New! Sign up for our free email newsletter.
Science News
from research organizations

The fauna in the Antarctica is threatened by pathogens humans spread in polar latitudes

When the human species infects other living beings

Date:
December 10, 2018
Source:
University of Barcelona
Summary:
The fauna in the Antarctica could be in danger due the pathogens humans spread in places and research stations in the southern ocean.
Share:
FULL STORY

The new study, which detected bacteria from humans in the genus Salmonella and Campylobacter in Antarctic and Subantarctic marine birds, reveals the fragility of polar ecosystems and warns about the risk of massive deaths and extinctions of local fauna populations due pathogens.

Reverse zoonosis: when the human species infects other living beings

Explorers, whalers, scientists -and lately, tourists-, are examples of human collectives that moved to the furthest regions of the planet. Some studies have claimed for years that there had been cases of reverse zoonosis, that is, infections humans give to other living beings. Despite some previous signs, scientific studies on zoonotic agents in the Antarctic and Subantarctic areas have been fragmented. Therefore, evidence is spread and not completely convincing in this field.

The new study, published in the journal Science of the Total Environment, studies the potential transmission of bacteria from humans to marine bird populations in four areas of the Antarctic and Subantarctic ecosystems. "Chronology and potential pathways for reverse zoonosis in these ecosystems are complex and difficult to study, but it seems they can be clearly related to the proximity of the fauna to inhabited areas and the presence of research stations," says Professor Jacob González-Solís, from the Department of Evolutionary Biology, Ecology and Environmental Sciences of the UB and IRBio.

Antibiotic-resistant bacteria in polar ecosystems

The study confirms the first evidence of reverse zoonosis related to the presence of human-origin bacteria Salmonella and Campylobacter in polar fauna. One of the warning signs was, in particular, the identification of Campylobacter strains, which are resistant to ciprofloxacin and enrofloxacin (common antibiotics in medicine and veterinary).

"Finding common Campylobacter genotypes in human species or livestock was the definite hint to prove that humans can be introducing pathogens in these regions," says Marta Cerdà-Cuéllar, researcher at the IRTA-CReSA. "These Salmonella and Campylobacter strains, which are a common cause for infections in humans and livestock, do not usually cause death outbreaks in wild animals. However, the emerging or invasive pathogens that arrive to highly sensitive populations -such as the Antarctic and Subantarctic fauna- could have severe consequences and cause the local collapse and extinction of some populations."

Northen and Southern Hemisphere: migrating route for marine birds and pathogens

The study shows the risk of reverse zoonosis is higher in areas that are closer to inhabited areas, such as the Falkland Islands, and probably the Tristan da Cunha archipelago. In this situation, the biological connectivity between Antarctic and Subantarctic communities through marine birds is a factor that would speed up the circulation of zoonotic agents among the ecosystems from different latitudes.

"This could be the case, for instance, of the Subantarctic parasite Stercorarius antarcticus: a scavenger marine bird could get the pathogen and spread it from Subantarctic latitudes to the Antarctica," says González-Solís.

Polar areas: not all the biodiversity is protected

The Antarctic Treaty protocol on Environmental Protection sets a series of principles that can be applied to human activity in Antarctica to reduce the human footprint in the white continent. However, some Subantarctic areas -which are also the habitat of birds such as the brown skua or the giant petrel- are not protected by the protecting regulation and could become the entrance for pathogen agents in polar ecosystems.

"Our results show it is easier for humans to introduce pathogen agents in the pristine areas in the Antarctica. As a result, pathogens entering the furthest ecosystems in the Southern Hemisphere could be a serious threat for the future of wildlife. Therefore, it is essential to adopt biosecurity measures to limit the human impacts in the Antarctica," notes Jacob González-Solís.


Story Source:

Materials provided by University of Barcelona. Note: Content may be edited for style and length.


Journal Reference:

  1. Marta Cerdà-Cuéllar, Elisabet Moré, Teresa Ayats, Mònica Aguilera, Sara Muñoz-González, Noelia Antilles, Peter G. Ryan, Jacob González-Solís. Do humans spread zoonotic enteric bacteria in Antarctica? Science of The Total Environment, 2019; 654: 190 DOI: 10.1016/j.scitotenv.2018.10.272

Cite This Page:

University of Barcelona. "The fauna in the Antarctica is threatened by pathogens humans spread in polar latitudes." ScienceDaily. ScienceDaily, 10 December 2018. <www.sciencedaily.com/releases/2018/12/181210101920.htm>.
University of Barcelona. (2018, December 10). The fauna in the Antarctica is threatened by pathogens humans spread in polar latitudes. ScienceDaily. Retrieved March 18, 2024 from www.sciencedaily.com/releases/2018/12/181210101920.htm
University of Barcelona. "The fauna in the Antarctica is threatened by pathogens humans spread in polar latitudes." ScienceDaily. www.sciencedaily.com/releases/2018/12/181210101920.htm (accessed March 18, 2024).

Explore More

from ScienceDaily

RELATED STORIES