Life Lines by Dr. Dolittle

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Archive for June 2019

Dealing with the cold

Cold-tolerant insects have developed several strategies for dealing with cold temperatures. A new study published in the American Journal of Physiology – Regulatory, Integrative and Comparative Physiology explored how spotted wing drosophila (Drosophila suzukii), in particular, adapted physiologically to cold exposure. They discovered that animals adapted to living in the cold had altered the structure of their cellular membranes in ways that kept the membrane fluid and prevented it from becoming rigid. Moreover, […]

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Rising water temperatures masculinizes Nile tilapia

Nile tilapia, Oreochromis niloticus, is a species of freshwater fish native to Egypt and Africa. Global warming has the potential to significantly impact this species as water temperatures above 32 to 36.5 degrees Celsius can induce young fish (10-30 days after fertilization) that are genotypically female to become masculinized. Moreover, a recent study published in PLOS ONE showed that some young fish choose to visit warmer waters. A new study published […]

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Chronic stress impacts everyone around us

A new study examined how our stress impacts our best friend’s mental health.  The researchers studied Shetland sheepdogs, border collies and their owners and found that dogs living with people who had high levels of stress hormone (cortisol) in their hair follicles, similarly had high levels of cortisol in their fur. In contrast, canine anxiety does not appear to run off on people. That’s good news for those of us […]

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