The giant tortoises of the Galápagos have become greatly depleted since European discovery of the islands in the 16th Century, with populations declining from an estimated 250 000 to between 8000 and 14 000 in the 1970s. Successful tortoise conservation efforts have focused on species recovery, but ecosystem conservation and restoration requires a better understanding of the wider ecological co...

1. Competition between livestock and wild ungulates is commonly perceived to occur on shared rangelands. In the Henry Mountains (HM) of Utah, a free-ranging population of bison Bison bison has raised concerns among ranchers holding grazing permits on these public lands. Bison are the most conspicuous potential competitors with cattle, but lagomorphs (mainly jackrabbits Lepus californicus) are a...

Invasive species threaten biological diversity throughout the world. Understanding the dynamics of their spread is critical to mitigating this threat. In Australia, efforts are underway to control the invasive cane toad (Chaunus [Bufo] marinus). Range models based on their native bioclimatic envelope suggest that the cane toad is nearing the end of its invasion phase. However, such models assum...

Species diversity has declined in ecosystems worldwide as a result of habitat fragmentation, eutrophication, and land-use change. If such decline is to be halted ecological mechanisms that restore or maintain biodiversity are needed. Two long-term field experiments were performed in native grassland to assess the effects of fire, nitrogen addition, and grazing or mowing on plant species diversi...

Prior to 2010, the introduced population of American bison (Bison bison) on Santa Catalina Island, California, was managed through the shipment of surplus bison to private ranches, Native American reservations, and livestock auctions on the mainland. In response to escalating costs, transport-induced stress to the animals, and ecologic impacts associated with high bison numbers on-island betwee...

The conservation of bison in Yellowstone National Park, from near extinction in the late 19th century to a recent high of 5000, has led to long-term societal conflict regarding perceived overabundance, transboundary movements, and potential transmission of brucellosis from bison to livestock. We synthesized available information to address two central questions in this debate: (1) has the Yello...

We analysed the possibility of reintroducing European bison (Bison bonasus L.) in north Romania—in Suceava, Neamț, and Maramureș counties—as well as increasing wild population Neamț county to improve genetic quality existing population. Currently, there is a over 50 individuals Vânători Natural Park, Romania. At same time, an attempt was made identify connecting corridors between free other pop...

An abstract is not available for this content. As you have access to content, full HTML content provided on page. A PDF of also in through the ‘Save PDF’ action button.

The Northern Region of the Forest Service, US. Department ofAgricdture, has developed an efficient and consistent method fbr assessing cumulative effects of management practices on the soil and vegetation maurces it manages. Ecological classification and analysis constitute the basis ofthis method Sirtoe many of the management activitks in the Regton alter the present oegetatian of a site (and ...

Abstract Supplementary feeding is a commonly used wildlife management practice, but while it may bring benefits and fulfil goals, can also result in unintended negative consequences. In the temperate zone, winter supplementary reduce movement of some ungulate species, leading to increased utilization sites by individuals and, consequently, animal aggregation. However, intensity site vary depend...