Forbidden fruit: human settlement and abundant fruit create an ecological trap for an apex omnivore.

Habitat choice is an evolutionary product of animals experiencing increased fitness when preferentially occupying high-quality habitat. However, an ecological trap (ET) can occur when an animal is presented with novel conditions and the animal's assessment of habitat quality is poorly matched to its resulting fitness. We tested for an ET for grizzly (brown) bears using demographic and movement data collected in an area with rich food resources and concentrated human settlement. We derived measures of habitat attractiveness from occurrence models of bear food resources and estimated demographic parameters using DNA mark-recapture information collected over 8 years (2006-2013). We then paired this information with grizzly bear mortality records to investigate kill and movement rates. Our results demonstrate that a valley high in both berry resources and human density was more attractive than surrounding areas, and bears occupying this region faced 17% lower apparent survival. Despite lower fitness, we detected a net flow of bears into the ET, which contributed to a study-wide population decline. This work highlights the presence and pervasiveness of an ET for an apex omnivore that lacks the evolutionary cues, under human-induced rapid ecological change, to assess trade-offs between food resources and human-caused mortality, which results in maladaptive habitat selection.

Huckleberry Finn's Conscience: Reckoning with the Evasion.

Huck Finn's struggles with his conscience, as depicted in Mark Twain's famous novel The Adventures of Huckleberry Finn (AHF) (1884), have been much discussed by philosophers; and various philosophical lessons have been extracted from Twain's depiction of those struggles. Two of these philosophers stand out, in terms of influence: Jonathan Bennett and Nomy Arpaly. Here I argue that the lessons that Bennett and Arpaly draw are not supported by a careful reading of AHF. This becomes particularly apparent when we consider the final part of the book, commonly referred to, by literary scholars, as 'the evasion'. During the evasion Huck behaves in ways that are extremely difficult to reconcile with the interpretations of AHF offered by Bennett and Arpaly. I extract a different philosophical lesson from AHF than either Bennett or Arpaly, which makes sense of the presence of the evasion in AHF. This lesson concerns the importance of conscious moral deliberation for moral guidance and for overcoming wrongful moral assumptions. I rely on an interpretation of AHF that is influential in literary scholarship. On it the evasion is understood as an allegory about US race relations during the 20-year period from the end of the US Civil War to the publication of AHF.