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Study Develops New Exam for Seals to Detect Mercury Exposure
Confirmed
In Short: Veterinarians and researchers have developed a specialized neurological examination protocol for Pacific harbor seal pups to detect early exposure to mercury, according to a study published in Frontiers in Veterinary Science.
Veterinarians and researchers have developed a specialized neurological examination protocol for Pacific harbor seal pups to detect early exposure to mercury, according to a study published in Frontiers in Veterinary Science.
The standard neurological examination, designed for land-based quadrupeds, is not suitable for seals. The new protocol includes using a 'fish-head-on-a-string' as a stimulus, which proved effective and appetizing for the pups.
Over two consecutive years, the team examined 45 stranded pups at a rehabilitation center. Mercury concentrations in the pups' lanugo, or hair grown in utero, were among the highest observed worldwide for young pinnipeds, with a geometric mean of 23.01 μg/g dw and a range of 8.03–63.09 μg/g dw.
These high mercury levels suggest that some pups may be at an elevated risk of sub-lethal adverse health effects. Mercury bioaccumulates in prey and is transferred to pups during gestation and lactation, linking them to contamination in mesopelagic food webs (200–1000 m depths).
The study's findings indicate that fetal exposure to mercury can put wild animals at risk for neurodevelopmental abnormalities. Mercury concentrations, however, showed no relationship with survival.
By developing a bespoke neurological examination protocol, researchers can identify pups with neurological dysfunction and pursue further diagnostic tests to identify the cause, such as intoxication, meningitis, or developmental problems.
Differences in ocean currents and environmental conditions can shape local food webs and prey composition, affecting the pups' exposure to contaminants.
The new exam protocol helps separate neurological disease from other problems that can cause similar signs, aiding in the identification and treatment of affected pups.
The study's findings raise concerns about the potential long-term health impacts of mercury exposure on marine wildlife.
What this adds
The study's case reports show how the new exam protocol can play out in practice, aiding in the identification and treatment of affected pups.
What's confirmed
- Veterinarians and researchers have developed a specialized neurological examination protocol for Pacific harbor seal pups to detect early exposure to mercury, according to a study published in Frontiers in Veterinary Science.
- The standard neurological examination, designed for land-based quadrupeds, is not suitable for seals. The new protocol includes using a 'fish-head-on-a-string' as a stimulus, which proved effective and appetizing for the pups.
- Over two consecutive years, the team examined 45 stranded pups at a rehabilitation center. Mercury concentrations in the pups' lanugo, or hair grown in utero, were among the highest observed worldwide for young pinnipeds, with a geometric mean of 23.01 μg/g dw and a range of 8.03–63.09 μg/g dw.
- These high mercury levels suggest that some pups may be at an elevated risk of sub-lethal adverse health effects. Mercury bioaccumulates in prey and is transferred to pups during gestation and lactation, linking them to contamination in mesopelagic food webs (200–1000 m depths).
- The study's findings indicate that fetal exposure to mercury can put wild animals at risk for neurodevelopmental abnormalities. Mercury concentrations, however, showed no relationship with survival.
- By developing a bespoke neurological examination protocol, researchers can identify pups with neurological dysfunction and pursue further diagnostic tests to identify the cause, such as intoxication, meningitis, or developmental problems.
- Differences in ocean currents and environmental conditions can shape local food webs and prey composition, affecting the pups' exposure to contaminants.
- The new exam protocol helps separate neurological disease from other problems that can cause similar signs, aiding in the identification and treatment of affected pups.
- The study's findings raise concerns about the potential long-term health impacts of mercury exposure on marine wildlife.
What's still developing
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