In addition to current events and timely articles, this “news” page is meant to serve as an archive of information on all things forest — flora & fauna posts, camping & hiking tips, etc. Whatever you’d like to learn or remember, please browse using the tags, or search.
The Cook Forest Conservancy obtained permission from the author to link to this informative article, which summarizes the situation, the current science, and the programs and trials underway in the US to control HWA (hemlock woolly adelgid, an invasive insect) on Eastern Hemlocks, as of late 2020. Cook Forest State Park is a priority area for HWA treatment, as both an exemplary old-growth area, and a National Natural Landmark – so our trees are in better shape than most. HWA is currently in the forest, though, and we and all others in hemlock forests must remain informed and vigilant.
Hope for hemlocks: New tactics found to fight deadly pest
by Ad Crable for the Bay Journal, 23 November 2020
The article bluntly sets forth the magnitude of the threat:
“Without intervention, most trees in natural settings will die,” according to [Pennsylvania’s] latest Eastern Hemlock Conservation Plan.
There still are an estimated 124 million hemlock trees greater than five inches in diameter alive in Pennsylvania. But that’s nearly 13 million fewer than in 2004, and the mortality rate has increased fourfold since 1989.
and emphasizes the importance of Eastern hemlock to hundreds of other species, and its unique and irreplaceable niche in the forest ecosystem. For example, Hemlock groves provide cooling, filtering, and erosion control along streambanks, and their survival is essential for the survival of native trout, and the other organisms of Pennsylvania’s cold water streams.
The article succinctly covers the current methods of protecting hemlocks, from injecting chemical pesticides into the soil surrounding tree roots, to releasing varieties of beetles and sliver flies that predate on the HWA. Scientists are studying stands of hemlock which appear resistant to HWA, and working on replicating this characteristic.
Science is working to help the hemlocks find a natural balance – to let the tree adapt to this non-native insect threat, or to bring in predators of HWA to keep its impact on hemlock health manageable – and to keep this valuable and venerable conifer in our forests. Because, as Donald Eggen, forest health supervisor for the Pennsylvania Bureau of Forestry so aptly states:
When you walk through a hemlock forest, you are experiencing a unique habitat that is only found in a hemlock forest.
Poor Zombie Moth!
This moth has a fungus! Spotted by the CFC on a hike near Cook Trail, this moth was identified by a PA Bureau of Forestry entomologist as likely having been infected with a Cordyceps fungus.
What this means for our hapless moth friend is – ultimately- mind control, followed by death.
“When a Cordyceps fungus attacks a host, the mycelium invades and eventually replaces the host tissue,” which sounds incredibly unpleasant. And apparently, the host/ victim has a slim shot at self-defense once infected, as “entomopathogenic fungi… have many novel strategies to escape or suppress host immune responses.”
More creepily yet, “Cordyceps is known to have the ability to control an insect’s end-of-life wanderings, which it benefits from by increasing the likelihood that its spores are dispersed to new hosts.” This explains our moth’s forced death-march up the tree trunk to a height optimal for re-infection of other critters. Such mind-control behavior can be illustrated in infected ants – see the National Geographic video below.
These fungi are so effective, they’re used as a bio-control agent against forest and farm pests:
Entomopathogenic fungi are the most abundant type of microorganisms that infects insects. […] As the natural pathogens of a variety of insects, entomopathogenic fungi can be environmentally friendly alternatives to chemical insecticides for biological pest control.
Learn more / Sources:
- Moth Quietly Meets Demise By Fungus
- Entomopathogenic Fungi – (Heavy Science Reading) – CFC’s source is an excerpt from “Insect Immunity,” Liu & Ling, Advances in Insect Physiology, 2017
- Wikipedia: Cordyceps
Cordyceps comprise a number of species, and we’re not able to distinguish which might be infecting our Cook Forest moth.
All Cordyceps are members of the Kingdom of Fungi, as follows:
- Phylum: Ascomycota
- Class: Sordariomycetes
- Order: Hypocreales
- Family: Cordycipitaceae
- Genus: Cordyceps
Etymology: Cordyceps is from the Greek, meaning “club head”
Sadly, most Americans can’t see our galaxy due to light pollution, but you can still celebrate the Milky Way beneath the dark skies of Cook Forest State Park – a great site for stargazing.
The Milky Way, lots of constellations, and several planets are easily visible from open areas in Cook Forest. You don’t even need a telescope (or astronomy binoculars), just clear skies, a weak moon, and a couple of tips. Here are some resources for stargazing in and around Cook Forest:
Cook Forest Stargazing Links:
- ClearDarkSky.com – forecast for sky-viewing quality for thousands of sites, including this direct link to the current astronomy forecast for Cooksburg, the village inside Cook Forest State Park. From the main site, explore light pollution maps and stargazing forecasts for locations across North America.
- this map from LightPollutionMap.info will show you the best areas, locally, and where to avoid setting up your blanket
- Interactive Sky Chart – know which stars you’re seeing! If you have cell or wifi service… if not:
- the Evening Sky Map is an excellent printable guide to the night sky, updated monthly. Download a current PDF for free!
Northwestern Pennsylvania Astronomy Resources:
- IDApgh.org – the Interntational Dark Sky Association, Pittsburgh chapter, has information on events in the area, current dark sky projects, and educational resources.
- Cherry Springs State Park – Pennsylvania’s only “Dark Sky Park,” and the only site in the state recognized by the International Dark-Sky Association, Cherry Springs is a must-stop for stargazers.
- Clarion University, Pierce Planetarium – the physics department hosts frequent star shows in its 40-foot dome – follow their facebook page for upcoming events.
But, before you go, here’s an excellent illustration of the difference darkness makes when stargazing – or, when practicing celestial navigation:
Light pollution threatens wildlife health, disrupts circadian rhythms, derails pollination, and greatly reduces the quality of stargazing. Find out how you can help combat it, and keep our skies dark:
Penn State Extension has released updated guides to the invasive plants of Pennsylvania — these are excellent free info for landowners struggling with non-native plants taking over their properties.
A synopsis of the threats posed by these invasive plants, from the Invasive Plant Sheet Series announcement:
The term “invasive” is used to describe a plant which grows rapidly, spreads aggressively, and […] degrade native environments by causing a decline in native plant species diversity. They degrade wildlife habitats for native insects, birds, and other wildlife and threaten rare species. In addition, invasive plants have been shown to inhibit forest regeneration success, and slow or halt natural succession. Once well established, invasive plants require large amounts of time, labor, and money to control or eradicate.
Once Pennsylvania landowners learn how to ID these invasive plants, they can effectively “implement control measures to help prevent further spread and habitat degradation,” hopes David Jackson, Penn State Forest Resources Educator, and co-author on many of the species sheets.
Direct links to the species most problematic in the Cook Forest State Park area are in the bullet list above – or find an links to all the invasive plant species fact sheets via the button above.
Even MORE information, including the most effective methods of control, are indexed at the Penn State Extension Invasive & Competing Plants page.
Tiny Turquoise Mushrooms!
Identified for the CFC by instagram photographer @fungiwoman, Chlorociboria aeruginascens, a/k/a green elfcup, is the fungus behind that gorgeous turquoise wood you’ll find on Pennsylvania trails.
While the stained wood is common, spotting the tiny, 2-5 mm diameter fruitbodies is a rarity. They occur in summer and fall in the Northeast – these were found on 2 Sept 2020, on Cook Trail in Cook Forest State Park, Pennsylvania. Green elfcup prefers hardwoods, particularly oak, and little shards of the fallen wood that has hosted it can be found on trails and amongst the fairy moss, which seems fitting.
Etymology: aeruginascens is Latin meaning “becoming blue-green”
“Fourteenth and 15th century Renaissance Italian craftsmen used the wood to provide the green colors in their intricate inlaid intarsia designs” – to see some examples, and read some heavy-duty science, visit this link to a botany page of the University of Wisconsin-Madison.
a Penn State Forest Stewards series article – written by Jim Finley, Professor Emeritus, Forest Resources Management, Center for Private Forests at Penn State.
Oaks are economically important tree species in Pennsylvania and across the East. Acorns, or mast – a word derived from old English which means “forest food,” are important to wildlife. Oak-borne mast production varies from year to year. Much research has sought to predict masting years, when big acorn crops occur, and shed light on what leads to poor years – or early acorn abscission (detachment) – like you may have seen this season.
Oaks separate into two groups, popularly referred to as red and white, and learning to identify the difference between the two groups is easy.
Red oaks – e.g. Northern red oak, pin oak, scarlet oak, and black oak – have small “bristles” on the lobes and tips of their leaves. White oaks – e.g. white oak and rock, or chestnut, oak – lack these bristles, and have rounded leaf lobes. (CFC note: the image above is of a white oak.) There are other differences that are more difficult to recognize, such as acorn structure and wood anatomy.
The Process of Creating an Acorn –
and the Trials of 2020
Both red and white oaks produce female and male flowers on the same tree, unlike ash which has male and female trees. The process of producing an acorn starts late in the growing year when the male flowers form as the tree’s growth slows toward the end of summer. That is the end of the first year (year 1) in the process. Then, in the second year (year 2), as the tree comes out of dormancy, female flowers form in the axil of the leaf stem and the twig and remain dormant. As the spring leaves begin to unfold, the male flowers emerge and are very apparent as rather-long, drooping, greenish-yellow catkins. These appear about two weeks before the much smaller female flowers emerge.
White Oak Acorn Production
For the white oaks, as the male and female flowers emerge in year 2 as described above, pollination and fertilization should happen. The pollen from the male flower, which is wind-disseminated, lands on the style, which is part of the female flower. When this happens, the pollen initiates the development of a pollen tube that transfers male cells into the ovule to complete fertilization and the process of acorn formation should start in earnest. For this to happen, it is ideal to have warm days and cool nights.
If temperatures are not right, fertilization may fail, and the female flowers will abort, which results in low acorn initiation. Alternatively, if temperatures become too hot or drought conditions occur, white oak acorns may abort, which is likely apparent in mid-June to mid- to late-July; perhaps that is the reason for reported early acorn drop this year. The other big threat to white oak acorns is late spring frosts, which also happened this year, and would again remove the fertilized flowers.
Hemlock Woolly Adelgid in Cook Forest State Park
Hemlock woolly adelgid (HWA) has been consistently treated by state agencies since it was first found in Cook Forest State Park in 2013. First – the bad news – it’s still here. The photo above was taken in May 2020, and those white little cotton-like tufts confirm the presence of HWA on hemlock trees within park boundaries.
The good news:
- the infestation is not blanket, but concentrated in small areas;
- the Eastern Hemlocks in Cook Forest remain largely healthy;
- the state is continuing treatment, even in this most uncertain of years — 100,000 inches of trees are scheduled to be treated again in 2020, as soon as rainfall rises the water to levels enabling soil injection
HWA was never going to be a short-lived threat, and it’s important to keep in mind the utter devastation it wrought in the Great Smoky Mountains, where it hit first, and in a warmer climate. The PA Bureau of Forestry continues to work toward establishing a bio-control for the insect, as exists in places where HWA is native (the Pacific Northwest and Japan). Until then, regular treatments can keep these hemlocks healthy, and their surrounding ecosystems intact. Eastern Hemlock is a “keystone” species, and integral for keeping our streams cool and clear, for filtering pollutants, and for and managing storm runoff.
These tasks become more challenging as our climate cycle changes – we’ve experienced stronger, shorter storms punctuating long dry periods, which means less water is being absorbed into the aquifer. Western Pennsylvania also had a warm winter, which favors reproduction of HWA – and they reproduce exponentially.
HWA – What can be done by individuals to protect Hemlock trees?
Monitoring is of utmost importance – regularly check the health of the hemlocks in your yard, and stay vigilant when hiking or out on state forest lands. Since HWA often infects trees from the top down, especially check branches blown off by wind, and the upper canopies of hemlock trees that have recently fallen.
We appreciate your supporting ongoing efforts – both in the state and private sectors – to control HWA.
- Private landowners seeking assistance for trees they think may be infested can contact the CFC, or their county’s Service Forester.
- To report infestations found on public land, please email PaForester@pa.gov – it’s ideal if you can provide a GPS location, and a clear photograph of the suspected bugs, as well.
a Penn State Forest Stewards series article – written by Allyson Muth, Interim Director, Center for Private Forests at Penn State.
Many areas across the northeastern US are experiencing dry and drought conditions, Pennsylvania included. As of July 28, two-thirds of Pennsylvania was in an abnormally dry to moderate drought condition. Yet, tallied across the state, we are very close to the total predicted rainfall for an average year to date. Depending on where you look in Pennsylvania, the regions are somewhere between 25% below, to as much as 26% above annual precipitation. These numbers don’t sound like they would result in two-thirds of the state be in abnormally dry conditions. So, how does that work?
Climate change models for Pennsylvania have consistently predicted the pattern that we’re seeing this summer. Less frequent, but more intense rainstorms, with extended drought periods occurring between those large rain events. The result is highly variable and uneven conditions across the state. Conversations with landowners in the south central region have shared their recent 4-inch rain storm events and subsequent flooding. In many other Pennsylvania regions, rains came early, and we’ve entered a dry summer period with rather infrequent rain events.
Pennsylvania is known for its waterways – over 86,000 miles of streams, creeks, and rivers. We usually have ample water during the growing season. We rarely have the water conservation requirements that the US West and Midwest implement to conserve water for human consumption. But when it’s this dry, do we need to worry about the trees?
Healthy, established trees can normally withstand relatively long periods of drought, so long as there are intervening months or years that are more favorable. However, recently planted trees, or trees with small soil footprints (rootprints?) are more susceptible to decline under these dry conditions.
UPDATE: Please bear with us 🙂 – the event is now limited to 25 attendees, per PA guidelines on COVID-19 – – RSVP is req’d via 814-744-8407 or firstname.lastname@example.org, & please bring your masks & respect social distancing ** Please DISREGARD Facebook attendance indicators, as we’re not using that system **
Our apologies, but as this is the first event in the park following its reopening, and as several state entities are cooperating in its production, we just got the word that we need to collect registrations for the event. We appreciate your understanding!
Wielding microphones and sheets and wearing headlamps, bat biologist Amber Nolder and entomologist Tim Tomon will survey bats and moths, educating onlookers as they monitor this aspect of forest health. We’ll begin with some presentations, move into the field, and learn about these important Cook Forest residents. Here’s a recap & gallery from last year’s stellar bat & moth event – but, this year, it’s
Bats & Moths – and then Synchronous Fireflies!
Our annual program has happily added a (hopeful) appearance by the rare and elusive synchronous fireflies! Once the Photinus carolinus & friends have emerged (probably around 10 pm), we’ll walk up nearby Tom’s Run Road a short distance into the darkness, and enjoy their silent light show. Allegheny National Forest & Cook Forest State Park are among the only places to see these little fellows in America – they’re so famous in the Smoky Mountains there’s a lottery to see them!
Since the primary threats to fireflies are habitat loss and light pollution, the “lightning bug” portion of the program will be pitch black, so they can communicate. The dirt road is somewhat uneven – if you have a headlamp or flashlight with a red lamp function, please bring it along for the trek in toward the firefly swamp.
Friday, 19 June 2020 – 8:30 pm – 10:30 pm >>
add event to your google calendar
We’ll be at Shelter #2 off Forest Road in Cook Forest, approx. coordinates: 41.346609, -79.218915, and the google maps code is 8QWJ+JC Cooksburg, Pennsylvania.
This event is free – no registration required. Please bring a coronavirus mask, a light (headlamps with a red or green night-vision filter are best) and a refillable water bottle – we’ll have bat & moth eyemasks for the kids to color. NB re CORONAVIRUS: By attending, participants assume responsibility for any and all risk due to possible exposure to COVID-19. Please DO NOT attend if you have been exposed to someone with COVID-19 in the last 2 weeks.
This annual event is a collaboration of the Cook Forest Conservancy, the PA Game Commission, the PA Bureau of Forestry, and the DCNR of Cook Forest State Park
Coronavirus cabin fever? Lots of house-bound folks are getting into birdwatching lately – a fun & easy outdoor springtime activity, even better when you’ve got a couple of guide books and apps, and a pair of decent binoculars. While we at the CFC are beginning birders ourselves, here’s a list of resources that we find helpful. Please note, some of these are Amazon affiliate links, so the CFC receives a small commission if they lead to purchases – at no additional cost to you.
- Audubon Bird Guide – amazingly comprehensive. Download the Eastern data file to access multiple search indexes, high-res images, and bird call audio when you’re offline.
- Merlin Bird ID – identify that bird by key, or by photo! Another great free birdwatching app
- eBird – Cornell Lab’s quick & simple app interface for tracking sightings
- Peterson Field Guide to Birds of Eastern and Central North America, 6th Edition – a classic, this beautifully-illustrated guide from our friends at the Roger Tory Peterson Institute is the one we reach for most often. (NB: a newer edition has been published.)
- Birds of North America, Golden Field Guides – great for young & old alike, with vibrant illustrations in a compact format.
- What It’s Like to Be a Bird: From Flying to Nesting, Eating to Singing — What Birds Are Doing, and Why (Sibley Guides) – fun facts and lovely illustrations.
- The Laws Guide to Drawing Birds – easy-to-follow step-by-step bird blueprints for field sketching your sightings.
- How Birds Live – a 1940s softcover guide to the many mysteries of birds, and an interesting method for charting their songs and calls
Online Birding Resources:
- Seneca Rocks Chapter of the Audubon Society – www.senecarocksaudubon.org
- Cornell Lab of Ornithology – https://www.birds.cornell.edu/home/
- American Bird Conservancy – https://abcbirds.org/birds
Items that Help Bring the Birds to You:
- binoculars – probably the only investment a beginning birder should make. Audubon has a comprehensive guide to binoculars at various price points here, and from this list I bought the Celestron Nature DX 8×42 and have been really pleased with their brightness and clarity. I also have the 10×42 model of the Nature DX, and it’s great, too – they magnify a bit more, and are a bit harder to target and hold steady.
- bird feeder, tube style – this model is also available at Tractor Supply and Wal-Mart, has lasted several years, and attracts chickadees, tufted titmice, goldfinches, sparrows, nuthatches, woodpeckers up to red-bellied size, cardinals, and bluejays. Grackles are almost too large for it, and they dislike a hood (e.g. a 2′ or so diameter circle slid over the hanger) or roof add-on, if you’re having problems with them.
- bird feeder, double suet cage – a good sturdy design for attracting woodpeckers and nuthatches, and the flat roof doubles as a platform for feeding oranges, etc.
- hummingbird feeder – this model is easier to clean than the bottle types. Hummingbird feeders should be boiled or washed with a weak bleach solution between fillings, so they don’t harbor mold & bacteria. Here’s the best recipe for hummingbird nectar – only use plain white sugar and water, in a one to four ratio.
Save money and multiply your favorite heirloom plants for your yard and to give to friends — hardwood cutting techniques are simple and inexpensive to do at home, once you’re familiar with the procedures. Ty Ryen, PA DCNR Bureau of Forestry Service Forester and Certified Arborist, compiled a list of recommended resources:
Books (these are Amazon affiliate links, so the CFC receives a small commission if they lead to purchases – at no additional cost to you):
- Secrets of Plant Propagation: Starting Your Own Flowers, Vegetables, Fruits, Berries, Shrubs, Trees, and Houseplants, by Lewis Hill
- Plant Propagation A to Z: Growing Plants for Free, by Geoff Bryant
- Plant Propagator’s Bible: A Step-by-Step Guide to Propagating Every Plant in Your Garden, by Miranda Smith
- RHS Propagating Plants, by Alan R. Toogood
- The Complete Book of Plant Propagation, by Graham Clarke & Alan R. Toogood
- The Reference Manual of Woody Plant Propagation: From Seed to Tissue Culture, 2d Edition, by Charles W. Heuser and Michael Dirr
- Making More Plants: The Science, Art, and Joy of Propagation, by Kenneth Druse
- Penn State Extension –https://extension.psu.edu/programs/master-gardener/counties/chester/how-to-gardening-brochures/propagating-by-cutting-or-layering
- University of Maine – https://extension.umaine.edu/gardening/manual/propagation/plant-propagation/
Supplies: You can usually use things you have on hand – just disinfect all potting vessels (pots, nursery flats, etc) with hot water and dish soap, or a 10% bleach solution, to protect cuttings & seedlings from disease. Make sure your pruners are very sharp, and disinfect these as well between cuttings – the ARS, HP-130DX 7-Inch Ideal Light Pruner is excellent, and should be about $30. The CFC also uses the 7″ ARS HP-VS7XZ Heavy-Duty Hand Pruner, but this is likely overkill for propagation cutting. Buy or mix a high-quality planting medium, ideally also sterile. >> Click this link for a PDF listing recipes for recommended soil and soilless mixes for seedlings and cuttings <<
We’re sorry to have had to cancel the March 2020 propagation seminar in Cook Forest, but are hoping to reschedule for the autumn, when conditions are optimal for propagation success. If you have questions, please contact Ty Ryen, Service Forester for Forest & Venango Counties, at 814-677-8076, or (omit the spaces in the email address): tryen @ pa.gov
EVENT CANCELLATIONS & CLOSURES in Cook Forest State Park due to Coronavirus / COVID-19 – as of 16 March 2020:
[A]ll public educational programs, special events such as races and festivals, and teacher and other trainings in state parks and state forests are cancelled until April 30. This includes programming by Friends groups and the Pennsylvania Parks and Forests Foundation and other partners. This also includes weddings, family reunions, fundraisers, trail rides or any other type of event that required an agreement or reservation. — DCNR
Click this image for further updates, posting to the Cook Forest Conservancy facebook page:
CANCELLED IN COOK FOREST:
- 14 March – Plant Propagation with a DCNR Service Forester
- 21 March – Friends’ hike of Indian Trail
- 28 March – CFSP Eagle Watch
- 12 April – Easter Sunrise Service
- 24 April – Earth Day 50
- 25 April – Meet your DCNR Service Forester hike
- 25 April – Friends’ adopt-a-highway cleanup of Forest Road
Presently, trails remain open for disbursed hiking. The park office and all park facilities are CLOSED. Please take sensible precautions.
A short documentary on how & why the State Park is protecting the Hemlock trees of Cook Forest from the Hemlock Woolly Adelgid (HWA) – and what it would mean if we lost that battle. Hemlock is a keystone species, irreplaceable. Eastern hemlock trees filter sediment and prevent stream bank erosion, and its evergreen boughs are integral for keeping streams cold enough for trout – hemlock streams average ten degrees cooler than waterways without hemlock.
The film is 22 minutes long, will be followed by a short Q & A session.
At 7 pm, all are welcome to attend a general meeting of the Iron Furnace Chapter #288 of Trout Unlimited, featuring speaker Ryan Borcz, DCNR park manager for Cook Forest & Clear Creek State Parks, discussing an in-progress stream habitat improvement the chapter is orchestrating in Clear Creek.
Both events are in Room 120 of the Grunenwald Science and Technology Center (STC), Clarion University of Pennsylvania – GPS Address: 909 E Wood St. Clarion PA, 16214. Free parking is available slightly downhill & across the street.
Clone your Favorite Native Plants:Join Ty Ryen, DCNR Bureau of Forestry Service Forester and Certified Arborist, for this FREE indoor event – a hands-on demonstration with hardwood cuttings, plus tips on timing your cuttings and mixing soil:
Saturday, 14 March 2020 – 11 am – 1 pm >> add event to your google calendarThis free event is open to all. The DCNR Cook Forest State Park office has generously donated their conference room for the gardening seminar – the address is 100 PA-36, Cooksburg, PA 16217, and the google maps code is 8QMR+59 Cooksburg, Farmington Township, PA.
a Penn State Forest Stewards series article – written by Jim Finley, Professor Emeritus, Forest Resources Management, Center for Private Forests at Penn State.
So far for most Pennsylvanians, Winter 2020 has been a non-event. Depending on where you live, temperatures are considerably above normal and snowfall below normal. Individual perspectives might lead to interpreting these two statistics as either positive or negative. No snow equals no shoveling. Warm temperatures equal more time outside. Or, no snow equals no sledding or skiing. Warm temperatures equal more ticks.
Thinking more broadly than personal values or needs; Is this winter’s weather a harbinger of a future driven by climate change? If so, how will Pennsylvania’s forests respond?
For sure, weather is fickle. Mark Twain purportedly said, “Climate is what we expect, weather is what we get.” It seems something is happening to the climate and, whether you attribute it to human activities or just unexplainable variation, Pennsylvania’s forests are facing challenges.
Forest Resilience in a Changing Climate
Aldo Leopold, a 20th century mid-western conservationist, and author of The Sand County Almanac and many other writings about our relationships to the land and natural systems, was a keen observer of change that others seemed to miss. He wrote, “One of the penalties of an ecological education is that one lives alone in a world of wounds. Much of the damage inflicted on the land is quite invisible to laymen . . . in a community that believes itself well and does not want to be told otherwise.” Simply, he was saying that the more one knows about ecology, the more apparent change is and that many will neither see nor believe that it matters. Many resource professionals as well as laypeople are seeing change in many areas of our environment. As Leopold suggests though, many of these changes and linkages may not be obvious to less than “keen observers.”
Disturbance and change are part of natural systems. Resilience is the ability of a system to recover after disturbance, which determines its ability to persist and function over time. The degree and extent of a disturbance logically affects the capacity of a natural system to recover. For example, in a typical winter, forests often experience damage from wind and ice. Most commonly this is local damage and a few trees experience broken limbs and some trees tip over. The ability of the forest to function across a larger landscape continues unabated – some trees benefit from increased light and growing space from the loss of their neighbors – the forest almost ignores the event.