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--></style><title>Real estate, lakes, rivers, home water: Septic
tanks don't</title></head><body>
<div><font face="Verdana">"The notion that septic tanks prevent
fecal bacteria from seeping into rivers and lakes simply doesn't hold
water, says a new Michigan State University study.</font></div>
<div><font face="Verdana"><br>
"Water expert Joan Rose and her team of water detectives have
discovered freshwater contamination stemming from septic systems.
Appearing in the<i> Proceedings of the National Academy of
Sciences</i>, the study is the largest watershed study of its kind to
date, and provides a basis for evaluating water quality and health
implications and the impact of septic systems on
watersheds.</font></div>
<div><font face="Verdana"><br></font></div>
<div><font face="Verdana">"'All along, we have presumed that
on-site wastewater disposal systems, such as septic tanks, were
working,' said Rose, Homer Nowlin Chair in water research. 'But in
this study, sample after sample, bacterial concentrations were highest
where there were higher numbers of septic systems in the watershed
area.'"</font></div>
<div><font face="Verdana"><br></font></div>
<div><font face="Verdana">"Until now, it was assumed that the
soil could filter human sewage, and that it works as a natural
treatment system. Discharge-to-soil methods, a simple hole dug in the
ground under an outhouse, for example, have been used for many years.
Unfortunately, these systems do not keep<i> E. coli</i> and other
pathogens from water supplies, Rose said."</font></div>
<div><font face="Verdana"><br></font></div>
<div><font face="Verdana">Full press release here:<br>
http://www.eurekalert.org/pub_releases/2015-08/msu-sta072915.php</font
></div>
<div><font face="Verdana"><br></font></div>
<div><font face="Verdana">Proceedings of the National Academy of
Sciences -</font></div>
<div><font face="Verdana">Published online before print August 3,
2015</font></div>
<div><font face="Verdana">doi: 10.1073/pnas.1415836112</font></div>
<div>http://www.pnas.org/content/early/2015/07/28/1415836112.abstract</div
>
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<font face="Verdana">"Climate change is not a new topic in biology
Observations of range shifts in parallel with climate change date
back to the mid-1700s."<br>
<br>
"A surprising result is the high proportion of species responding to
recent, relatively mild climate change (global average warming of
0.6C). The proportion of wild species impacted by climate change was
estimated at 41% of all species (655 of 1598)."<br>
<br>
Parmesan, Camille. Ecological and Evolutionary Responses to Recent
Climate Change.<i> The Annual Review of Ecology, Evolution, and
Systematics</i> 2006. 37:637-69. First published online as a
Review in Advance on August 24, 2006</font></font></div>
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