?Main Image: Steer fitted with a global positioning system (GPS) collar to examine cattle responses to prescribed burns at the Central Plains Experimental Range in...
Florida Black BearLast Updated on 2013-10-29 16:30:17When the American black bear (Ursus americanus) in Florida was first scientifically described in 1896 by naturalist C. Hart Merriam, he thought its long skull and highly arched nasal bones distinguished it from black bears in other areas and classified it as a separate species (Ursus floridanus), which he called the Everglades bear. Subsequent analyses around 1960 revised the status of these bears to the Florida black bear (U. a. floridanus), one of 16 recognized subspecies .
Species:-- Ursus americanus Pallas, 1780
Black bears are... More »
PesticideLast Updated on 2013-09-17 21:47:54A pesticide is any substance or mixture of substances intended for preventing, destroying, repelling, or mitigating any pest.Though often misunderstood to refer only to insecticides, the term pesticide also applies to herbicides, fungicides, rodenticides, molluscicides and various other substances used to control pests. Under United States federal law, any substance or mixture of substances intended for use as a plant regulator, defoliant or desiccant is also considered a pesticide.
Pests are living organisms that occur where they are not wanted or that cause damage to crops or humans or other animals. Examples include:
mice and other animals,
unwanted plants (weeds),
microorganisms such as bacteria and viruses, and
prions. (See This PDF)
Many household products are pesticides. All of these common products are considered pesticides:
Cockroach sprays and... More »
Animal testing alternativesLast Updated on 2013-09-17 21:43:24
Among different ways that we have learned whether and how a chemical substance (or such physical properties as radiation or gravity) may cause short- or long-term harm to us, is to test the impact of the substances or properties in what scientists call model systems. Some of this testing may be conducted in glassware or other materials (for example glassware or petri dishes) either with living tissue such as cells in cultures, tissues obtained from experimental animals, specially-fabricated tools known as microarrays or with purely chemical systems. This is known as in vitro testing. Sometimes testing is conducted using living organisms, or laboratory animals, and is known as in vivo testing. Recently, a new approach to testing involves the evaluation of substances or physical properties using computer models. This is known as in silico testing. For example, physiologcally-based... More »
MinkLast Updated on 2013-07-22 17:50:04
The taxonomic classification of the American mink is: phylum (Chordata), class (Mammalia), order (Carnivora), family (Mustelidae), genus (Mustela), and species (vison). Other members of the Mustela genus include the weasel (Mustela nivalis), ferret (Mustela putorius), and European mink (Mustela lutreola).
Mink have been raised in captivity since 1866, and the accumulation of pertinent biological information has been encouraged by the economic importance of mink to the global fur industry, which is valued at greater than $11 billion USD. A vast body of information exists on the natural and life history of mink, including an extensive encyclopedia compiled by Sundqvist (1989) that contains almost 7,000 references. The monograph by Lariviere (1999) is also very thorough.
The mink is one of the most widespread carnivores in North America and is generally found throughout forested... More »
Urban yards as birds' refugesLast Updated on 2012-08-23 00:00:00
Urban yards with plants that mimic native vegetation offer birds "mini-refuges" and help to offset losses of biodiversity in cities,. Such purposeful landscaping with native vegetation helps local bird species.
Native Plants in Urban Yards Offer Birds "Mini-Refuges"
Yards with plants that mimic native vegetation offer birds "mini-refuges" and help to offset losses of biodiversity in cities, according to results of a study published in the journal PLOS ONE.
"Native" yards support birds better than those with traditional grass lawns and non-native plantings.
Researchers conducted the study through the National Science Foundation's (NSF) Central Arizona-Phoenix Long-Term Ecological Research (LTER) site, one of 26 such sites around the globe in ecosystems from coral reefs to deserts, from forests to grasslands.
"To a... More »
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