Caring for offspring is unequal between the sexes in many animal species and a new study suggests evolution is the culprit.
Making babies is one of the fundamental conflicts of interest between the sexes. Care by either partner is beneficial to both partners as it increases the health and survival prospects of the common young, while providing care is costly only to the caring individual. As a result, each partner does best in a situation where most of the care is provided by the other partner--an outcome that is clearly impossible.
A fossil discovery has provided a missing link that helps to resolve a more than 5-million-year gap in fur seal and sea lion evolutionary history.
This new genus and species of fur seal has been called Eotaria crypta. Eotaria means 'dawn sea lion'. The species was tiny, with adults being only slightly larger than a sea otter and around the size of a juvenile New Zealand fur seal, according to University of Otago graduate student Robert Boessenecker, who found the fossil while looking through the John D. Cooper Archaeological and Paleontological Center.
In modern culture, people are taught not to settle. Settling is, of course, subjective and people change so when psychologists are in charge, there are a lot of divorces.
What about when science was in charge? Is it better to settle or hold out for the best mate?
A new evolutionary biology study says that it's better to settle for Mr. Okay than hold out for Mr. Right. And that may be why it is in our nature - traced back to the earliest humans - to take the safe bet when stakes are high, such as whether or not we will mate.
Fish vision just got more complex. Janderk
, CC BY-SA
By William Feeney, University of Cambridge
A recently published study offers new clues about the evolution of the immune system in European populations of the plant Arabidopsis thaliana and the underlying genetic mechanisms associated with immunity.
The species Arabidopsis thaliana, which is naturally distributed across the northern hemisphere, belongs to the same family than mustard. The species is used as model in plant biology studies because its genome is relatively small and appropriate for genetic studies.
A study using geckos has found that evolution can downgrade or entirely remove adaptations that have been previously acquired, giving the species new survival advantages.
In many species of plants and animals, individuals from the same population often come in different color variants. It's always been that way but why one color doesn't eventually replace the others through natural selection is something of an evolutionary biology mystery.
Namely, how and why do variants of the same animal exist in nature? In theory, different color morphs (variants) should be equally subjected to natural selection.
Northern Europeans pride themselves on being tougher than the rest of Europe when it comes to enduring weather. While most people are more likely to die in bad weather, a new paper finds that Norwegian kids were more likely to die when the weather was good.
By studying church records from 1750 to 1900 and looking at life history variables, such as how old women were when they had their first child and their last and how many years passed between the birth of each child and how many of these children survived, Gine Roll Skjaervoe at the Norwegian University of Science and Technology's (NTNU) Department of Biology made a strange finding - kids born in years with a lot of sunshine died more, and that meant fewer grandchildren.
Ribosomes: squiggly and yummy. crobin
, CC BY
By Robert Root-Bernstein, Michigan State University and Meredith Root-Bernstein, Aarhus University
Since the discovery of how DNA encodes genetic information, evolutionary biology has focused on genes. One popular hypothesis - the "selfish gene" theory - states that cells and organisms exist simply as packages to protect and transmit genes.
The selfish gene is by no means accepted and a new paper
gives biological 'selfishness' itself a twist, and proposes that if anything is "selfish" it must be the ribosome. That might change everything the public thinks they know about the evolution of life and, in fact, the function of ribosomes themselves.