And for those such as myself that find the mass collection study interesting as a research basis...
Fun read if this fits your fancy.
"While many recent ecological studies have shown or hypothesized the importance of large animals in ecosystems, according to senior author Jens-Christian Svenning, the meta-analytical study is an important step forward by synthesizing direct experimental and semi-experimental evidence from across the globe to assess the generality of these effects quantitatively."
Fun read if this fits your fancy.

Megafauna Impact Theory: A Paradigm Shift in Ecosystem Dynamics
A new meta-analysis across six continents establishes that large wild herbivores affect ecosystems in numerous important ways, from soils to vegetation to smaller animals, and promote ecosystem variability. For millions of years, a variety of large herbivores, or megafauna, influenced terrestrial
scitechdaily.com
"While many recent ecological studies have shown or hypothesized the importance of large animals in ecosystems, according to senior author Jens-Christian Svenning, the meta-analytical study is an important step forward by synthesizing direct experimental and semi-experimental evidence from across the globe to assess the generality of these effects quantitatively."