Detailed understanding of the mechanisms enabling or limiting impacts invasive generalist predators is needed. Harmonia axyridis an coccinellid predator that may have destabilised communities worldwide and excellent candidate for investigating invasion dynamics. We evaluated four hypotheses: (1) Nine years after being detected in Central Brazil, Ha. has dominated community. This facilitated by ...

The backyard is an agroecosystem located near the home and fulf ills several functions provides various services; in addition, one third of Rural Production Units Tlaxcala have this agroecosystem. In mexican state Tlaxcala, México, primary sector that contributes least to gross domestic product; it divided into 60 municipalities 66% its territory used for agricultural, livestock forestry activi...

The multifunctional diversity in agroecosystems must be studied from systemic and comprehensive approaches of non-parametric analysis. This article provides a new beta index biomathematical equations that quantify the agroecological entropy biodiversity. Ten were in: Boaco, Carazo, Chinandega, Estelí Matagalpa. Agroecosystem conventional versus agroecological. organisms captured at 25 points pe...

Environment pollution with ecotoxicants of natural and anthropogenic origin creates risks negative impact on the state environment, biota ecosystems, including humans. The study defnes main sources ecotoxic pollutants analyzes that may arise. Based ambiguity "risk" term defnition, interpretation is discussed. approach to defning risk as probability certain adverse events or processes taking int...