“When we got started, we didn’t know how the carcass of a 4-tonne elephant would impact its environment,” Thompson said. “Nothing of that magnitude had been studied in a terrestrial system.”<\/p>\n\n\n\n
“Surprisingly, we know more about the legacies of whale falls in the deep sea than we do about terrestrial megacarcasses,” the authors write. Yet living elephants push over trees, dig for water and, like a young Zambian bull tracked by GPS, can walk thousands of miles across southern Africa<\/a>.<\/p>\n\n\n\n The 40 carcass sites the team sampled ranged from 8 days to 7.7 years after death. “And the rangers have been instrumental, as they are the ones who keep records of elephant mortalities in the park and could direct us to carcasses of various ages,” said co-author Tercia Midzi, a senior manager in scientific services in Kruger National Park.<\/p>\n\n\n\n At each site, the researchers took soil and grass samples within 8 feet (2.5 meters) of the center and again 49 feet (15 meters) away, then counted plant species and scored how heavily the grass had been grazed.<\/p>\n\n\n\n Cameras at the sites caught elephants returning to move skulls around and even pulling out the rebar the team used as markers, according to Marquette University, where co-author Nathan Lemoine is an ecologist. “They really don’t like having their dead friends messed with,” Lemoine told Marquette Today<\/a> in 2025.<\/p>\n\n\n\n “At first, the elephant carcass just wipes out all the biomass at the center,” Reed said, “leaving these huge bare spots.” “It essentially resets the plant communities to zero,” Burkepile said.<\/p>\n\n\n\n On average, carcass soils held about 31 times more ammonium, 7 times more nitrate and 3 times more plant-available phosphorus than the savanna around them. “At really fresh carcass sites, soil nitrogen concentrations can be up to 3,000 times higher,” Reed said. “That’s just insane.”<\/p>\n\n\n\n “That amount of ammonium was not on my bingo card,” Midzi added.<\/p>\n\n\n\n Ammonium at those levels can be toxic to plants, so the nutrient pulse does not bring the grass back right away.<\/p>\n\n\n\n “Microbes at the elephant carcass, they’re sprinting,” Burkepile said. “Their metabolism’s cranking.” Soil respiration, a measure of how fast microbes break down organic matter, stayed high for about one to two years, but bacterial diversity dropped and had not recovered by the oldest sites.<\/p>\n\n\n\n The plants followed the same pattern. UC Santa Barbara says the team “once again saw a biodiversity coldspot dominated by just a handful of fast-growing species, a trend that persisted for at least 8 years after an elephant’s death.” A coldspot is a patch with unusually few species, the mirror image of a hotspot.<\/p>\n\n\n\n “My intuition was that, since the carcass was only physically present for a relatively short period, its effect would also be rather muted and transient,” said co-author Izak Smit, a senior scientist at South African National Parks. “However, a very different picture emerged when the lab results came back.”<\/p>\n\n\n\n The few grasses that take hold carry about 1.5 times more nitrogen. “It turns these grasses from watery iceberg lettuce into a juicy romaine,” Burkepile said. “Those plants are probably growing faster, but the herbivores are just mowing them down because they want to get at that nutrient-rich forage.”<\/p>\n\n\n\n Impala and buffalo, the most common visitors on camera, fed about three times more often on carcass sites. The authors write that the carcasses “potentially initiate a positive feedback cycle, similar to grazing lawns, where megacarcass sites become long-term hotspots of nutrient cycling and ecological activity,” with dung and urine keeping the soil rich.<\/p>\n\n\n\n “We found that even around eight years after an elephant had died, the ‘signal’ was still present in the soil and vegetation, and herbivores were still preferentially visiting those areas,” Smit said.<\/p>\n\n\n\n Smaller animals leave shorter marks. The paper cites earlier studies in which soils under roe deer carcasses matched untouched ground after about two years, and even bison, elk and moose carcasses left nutrient legacies lasting less than five years.<\/p>\n\n\n\n “If you want to enumerate the economic value of a living elephant, then it goes for far longer than the elephant is alive,” Lemoine said in 2025.<\/p>\n\n\n\n “Honestly, I was expecting it to operate really similarly to a whale fall,” Burkepile said. “You have this big pulse of nutrients that can create these unique islands of ecosystem processes and biodiversity.” Carcasses feed land too, as salmon that bears and eagles drag from Alaska’s streams feed the forest around them<\/a>.<\/p>\n\n\n\n “The deep sea is essentially a food desert,” he said. “It’s so low in nutrients, so low in energy that those whale carcasses attract organisms from all over.” Kruger is fertile by comparison, a point Lemoine made to Marquette Today in 2025. “When a whale falls, it’s the only thing there,” he said. “An elephant is dying in this bigger matrix of a grassland with resources and a healthy ecosystem around it.”<\/p>\n\n\n\n Losing animals breaks those links, much as rats that wiped out island seabirds rerouted the food chain on nearby coral reefs<\/a>. For elephants, the authors call it “a double jeopardy: Not only do we lose the living ecosystem engineers, but we also forfeit the prolonged ecological legacies created by their carcasses.”<\/p>\n\n\n\n The team compared carcasses of different ages instead of following one elephant from death to recovery, and the authors write that “a number of unmeasured factors such as elephant size and sex, rainfall differences, and scavenger density likely contributed to variation among sites.”<\/p>\n\n\n\n Kruger’s lions, hyenas and vultures also clean up fast. “Even for a huge animal like an elephant, the meat and the bones can disappear within a couple of weeks,” Burkepile said. In parks with fewer scavengers, the authors write, “we are likely significantly underestimating the strength and duration of the ecological legacies of megacarcasses.”<\/p>\n\n\n\n The team now plans to keep surveying the Kruger sites to build up what UC Santa Barbara calls “a time series of data for a longitudinal study,” and it is looking for collaborators elsewhere in sub-Saharan Africa to test whether wetter or drier places behave differently.<\/p>\n\n\n\n With about 30,000 elephants and roughly 600 deaths a year, more than one a day, the authors estimate that “at any one point in time there could be ~4,000 elephant carcasses in KNP that are influencing the ecology of this ecosystem.” Fenced plots that keep grazers off some sites should show how fast the plants recover, and the team hopes to publish those results in the coming year.<\/p>\n\n\n\nRangers led the way to 40 carcasses<\/h2>\n\n\n\n
![\"Ecologist](\"https:\/\/www.ecoticias.com\/en\/wp-content\/uploads\/2026\/10\/en-107-medio1-lemoine-fresh-elephant-carcass-transects.jpg\")
Too much nitrogen for plants<\/h2>\n\n\n\n
Busy microbes, fewer species<\/h2>\n\n\n\n
![\"Illustration](\"https:\/\/www.ecoticias.com\/en\/wp-content\/uploads\/2026\/10\/en-107-medio2-megacarcass-nutrient-cascade-graphic.jpg\")
Grazers keep coming back<\/h2>\n\n\n\n
Unlike a whale fall on the seafloor<\/h2>\n\n\n\n
What the study cannot yet say<\/h2>\n\n\n\n