Many Animals, Plants are Losing their Genetic Diversity, Becoming More Vulnerable

Researchers examined data for 628 species studied between 1985 and 2019. The greatest losses in genetic variation were seen in birds and mammals. - The AP
Researchers examined data for 628 species studied between 1985 and 2019. The greatest losses in genetic variation were seen in birds and mammals. - The AP
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Many Animals, Plants are Losing their Genetic Diversity, Becoming More Vulnerable

Researchers examined data for 628 species studied between 1985 and 2019. The greatest losses in genetic variation were seen in birds and mammals. - The AP
Researchers examined data for 628 species studied between 1985 and 2019. The greatest losses in genetic variation were seen in birds and mammals. - The AP

Two-thirds of animal and plant populations are declining in genetic diversity, which makes it harder to adapt to environmental changes, according to research published Wednesday.

Long before a species goes extinct, the population becomes smaller and more fragmented, shrinking the number of potential mates and therefore genetic mixing. This leaves a species more vulnerable to future threats such as disease.

“A surprisingly trend was that we saw genetic diversity declining even among” many species that aren’t considered at risk, said co-author Catherine Grueber, a conservation biologist at the University of Sydney, The Associated Press reported.

Researchers examined data for 628 species studied between 1985 and 2019. The greatest losses in genetic variation were seen in birds and mammals.

Findings were published in the journal Nature.

“When a species has different genetic solutions, it’s better able to deal with changes,” said David Nogués-Bravo at the University of Copenhagen, who was not involved in the study.

If a new disease spreads through a population or climate change alters summer rainfall, some individuals will fare better than others, in part because of their genes. Higher genetic diversity also means there’s a greater chance of a species’ survival.

Conservation efforts to connect isolated populations — basically expanding the dating pool for a particular species – can help maintain or even restore genetic diversity.

Florida panthers are an endangered species that have steadily lost habitat to freeways and urban sprawl. By the mid-1990s, the remaining big cats in southern Florida showed clear signs of inbreeding – with kinked tails and low sperm counts in males.

Biologists brought eight female panthers from Texas to Florida. Twenty years later, the number of Florida panthers in the wild has grown significantly and genetic diversity increased.

“Isolated populations suffer,” said Duke University ecologist Stuart Pimm, who was not part of the research. “The solution is to reconnect them.”



Santorini Seismic Activity Down But Schools Stay Shuttered

A tourist takes a photo at the village of Oia, as the seismic activity continues, on the island of Santorini, Greece, February 22, 2025. REUTERS/Nicolas Economou
A tourist takes a photo at the village of Oia, as the seismic activity continues, on the island of Santorini, Greece, February 22, 2025. REUTERS/Nicolas Economou
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Santorini Seismic Activity Down But Schools Stay Shuttered

A tourist takes a photo at the village of Oia, as the seismic activity continues, on the island of Santorini, Greece, February 22, 2025. REUTERS/Nicolas Economou
A tourist takes a photo at the village of Oia, as the seismic activity continues, on the island of Santorini, Greece, February 22, 2025. REUTERS/Nicolas Economou

Seismic activity on the Aegean Sea hotspot of Santorini has been "decreasing" over recent days but schools will remain closed for another week, according to authorities on the Greek island.

Thousands of earthquakes, mainly of a low magnitude, have been recorded between Santorini and Amorgos, islands in the Cyclades group southeast of the Greek mainland. They have yet to cause either casualties or significant damage but have worried authorities and residents.

"Seismic activity in the maritime region between Thira (Santorini) and Amorgos is decreasing," the ministry of civil protection said in a press release late Saturday following a meeting with the national commission of seismologists.

According to AFP, the ministry attributed the activity to a combination of tectonic movement and deep magmatic activity.

The region has not experienced a phenomenon of such magnitude since records began in 1964, experts say.

Located where the African and Anatolian tectonic plates converge, the Aegean Sea is often hit by earthquakes.

Known for its spectacular volcanic caldera, a large depression that forms when a volcano erupts and collapses, Santorini is also part of a volcanic arc with two underwater volcanoes near to its coast, Nea Kameni and Kolumbo, which last erupted in 1950 and 1650 respectively.

Authorities put the level of seismic activity inside the caldera as similar to recent days, noting a decrease in the rate of local ground deformation.

The ministry aid preventative measures would remain in force, urging residents to be alert to the risk of landslides.

Schools will meantime remain closed until Friday on Santorini and the nearby islands of Ios, Anafi and Amorgos while a ministerial assessment meeting will be held Thursday.

Authorities declared a state of emergency in Santorini and Amorgos at the start of February for a month, with schools closing while a majority of Santorini residents elected to leave the island, which saw 3.4 million visitors in 2023, leading to complaints of over-tourism.

Prime Minister Kyriakos Mitsotakis recently announced a support package for local businesses and workers on the island, one of Greece's most popular tourism destinations.