Back at Als Bachous

By Lesley McLaren

Despite best intentions last September, the first time I returned to Als Bachous since then was a week ago. As soon as I got out of the car, it was evident that there has been a lot of human activity. And some, at least, is welcome.
 
At first I was aghast to see great heaps of earth at the southern end of the former eastern quarry (now marshland). I had to go and investigate straightaway, and scrambled up the bank separating marsh from lake. There’s just a single line of mounds, but no sign of any fresh quarrying – the marsh, which I explored last time, is still exactly as was. I couldn’t really tell, therefore, where all the earth must have come from to create such spoil heaps. Unless it's been imported? If so, for what purpose? It occurred to me that the GOR might be trying to tempt bee-eaters to breed here again. But the heaps look much too stony to me, so I think I can rule that out.

Looking across the eastern marsh (former quarry) to new soil heaps

More heartening was the sight of additional efforts made since my previous visit, to prevent vehicle access all round the lake. By ploughing! The wide track on the far side has been completely dug up, and earth barriers created across it in places. 4x4s, quads and scooters might still cope with it, but it should deter most people. A single car-width of track has been left down the east side of the lake, but passing and parking is now difficult owing to the ploughed 'verges'. Nevertheless one determined fisherman was installed along there beside his van when I walked past. They’ll have to keep ploughing, because rain – and more daring drivers – will gradually flatten the soil back down. But it’s a great improvement and the whole area was very quiet. Perhaps this is linked to the mounds of earth – in which case work must still be very much in progress. I was relieved that there was no activity of heavy machinery while I was there.
 
Down in the eastern marsh it was indeed soggy. Tadpoles were active in water-filled ruts, and insects were on the increase, including speckled wood and orange tip butterflies. There were fewer birds than I expected, but I did see one fan-tailed warbler, and heard several Cetti’s (neither of which migrate). At the foot of the GOR notice about amphibians and dragonflies, spraint on a stone looked to have bone fragments in it – possibly left by otter or mink.
 
At the Tech, it was good to see the river running well. Although not especially deep, it would have come to my knees at least, had I tried to wade across to the islet I stood upon in September. From my position on the bank, even with binos, it was impossible to see if there was any fresh otter spraint – my main objective for the day.

It proved equally impossible to spot any of the several Cetti’s warblers that were taunting me with their explosive song. I wondered if the old nest in this low bush on the islet was made by a Cetti’s – quite probably, I think.

At one point a small blur of brown flew into a bush only a few metres away, immediately disappearing behind leaf buds. That had to be one. I waited for some minutes, camera poised for when it would reappear, which it must eventually. Surely? Nope. Only when I gave up and moved, did it bob into sight for a nanosecond, before flying into deep cover on the opposite bank. One day I'll get a proper look at one.

That morning I had to content myself with watching a group of mating pond skaters, close to the bank. They seemed unbothered by me hovering close above them, but getting a photo in focus was near-impossible because they were constantly on the move, rowing at high speed with those super-long middle legs. I've read since that the males, which are rather shorter than the females, die after mating. Females, on the other hand, have two breeding cycles in a year. Lucky for some!

This female is multi-tasking - eating a moth while mating.

Back at the lake, the island in the middle looked starkly white with guano – which it always does before the leaves return on the trees.

At the start of my walk I'd picked out a couple of night herons on there, as well as grey herons and sunbathing cormorants, but on the way back, something black and glistening caught my eye at the water’s edge on the south side. Some kind of animal? Binos confirmed a terrapin. Three, in fact. After a few minutes two more crawled out of the water, and by the time I’d walked on a bit, there were seven. Not far above them, one of the grey herons stood motionless among bamboo canes. I hoped it would consider them too big too tackle, and certainly, at least while I was watching, it paid them no attention.

Scanning further along the water's edge, my binos picked up a biggish-looking burrow and a strip of bare earth to its right, which looked as though it led to another hole. The fresh looking soil and lack of plant debris seemed to point to these being active, not old and disused. And, presumably, whatever lives in them must be a swimmer ... with a penchant for fish perhaps?

Apologies for such an over-exposed shot - the only way to make the holes visible.

Although an island burrow should be safe - especially from human disturbance in this lake - somehow I suspect an otter holt would be better concealed. I feel it's more likely that these belong to coypu or mink - but really don't know enough about any of those species.

If I do return around dawn one day, perhaps I'll start observations at that point, before heading for the river. The clocks go forward tonight, so sometime over the next few weeks would be ideal for an expedition like that - before it gets too difficult to throw myself out of bed in the dark. In any case, I need to return soon, to see if there have been any developments with those mounds of earth.