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This study considers children's informal musicking and online music teaching, learning, playing, and invention through an analysis of children's clapping games on YouTube. We examined a body of 184 games from 103 separate YouTube postings drawn from North America, Central and South America, Europe, Africa, Asia, Australia, and New Zealand. Selected videos were analyzed according to video characteristics, participant attributes, purpose, and teaching and learning aspects. The results of this investigation indicated that pairs of little girls aged 3 to 12 constituted a majority of the participants in these videos, with other participant subcategories including mixed gender, teen, adult, and intergenerational examples. Seventy-one percent of the videos depicted playing episodes, and 40% were intended for pedagogical purposes; however, several categories overlapped. As of June 1, 2016, nearly 50 million individuals had viewed these YouTube postings.

Disturbance is a crucial determinant of animal abundance, distribution and community structure in many ecosystems, but the ways in which multiple disturbance types interact remain poorly understood. The effects of multiple-disturbance interactions can be additive, subadditive or super-additive (synergistic). Synergistic effects in particular can accelerate ecological change; thus, characterizing such synergies, the conditions under which they arise, and how long they persist has been identified as a major goal of ecology., We factorially manipulated two principal sources of disturbance in African savannas, fire and elephants, and measured their independent and interactive effects on the numerically dominant vertebrate (the arboreal gekkonid lizard Lygodactylus keniensis) and invertebrate (a guild of symbiotic Acacia ants) animal species in a semi-arid Kenyan savanna., Elephant exclusion alone (minus fire) had negligible effects on gecko density. Fire alone (minus elephants) had negligible effects on gecko density after 4 months, but increased gecko density twofold after 16 months, likely because the decay of fire-damaged woody biomass created refuges and nest sites for geckos. In the presence of elephants, fire increased gecko density nearly threefold within 4 months of the experimental burn; this occurred because fire increased the incidence of elephant damage to trees, which in turn improved microhabitat quality for geckos. However, this synergistic positive effect of fire and elephants attenuated over the ensuing year, such that only the main effect of fire was evident after 16 months., Fire also altered the structure of symbiotic plant-ant assemblages occupying the dominant tree species ( Acacia drepanolobium); this influenced gecko habitat selection but did not explain the synergistic effect of fire and elephants. However, fire-driven shifts in plant-ant occupancy may have indirectly mediated this effect by increasing trees' susceptibility to elephant damage., Our findings confirm the importance of fire × elephant interactions in structuring arboreal wildlife populations. Where habitat modification by megaherbivores facilitates co-occurring species, fire may amplify these effects in the short term by increasing the frequency or intensity of herbivory, leading to synergy. In the longer term, tree mortality due to both top kill by fire and toppling by large herbivores may reduce overall microhabitat availability, eliminating the synergy. [ABSTRACT FROM AUTHOR]