Assessing the recovery of an Antarctic predator from historical exploitation

The recovery of whale populations from centuries of exploitation will have important management and ecological implications due to greater exposure to anthropogenic activities and increasing prey consumption. Here, a Bayesian population model integrates catch data, estimates of abundance, and information on genetics and biology to assess the recovery of western South Atlantic (WSA) humpback whales (Megaptera novaeangliae). Modelling scenarios evaluated the sensitivity of model outputs resulting from the use of different data, different model assumptions and uncertainty in catch allocation and in accounting for whales killed but not landed. A long period of exploitation drove WSA humpback whales to the brink of extinction. They declined from nearly 27 000 (95% PI = 22 800–33 000) individuals in 1830 to only 450 (95% PI = 200–1400) whales in the mid-1950s. Protection led to a strong recovery and the current population is estimated to be at 93% (95% PI = 73–100%) of its pre-exploitation size. The recovery of WSA humpback whales may result in large removals of their primary prey, the Antarctic krill (Euphausia superba), and has the potential to modify the community structure in their feeding grounds. Continued monitoring is needed to understand how these whales will respond to modern threats and to climate-driven changes to their habitats

Increased competition and diversity in higher education: an empirical analysis of the Italian university system

Increasing diversity is often advocated as an effective strategy through which higher education systems can cope with the new functions that they are required to perform, and respond to the varied demands that they face from an increasing and more diverse set of stakeholders. Such diversity is sometimes considered as the ‘natural’ outcome of intensified competition among institutions. Using Italian data relative to the period 1999/2000–2005/2006, and focusing on one specific dimension of diversity — the universities’ horizontal differentiation in terms of disciplines taught — the paper shows empirically how the introduction of measures directed at strengthening competition in higher education can actually contribute to a reduction in the system's overall diversity, as universities attempt to boost enrolments by increasing their specialization in more popular disciplines. The diversity-enhancing property of increased competition should not therefore be taken for granted, even with respect to other features of higher education systems