Estrogen , semak-semak , dan rasio jenis kelamin katak pinggiran kota--T-REC-komunitas reptil-semarang--KSE-komunitas satwa eksotik

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Estrogen , semak-semak , dan rasio jenis kelamin katak pinggiran kota

Date:

September 7, 2015

Source:

Yale University

Summary:

Estrogen di pinggiran kota  mengubah rasio katak hijau jantan  dan betina  di kolam terdekat , sebuah studi baru menunjukkan . Tingkat yang lebih tinggi dari estrogen di daerah di mana terdapat semak , kebun sayur , dan rumput  terawat rumput yang mengganggu sistem endokrin katak ' , menurut penelitian ini .

......... Penelitian ini muncul dalam jurnal Prosiding National Academy of Sciences . Hal ini didasarkan pada tes yang dilakukan di 21 kolam di barat daya Connecticut pada tahun 2012 .

Penelitian sebelumnya telah menunjukkan efek yang sama disebabkan oleh pestisida pertanian dan buangan air limbah ; studi baru menemukan  gangguan endokrin pada amfibi  juga ada di  pinggiran kota ............. more

Estrogen, shrubbery, and the sex ratio of suburban
frogs

Date:

September 7, 2015

Source:

Yale University

Summary:

Estrogen in suburban yards is changing
the ratio of male and female green frogs at nearby ponds, a new study shows.
Higher levels of estrogen in areas where there are shrubs, vegetable gardens,
and manicured lawns are disrupting frogs' endocrine systems, according to the
study.

...................

Green frogs in the suburbs are seeing a
gender revolution.

A new Yale study shows that estrogen in
suburban yards is changing the ratio of male and female green frogs at nearby
ponds. Higher levels of estrogen in areas where there are shrubs, vegetable
gardens, and manicured lawns are disrupting frogs' endocrine systems, according
to the study. That, in turn, is driving up the number of female frogs and
lowering the number of male frogs.

The research appears in the
journal Proceedings of the National Academy of Sciences. It is
based on tests conducted at 21 ponds in southwestern Connecticut in 2012.

Previous studies have shown similar
effects caused by agricultural pesticides and wastewater effluent; the new
study finds amphibian endocrine disruption also exists in suburban locales.

"In suburban ponds, the proportion
of females born was almost twice that of frog populations in forested
ponds," said lead author Max Lambert, a doctoral student at the Yale
School of Forestry & Environmental Studies. "The fact that we saw such
clear evidence was astonishing."

David Skelly, the Frank R. Oastler
Professor of Ecology at Yale and director of the Yale Peabody Museum of Natural
History, is the senior author of the study.

The researchers looked at ponds with
varying degrees of suburban neighborhood impact -- with entirely forested ponds
at one end of the spectrum, and ponds that were heavily surrounded by suburbia
at the other end. The sites included ponds linked to both septic systems and
sewer lines. In many cases, the researchers needed to obtain permission from
homeowners to survey their back yards.

"Our work shows that, for a frog,
the suburbs are very similar to farms and sewage treatment plants,"
Lambert said. "Our study didn't look at the possible causes of this,
partly because the potential relationship between lawns or ornamental plantings
and endocrine disruption was unexpected."

Lambert noted that some plants commonly
found in lawns, such as clovers, naturally produce phytoestrogens. The simple
act of maintaining a lawn, in other words, may be one source of the
contamination.

There also are possible implications for
other species that use suburban ponds, note the researchers. Those species
include other amphibians, such as wood frogs, spring peepers, gray tree frogs,
and salamanders, as well as birds, turtles, and mammals.

"Some of our lab's current work is trying
to understand how the suburbs influence sexual development in other
species," Lambert said.







Story Source:

The above post is reprinted from materials provided by Yale University. Note: Materials may be edited for content
and length.







Journal Reference:

1.   
Max R. Lambert, Geoffrey S. J. Giller,
Larry B. Barber, Kevin C. Fitzgerald, David K. Skelly. Suburbanization,
estrogen contamination, and sex ratio in wild amphibian populations. Proceedings
of the National Academy of Sciences, 2015; 201501065 DOI:10.1073/pnas.1501065112

http://www.sciencedaily.com/releases/2015/09/150907190643.htm

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