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Some Icelandic killer whales have very high concentrations of polychlorinated biphenyls in their blubber, according to a new study.
But it seems that other orcas from the same population have levels of polychlorinated biphenyls (PCBs) that are much lower. It mainly depends on what they eat.
PCBs are industrial chemicals banned decades ago, after they were found to affect the health of both humans and wildlife. But because they degrade very slowly after being released in the environment, they still accumulate in the bodies of marine mammals.
After collecting skin and blubber biopsies from 50 orcas in Iceland, the researchers found considerable variation in contaminant concentrations and profiles across the population.
Image caption: These killer whales may appear healthy, but a new study has found extremely high levels of PCB contamination in some of the whales. There was a 300-fold difference between the levels of PCBs among the most contaminated orcas compared to the least contaminated ones. The variation was mainly due to their eating habits. CREDIT: Filipa Samarra - Icelandic Orca Project
A new study from McGill University suggests that some Icelandic killer whales have very high concentrations of PCBs (polychlorinated biphenyls) in their blubber. But it seems that other orcas from the same population have levels of PCBs that are much lower. It mainly depends on what they eat.
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UNIVERSITY PARK, Pa. Social media has become a platform for new mothers to openly share their experiences of the joys and challenges of parenthood. Researchers at Penn State and Dalhousie University have unraveled the sentiments in nursing mothers tweets to better understand the factors influencing breastfeeding behaviors. They hope the findings can inform policies and interventions to support and improve resources for nursing mothers, such as breastfeeding support, workplace accommodations and technological aids such as apps. We are getting the raw sentiment of nursing mothers without putting them in a controlled experiment environment where their views could become biased, said Richard Lomotey, assistant professor of information sciences and technology at Penn State Beaver. We are getting the real frustrations and joys experienced by these lactating mothers, which can help us to really explore the questions on the ground and the interventions that can be proposed t