Related topics: climate change · extinction · plants · biodiversity · plos one

Excess nitrogen puts butterflies at risk

Nitrogen from agriculture, vehicle emissions and industry is endangering butterflies in Switzerland. The element is deposited in the soil via the air and has an impact on vegetation—to the detriment of the butterflies, ...

What factors put Philippine birds at risk of extinction?

The lush forests and more than 7,000 islands of the Philippines hold a rich diversity of life, with 258 bird species who live nowhere but the Philippine archipelago. A new study from University of Utah researchers suggests ...

Making a meal of DNA in the seafloor

While best known as the code for genetic information, DNA is also a nutrient for specialized microbes. An international team of researchers led by Kenneth Wasmund and Alexander Loy from the University of Vienna has discovered ...

Biodiversity 'hotspots' imperiled along California's streams

A study of woodland ecosystems that provide habitat for rare and endangered species along streams and rivers throughout California reveals that some of these ecologically important areas are inadvertently benefitting from ...

The path toward discovering a new species of Cicada

The 17-year cicadas emerging dramatically by the billions in 15 U.S. states from Georgia to New York and west to Illinois are making quite a racket—a uniquely North American phenomenon—but thousands of other cicada species ...

Too many forewing eyespots is bad for butterflies

Many butterfly species bear distinct circular markings known as eyespots on their wings, and the functions of these rings of contrasting colors vary. A long-standing theory is that they serve as anti-predator defenses—small ...

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Species

In biology, a species is:

There are many definitions of what kind of unit a species is (or should be). A common definition is that of a group of organisms capable of interbreeding and producing fertile offspring, and separated from other such groups with which interbreeding does not (normally) happen. Other definitions may focus on similarity of DNA or morphology. Some species are further subdivided into subspecies, and here also there is no close agreement on the criteria to be used.

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