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2017 ; 284
(1854
): ä Nephropedia Template TP
gab.com Text
Twit Text FOAVip
Twit Text #
English Wikipedia
Removal of an apex predator initiates a trophic cascade that extends from
herbivores to vegetation and the soil nutrient pool
#MMPMID28490624
Morris T
; Letnic M
Proc Biol Sci
2017[May]; 284
(1854
): ä PMID28490624
show ga
It is widely assumed that organisms at low trophic levels, particularly microbes
and plants, are essential to basic services in ecosystems, such as nutrient
cycling. In theory, apex predators' effects on ecosystems could extend to
nutrient cycling and the soil nutrient pool by influencing the intensity and
spatial organization of herbivory. Here, we take advantage of a long-term
manipulation of dingo abundance across Australia's dingo-proof fence in the
Strzelecki Desert to investigate the effects that removal of an apex predator has
on herbivore abundance, vegetation and the soil nutrient pool. Results showed
that kangaroos were more abundant where dingoes were rare, and effects of
kangaroo exclusion on vegetation, and total carbon, total nitrogen and available
phosphorus in the soil were marked where dingoes were rare, but negligible where
dingoes were common. By showing that a trophic cascade resulting from an apex
predator's lethal effects on herbivores extends to the soil nutrient pool, we
demonstrate a hitherto unappreciated pathway via which predators can influence
nutrient dynamics. A key implication of our study is the vast spatial scale
across which apex predators' effects on herbivore populations operate and, in
turn, effects on the soil nutrient pool and ecosystem productivity could become
manifest.