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Warm winter
expected to
affect animal
populations
By Corin Cook Daily News StaffPosted Mar. 6, 2016 at 5:00 AM
This winter, locals went without jackets,
drove around with the windows down and
shoveled much less snow than usual.
As meteorological winter (Dec. 1 through
Feb. 29) came to a close on March 1, the
National Weather Service reported that in
New England, this winter was the warmest
on record in Providence, Rhode Island;
Concord, New Hampshire; and Caribou,
Maine; and the second warmest in Boston;
Hartford, Connecticut; and Portland, Maine.
With the meteorological phenomenon El Nino
to blame, the warmer-than-usual winter
months have also interfered with local
animals’ biological clocks, which experts
believe may cause changes in animal
behavior and populations now and in
the coming months.
Marion Larson, chief of information and
education with the Massachusetts Division
of Fisheries and Wildlife, said the warm
weather has the ability to yield “local
population effects,” and changes in behavior.
whitetail deer in very thin snow covered woods
Something she is noticing is the “unusual
Larson recalls hearing spring peepers during a
few warm and rainy days the first week of
February.
“I’ve never heard spring peepers in the first
week of February,” she said about the frogs,
which typically start emerging in this area at
the end of March.
Immediately after the warm days in early
February, temperatures dropped below
freezing, Larson said, and the peepers “may or
may not have made it to cover for the impending
cold.”
She added, “It’s a whole lot easier if you’re a deer
or a turkey” than a frog.
Animals that feed on seeds and plants on the
ground are likely having no problem finding
food this year with the lack of snowfall, she said.
Lack of snow also makes it easier for birds of prey
to spot small mammals which would normally
burrow around and hide in the snow, she said.
The weather was also especially favorable for fish
and other pond dwellers who were not trapped under
inches of ice.
When aquatic creatures are trapped under ice for an
extended period, many suffer from hypoxia, an oxygen
deficiency, Larson said.
Coyote with his fawn kill
Because bodies of water were frozen for many months
This winter, she expects fish are faring much better.
Wildlife control operator Barry Mandell said the warmer
weather has affected the rodents and small mammals he
traps.
Beavers, skunks, squirrels, woodchucks, raccoons and
chipmunks are active earlier this year, he said.
There aren’t necessarily more of these animals, Mandell
said, but “next year there is going to be,” because they
are likely mating more than they would during a year
with longer cold patterns.
These creatures could run into trouble if there was
a limited food supply, Mandell said, but because last
fall’s acorn crop was abundant, the animals should
not face any food shortages.
This food security may be challenging to these animals’
predators, such as coyotes, because “there’s so much
food that their prey doesn’t travel,” said Mandell.
Ben Hix, an associate certified entomologist from
Dewey
Pest and Wildlife in Hopedale, said for many creatures,
when weather patterns are unusual “the internal clock
that they have sort of misfires.”
For instance, “migratory birds can start to come
home and lay eggs earlier,” he said.
Hix said he expects to see a “burst in the insect
population” because they may come out of hibernation
or diapause, a physiological state of dormancy,
prematurely.
Fisher attacking Porcupine on thin snow covered terrain
This past week, Hix said he started to notice insects
flying around, which is weeks earlier than usual.
Earlier activity means extended mating seasons, which
should result in increased populations for many insects.
There is “a lot of concern” centered around mosquitoes,
Hix said, because larger populations could mean an
increased risk of West Nile virus and eastern equine
encephalitis (EEE.)
Sam Telford, professor at Tufts Cummings School of
Veterinary Medicine, said however, that it is “hard to
generalize” what happens to certain populations and
the diseases they carry.
While mosquitoes that overwinter as adults in
basements or other abandoned areas may emerge
earlier, Telford, who specializes in mosquitoes and
ticks, said it may not mean an increase in
populations or mosquito-borne diseases.
In fact, he said, it is “completely unknown” if
temperature affects rates of West Nile or EEE,
because the occurrences are more often related to
air conditions in late summer.
However, Telford said he would expect the lack of
snow this winter could hurt snow-melt mosquitoes,
which are “huge nuisance mosquitoes in late May”
but do not carry diseases.
Snow-melt mosquitoes rely on “melting snow to create
pools” to lay their eggs. With little snowfall this year,
Telford said, he would expect lower birth rates for the
insects.
The weather “could influence the number of ticks,”
he said, “but it might not be immediately seen.”
“Adult ticks are usually inactive under the snow,” he
said, but in warmer winter temperatures they may
be active and laying eggs.
This should result in a lot more baby ticks in August
or September, he said.
Bobcat with hare
winter, we could see ticks actually suffer.”
Records show warmer winters in New England
are
usually
followed by an increase in Lyme disease.
During three recent warm winters, 2001-02,
2006-07 and 2011-12, Telford said, the
Department of Public Health has reported
roughly a 50-percent increase in the
number of Lyme disease cases in
Massachusetts.
Even small mammals, which are reaping
the most benefits from the warm weather,
cannot necessarily be expected to be
reproducing more, he said.
Telford said in working with mice, he was
expecting they would be reproducing more
this winter, but for some reason, they are
not.
“We think we know how things should
work,” he said, “but nature always throws
us for a loop.”
- cover, “ticks are
- exposed to the elements, so with the
- occasional deep
- freezes this
- last year, there was “a record level of
- fish kills,” in Massachusetts, said Larson.
- movement of amphibians.”
http://harvardforest.fas.harvard.edu/news/study-snowfall-linked-tree-growth-and-function
Study: Snowfall Linked to Tree Growth and Function
Monday, February 8, 2016
Snowfall affects forest tree growth and function well beyond the winter season, says a new study of a dozen Harvard Forest red oak and red maple trees, recently published in the journalEcosystems.
The study authors, Andrew Reinmann and Pamela Templer, both from Boston University, found impacts above- and below-ground when they removed snow from the ground in the study area, allowing the top layer of the soil to freeze.
As a result of the freeze, there were fewer living tree roots the following spring. Surprisingly, red maples affected by the freeze grew more in diameter, but also released far more carbon dioxide from their trunks and branches.
- Read Reinmann and Templer's scientific paper in Ecosystems: Reduced Winter Snowpack and Greater Soil Frost...
(Photo by Melody Komyerov courtesy of Boston University)
-----------------------------------------------------------------------------------------
Reduced Winter Snowpack and
Greater Soil Frost Reduce Live Root
Biomass and Stimulate Radial
Growth and Stem Respiration of Red
Maple (Acer rubrum) Trees in a
Mixed-Hardwood Forest
ABSTRACT
Northeastern U.S. forests are currently net carbon (C)
sinks, but rates of C loss from these ecosystems may be
altered by the projected reduction in snowpack and
increased soil freezing over the next century. Soil
freezing damages fine roots, which may reduce radial
tree growth and stem respiration.
snowless New England winter woodlands
We conducted a
snowless New England winter woodlands
We conducted a
snow removal experiment at Harvard Forest, MA to
quantify effects of a reduced winter snowpack and
increased soil freezing on root biomass, stem radial
growth and respiration in a mixed-hardwood forest.
The proportion of live fine root biomass during spring
(late-April) declined with increasing soil frost severity
(P = 0.05). Basal area increment index was positively
correlated with soil frost severity forAcer rubrum, but
not Quercus rubra. Rates of stem respiration in the
growing season correlated positively with soil frost
duration in the previous winter, (R2
LMMðmÞ = 0.15 and 0.24 for Q. rubra and A. rubrum,
respectively).
Losses of C from stem respiration were comparable to or
greater than C storage from radial growth ofQ. rubra
and A. rubrum, respectively. Overall, our findings
suggest that in mixed-hardwood forests (1) soil freezing
has adverse effects on spring live root biomass,
but at least in the short-term could stimulate
above ground processes such as stem respiration and
radial growth for A. rubrum more than Q. rubra, (2)
stem respiration is an important ecosystem C flux and
(3) the increasing abundance of A. rubrum relative to
Q. rubra may have important implications for C
storage in tree stem biomass.
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