Forests vs trees vs...nothing?

 This past week, September 19-25, was National Forest Week. There is no question that forests are important as part of the Canadian landscape. But to travel through most of Chatham-Kent (CK), one would not recognize forests as being important at all. CK has about the lowest amount of forest cover of any municipality in Ontario, at about 3-4%, and that is being generous. Some people consider any tree cover, such as recent plantations and hedgerows as legitimate forest, but that is really stretching it. Even much of the real forest cover that still exists in CK is not in great condition, as water tables have been altered, they have been influenced by agricultural chemicals, there has been the arrival of invasive species, almost every woodland has undergone some logging, some of it heavy, etc.

A good quality forest has a tremendous positive impact on the local, and even more distant, environment. It stores water, preventing flooding and keeps harmful chemicals out of things like the Thames River and water bodies downstream, all of which are sources of drinking water for parts of the human population, not to mention the better quality water that the natural wildlife requires.

Residents of CK and adjacent municipalities might have vivid memories of the most recent serious flooding which took place in February, 2018. These photos were taken from the general down town part of Chatham.

Forests reduce soil erosion, with the top layer being most important for crop production and thus reducing the extra costs of adding artificial fertilizers, part of which will wash away into the downstream areas thus negatively affecting water quality. Soil erosion is a serious problem. Here is an example of severe erosion which happens all too often: a tilled field, with a bit of snow on top and then covered with wind-blown soil from a nearby field.

Forests are also important for storing significant amounts of carbon, which helps alleviate increased temperatures associated with climate change.

The lack of forests obviously has a huge impact on our native wildlife. Southwestern Ontario has arguably the greatest biodiversity of native flora and fauna in Canada, even in its present state. But many of those species are rapidly dwindling. The greatest number of species at risk occur here in the southwest, in part because there are relatively few places for them to occupy.

In recent years, there has been a lot of effort by local people in CK to try and get a Forest Conservation By-law in place, to protect the remaining woodlands and prevent scenes like this.

 But it has been met with lots of opposition by a few landowners who don't want anyone to influence what they can do with the woodlands on their land. Some landowners are really good stewards of the natural resources they have, and credit should be given for their efforts and foresight. However the ones most vocally against such a by-law are apparently more interested in short-term profits than the long-term benefits of woodlands. Admittedly if the local council had put a by-law in place decades ago, like the majority of other southern Ontario municipalities, there would be more woodlands in CK and so the responsibility would not fall on those landowners who still have some.

I'm not against agriculture. I grew up on a farm in CK, and I get it. And I am not suggesting that landowners should bear the brunt of maintaining woodlands totally. If it is good for the community, then the community should ante up support to relieve any financial pressure on the landowners. One of the reasons that remnant forest are even more valuable nowadays is because so many landowners of yesteryear got the jump on the action, removing many hectares of forest since settlement.

There are some who have taken it upon themselves to plant trees, either as a hedgerow or even taken out some perhaps less productive farm land and put in a plantation. While these are useful, they are very small steps towards maintaining quality woodlands.

One must consider the huge differences between planting say, 5 acres of trees versus retaining a 5 acre woodland. There really is no comparison, and won't be for decades, even centuries. It is even hard to know where to start when considering the differences. But consider the following.

A good quality forest will have:

• high diversity of tree and shrub species
  

• impressive displays of spring wildflowers

 

Long-spurred Violet

Large Yellow Lady's-slipper

White Baneberry

• interior forest, meaning they will have good forest habitat a minimum of 100 metres from any edge. Some knowledgeable bird specialists maintain the minimum distance should be 200 metres. There are forest interior bird species that will not nest in any forested habitat that doesn't have interior forest, and also there are edge species of birds such as Brown-headed Cowbirds, which lay their eggs in other species' nests and out-compete the other nestlings. More on this may be the topic of another blog.

Acadian Flycatcher, an Endangered Species

American Redstart, an interior species

Scarlet Tanager, primarily an interior species

• large trees interspersed with younger trees.

• natural variation in the topography, resulting in parts of the woodland being upland and a bit drier, and other parts being a bit lower resulting in lowland forest habitat. This increases the diversity of the forest and creates water retention areas and habitat for other species such as reptiles and amphibians.
  

Blue-spotted Salamander

• fallen trees. Decomposing trees laying on the forest floor for a decade or more are known to host many more species of flora and fauna than a healthy, standing tree.

• fallen trees where their roots have been ripped up, leaving a shallow depression in the soil where the roots once were. These shallow depressions serve as important small habitats for things like amphibians and insects to survive. They also hold water for nearby plants to tap in to when they need it.

Eastern Grey Treefrog

• a good diversity of fern species. Ferns seldom grow in a poor quality forest, and especially not in plantations.
  

• standing dead trees, important for numerous insects which are critical in the decomposition process, and are in turn important for woodpeckers as a food source. Such trees in the earlier stages of death and decomposition are also good for nesting cavities for species such as woodpeckers, and other birds such as Prothonotary Warblers and Great Crested Flycatchers which may nest in these cavities when the woodpeckers are finished with them, or owls that use them for roosting in.

Pileated Woodpecker

 

•  a good diversity of fungus. Most people don't pay much attention to fungus, unless they are really vivid and colourful, but any fungus you see above ground is usually short-lived. The fungus you see above ground, or growing on a fallen log, is just the 'fruit' of the rest of this plant. Most of the fungus is below ground, greatly involved in the decomposition of whatever it is growing on, recycling the nutrients into small enough elements so that other living things can use them. The below part of the fungus is made up of tiny threads called mycorrhizae, which are not only connected to dead plant material as they decompose it, but also to many of the living plants such as trees, and are a tremendous source of food for living plants. Without fungus, most trees, shrubs and wildflowers would have a much more difficult time to even survive, let alone thrive.

Chicken-of-the-woods

Turkey-tail

Overall, the greater diversity of flora and fauna there is in a woodlot, the more stable it is, and will be more able to withstand the difficulties it must face over the years, whether it be an invasive species infestation or extreme weather conditions.

 This certainly has been borne out with examples of plantation planting in CK and elsewhere. In the last century or so, there have been many plantations established in southern Ontario. Most were planted as conifers, such as spruce or pine, especially if they were on the more sterile and well drained sandy soils. The spruces used were not naturally occurring in southwestern Ontario, but were a good start in some ways. The spruces were used as a 'cover crop' essentially until native hardwood species might arrive and become established many decades later, if there was a naturally occurring source of seed nearby. In the 1980s, local forestry staff thought that skipping that 'cover crop' stage and directly planting native hardwoods, such as ash trees, would speed up the process. It was a great idea and initially had some success. However most readers will know the longer term outcome. The non-native Emerald Ash Borer (EAB) arrived about two decades ago, and quickly killed most ash trees in southwestern Ontario. It has now reached more northerly and easterly parts of the province.

Here is a recent photo of an ash plantation that was established in about 1989. While parts of it are still alive, with ash trees that suckered after the main stems were killed by the EAB, and nearby tree species started to come in, it is anything but a good looking plantation and likely never will be, assuming it lasts for another century or more. I know of other ash plantations planted at the same time which suffered heavy damage by the borer and were completely removed and turned back into an agricultural crop on the poor quality soils.

Here is an example of another plantation effort in CK also established in the 1980s, this time of Black Walnut.  Clearly they are still alive, and haven't been affected by an invasive insect such as the Emerald Ash Borer. Maybe this plantation will survive. Some people would consider this as part of the 3-4% forest cover in CK, and from an aerial view, it does sort of qualify. But as a good quality functioning forest? Not even close!

The trees are fairly uniform in size due to their similar age. The diversity is non-existent, as it is a single species planting, although it is native. What is really telling is what is growing under the tree canopy. It is primarily, if not entirely, made up of non-native species, with a lot of grasses. While some of the visible wildflowers may be pretty, they are Purple Coneflower, a tallgrass prairie species not native to Ontario. And herein lies the problem. Precipitation is taken in primarily via the roots of the trees. Grasses create a dense sod, and intercept most of the precipitation before it gets to the tree's roots. depriving the trees of needed moisture in which to thrive. Although the trees themselves are around 35 or more years old, most of the trunks are spindly for their age. They have not grown anywhere close to their potential given the full sun and no competition from other tree species. It will take many decades, even centuries, if ever, for this plantation and others like it, to even begin to look and function as a forest. And with the current high value placed on Black Walnut for the furniture industry, chances are it will be cut down in several decades, assuming the trees will get to merchantable size.

One of the most difficult things for a plantation type forest to overcome is the lack of critical mycorrhizae in the soil, a very important but fundamentally necessary component of productive soil as described above. Years of agricultural disturbance, from annual tilling, compaction of soil due to heavy equipment as well as the addition of chemicals, whether they be fertilizers or for weed control, have destroyed the mycorrhizae.

 The only responsible solution is, for starters, to protect and retain the limited forest habitat still surviving in Chatham-Kent. Plantations adjacent to these forests will have a much better chance at becoming functional decades before a stand-alone plantation, as the seeds from the functioning forest will gradually enter the plantation. Will the current elected officials decide on a Forest Conservation By-law that is in the best interest of all citizens as well as the numerous species of flora and fauna that are struggling to survive in these habitats? Or will they capitulate to a small number of individual landowners in opposition to such common sense, as so many of their predecessors have done in the past? Only time will tell.

 

 

 

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Rondeau on the last Sunday of April

Yesterday (Sunday) was another great day of weather for hiking......not so great for seeing lots of birds. The Ontario Field Ornithologist's group had its annual late April trip, and the ~30 participants reported seeing 79 species which included a trip to the Blenheim Sewage Lagoon. The trails of Rondeau are getting busier with birders as the days go by, and with the decent weather, birders expect to see lots of birds. But the incessant east or northeasterly winds do not bode well for many birds to interrupt their northward migration to stop in at Rondeau. Hopefully that may change in the next couple of days. I know I've said that before, but one has to be optimistic!

As much as I like seeing lots of birds, and rare ones too, I enjoy just being out and taking whatever comes along. It may be the usual species, the not-so-popular species, the wildflowers, fungi, insects, herps (collectively reptiles and amphibians) or mammals. Or the behaviour that some of these species exhibit. Or the diversity of shapes and colours that the natural world has in abundance. And if I can capture some of this by camera, so much the better.

I prefer the quieter trails, where wildlife is more likely to be present, or at least not as likely to be put off by numerous or noisy people. Some trails and some parks get so busy that you feel like you are shuffling along in a grocery checkout line!

On this past Sunday, the South Point Trail looked quite busy. So I parked at the Visitor Centre just as many more vehicles were arriving, grabbed my camera gear and headed off....not on a trail, but westward on Gardiner Ave, crossing the same sloughs that the Tuliptree Trail crosses, then north on the closed (to vehicles) section of Rondeau Road, east on Bennett Ave, then south on the closed section of Harrison Trail, back to the Visitor Centre. During that hike of approximately 6 kilometres, I saw 4 cyclists and two joggers, and not a single other birder.

I came across two male Hairy Woodpeckers displaying and trying to establish ownership of a bit of forest territory.

Hairy Woodpeckers, at least in southern Ontario, seem to be on a bit of a decline in the last couple of decades. I attribute it to an increase in the number of Red-bellied Woodpeckers which, up until the 1970s, was an exceedingly rare species here, but is now more widespread and abundant than Hairy W/p.

As I stood motionless along the road at the edge of a slough, a pair of Canada Geese swam up to within 15 metres of me, and much too close for my telephoto lens. I wish Wood Ducks were so tolerant!

A little further along, a single Turkey Vulture was perched high in a dead oak tree with its massive open branching.

It must have been there for awhile, for as I was walking past, it must have felt the urge for its morning bowel movement. Fortunately I was a little beyond its range :-)

I saw the usual array of kinglets, creepers, Hermit Thrushes and Rusty Blackbirds. I heard the tremolo trumpeting call of one or more Sandhill Cranes off to the southwest in the marsh. And I had a brief glimpse of my first of year Swainson's Thrush.

By the time I got back to the Visitor Centre, the crowds had subsided, so I ventured onto the Tuliptree Trail. Some hikers were well ahead of me, but in my choice to amble slowly and watch carefully, I never caught up to them, and no one else came along in the hour or so I spent on the trail. Birds were few....a Wood Thrush had been seen by one or more parties earlier in the day, but I never caught up to it. A Winter Wren was there, in its usual spot. A small number of Rusty Blackbirds continued to forage at the edge of the larger sloughs. And the nesting Canada Goose (photo posted in previous post) was incubating its eggs, neck outstretched and trying to look as inconspicuous as possible. From along the northwesterly boardwalk, I glimpsed some movement at the water's edge. It looked at first like a muskrat, but muskrats are not often found in that habitat. A closer look, and I was surprised to see a Mink!

I watched it for about 10 minutes as the lone observer......no one else was within earshot or viewing distance, so by moving quietly, I was able to capture a few shots. It was heading in the general direction of where the Canada Goose was nesting, and had the Mink gotten a whiff of the delicacy that was available, there would have been no end to the commotion! However the weasel got close enough to me to realize that it didn't have the slough environment to itself, and so it made an about face and headed back in the general direction it came from.

Mink are quite capable swimmers, and can dive underwater for short distances. On occasion instead of climbing onto or going around a tree root, it chose to dive under it.

Just past the northwesterly boardwalk, I encountered a male Brown-headed Cowbird. This species is not particularly unusual, in general, but I was a bit surprised to see it so far from the entrance to the trail. They are generally considered an edge or open habitat species. The place where I saw it would be considered, in the ecological scheme of things, in what is known as 'interior forest', which is typically forest that is at least 100 metres from the edge, and relatively safe from edge species. Cowbirds are, of course, notorious for not building their own nests, but instead lay their eggs in the nests of other birds whose eggs are more or less a similar size. The young cowbird usually hatches a little sooner than the young of the host species, and will get all the food that the adults bring. A nest that successfully raises a cowbird will have no surviving offspring of the host species. This is a fascinating topic that could involve a lot of discussion, which I won't take time to go into on this post. Suffice to say that normally forest interior bird species such as Red-eyed Vireos and Acadian Flycatchers are relatively safe from the parasitic behaviour exhibited by cowbirds. But if cowbirds do intrude into interior forest habitat, then those other species are at some risk.

On the way to the north end of Rondeau, I stopped in at McArthur's cottage to see if the Yellow-throated Warbler was around. I had stopped earlier in the day (and week) as well, but on all occasions, although there was lots of bird activity of the usual species, no Yellow-throated Warbler appeared. But Common Grackle, Red-winged Blackbird, Chipping Sparrow, Song Sparrow, American Goldfinch, both nuthatch species, Blue Jay, Downy Woodpecker, Red-bellied Woodpecker and Mourning Dove were all coming and going, gorging on the available seed. A single American Tree Sparrow seemed a little late, but given the late arrival of spring, maybe not so much!

 

Sure they are all relatively common species, but are interesting in their own right.

I next stopped at the north end of Harrison Trail. I had White-eyed Vireo here a couple of days ago, and it was reported again earlier today. But unless it is singing, it can be quite difficult to detect as it flits furtively through the shrubbery.

I noticed some raptors moving, and photographed this adult Red-tailed Hawk.

At the log pond, all was quiet except for a single Blue-headed Vireo busily feeding in a fully flowering willow tree on the far side of the pond. Too far for any photos, but nice to see it as the first one of the year for me.

An adult Cooper's Hawk was being harassed by Blue Jays.....it likely has a nest nearby, but I didn't detect it.

A brief stop at the Spicebush Trail led to long chats with several birders I knew. One of them showed me a photo of a Baltimore Oriole which had appeared at his feeder earlier in the day just north of the park. In the time we spent in the parking area, there wasn't much bird activity, and those coming off the trail confirmed the quiet, so with only the occasional Hermit Thrush and a brief appearance of a Pileated Woodpecker, complete with its drum-roll and distinctive vocalizations, I decided to go elsewhere.

The final stop for the day was the north end of the Marsh Trail. There was less wind, and lots of light, which had its advantages for insect and bird activity and hopefully photography. Song Sparrows and kinglets were about all the land birds I could muster, so I spent some time being entertained by Common Terns. There were several of them going back and forth over the quiet, shallow water along the trail, and every once in awhile they would go into hovering mode, then make a quick plunge after a minnow. They were mostly back-lit, however, making for some challenging photography. I will have to make the attempt to be here much earlier in the day under similar conditions.

The lower photo was taken just after the tern emerged from a plunge....you may be able to see some water droplets trailing behind, as it shook itself before moving on.

One cannot go along the Marsh Trail anymore without being distracted by the ever increasing number of wind turbines across the bay. They are supposed to be a minimum of 500 metres from either the lake or bay edge, and in all likelihood they are. However they are such huge, imposing structures that they dominate the landscape. Again, the lighting wasn't great, so this photo only shows a few, back-lit ones taken with the equivalent of a 700mm telephoto lens. But the previous time I was out, from the lowest level of the observation tower I made a count and, looking from east to west, could see parts of as many as 180 turbines across the bay!