Island in the Galápagos archipelago where goats have been removed.

<p>*Includes eradication efforts from 1999–2003; does not include prior control efforts.</p><p>Goats have been removed from over 700,00 ha for a cost of $12 million. Cost data for earlier eradications are not available. Goats have been reintroduced to islands nine times, which has cost more than$266,000 to remove those new populations. Goats remain on the three islands in bold, where removal efforts are underway. All costs are in 2009 US$.</p

The use of the threat of goat reintroduction to islands in the Galápagos as a political tool.

<p>A sign during a 2004 local protest at the Galápagos National Park headquarters, where local fishermen were demonstrating for additional fishing permits. The sign threatens to introduce goats to Fernandina Island, which is the only large island in the archipelago that does not have a history of introduced herbivores.</p

Southern Isabela is, separated from the northern section by a 10+ km-long lava isthmus (Perry Isthmus).

<p>A small town, Puerto Villamil, is located at the southern tip of the Island. a) The Galápagos archipelago. b) Isabela Island.</p

The marginal cost curve of removing goats from Santiago Island, Galápagos (2001–2006).

<p>The majority of the 79,569 goats removed cost between US$10–100 per goat to remove. The final goats, however, cost over$10,000 per goat. Technologies and tools targeted at cost-effectively removing the final animals of an eradication campaign could deliver in substantial savings to island restoration programs.</p

Disorder-Induced Magnetotransport Anomalies in Amorphous and Textured Co_1–<i>x</i>Si_<i>x</i> Semimetal Thin Films

In recent times the chiral semimetal cobalt monosilicide (CoSi) has emerged as a prototypical, nearly ideal topological conductor hosting giant, topologically protected Fermi arcs. Exotic topological quantum properties have already been identified in CoSi bulk single crystals. However, CoSi is also known for being prone to intrinsic disorder and inhomogeneities, which, despite topological protection, risk jeopardizing its topological transport features. Alternatively, topology may be stabilized by disorder, suggesting the tantalizing possibility of an amorphous variant of a topological metal, yet to be discovered. In this respect, understanding how microstructure and stoichiometry affect magnetotransport properties is of pivotal importance, particularly in case of low-dimensional CoSi thin films and devices. Here we comprehensively investigate the magnetotransport and magnetic properties of ≈25 nm Co1–xSix thin films grown on a MgO substrate with controlled film microstructure (amorphous vs textured) and chemical composition (0.40 x < 0.60). The resistivity of Co1–xSix thin films is nearly insensitive to the film microstructure and displays a progressive evolution from metallic-like (dρxx/dT > 0) to semiconducting-like (dρxx/dT < 0) regimes of conduction upon increasing the silicon content. A variety of anomalies in the magnetotransport properties, comprising for instance signatures consistent with quantum localization and electron–electron interactions, anomalous Hall and Kondo effects, and the occurrence of magnetic exchange interactions, are attributable to the prominent influence of intrinsic structural and chemical disorder. Our systematic survey brings to attention the complexity and the challenges involved in the prospective exploitation of the topological chiral semimetal CoSi in nanoscale thin films and devices