Habitat fragmentation affects movement behavior of migrating juvenile common toads

Displacement characteristics in animals are crucial drivers of successful movement decisions in resources acquisition, migration, and dispersal. As landscape structure is modified by human activity, mobility patterns are likely to evolve in response to habitat fragmentation. In species with complex life cycles that involve obligatory migrations between different habitats, one can predict that movement propensity would be promoted by fragmentation as long as it allows to reaching a habitat patch. Here, we compare the movement characteristics of naive toadlets sampled in populations distributed over a fragmentation gradient to test the hypothesis of a positive correlation between fragmentation and mobility levels. We studied toadlet movement in experimental arenas providing small patches of suitable conditions. We recorded the use of these patches (patch behavior) or the absence of their use (overtaking behavior). The more fragmented the original landscape, the more prone the toadlets were to combine these two behaviors, thus showing a higher motivation to explore. Moreover, the more fragmented the original landscape, the less the toadlets exhibited patch behavior. As the toadlets were reared in a common environment, the behavioral differences detected, relating to the level of fragmentation, resulted from inheritance. Our results thus illustrate that fragmentation is likely to create cross-generational transmittable variations in movement characteristics.     

Encouraging ‘Environmental Action’ by Exhortation: Evidence from a Study in Devon

National and local campaigns to encourage ‘Environmental Action’ use a range of media to increase the levels of activities such as recycling, energy saving and water conservation. These are conventionally focused on the population as a whole. The research reported in this paper suggests that such an approach, based on a belief that general campaigns are effective, might not be very effective and could be modified to take account of how different groups of people behave. In addition, the focus of campaigns on sectoral activities like water and energy saving might also be inappropriate given our findings, which are based on a survey of 1265 households in Devon. This found that three major types of behaviour characterise ‘Environmental Action’: purchasing, habitual activities and recycling behaviour. In addition, demographically and attitudinally defined clusters of individuals point to very different types of behaviour across the population. These findings suggest that more focused campaigns and a re-evaluation of how ‘Environmental Action’ is segmented would greatly assist policy makers in developing effective strategies for enhancing ‘Environmental Action’.     

Reasons for women's non-uptake of amniocentesis

More than 10 years after a chromosomal anomaly screening programme was set up in France for pregnant women of advanced age, amniocentesis is still a controversial issue. The reasons why eligible women did not utilize the test and whether or not the existence of social welfare coverage determined women's access to prenatal diagnosis were studied. A group of 291 women aged ⩾35 years who recently gave birth to normal liveborns was interviewed by telephone. Among those aged 38 years and over, who automatically qualified for social security coverage, 75 per cent had undergone amniocentesis as opposed to 23 per cent in the 35 to 37-year-old non-covered age group who did not qualify for social security coverage. In both groups, access to amniocentesis was found to depend on the physicians', women's and male partners' attitudes towards prenatal diagnosis and abortion. Among the younger group, the uptake depended mainly on socio-economic factors. Institutional policies should ensure greater equality of access while allowing for individual preferences.