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Pemanasan laut menurunkan penyu untuk berjemur

Sebuah studi baru menunjukkan ,Penyu hijau dapat berhenti berjemur di pantai di seluruh dunia dalam abad ini karena naiknya suhu air laut ,. Basking membantu kura-kura mengatur suhu tubuh dan dapat membantu sistem kekebalan tubuh dan pencernaan . Dengan menganalisis enam tahun survei kura-kura dan 24 tahun data satelit , para peneliti telah menemukan kura-kura berjemur lebih sering ketika suhu permukaan laut menjadi  lebih rendah . ...read more

Warming seas
decrease sea turtle basking

Date:

January 23, 2015

Source:

Duke University

Summary:

Green sea turtles may
stop basking on beaches around the world within a century due to rising sea
temperatures, a new study suggests. Basking helps the turtles regulate body
temperature and may aid their immune system and digestion. By analyzing six
years of turtle surveys and 24 years of satellite data, researchers have found
the turtles bask more often when sea surface temperatures are lower. This vital
behavior may cease globally by 2102 if global warming trends continue.

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

green sea turtles may
stop basking on beaches around the world within a century due to rising sea
temperatures, a new study suggests.

Basking on sun-warmed beaches helps the threatened turtles regulate their
body temperatures and may aid their immune systems and digestion.

By analyzing six years of turtle surveys and 24 years of satellite data,
researchers from Duke University, the National Oceanic and Atmospheric
Administration (NOAA) Pacific Islands Fisheries Science Center and the
University of Ioannina in Greece have found the turtles bask more often each
year when sea surface temperatures drop.

If global warming trends continue, this behavior may cease globally by
2102, the study projects. In Hawaii, where the study was primarily focused,
green turtles might stop basking much earlier, by 2039.

The scientists published their peer-reviewed findings last week in the
journal Biology Letters.

"By comparing turtle basking counts with sea surface temperatures, we
found that green turtles tend not to bask when local winter sea surface
temperatures stay above 23 degrees Celsius," said lead researcher Kyle Van
Houtan, adjunct associate professor at Duke's Nicholas School of the Environment.

To conduct the study, Van Houtan and his colleagues used six years of
turtle count data collected daily by the Hawaiian nonprofit Mālama na Honu on
Laniakea Beach in Oahu. The counts showed regular, seasonal fluctuations in the
number of turtles basking on the beach. These fluctuations correlated with sea
temperatures at Laniakea, indicating that sea turtles bask more when waters are
cooler.

The scientists then compared these fluctuations in temperature and basking
to growth marks in the humerus bone of several green turtles. They found that
the growth lines occurred at the same time of year when turtles bask more,
between February and April.

The turtles' growth lines are similar to tree rings in that they indicate
periods of stress for the organism, said Van Houtan, who is also a scientist in
NOAA's Turtle Research Program. In trees, growth rings can indicate winter, dry
seasons, or periods of drought. In green turtles, the lines seem to reflect
periods when seas are colder and body temperatures are consequently lower,
prompting the turtles to haul out on beaches to warm in the sun.

More research is needed to fully understand the importance of basking and
the effect climate change will have on basking behaviors of green turtle
populations around the world. said Van Houtan.

Not all green turtles bask on land, he noted. Though the turtles are found
in tropical and subtropical oceans around the world, beach basking has only
been observed in Hawaii, the Galapagos Islands and Australia. Sea surface
temperatures at these sites have been observed to be warming at three times the
global average rate.

It is not yet clear whether populations that currently bask on land during
cooler months will adapt to warming sea temperatures and begin to bask
exclusively in the water, as do some other populations around the world.

"When looking at climate change, which is this vast geopolitical
issue, you have to drill down to specific climate variables impacting specific
aspects of an organism's life," said Van Houtan. "The next step for
us is to look at how turtles are storing climate data in their bodies -- in
their tissues, shells, and bones, and how we can tease that out."







Story Source:

The above story is based on materials provided by Duke University. The original article was written by Kati
Moore. Note: Materials may be edited for content and length.







Journal Reference:

1.    K. S. Van Houtan, J. M. Halley, W.
Marks. Terrestrial basking sea turtles are responding to
spatio-temporal sea surface temperature patterns. Biology Letters,
2015; 11 (1): 20140744 DOI: 10.1098/rsbl.2014.0744

http://www.sciencedaily.com/releases/2015/01/150123102217.htm

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