Woodpecker population drills

Article Abstract:

The idea that species diversity in an ecosystem makes it more stable is not always supported by natural or model systems. A earlier study of populations of the acorn woodpecker on the Pacific coast of California found that overall oak abundance and woodpecker density were positively correlated, although distribution coincided with species diversity. The relationship has now been reexamined by Walter Koenig and Joseph Haydock and earlier findings that woodpecker populations are not maintained if just one species of oak is present, are conformed.

Woodpeckers, Acorns

---

Wide diversity of Crenarchaeota

Article Abstract:

Detection of three novel, low temperature Crenarchaeota of the bacteria-like Archaea from terrestrial and marine environments shows that they are widely divergent in nature. The crenarchaeota small-subunit ribosomal RNA genes are amplified and phylogenetic analysis is done. Three new, deeply divergent clades are detected within Crenarchaeota. The low temperature Crenarchaeota can use molecular hydrogen as an energy source.

Archaeabacteria, Archaea

---

Birds in double trouble

Article Abstract:

The call by some taxonomists for doubling the list of bird species from 10,000 to 20,000 based on DNA genetics will pose problems for ornithologists in the understanding of birds, and will affect the status of birds in international wildlife conservation. The debate over the issue revolves around two species concepts, the biological species, and the phylogenetic species concept (PSC).

Beliefs, opinions and attitudes, Birds, Protection of, Bird conservation, Birds, Varieties, Taxonomists

Similar abstracts:

• Abstracts: Prioritizing global conservation efforts. Human population in the biodiversity hotspots. Turning up the heat on hotspots
• Abstracts: Hell on no wheels. The security of knowing nothing. The long and winding road
• Abstracts: The force of fluctuations. Direct measurement of critical Casimir forces. Under Jupiter's pulsing skin
• Abstracts: Cooperation in male lions: kinship, reciprocity or mutualism? Individual and sex differences in the provisioning calls of European bee-eaters
• Abstracts: John Cowdery Kendrew (1917-97). A revolutionary philosopher of science. Jonas Salk (1914-95)

This website is not affiliated with document authors or copyright owners. This page is provided for informational purposes only. Unintentional errors are possible.