest ecosystem in Western Mexico. At the end of the wet season, an accumulation of labile nutrient forms developed and was maintained during the dry season. This accumulation enhances microbial activity in the first rains of the wet season. For example, the litter samples of the dry season had a higher C and N mineralization than those of the wet season. Similarly, the January soil samples had higher C mineralization than October soil samples (55 and 34 μg C g-1 d-1, respectively). These results suggest that the quality of C is strongly affected by the seasonality of rains, which in turn influences microbial activity. This seasonality also influences nutrient redistribution between soil aggregate fractions. Chemical changes across seasons suggest that soil organic matter associated with macro-aggregates represents the main source of energy for microbial activity at the beginning of the wet season, while micro-aggregates protect the labile nutrient forms during the growing season.

Conservation conflicts can arise in biosphere reserves when local people face restrictions on resource use and access, mainly in terms of subsistence. We studied the potential conservation conflict with subsistence hunting in two Maya communities (Los Petenes and El Remate) located in the zone of influence of Los Petenes Biosphere Reserve, Mexico. Perceptions, interests and expectations of stakeholders regarding subsistence hunting in the reserve were recorded through semi-structured and in-depth interviews of peasant-hunters and reserve authorities, and participant observation was carried out in both communities. A total of 66 peasant-hunters were identified in Los Petenes (62%) and El Remate (38%). Overall, peasant-hunters acknowledged hunting for family subsistence and expressed the conviction to continue hunting in the region. They mentioned their enthusiasm for hunting, mainly individually and aimed at obtaining white-tailed deer (Odocoileus virginianus) and perceived a recent reduction in potential prey locally. Although the law in Mexico does not prohibit subsistence hunting, external authorities stated that they have announced a generalized ban on hunting based on the precautionary principle to simplify enforcement both inside and outside the reserve. The de facto restriction on wildlife use, even for subsistence purposes, which was mentioned by external actors, conflicted with the local need and expectation of the contemporary Maya hunters to continue subsistence hunting in the region. Our study confirms the existence of a conservation conflict associated with this traditional practice in the reserve and provides necessary information for managing such conflict.

Conflicts are an inherent element in the establishment and management of protected areas. Even though there is ample literature about conflicts in protected areas and the field of conservation has investigated them for decades, no consensus exists about the object itself of analysis: the conflict. In this article, we describe three different approaches for understanding socio-environmental conflicts, and we illustrate them with cases from protected areas in Mexico. The principal objective of the article is to advance discussions about the importance of understanding the implications of the use of different approaches on socio-environmental conflicts, in the interest of providing elements to take better decisions about the management of the protected areas.

Summary -Seasonal trends in littertall and potential mineral return were studied in two cork-oak forest sites in the northeastern Iberian peninsula. The estimated average litter production was 3.9Mg.ha -1 .year -1 for one site and 4.6 Mg.ha -1 .year -1 for the other; these figures are similar to those reported for holm-oak (Quercus ilex) forests in the same area. Seasonal litterfall patterns were typical of Mediterranean forest ecosystems. Leaves accounted for 46 to 78% of the total dry matter. Their annual weighted-average mineral composition was low in macronutrients (N 8-9; K 4-5; Mg 0.8-1.3; Ca 9-10 and P 0.4-1 mg.g -1 ) and relatively high in micronutrients such as Mn (2-2.2 mg.g -1 ) or Fe (0.3-0.4 mg.g -1 ). Minimum N and P concentrations were found during the growth period. Estimates of potential mineral return for an annual cycle were N 38-52, P 2.

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Management strategies for biosphere reserves need to be locally linked, acknowledging the interests and expectations of local stakeholders, as their participation is crucial for effective resource conservation, particularly in the case of subsistence resource management. In this paper we present a novel qualitative analysis tool, called a linkage matrix, for evaluating the social linkage of biosphere reserve management instruments. As a case study we considered wildlife use for subsistence purposes in the context of Los Petenes Biosphere Reserve (LPBR), located in the northwest of the Yucatan Peninsula, Mexico. Based on official and ethnographic data on traditional wildlife use in two Maya communities neighboring the reserve, we documented its Management Program's degree of social linkage, and identified actions to improve its implementation in the zone of influence of the protected area. Based on the linkage matrix, the reserve Management Program was found to be highly inclusive, taking into account 64% of the interests and expectations identified by local peasant-hunters regarding wildlife. Nevertheless, marked deficiencies were identified in the implementation of the reserve's management instrument, which limited the effectiveness of the protected area for conservation. The linkage matrix enabled the identification of possible lines of action for improving both the specific content of the Management Program and its implementation regarding wildlife use. Based on a) the results of the linkage matrix in LPBR, b) the objectives of biosphere reserves aimed at conservation and development, and c) the requirement for biosphere reserves to implement an official management instrument, we highlight the scope of applicability and the contribution of our analysis tool, which offers a means for approaching the social linkage of biosphere reserves not only in Mesoamerica but around the world.

Summary To manage widespread conservation conflicts, building a shared understanding among the parties involved has been considered key. However, there is little empirical evidence of the role this understanding might play in the context of imposed biosphere reserves. Using semi-structured and in-depth interviews in two communities within the Calakmul Biosphere Reserve, we explored whether or not there is a shared understanding of conflicts between local people and reserve managers, and we analysed its contribution to conflict management. We found that a shared understanding is not a determining factor when the conflict solution demands actions that exceed stakeholders’ functions. While a shared understanding helps with the global process of conflict management, there are other challenges: local impairment resulting from the exclusionary creation and the operation of protected areas and the need for action to solve a conflict that exceeds the functions of stakeholders.

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