Saracenia flava with soon-to-be dinner.
Way back in 1976, a group of researchers extracted coniine, a narcotic drug, from the nectar of Sarracenia flava. Using the fire ants (Solenopsis invicta) as test subjects, they demonstrated that the amount of coniine in the nectar was sufficient to paralyse the ants. While I can’t access the original study online, I have often wondered what effect the coniine has on prey capture? (NB – the amount of coniine secreted by Sarracenia is not anywhere near enough to affect humans!).
Over the past couple of seasons, I have made some interesting observations with butterflies and moths coming to my Sarracenia. Last season, I watched a number of adults of the dayflying grapevine moth (Phalaenoides glycinae, Noctuidae sensu stricta: Agaristinae) drink the nectar of Saracenia leucophylla x psittacina pitchers (see photo above).
I was bemused that these moths would be attracted to Sarracenia, but became more intrigued when I found them alive but very intoxicated on the surface of the Sarracenia pots. When I picked them up, they barely but up a struggle, strange for such a strong flying (and often hard to catch) moth. However, they were never trapped by the Sarracenia hybrid they drank from, as the opening is too constricted for the moth to get inside. It was always this hybrid they were feeding at too – I never saw them at any other Sarracenia.
Now, fast forward to this season.
Over the past few days, we have had Common Brown butterflies (Heteronympha merope merope, Nymphalidae: Satyrinae) make their first appearance in Canberra. The above photo shows a male specimen, which are more conspicuous than females at this time of year.
Here is where I found one today (plant is an S. leucophylla ‘Tarnok’):
What is impressive here is the relative sizes of the common brown butterfly…
and the pitcher that caught it…
As you can see, males of the common brown have a wingspan nearly twice the size of the mouth of this S. leucophylla pitcher. In fact, the specimen I photographed (from Tenterfield, NSW), is a little smaller (and paler) than the ones I often see here in Canberra.
And yet, this leucophylla managed to snag one. Sure, with its wings folded above its back, the butterfly could fall in, but the feeding behaviour of these butterflies is such that they usually settle head up, on top of the flower they are feeding on, and rhythmically open and close their wings while they feed. Once inside the pitcher, I think the butterfly’s struggling would suck it further down the pitcher, but I really wonder whether it would fall in on its own.
Perhaps the leucophylla had a little help from some coniine?
I will keep watching what goes on with insets around my Sarracenia over the summer and see if I can photograph some interesting encounters.