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Moving in the Anthropocene
(2018)
Animal movement is fundamental for ecosystem functioning and species survival, yet the effects of the anthropogenic footprint on animal movements have not been estimated across species. Using a unique GPS-tracking database of 803 individuals across 57 species, we found that movements of mammals in areas with a comparatively high human footprint were on average one-half to one-third the extent of their movements in areas with a low human footprint. We attribute this reduction to behavioral changes of individual animals and to the exclusion of species with long-range movements from areas with higher human impact. Global loss of vagility alters a key ecological trait of animals that affects not only population persistence but also ecosystem processes such as predator-prey interactions, nutrient cycling, and disease transmission.
Microlensing is the only known direct method to measure the masses of stars that lack visible companions. In terms of microlensing observables, the mass is given by M (c(2)/4G)(r) over tilde (E)theta(E) and so requires the measurement of both the angular Einstein radius theta(E) and the projected Einstein radius (r) over tilde (E). Simultaneous measurement of these two parameters is extremely rare. Here we analyze OGLE-2003-BLG-238, a spectacularly bright (I-min 10.3), high-magnification (A(max) 170) microlensing event. Pronounced finite-source effects permit a measurement of theta(E) = 650 muas. Although the timescale of the event is only t(E) 38 days, one can still obtain weak constraints on the microlens parallax: 4.4 AU < <(r)over tilde>(E) < 18 AU at the 1 σ level. Together these two parameter measurements yield a range for the lens mass of 0.36 M-&ODOT; < M < 1.48 M-&ODOT;. As was the case for MACHO- LMC-5, the only other single star (apart from the Sun) whose mass has been determined from its gravitational effects, this estimate is rather crude. It does, however, demonstrate the viability of the technique. We also discuss future prospects for single-lens mass measurements
In der Literaturübersicht werden vier verhaltenstherapeutische Programme zur Behandlung schwerer Verhaltensstörungen wie Aggressionen, Selbstverletzung und exzessiven Stereotypien besprochen: Löschung, Ausschluß, Korrekturverfahren und Wutreduktion. Jedes Verfahren wird zunächst in seinen Grundkomponenten beschrieben. Dann wird die aus der Literatur erkennbare Effektivität besprochen und zwar für drei Bereiche: 1. die Beeinflussung des Problems in der therapeutischen Situation; 2. die Bedeutung der Behandlung für die Alltagssituation; 3. das Auftreten positiver oder negativer Veränderungen in anderen Verhaltensbereichen während der Therapie. Ein Vergleich der vier Therapien zeigt, daß noch wenig darüber bekannt ist, welche Therapiekomponenten in einzelnen Programmen wirksam sind und welche Therapieform am ehesten für spezifische Patienten geeignet ist. Abschließend wird diskutiert, wie eine gründlichere Dokumentation zur Klärung dieser Fragen beitragen könnte.