|
February 18 eNews Trivia: Do low temperatures at night affect groundwater discharge into streams?
Answer: Yes, extremely low temperatures at night essentially “shut off” the groundwater.
Stream discharge diminishes greatly during cold
nights. However, groundwater discharge regains quickly the following
day. Groundwater is typically regarded as a liquid unless permafrost
conditions exist. The temperature of groundwater is fairly constant and
relative to the mean annual air temperature.
To view water data from local Michigan streams, visit the U.S. Geological Society Real-time Water Data for Michigan.
Groundwater-fed rivers provide valuable fish and
wildlife habitat and numerous recreational opportunities. Local
communities depend heavily on the tourism generated by these coldwater
streams.
High inflows of groundwater, due to the extreme
permeability of the soils, are key to the stability of such river
systems. This groundwater provides suitable temperatures for coldwater
fish. These fish species are generally less tolerant of silt and
turbidity, and are commonly associated with a coarser stream bottom.
Research has indicated that sediment is the number
one pollutant in many of the rivers of northern Michigan. In a healthy,
stable river system, the amount of erosion is generally in balance with
the amount of sedimentation that occurs. Past and present human
activities have dramatically accelerated the rate of erosion along
these river corridors and reduced the ability of streams to flush out
sediment the way they normally would. Once introduced into
the stable water flow of our streams, sediment, particularly sand,
tends to remain for several decades.
Thank you Steve for this week’s question! Steve is a dedicated partner and assists with a number of projects including Large Woody Debris. Rarely does something positive happen on the Au Sable without his wise guidance.
-------------------
February 6 eNews Trivia: What invasive species will threaten the maple trees of Michigan if it becomes established?
Answer: Asian longhorned beetle (Anoplophora glabripennis)
The beetle is native to China where it prefers poplar, willow, elm
and maple trees. It has a large (1-1.5”) black body with white spots
and distinctively long antennae.
It is a threat to North American deciduous hardwoods. During the
larval stage, the ALB bores deep into a tree's heartwood, where it
feeds on the tree's nutrients. The tunneling damages and eventually
kills the tree. Tree species considered ALB host species include all
species of maple (Norway, sugar, silver, and red maple) as well as
horse-chestnut, poplar, willow, birch, London plane tree, mountain-ash,
mimosa (silk tree), and elm.
Signs of Asian longhorned beetle infestation include perfectly
round, 2 cm exit holes; frass, a sawdust-like material comprised of
tree shavings and insect waste; and oozing sap. Dead and dying tree
limbs or branches and yellowing leaves when there has been no drought
also signal ALB infestation. United States Department of Agriculture
(USDA) research indicates this beetle can survive and reproduce in most
sections of the country where suitable host trees exist.
The insect was first discovered in the U.S. in 1996. It is present
in New York, Illinois and Massachusetts where eradication efforts are
underway.
As illustrated by the Asian longhorn beetle, invasive species are an
international problem. Species like the emerald ash borer, Eurasian
watermilfoil and phragmites have already cost our state millions of
dollars. This is why Huron Pines has made this issue a priority by
creating the Invasive Species Removal program.
Through the Huron Pines AmeriCorps program, we have an Invasive Species
Coordinator working to map and remove target species. Key species
include: purple loosestrife (Lythrum salicaria), buckthorn
(Rhamnus spp.) and phragmites (Phragmites australis). Learn more at
Invasive Species Removal program.
Thank you Ned for this week’s question. Ned joined the Huron Pines
Board in 2007. Prior to that, he spent a number of years as a Forest
Supervisor for the DNR in the Pigeon River State Forest. He brings a
great wealth of knowledge about forest management and is a great asset
to our organization.
-------------------
January 21 eNews Trivia:
What is the name of the rare brown trout/brook trout hybrid?
Answer: the tiger trout (Salmo trutta X Salvelinus fontinalis)
The brown trout/brook trout hybrid exhibits
features of both trout but retains vertical markings or tiger stripes.
Tiger trout are known to be highly piscivorous (fish-eating). It is a
rare phenomenon in the wild, with the brook trout having 84 chromosomes
and the brown trout 80. Artificially, tiger trout can be produced
reliably enough to be grown by hatcheries. The hybrid cannot reproduce
naturally.
Huron Pines works to enhance fish habitat through our Large Woody Debris program
and protect our high-quality, coldwater stream. Check out some of our
fish structures upstream of Mio on the Au Sable and you may find the
natural anomaly. If you do see one, you’ll know the tiger came to be
naturally because fish are not stocked in this stretch of river.
Thank you, Bob, for providing a great question! Be sure to check out the Au Sable River Watershed Restoration Committee to learn about the outstanding work Bob and the committee are doing.
-------------------
January 7 eNews Trivia:
What is the only canine species with the ability to climb trees?
Answer: the gray fox (Urocyon cinereoargenteus)
Gray foxes are the only North American canines that
climb trees. They have been found in squirrel nests and abandoned hawk
nests up to 60 feet above the ground!
Gray foxes range throughout most of the southern
half of North America from southern Canada to northern Venezuela and
Colombia. They are solitary hunters and are largely omnivorous. These
clever climbers are thought to live from six to 10 years in the wild.
Thank you Andrea for this week’s question. Andrea
is a great resource partner for Huron Pines. She has been instrumental
in completing several road/stream crossings and serves on our Resource
Advisory Group. She is also an active Huron Pines Member.
Photo Credit: Steve Wayne Rotsch/Painet Inc.
-------------------
December 22 eNews Trivia:
Phragmites (Phragmites australis) plants can grow up to 15 ft. in height, but what percentage of the plant’s mass is underground?
Answer: 80%
Phragmites, also known as common reed, is a
perennial wetland grass. While it is native to Michigan, there is a
non-native, invasive variety of phragmites that is threatening and
overtaking wetlands and coastal areas.
Phragmites creates tall, dense stands that
essentially make it impossible for native vegetation to survive. The
monoculture that is created also crowds out animals and blocks
shoreline access to swimmers, fishermen, and hunters. A dangerous fire
hazard can also be produced by the dead, dry plant material left behind
each fall by the plant.
Learn more by viewing the Invasive Species Fact Sheet: Phragmites.
Thank you Tim for this week's question. As part of the Huron Pines AmeriCorps program, we are launching an Invasive Species program to
help address the issue in Northeast Michigan. During the 2009 field
season, Tim will be leading an inventory and monitoring several
key problem species: purple loosestrife (Lythrum salicaria), buckthorn (Rhamnus spp.), and phragmites (Phragmites australis).
-------------------
December 10 eNews Trivia:
Do all trout spawn at the same time of year?
Answer: Each species spawns at different times. Brown trout (Salmo trutta) start off the spawning run for salmonids in late October. Brook trout (Salvelinus fontinalis)
head to the redds in mid November, probably waiting until those big
browns are recovering and no longer on the prowl.
Rainbow trout (Oncorhynchus mykiss) are non-conformists and wait till spring, the beginning of April, to reproduce.
Angler tips from Thomas- It is important to leave
these fish alone when they are on the redds. They are very
vulnerable at this time. Don't fish to 'em, it only hurts the
fishery in the long run. In addition, never walk through redds or
areas with a lot of redds. There are eggs around and you could
damage them. Those eggs will disperse and hatch in short order.
What's the best approach
if you want to fish? Keep an eye out for activity in the stream;
shiny, bright spots in the gravel - it looks like somebody took a scrub
brush to them - are the tip off. Stay out of those stretches, try
another river, or take a break from fishing for a couple of weeks
around the end of October. If you do fish, don't cast around
redds and stay away from those areas, even getting out of the stream if
needed, when wading. It'll pay big dividends in the future.
Bob Stuber, a Fisheries
Biologist at the Huron-Manistee National Forests, added Rainbow trout
(and steelhead) and cutthroat trout generally spawn in the
spring. Brown trout and Atlantic salmon (genus Salmo) spawn in
the fall as do most members of the Pacific salmon genus (Onchorhynchus
spp.; chinook, coho, pink, chum, sockeye) and members of the char genus
(Salvelinus spp.; brook trout, arctic char, bull trout, lake
trout). And, these are only the trout and salmon native to North
America.
Learn more about fishing in Michigan at the Michigan Department of Natural Resources.
Thank you Thomas for this week’s question. Thomas
is a very active Huron Pines volunteer and member. He is an incredible
help with River Restoration projects through Huron Pines, Anglers of the Au Sable and the Au Sable Big Water Preservation Association. We greatly appreciate his dedication to conservation!
-------------------
November 26 eNews Trivia:
1. What is a baby turkey called?
Answer: Immature turkeys are called poults.
2. Wild turkeys often spend the night in trees. What species of tree do they prefer?
Answer: Turkeys prefer to spend the night in oak trees.
Wild turkeys are found in many areas across the
U.S. and part of Ontario, including most counties in Michigan. However,
this is following a major re-introduction effort that was first
successful after four failed attempts. They had disappeared from
Michigan by 1900, probably due to loss of habitat, and unregulated
hunting.
As year-round residents of Michigan, wild turkeys
move from grasslands and forest clearings that have lots of high
protein insects for their young in the summer to more covered areas
such as stands of mast producing trees in the winter. Wild turkeys are
a game species in Michigan and their numbers have increased enough to
support two hunting seasons each year (spring and fall).
Thank you Tim and Chris for
this week’s question. Tim recently began as the Invasive Species
Coordinator for Huron Pines. He graduated from Northern Michigan
University with a degree in physical geography and recently volunteered
with the Nevada Conservation Corps. We are looking forward to launching
several projects centered on removal and prevention of invasive species
with Tim.
Chris is the Implementation Coordinator and will be developing a water quality monitoring program, coordinating the Conservation First Responder Program and organizing volunteer workdays. He is a graduate of Michigan State University and majored in Fisheries and Wildlife.
-------------------
November 12 eNews Trivia:
What year did the state of Michigan pass the first legislative act regarding deer management?
Answer: In 1859, the state of Michigan established the first deer season dates.
White-tailed deer are the smallest of the three members of the deer
family found in Michigan, the others being elk and moose. They range
throughout Michigan and are a game animal in this state. As a species,
they extend from the southern edge of the arctic prairies in Canada,
all the way to the northern bank of the Amazon River.
Deer have been a valuable resource in Michigan since the first Native
Americans began to hunt them. Prior to European settlement, Michigan
had an abundant deer herd in the south. The mixture of hardwoods,
wetlands, bogs and forest openings was perfect for deer. There were few
deer in the virgin forests of the north, which were inhabited mostly by
elk and moose. The mature trees were so dense that sunlight could not
reach the forest floor and therefore little deer food was available.
As farmers and settlers moved into southern Michigan, deer were
exterminated by removal of cover and by unregulated shooting - deer
were mostly gone by 1870. Logging of forests in the north produced an
opposite effect--more openings, brush, and young forests - the northern
herd climbed to estimated 1 million deer in the 1880s.
As railroads were developed and provided access into the wilderness,
market hunters slaughtered hundreds of thousands of deer. Early
measures to control market hunting were not very successful, but in
1895, after several decades of ineffective management, a new law
significantly changed deer management by establishing a deer hunting
season (November 1 to 25) and limiting the number of deer that could be
harvested (five deer per hunter per year).
Thank you Eric for this week’s question! Eric has been with Huron Pines
for several years and works primarily on the Pigeon River Habitat
Initiative. He is an outdoor enthusiast and brings a unparalleled
positivity to Huron Pines.
To learn more about deer hunting in Michigan and view the current regulations, visit www.michigan.gov/dnr.
-------------------
October 29 eNews Trivia:
How far can witch hazel (Hamamelis virginiana), a small understory tree found in northern Michigan forests, shoot its seeds?
Answer: In the fall, witch hazel flowers will release their seeds by
shooting them up to 50 feet in the air! These seeds will lay dormant in
the seed bed for up to two years.
Witch hazels are relatively short-lived trees, surviving for
approximately 100 years. They are small, slow-growing hardwood trees
(some consider them shrubs) that often grow in the understory of a
mature forest. At maturity, they are generally 20-30 feet tall with a
trunk getting no larger than 5-7 inches in diameter. As for growing
conditions, witch hazel prefers full to partial sunlight and mesic to
dry forests.
The witch hazel is unique in that its yellow, four-petaled flowers are
in bloom in late fall and can even be seen into winter. Having flowers,
one might assume that to fertilize its seeds it cross-pollinates with
other witch hazel flowers. It does, but how does the witch hazel
cross-pollinate in the late fall and early winter when insects are not
as active?
Research has shown that there are several insects that are still active
when the temperatures turn colder. Small fungus gnats (Bradysia spp.)
are the main pollen vectors. Small parasitoid wasps, American hover
flies and tachnid flies have also been observed helping the witch hazel
to cross-pollinate.
Other names witch hazel has gone by are winterbloom, snapping alder and
spotted alder. The witch in its name is taken from the Anglo-Saxon word
-wych- meaning bending. The witch hazel is said to have divining
properties- when a Y-shaped branch is taken from the tree, it has been
known to be able to direct its wielder to water.
Many folks have heard of the medicinal properties that belong to the
witch hazel. The commercially-sold “Witch Hazel Water” is used as an
astringent and to sooth various muscle aches and pains. However,
historically witch hazel has been used medically for centuries.
European settlers would make a similar home recipe for “witch hazel
water” by mixing pieces of the inner bark, leaves, water and alcohol.
Additionally, the Ojibwa, Potawatomi, Menominee and Iroquois are said
to infuse (heat without boiling) the leaves to extract the witch
hazel’s active ingredient: tannic acid. From this solution, teas were
made that were said to relieve lung ailments, diarrhea, sore muscles
and various skin problems. Homemade infusions are more “potent” than
the store-bought variety because the tannic acid remains in the
solution. The process by which pharmaceutical companies make the
solution involves distilling, which renders the tannic acid inactive.
Thus, one question remains: why is the store-bought witch hazel water
still effective?
Thank you Craig! Mr. Kasmer has been wonderful in helping with Huron
Pines projects, especially the Huron Pines AmeriCorps program. Thank
you so much for your positive attitude and inquisitive mind. Go
Swampers!
-------------------
October 15 eNews Trivia:
How many singing males were counted in the 2008 Kirtland’s warbler (Dendroica kirtlandii) survey?
Answer: Approximately 1,800 singing males were counted.
The endangered Kirtland's warbler is one of the rarest members of the
wood warbler (Parulidae) family. It is a bird of unusual interest for
many reasons. It nests in just a few counties in Michigan's northern
Lower and Upper peninsulas, in Wisconsin and the province of Ontario.
Its nests generally are concealed in mixed vegetation of grasses and
shrubs below the living branches of five to 20 year old jack pine
forests.
To protect the bird, it was essential to provide more jack pine areas.
During the mid 1970s, some 134,000 acres of jack pine were designated
for management as Kirtland's warbler nesting habitat within state and
national forests. Additional lands were added through the 1990's to
bring the total public land specifically set aside for the Kirtland's
warbler to more than 150,000 acres.
The Kirtland’s warbler census is held from June 6-15 each year and is a
count of singing males, as the females do not sing. The numbers have
been rising since the early 1990s as the warbler population increases.
To learn more about the census, visit http://warbler.kirtland.edu/.
Quick Facts
The Kirtland's warbler was first described in Ohio in 1851
It is commonly referred to as the jack pine warbler
This songbird is one of 56 species of wood warblers in North America
Its nesting habitat is jack pine stands from 5-20 years old
It nests on the ground under living jack pine branches
Adult Kirtland's warblers are lightweight birds, weighing 1/2 oz
Its average life expectancy is two years
The diet of the warbler includes many insect species, as well as ripe blueberries
Breeding males have plumage of blue gray with black streaks
It spends the fall and winter seasons in the Bahamas
Brown headed cowbirds are parasites of Kirtland's warbler nests
Migrating at night, this wood warbler can come in contact with towers and other high structures
This information is from the Michigan DNR website “Kirtland’s Warbler.”
Thank you Aaron for this week’s question and for supporting Huron
Pines. Aaron has been vital in providing technical support through NRCS
to Huron Pines through our RC&D partnership. He has also been a
member of our organization since 2005. We are grateful to have such a
wonderful resource nearby.
-------------------
October 1 eNews Trivia:
How many trees were placed along the Au Sable during the Large Woody Debris helicopter week?
Answer: Over 415
Huron Pines has been working with a number of partners over the last
decade to replace trees along our rivers streambanks. Historically,
trees entered the river system as they died and fell along the
riverbank. However, during Michigan’s logging boom, most of the trees
were removed to allow downstream transport of timber.
For years, fisheries biologists have identified a lack of in-stream
“large woody debris (LWD)” as one of the major problems facing the Au
Sable River’s fishery. The trees are important because the debris
structures create critical fish habitat. And, the trees prevent future
erosion. In addition to providing habitat diversity for numerous
species of fish, invertebrates, reptiles and amphibians, the debris
protects streambanks from erosion and buffers the effects of high water
flows.
Therefore, we have a season long restoration crew working on these
issues and coordinate one week with a helicopter to lift whole trees
and place them into the river system. Trees up to 4,500 lbs from state
land are cabled and hooked onto a 150 ft. cable and then lifted and
carefully placed in the river. The cleared land will be turned into a
wildlife food plot.
Patrick has been with Huron Pines as the Restoration Project Manager
for 2.5 years. He has coordinated a number of valuable restoration
projects in the Au Sable, Pine and Ocqueoc River Watersheds. We would
like to thank him for all his efforts in making the Large Woody Debris
helicopter week a success.
-------------------
September 17 eNews Trivia:
On average how many eggs are in a clutch of a Ruffed Grouse (Bonasa umbellus)?
Answer: 8-14
Located in aspen woodlands and early succession mixed deciduous forests
with small clearings, the Ruffed Grouse is a popular game bird.
Population densities across the continent have declined in recent
decades, primarily from habitat loss. Many states in the U.S. have open
hunting seasons that run from September through January, but hunting is
not considered to be a significant contributing factor in the
population decline.
Ruffed Grouse nests occasionally are parasitized by Ring-necked
Pheasants or Wild Turkeys that lay eggs in the nests. In addition, the
Great Horned Owl is a common predator.
Thank you Nathan Skibbe for the question this week. Nathan is about to
complete his year of service with Huron Pines AmeriCorps. He's done a
fantastic job coordinating a multitude of volunteers in a variety of
conservation projects. To date, Nathan has utilized 232 volunteers in
895 hours of service. We appreciate all the great effort!
-------------------
September 3 eNews Trivia:
There are approximately 76,000 regulated dams in the U.S. What is the average life span of a man-made dam?
Answer: The average life expectancy of dams is approximately 50 years.
Of the estimated 2.5 million dams in the U.S., 76,000 are six feet or
greater in height; a minimum size for dam safety regulatory concerns.
Of these 76,000 dams, 80% or 60,000 are expected to be 50 years of age
or older by the year 2020. This implies that a large number of dams
will be in need of maintenance or considered for removal in the near
future.
This information comes from Effects of Dam Removal on Fluvial
Geomorphology and Fish (Michigan State University, 2007) by Bryan
Burroughs. At the Dam Summit on September 17, Bryan will be addressing
some of the current dam issues we face in Northeast Michigan.
-------------------
August 20 eNews Trivia:
Historically, what is the average number of years between wildfires in a jack pine ecosystem?
Answer: According to a US Forest Service Rapid Assessment Reference
Condition Model, the average fire interval is 22 years. However, the MI
DNR website reports that fires returned every 30 to 100 years.
The jack pine ecosystem is dependent on these fires because they are
necessary for the release of seeds. Fire also clears the area of
competition, which creates the sunny areas jack pine require to grow.
The endangered Kirtland's warbler relies on these young jack pine
stands. Nesting areas greater than 80 acres composed of jack pines at
least 5 feet tall are preferred. Such stands are typically eight years
old. The warblers will continue to nest in these forests until the
trees are about 20 years old. At this time, they begin to lose their
lower brances and are lees desirable nesting habitat (MDNR).
Thank you Emily for this weeks question. Emily is about to complete her
first year of service with the Huron Pines AmeriCorps program. During
her time at the Otsego Conservation District, she implemented several
youth environmental education programs and native plant projects.
Emily's efforts have not only improved resources in Northeast Michigan,
but are helping create long-lasting stewards of the land.
-------------------
August 6 eNews Trivia:
In 2006, there were 1.4 million anglers in Michigan. How many were primarily interested in fishing for trout?
Answer: Nearly 180,000 or 13%
Trout may be less widely distributed in northern Michigan waters in the
coming decades in response to global climate change. The most recent
climate modeling predicts warmer temperatures and lower water levels
for much of Michigan (although intense rainstorms and flooding will be
more common), particularly in the summer. This is bad news for trout,
who need cool summer water temperatures to survive.
As a result, efforts to protect our headwater streams and the cool
groundwater they provide to our rivers will become even more important
in the future than today.
Thank you to Greg Goudy for the trivia question this week. Greg works
for the Surface Water Quality Division of the Michigan Department of
Environmental Quality. He has helped Huron Pines and our partners
develop and implement many of the watershed projects that benefit our
lakes and streams, including stormwater management, water quality
monitoring, development of watershed management plans, and installation
of road-stream crossing Best Management Practices.
-------------------
July 23 eNews Trivia:
What is the sweetest soil in Michigan?
Answer: Sugar Soil!
Found in Chippewa County, this soil is moderately well drained and
formed in loamy lacustrine sediments over calcareous clayey materials
on lake plains. Common tree species in forested areas include sugar
maple, red maple, quaking aspen, white spruce, and paper birch.
Michigan has a unique blend of soils. The picture to the right(courtesy
of NRCS) is Michigan’s state soil, Kalkaska Sand. This was chosen
because it is found on both peninsulas, covers over a million acres and
sustains wooded forests. Largely developed from glacial sediments, soil
characteristics in Michigan vary widely from one place to the next.
Steve Rodock has been a soil scientist with the Natural Resources
Conservation Service for over 20 years. He is also always eager to
learn more about American history. Steve has been a great resource for
Huron Pines and helped us greatly with GIS and trainings. Thanks again
Steve!
-------------------
July 2 eNews Trivia:
How many river miles, lake acres and shoreline miles are in Huron Pines’ 11-county service area?
Answer: 5,005 river miles, 172,800 lake acres and 467 shoreline miles.
Thank you Lisha for this week's question. Lisha has been with Huron
Pines for 5 years. As Program Director, she oversees staff projects as
well as heads the Huron Pines AmeriCorps project. She has also been a
supporter of Huron Pines through the membership program.
-------------------
June 25 eNews Trivia:
What North American songbird has the longest migration, over 12,000 miles round-trip?
Answer: The bobolink (Dolichonyx oryzivorus) leaves northern Michigan
in late July migrating along the southeastern coast to Florida. The
migration continues across the Gulf of Mexico to Cuba. After a rest
stop in Cuba, they continue across the Caribbean Sea to South America
to southern Brazil, northern Argentina, and Paraguay.
Found in open fields and hayfields, the bobolink has white on the back
and black underneath, the only American bird with that plumage. This
coloring makes the male stand out while he is performing his displays
and singing its melodious call. After breeding, the males spend the
rest of the year in a drab, camouflaged plumage.
The courtship behavior and beautiful song of the Bobolink make for
great bird-watching. Unfortunately, the early mowing of hayfields
disrupts young fledglings and has reduced their numbers. Delaying
mowing in hayfields benefits this species.
Cool Facts (from Cornell Lab of Ornithology) http://www.birds.cornell.edu/AllAboutBirds/BirdGuide/Bobolink.html#description
One female, known to be at least 9 years old, presumably made this trip
annually, a total distance equal to traveling 4.5 times around the
earth at the equator! The Bobolink is one of the few songbirds who
complete two molts each year, completely changing its feathers on both
the breeding and wintering grounds.
Thank you Ann Baughman for providing us with the question this week.
Ann has worked with us on many projects through the years and is also a
donor to our organization. She is employed as the Outreach Specialist
at Freshwater Future in Petoskey.
-------------------
June 13 eNews Triva:
How deep can loons dive?
Answer: loons, an icon of our northern Michigan lakes, can dive 200-250 feet deep!
Thanks to Jeff Silagy, Michigan Department of Environmental Quality,
for providing this question and answer. Jeff is a supporter of Huron
Pines and provides technical input as a participant with our Resource
Advisory Group.
Loons are very sensitive to pollution, development and disturbance.
Many of our Huron Pines members are avid lake enthusiasts, but there
are things we can all do to help sustain the loon population, such as
keeping our lakes clean by participating in programs like shoreline
greenbelt protection. It's also really important to give loons plenty
of space during their time of nesting and chick-rearing, which takes
place early in the summer.
-------------------
May 28th eNews Trivia:
Just how high do brook trout jump?
The maximum height brook trout have been observed jumping in the wild is 2 feet.
This maximum height was recorded for a strong adult brook trout, which
means smaller fish will not be able to jump as high. Why is this
important? We can spend thousands of dollars and hundreds of hours of
labor improving habitat in the river, but if the fish can’t easily
access that part of the river then your efforts were wasted. In order
to restore habitat for brook trout we need to make sure that the trout
can travel the entire length of the river. Often fish are blocked at
road crossings when culverts are perched (too high on the downstream
side of the flow for fish to jump into), if the culverts are blocked or
damaged in some manner, or if the water velocity in the culvert is too
strong (1 m/sec. will block all fish passage, even salmon). If the
culvert is higher than 2 ft. then passage for strong, adult brook trout
will be blocked, and fish will not be able to access the upper reaches
of a river. Next time you are out driving around, stop and take a look
at the road crossings at your favorite stream. Are they blocking fish
passage?
Thanks to Heather Rawlings, biologist with the US Fish and Wildlife
Service, for providing this question and answer. Through her work with
USFWS, Heather provides technical input and funding to many of the
projects Huron Pines works on. She also serves on our Resource Advisory
Group and we're pleased to have her support as a member of Huron Pines. |