What a Difference a Rain Makes: The Dinky Track

The view looking south from the center of the 100-acre Dinky Track earlier this week

Barring a catastrophic dike failure (which we thankfully did not and should not experience), the thought that a single rain could cause flood damage to a wetland might sound strange. But the last line of my July 16, 2017 post (the day we flew seed over 50 acres of the Dinky Track) was pretty prophetic . . . to continue the biblical theme . . . "P.S. Thunderstorms are in the forecast again for this afternoon."

Just a few short hours after the seed rained down out of that plane, the actual rain came down. And it came down in big drops, close together. The thunderstorm was sustained and within a few short hours more than 2" of water fell. Usually, this wouldn't cause major problems with a millet seeding when water can be taken off a unit. But because we were just on the jagged edge of "dry" enough and because we couldn't get it dry quickly enough (in part due to extremely soft sediment holding moisture), we've now come to discover that much of the seed rotted. The landing strip of relatively bare mud above is a testament to too much water at just the wrong time.

Per usual in marsh management, one has to take some
bad (e.g. Swamp Loosestrife, above) with the good;
such is life in a world riddled by invasive species

But as is so often the case in nature, there is a silver lining. We had a hunch that the Dinky would respond differently to a late drawdown as compared to the adjacent Tower Marsh. That's why we flew millet onto 50% of the Dinky versus more like 15% of the Tower. What we didn't anticipate is that both units would show positive responses from the seedbed (the seeds naturally residing in the shallow soil).

Based on our hike earlier this week, the Dinky has much of the same nut sedge that we are observing next door (a good thing). Where the millet is lacking, we are also seeing other good pushes of smartweed and beggerstick (more good news). There are also some hints at some desirable perennials -- most notably soft-stem bulrush (again, a good thing).

We knew we were going to be dealing with some invasive loosestrife, both purple (below) and swamp (left, and in isolated stalks to the right above). As we discussed from early on, the purple is largely being held in check by a friendly beetle. There are a couple initially daunting stands in the Dinky now, but as the photo below illustrates well, the beetles are doing their jobs. And as for the swamp loosestrife, they are really only prevalent on the very tops of old, rotting root clumps (on "high ground" islands no more than 18"x 18"). We are scratching our heads a bit as to the best management approach with these buggers (no, the beetles have no appetite for swamp loosestrife), but the good news is, they don't tend to spread overly quickly, and they are really only sporadically present in most of the unit.

A fairly sizable (~1 acre) stand of purple loosestrife trying to establish within Phragmites that was sprayed in 2015;
note browning and highly stressed plants in middle of frame (being attacked by the Galerucella beetle) and the
bright-colored plants behind -- in the cue to be consumed/killed

Bidens, or beggersticks, can be a bit of a nuisance when wearing fleece or neoprene (seeds stick to everything) --
but the ducks happily feed on them come fall, so we welcome their presence in the natural succession plan

Roy estimates he saw as many as 1,000 shorebirds (big numbers but not huge diversity) earlier this week;
rain in today's forecast might make Friday's viewing worth breaking out the field guide and camera -- to be continued

I could go on and on cataloging the plants we are seeing now and the various outcomes that could evolve. But as Roy keeps saying, "This is a one week at a time proposition." We watch the weather, watch the response, and adapt accordingly.

Dry Enough for a Walking Tour: The Tower Marsh

Changes are literally visible by the day when it comes to what is growing in the Tower Marsh at present; and the tiny seedling starts in the foreground are a surprisingly positive indicator of what might be to come (click to enlarge)

The Tower Marsh, an 85+ acre expanse that hasn't been much but shallow water (12-30" deep) ringed in Phragmites since we took possession of the property, is in the midst of a change that hasn't been witnessed in decades . . . like maybe three. For the first time since the '80s (we think), this management unit is dry enough to walk on foot.

Periodic (~weekly) rains over the last couple/few weeks have saturated the mud on at least a couple occasions. Last Friday, for example, a 0.5"+ of rain covered the expanse shown above with skim water in the morning, only to see it evaporated and/or absorbed by afternoon. This makes for some sticky walking in places, but it is the perfect incubator for a late season drawdown.

As I've written about in the past, we seeded the eastern ~10 acres of the unit with millet just a short month ago (a few weeks later than we had originally intended). The result of that seeding appears as the very light green in the background of the photo above. A shot "from the weeds" is included below. This introduction of millet was intended to create desirable cover along the Phragmites-dominated eastern dike, while leaving the majority of the new exposure prone to whatever resides in the seedbed. Our fingers have been crossed and based on our initial discoveries, we're excited!

The eastern end of the Tower is now a far cry from bare mud; it has been exposed the longest and is now dominated by a nice mix of millet (flown in), nut sedge, and soft-stem bulrush (seedbed generated) -- these areas are now supporting plants 12-18" tall

A closeup of the area above shows just what we were hoping for -- a healthy mix of "fruit"-bearing annuals (nudge sedge, pictured to the left) and even some desirable perennial species.

If you click on the image to the left to enlarge, you may be able to make out the rounded, darker stems of soft-stemmed bulrush. The largest of these plants are getting close to a foot and a half, but most are <12" and can be quickly covered in the more aggressive annuals. The good news is they are there, and they are taking root.

The other good news is that even on bare mud, the bulrush is present. In fact, it really seems to be the dominant plant in areas where water has just receded. Seedlings that are <3" tall can be difficult to identify to species, but with some experience and a good camera, you can train your eye to ID the usual suspects.

Below, I have included just a few select photos from of the other discoveries from our hot walk onto the mud. I'll try to detail what we found on the far east unit (the "Dinky Track") soon. While we implemented a similar management tactic, things are looking markedly different over there.

Demonstrating its propensity to germinate about anywhere that it can find a foothold, these two individual Japanese 
millet seedlings are joining a handful of bulrush on the inside curve of a decaying snapping turtle shell

Even one of my favorite wetland plants, arrowhead, is showing itself in very isolated clusters in the Tower

This perspective is most striking because two seasons ago it was a sea of Phragmites 10-feet tall or more; the sun-faded sticks and one isolated plant are all that remain after an aerial herbicide treatment (late August 2015); with the water now down, we are seeing the immensely positive response from the millet, nut sedge, and bulrush

Did Someone Say Mud?

My post from earlier in the week set the stage for what we are experiencing now in on the East Marsh. All our water management over the last several months has finally allowed us to reach our goals, and we are experiencing the extensive "late season drawdown" that we established as our primary 2017 restoration objective for nearly 200+ acres of marsh.

The vegetative response will be very interesting to watch. If we like what we see, we let it ride. If we don't, we always have the option of re-flooding one or more of the management units and essentially starting over.

But one thing we definitely can see is that the timing of our newly exposed mud is setting the stage for what we hope will be a bonanza of shorebirds. Dozens of species like the one pictured to the left are specifically adapted to capitalize on these situations. Their feet are typically long and well suited for "snowshoeing" through the wet mud, and long legs don't hurt anything when the mud is soft and the bugs are plentiful.

What amazes me most about this group of birds? (1) Their diversity [I have a lot to learn to differentiate all the subtleties that differentiate the species]; (2) Their ability to find and exploit new mud [they seem to appear out of nowhere the instant water goes away]; and, (3) Their metabolism [most of these species seem to never stop moving!]. Identification is tough (I'm always looking for positive id's from those who know more than me), but photography can be even more challenging. We hope to spend more time in the marsh with a camera over the days and weeks to come.

This medium-sized hunter of the shallows let me get pretty close yesterday while I was photo monitoring.
Can anyone ID?

Just like shorebirds, bird watchers seem to appear out of no where as soon as new opportunities arrive. I witnessed six vehicles and nearly a dozen individuals armed with scopes and telephoto lenses on the roadside to the west of our East Marsh late on Wednesday afternoon. Word is out that we have "fresh mud." Seasoned birders are well aware that the shorebirds are sure to follow.

For perspective, here are some comparison photos from the same vantage points: June versus August. The "after" shots were just taken yesterday.

BEFORE: Very sparse emergent vegetation and turbid water dominate in the Tower Marsh; June, 2017

AFTER: Millet and other annuals are beginning to fill in opportunistically thanks to the dry conditions that are conducive
to germination; August, 2017

BEFORE: Broad expanses of shallow water dominate the 100-acre Dinky Track, leaving little but dead and decaying
loosestrife clumps in the background; June, 2017

AFTER: The same perspective following drawdown -- shorebird activity is picking up and so is the germination of new
annuals in the mud; August, 2017