NDF Workshop Case Studies WG 1 – Trees: Non-detriment Findings Report On Guaiacum Sanctum In Mexico
G. sanctum has been considered a threatened species in Mexico since 1994 (NOM-059-SEMARNAT-2001), specifically in the “Species under special protection” category.
The main threats for Guaiacum sanctum in Mexico are HABITAT LOSS/DEGRADATION OF HABITAT provoked by human activities, espe- cially the conversion from forest to agriculture-pasture lands and human settlements. OVERHARVESTING of Guaiacum sanctum has reduced its abundan- ce in some areas, but currently does not represent a threatening factor. Local use of the species is present in some communities, but at very low levels and we do not consider this a threat for the long-term per- sistence of the species
In Central America and Florida remaining populations are threatened with habitat loss or exploitation, e.g., in Guancaste in Costa Rica, El Salvador, Florida Keys. As with G. officinale, both the timber and medicinal resin are of commercial use and have been traded for several centuries. Tropical semi-deciduous and dry forests, which represent the main habitats of Guaiacum sanctum are among the most threatened ecosystems in the Americas and globally (Miles et al. 2006). Habitat loss of G. sanctum is mainly due to deforestation associated with increasing human populations, conversion of forest to human-managed areas, and increasing fragmentation of the remaining forest area (López‐Toledo et al. 2011, Miles et al. 2006). For Mexico, analyses of the geographic distribution suggested that their habitat is highly fragmented. It is likely that small, isolated populations close to the margins of the species’ distributions are likely to be particularly vulnerable to the negative demographic and genetic effects of forest fragmentation. Although, it still exists an international trade, this has diminished noticeably. At the moment, Mexico is the only exporter of Guaiacum sanctum timber and it is only logged at Campeche state in the Yucatan Peninsula at two localities. These two forest communities fulfill with CITES requirements. The species is used locally for timber but at low levels and this is not a long term threat to the species (López-Toledo et al. 2008). The illegal trade of this species is also rare, with only a small amount being confiscated from Yucatan in 2008. Hence, logging and over harvesting is currently considered a low threat to the species.
Generally, only the main log of a given tree (4-5 m) is extracted, leaving the rest of the stem and branches in the forest as these are not useful to the timber industry.
G. sanctum has historically been heavily exploited for its medicinal properties, especially for the treatment of syphilis and arthritis; It was also used as a laxative, anti-inflammatory, diuretic, and diaphoretic. Currently the more important trade is for timber products. The high density and resin content of the wood confer auto-lubricating properties that make it suitable for the ship-building industry
In general, illegal logging for commercial pur- poses is rare, but its effects cannot be discounted. For example, in September 2008 a small amount of G. sanctum timber was confiscated in a small community of Yucatan, near Merida (Dzitia), because of lack of authorization for harvesting.
Although there are no estimates of the extent of illegal logging for inter- national trade, it is likely to be very low or non-existent given the reduction of G. sanctum’s use
This study found that logging reduced stem den- sity and residual tree basal area at a local scale, but our study suggests that harvesting of G. sanctum had only minor short-term effects on the dynamics and regeneration of the tree community. Guaiacum sanctum seedling abundance and rates of growth, mortality and recruitment were sensitive to the effects of harvesting, but the demo- graphic attributes of adults were unaffected by logging.
López-Toledo, L., Burslem, D., Martínez-Ramos, M., García-Naranjo, A. (n.d.) NDF Workshop Case Studies WG 1 – Trees: Non-detriment Findings Report On Guaiacum Sanctum In Mexico