Tahun Terbit

2010

Aquatic and terrestrial ecosystems are tightly linked through the fluxes of organisms and matter. However, aquatic and terrestrial ecologists have mainly studied these ecosystems separately, a “splendid isolation” historically fostered by disciplinary boundaries between institutes and funding schemes. Here, we synthesize the progress made in joint aquatic and terrestrial research and sugges…

Rates of glacier mass loss in the northern Pacific coastal temperate rainforest (PCTR) are among the highest on Earth, and changes in glacier volume and extent will affect the flow regime and chemistry of coastal rivers, as well as the nearshore marine ecosystem of the Gulf of Alaska. Here we synthesize physical, chemical and biological linkages that characterize the northern PCTR ecosystem, wi…

Islands make up 5.3% of Earth’s land area yet maintain an estimated 19% of bird species, 17% of rodents, 17% of flowering plants, and 27% of human languages. Species diversity is disproportionately threatened on islands in relation to the islands’ proportion of both global land area and species, with 61% of all extinct species and 37% of all critically endangered species confined to islands…

Central to the concept of coupled human and natural systems (CHANS), humans and nature are organized into interacting subsystems of a cohesive whole at multiple spatial and temporal scales. Following an overview of the challenges in implementing the CHANS concept, we used widely available measures of social, economic, and ecological systems, including gross domestic product, population size, ne…

We consider almost-primes of the form f(p) where f is an irreducible polynomial over Z and p runs over primes. We improve a result of Richert for polynomials of degree at least 3. In particular, we show that, when the degree is large, there are infinitely many primes p for which f(p) has at most deg f + O(log deg f) prime factors.

Tahun Terbit

2010

A guest-worker program can be a very flexible and convenient way of meeting labor shortages in a host country, assuming that the migrants adhere to the rules of the program. This article investigates the conditions under which guest workers have sufficient incentives for voluntary return to their country of origin when their work permits expire. Should they choose to overstay, the article exa…

This article argues that the most commonly used lesson plan pro formas in language teacher education are inappropriately premised on an outcomesbased approach to teaching, one that is in conflict with what we know about how languages are learnt and how experienced teachers teach. It proposes an alternative, affordance-based approach to lesson planning and makes a number of practical suggestions…

Tahun Terbit

2011