Top Tweets for #InvasiveAlien
Unbranched Bur-Reed still unfurling in Little Ouse at Lakenheath Fen. Lesser Water-Parsnip also present in macrophyte base layer of this river that originates as a #chalkstream. Less welcome is #invasivealien Nuttall's Waterweed & the grim blanket of Cladophora glomerata. 10/11
The commonest fish in the Little Ouse at #LakenheathFen is #invasivealien European Bitterling, many males, though small, coming into breeding colours & spending a lot of time chasing each other around over the silty, freshwater-mussel-studded, shallows on the river margins. 3/11
A new occurrence of the #InvasiveAlien ant #BrachyponeraChinensis has been officially reported in Italy via NOTSYS under Reg. 1143/2014.
The report concerns the detection of the species in a new area.
Early warning systems and monitoring are essential to limit further spread.
The Cut-Off Channel at Wretton is carpeted in #invasivealien Zebra Mussels, esp clustered on any hard surfaces eg fallen tree trunk. They keep the water amazingly clear (even in absence of Daphnia swarms of 2 weeks earlier) but worry they'll obscure more prehistoric bones. 13/21
I always enjoy freshwater sponges (Spongillidae) in East Anglian chalk streams like the River Little Ouse, but not #invasivealien Signal Crayfish eg this deceased monster.
Common molluscs of these #rivers include Wandering & Common River (Viviparus viviparus) snails. 13/14
The Little Ouse at Lakenheath is patrolled by droves of Common River-snail (Viviparus viviparus). No idea what's going on with top one? Seems to have taken leave of its shell. Looks painful. The banks are sadly riddled with excavations of #invasivealien Signal Crayfish. 17/24
In Little Ouse, huge numbers of #invasivealien, but nonetheless, charming, Bitterlings, a few males still in breeding colours. Plenty Duck & Swan mussels into which they inject, via the siphons, eggs & sperm, so eggs can safely mature & hatch before fry exit via siphons. 16/24
Saw some fine Marbled (Pachygrapsus marmoratus) & Warty (Eriphia verrucosa) crabs at La Rรฉserve de Nice, as well as plenty of Rayed Mediterranean Limpets (Patella caerulea) & shells of the #invasivealien Pacific Oyster (Magallana gigas). #crustacean #molluscmonday 11/14
The macrophyte diversity of the River Lark upstream of Isleham marina was rather low. A few patches of Water Starwort & Perfoliate Pondweed, a Lesser Water-Parsnip (Berula erecta) & too many big banks of the #invasivealien Nuttall's Waterweed (Elodea nuttallii). #RiverLark 12/14
On Friday in River Rhรดne at Chemin du Moulin des Frรจre, glorious swim (19.6ยฐC) but useless snorkel, almost 0 vis due to inflow from Arve to crystal clear waters flowing from Lake Geneva. Saw only #InvasiveAlien Zebra mussels (dead?), Spiked Water Milfoil & a fish jump #MySwim 1/4
The Sapiston River/Black Bourn below Ixworth also suffers incredibly dense infestation of #InvasiveAlien Signal Crayfish riddling #river bed & banks with their holes. Another alien is tiny Jenkins Spire-snail (Potamopyrgus antipodarum). At least Great Ram's-horn is native. 5/10
Below the fish pass, did spot a colony of Sessilida ciliates & also the only #invasivealien Signal Crayfish I saw, though there was plenty of their holes riddling the river bed further upstream, which is where I found & removed from the #RiverLark an illegal crayfish trap. 10/12
This stretch of Cut-Off Channel Wretton had quite a lot River Water-Dropwort (Oenanthe fluviatilis), a few Fan-leaved Water-crowfoot (Ranunculus circinatus), lots #invasivealien Nuttall's Waterweed (Elodea nuttallii) & I wonder if these are leaves of Arrowhead unfurling? 8/15
Shocked to find #invasivealien Demon Shrimp (Dikerogammarus haemobaphes). With Cut-off Channel artificially flowing to River Lark, matter of time before it's invaded. It already has Signal Crayfish. Lots bright red Water Mites (Hydrachnidae).
Not sure what insects emerged?
7/25
The Cut-Off Channel's clarity - esp. amazing as it's flowing from Great Ouse (during times of flood it flows other way, from the Lark!) - is horrendous infestation of #invasivealien Zebra Mussels (top). How long before they smother the Swollen River Mussels (Unio tumidus).
6/25
Apart from Common Carp (Cyprinus carpio), the only fish we saw was this small, dead Roach.
Disturbed to find one group of what could be #invasivealien Zebra Mussels (Dreissena polymorpha) - which I've seen elsewhere in vicinity https://t.co/2aXxWXc42S. #MolluscMonday 3/6
Still plenty Swan Mussels to host Bitterling young, but for how long - #invasivealien Zebra Mussels colony in the Wissey under railway bridge. River bed sadly barren, due to clearance of vegetation for navigation? But riddled with huge Chinese Mitten Crabs & their holes. 4/10
13# Solenopsis invicta๐, the fire ant๐ฅ ๐https://t.co/RCiuDqbjfS, is an #invasivealien species of Union Concern, native to South America. These ants can build rafts ๐ถ when they feel the water level is rising, which could be one reason they spread so much!!โผ๏ธ๏ธ
Apart from fry, the only animal life I saw in 275 m of River Lark downstream of the noisome inflow, up from Gravel House, was #invasivealien Signal Crayfish.
Upstream, as well as wall to wall fish, there were Painter's Mussels (Unio pictorum). #chalkstreams #WorldRiversDay 3/10
The River Granta at Babraham is heavily infested with #invasivealien Signal Crayfish from America - all over the place, complacent with a sense of entitlement, excavating the banks for their holes. 1st one below has deformed claw. #Cambridgeshire #southcambs #signalcrayfish 9/12
Puzzled by the golden layer of life on surface of the silt banks. An algae?
Lake sponge (Spongilla lacustris) on shady tree roots.
In places, bank riddled with #invasivealien Signal Crayfish holes; the only one I saw was dead (only good UK Signal Crayfish is a dead one! 13/15
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