“Cetacean populations remain stable in the Mediterranean”

After stranding, this Tuesday, a Cuvier-beaked whale on a beach in Sant Lucy de Porto-Vecchio, the zoologist and president of Cary (The Whale Island Research Society) discusses the status of the various species, all of which are protected

Last Tuesday, Cuvier’s six-meter-long beaked whale and one ton were found stranded on a beach in Sant Lucy de Porto-Vecchio. The information was relayed quickly in various national media while cetacean and president of the Carrie (Cetacean Island Research Society), Cathy Cesarini, went the next morning to the scene to sample an adult male. “An autopsy does not necessarily aim to establish the cause of death, because after the animal has been drifting for days or even weeks at sea, this is simply not possible, The Corsican reference identifies the National Cotton Network (RNE), which was founded forty years ago and placed under the supervision of the Ministry of the Environment. During each braiding, it’s about collecting data in order to look for heavy metal levels, determine the diet and learn more, in general, about the biology of the species and the quality of the marine environment.

If the animal – in fact a dolphin, as its name does not indicate – has a lung anomaly, its severing is not unusual in the eyes of scientists. “This type of cetacean, which dives to a depth of 1,500 metres, is one of the least observed species, Cathy Cesarini confirms. This is the fourth land base on the island’s coast since the beginning of the year. However, grounding is not a rare or abnormal phenomenon. There are fifteen to twenty years on thousands of kilometers of the Corsican coast, and all cetaceans combined, knowing that the vast majority of individuals who die at sea disappear far from shore.

At the head of the Carrie Society, which she founded in 2005, is a zoologist, which provides “continuous monitoring”No worrying changes have been observed in this data over the past thirty years. Just as I noticed “More” Of the whales in the marine sector surrounding Corsica, belonging to the Pelagos Reserve (area for the protection of marine mammals).

In the Mediterranean, seven species of cetaceans are listed, all protected, namely: the striped dolphin (the most numerous, which can be observed during the crossing of ferries), the common dolphin, the bottlenose dolphin, the Risso dolphin, the pilot whale, the sperm whale and the whale fin. According to the world, “Between 200 and 250 people” Move around the island.

work identification

But conducting a census is not easy due to several factors. “Identification work, which includes photographing the dorsal fins (which makes it possible to distinguish individuals, somewhat like fingerprints), is voluntary, depending on weather conditions and the financial means we have for cruises. says Cathy Cesarini. The research programs implemented in this framework remain dedicated.”

By their social nature, each cetacean species has its own evolution. “Groups spend part of their lives together, and after about ten years, they separate and change places to ensure mingling, world confirms. Blue dolphins, for example, can form groups of 80 to 200 individuals, but nothing is constant. We mainly study the bottlenose dolphin, which is sometimes found near the coast, dives to a depth of 80 meters and supports interactions with humans fairly well. We don’t necessarily have to go far from shore because notes are more related to underwater engravings. The sperm whale or whale, for example, can develop at a depth of 800 meters, knowing that some bays of the island harbor large valleys, the depth of which can reach 1000 meters.

Currently, despite threats to the environment and discharges into the sea that affect biodiversity, the situation of cetaceans remains relatively “balanced”. “This resource stabilizes the population, but in the long run, its scarcity can already have an impact on numbers, Cathy Cesarini notes. In terms of global warming, a decrease in phytoplankton blooms, a food for whales, will also have impacts on wild species.

Noise pollution from human activities can also have significant impacts on cetaceans. “Noise travels underwater much faster than air and marine animals they encounter adapt to move away, Continue to cetologist. This is especially noticeable during the summer, with increased marine activities. Sounds propagated by submarines or sonar can also be responsible for damage to the inner ear, insofar as they disturb animals and force them to ascend very quickly from great depths.

In addition to heavy metals and epidemics that have multiplied in recent years, plastic also presents pollution that is particularly harmful to sea turtles, which are also the subject of concern for the Carey Society. Which carries the project of establishing a dedicated care center for these threatened and vulnerable species due to fishing and yachting.

Facebook: Cetacean Island Research Society – CARI.

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