Abstract
Ants can have important, but sometimes unexpected, effects on the plants they associate with. For carnivorous plants, associating with ants may provide defensive benefits in addition to nutritional ones. We examined the effects of increased ant visitation and exclusion of insect prey from pitchers of the hooded pitcher plant Sarracenia minor, which has been hypothesized to be an ant specialist. Visitation by ants was increased by placing PVC pipes in the ground immediately adjacent to 16 of 32 pitcher plants, which created nesting/refuge sites. Insects were excluded from all pitchers of 16 of the plants by occluding the pitchers with cotton. Treatments were applied in a 2 × 2 factorial design in order to isolate the hypothesized defensive benefits from nutritional ones. We recorded visitation by ants, the mean number of ants captured, foliar nitrogen content, plant growth and size, and levels of herbivory by the pitcher plant mining moth Exyra semicrocea. Changes in ant visitation and prey capture significantly affected nitrogen content, plant height, and the number of pitchers per plant. Increased ant visitation independent of prey capture reduced herbivory and pitcher mortality, and increased the number of pitchers per plant. Results from this study show that the hooded pitcher plant derives a double benefit from attracting potential prey that are also capable of providing defense against herbivory.
Similar content being viewed by others
References
Altfeld L, Stiling P (2006) Argentine ants strongly affect some but not all common insects on Baccharis halimifolia. Environ Entomol 35:31–36
Atwater DZ, Butler J, Ellison A (2006) Spatial distribution and impacts of moth herbivory on northern pitcher plants. Northeast Nat 13:43–56
Awmack CS, Leather SR (2002) Host plant quality and fecundity in herbivorous insects. Annu Rev Entomol 47:817–844
Bronstein JL (1998) The contribution of ant-plant protection studies to our understanding of mutualism. Biotropica 30:150–161
Bronstein JL, Alarcon R, Geber M (2006) The evolution of plant-insect mutualisms. New Phytol 172:412–428
Chapin CT, Pastor J (1995) Nutrient limitation in the northern pitcher plant Sarracenia purpurea. Can J Bot 73:728–734
Clarke CM, Kitching RL (1995) Swimming ants and pitcher plants: a unique ant-plant interaction from Borneo. J Trop Ecol 11:589–602
Cresswell JE (1991) Capture rates and composition of insect prey of the pitcher plant Sarracenia purpurea. Am Midl Nat 125:1–9
Cresswell JE (1992) The morphological correlates of prey capture and resource parasitism in pitchers of the carnivorous plant Sarracenia purpurea. Am Midl Nat 129:35–41
Ellison AM, Gotelli N (2001) Evolutionary ecology of carnivorous plants. Trends Ecol Evol 16:623–629
Fischer RC, Wanek W, Richter A, Mayer V (2003) Do ants feed plants? A 15N labelling study of nitrogen fluxes from ants to plants in the mutualism of Pheidole and Piper. J Ecol 91:126–134
Fish D (1976) Insect-plant relationships of the insectivorous pitcher plant Sarracenia minor. Fla Entomol 59:199–203
Folkerts DR, Folkerts GW (1996) Aids for field identification of pitcher plant moths of the genus Exyra (Lepidoptera: Noctuidae). Entomol News 107:128–136
Frederickson M, Gordon DM (2007) The devil to pay: a cost of mutualism with Myrmelachista schumanni ants in “devil’s gardens” is increased herbivory on Duroia hirsuta trees. Proc R Soc B 274:1117–1123
Gaume L, Zacharias M, Grosbois V, Borges RM (2005) The fitness consequences of bearing domatia and having the right ant partner: experiments with protective and non-protective ants in a semi-myrmecophyte. Oecologia 145:76–86
Givnish TJ (1989) Ecology and evolution of carnivorous plants. In: Abrahamson WG (ed) Plant-animal interactions. McGraw-Hill, New York, pp 243–290
Givnish TJ, Burkhardt EL, Happel RE, Weintraub JW (1984) Carnivory in the bromeliad Brocchinia reducta, with a cost/benefit model for the general restriction of carnivorous plants to sunny, moist, nutrient-poor habitats. Am Nat 124:479–497
Heard SB (1998) Capture rates of invertebrate prey by the pitcher plant, Sarracenia purpurea. Am Midl Nat 139:79–89
Heil M, McKey D (2003) Protective ant-plant interactions as model systems in ecological and evolutionary research. Annu Rev Ecol Evol Syst 34:425–453
Jones FM (1921) Pitcher plants and their moths the influence of insect-trapping plants on their insect associates. Nat Hist 21:296–316
Letourneau DK (1998) Ants, stem-borers, and fungal pathogens: experimental tests of a fitness advantage in Piper ant-plants. Ecology 79:593–603
Merbach M, Zizka G, Fiala B, Merbach D, Booth WE, Maschwitz U (2007) Why a carnivorous plant cooperates with an ant: selective defense against pitcher destroying weevils in the myrmecophytic pitcher plant Nepenthes bicalcarata Hook.f. Ecotropica 13:45–56
Meyer R, Walguarnery J, Beaulac D, Brown T, Hughes K (2001) Morphological differences among two populations of the hooded pitcher plant, Sarracenia minor, and its usefulness as an indicator species for bog and seepage savanna communities. Osprey J Ideas Inq 1:9–12
Miller TEX (2007) Does having multiple partners weaken the benefits of facultative mutualism? A test with cacti and cactus-tending ants. Oikos 116:500–512
Miller TE, Kneitel JM (2005) Pitcher-plant inquiline community as a prototypical metacommunity. In: Holyoak M, Holt R, Leibold M (eds) Metacommunities. University of Chicago Press, Chicago, pp 122–145
Moon D, Rossi A, Stokes K, Moon J (2007) Effects of the pitcher plant mining moth Exyra semicrocea on the hooded pitcher plant Sarracenia minor. Am Midl Nat 159:321–326
Newell SJ, Nastase A (1998) Efficiency of insect capture by Sarracenia purpurea (Sarraceniaceae), the northern pitcher plant. Am J Bot 85:88–91
Oliveira PS, Rico-Gray V, Diaz-Castelazo C, Castillo-Guevara C (1999) Interaction between ants, extrafloral nectaries and insect herbivores in Neotropical coastal sand dunes: herbivore deterrence by visiting ants increases fruit set in Opuntia stricta (Cactaceae). Funct Ecol 13:623–631
Plummer GL, Kethley JB (1964) Foliar absorption of amino acids, peptides and other nutrients by the pitcher plant, Sarracenia flava. Bot Gaz 125:245–260
Rico-Gray V, Barber JT, Ellgaard EG, Thien LB, Toney JJ (1989) An unusual animal-plant interaction: feeding of Schomburgkia tibicinis (Orchidaceae) by ants. Am J Bot 76:603–608
Risch SJ (1982) How Pheidole ants help Piper plants. Brenesia 19(20):545–548
Rutter MT, Rausher MD (2004) Natural selection on extrafloral nectar production in Chamaecrista fasciulata: the costs and benefits of a mutualism trait. Evolution 58:2657–2668
Rymal DE, Folkerts GW (1982) Insects associated with pitcher plants (Sarracenia: Sarraceniaceae), and their relationship to pitcher plant conservation: a review. J Ala Acad Sci 53:131–151
Schnell DE (2002) Carnivorous plants of the United States and Canada. Timber Press, Portland
Solano PJ, Dejean A (2004) Ant-fed plants: comparison between three geophytic myrmecophytes. Biol J Linn Soc 83:433–439
Trager MD, Bruna EM (2006) Effects of plant age, experimental nutrient addition and ant occupancy on herbivory in a neotropical myrmecophyte. J Ecol 94:1156–1163
Zachariades C, Midgley JJ (1999) Extrafloral nectaries of South African Proteaceae attract insects but do not reduce herbivory. Afr Entomol 7:67–76
Acknowledgments
This project was funded by the Coastal Biology Program at the University of North Florida. The manuscript was significantly improved by the comments of Peter Stiling and three anonymous reviewers.
Author information
Authors and Affiliations
Corresponding author
Additional information
Communicated by Diethart Matthies.
Rights and permissions
About this article
Cite this article
Moon, D.C., Rossi, A.M., Depaz, J. et al. Ants provide nutritional and defensive benefits to the carnivorous plant Sarracenia minor . Oecologia 164, 185–192 (2010). https://doi.org/10.1007/s00442-010-1670-9
Received:
Accepted:
Published:
Issue Date:
DOI: https://doi.org/10.1007/s00442-010-1670-9