Surely Brocchinia reducta is carnivorous.

[didge]

I have been surprised to see that the Brocchinia genus does not have a position here among the list of fully-carnivorous plants. Yet Plachno & Jankun 2005 found that B. reducta does release a sulphur compound (a phosphatase) into its tanks that admittedly with the aid of microorganisms allows it to digest its prey.
Brochinnia hechtioides is also carnivorous.
Givnish TJ, Sytsma KJ, Smith JE, Hahn WJ, Benzing DH, Burkhardt EL. 1997. Molecular evolution and adaptive radiation in "Brocchinia" (Bromeliaceae: Pitcairnioideae) atop tepuis of the Guayana Shield. Pp. 259-311 in TJ Givnish and KJ Sytsma, "Molecular Evolution and Adaptive Radiation", Cambridge University Press
Of course not all brochinnia are carnivorous but not all nepenthes are either.

[Dave Evans]

What a curious statement...

Any chance you might be able to provide a list of non-carnivorous Nepenthes? To be honest, I don't know much about Brocchinia, but I know a lot about neps...

[ICPS-bob]

Ah, but there is a heading that includes Brocchinia:
Miscellaneous CP's (Triphyophyllum, Ibicella, Brocchinia, etc)
icps.proboards.com/index.cgi?board=miscellaneous

[didge]

Dave. herewith list as requested.
Nepenthes that have mutualistic relationships with mammals that are very probably more important to the species than their pitchers original arthropod trapping benefits.
N. lowii
rsbl.royalsocietypublishing.org/content/5/5/632.short
Nepenthes rafflesiana elongata
rsbl.royalsocietypublishing.org/content/early/2011/01/21/rsbl.2010.1141.full

[peterhewitt]

didge, in the same article it states that immature plants still exhibit all the trapping mechanisms of a Carnivore. Mutualism only becomes a factor when the plants mature.
My personal opinion is that since bat Guano and bird crap is also high in Potassium and Phosphorous, the plants might do this to facilitate flowering. Just my thoughts.

[peterhewitt]

In N.Rafflesiana Elongata, the bats only roost in the upper pitchers.
It strikes me that all these plants do this in the upper pitcher phase. Also the phase where flowering occurs.

[didge]

I must admit to be somewhat acting the devil's advocate here. With an interest in arboreal myrmecophytes I am aware that although their symbiotic association with ants has almost certainly been the driving force for the initial evolution of the tuberous rubiaceae taxa, there is emerging evidence that fauna other than ants are regularly utilising ant-house plants. This appears to be occurring primarily in climatic regions (e.g. highlands) where insects and especially ants are far less numerous compared to warmer climates. Evolution often finds new uses for its already evolved structures.