Abstract
The relative importance of intraspecific, interspecific, and seasonal causes of larval mortality were investigated for aquatic larvae of the giant damselfly Megaloprepus coerulatus in Panama. These larvae live in water-filled holes in fallen and living trees, where they and three other common odonate species are the top predators. By mid wet season, M. coerulatus larvae were found in nearly half of all tree holes that harbored odonates. Although M. coerulatus were typically, but not always, eliminated from holes inhabited by larger hetero-specifics, M. coerulatus were more likely to encounter conspecifics than other odonate species. Hole with less than 11 of water rarely contained more than a single larva. In large holes where M. coerulatus was the only odonate species present, multiple larvae coexisted at a density of one larva per 1–21 of water. There the absence of 2–4 of the 5 larval size classes, despite a continuous input of eggs, suggested that cannibalism was a common cause of mortality. The size of the final instar, which determined adult body size, was correlated positively with tree hole volume for male, but not female, larvae. Experiments showed that when two larvae were placed together in 0.4–1 holes with abundant tadpole prey, the larger larva killed the smaller one. Often the larva that was killed was not eaten. Small larvae were more tolerant of each other than were pairs of medium or large larvae. Before killing occurred, the presence of larger larvae reduced the growth of smaller individuals, relative to controls. ‘Obligate’ killing was density-dependent. In 3.0–1 holes with ad libitum prey, conspecific killing occurred until the larval density stabilized at one larva per 1–1.5 I, similar to the density found in large holes under field conditions, For M. coerulatus, cannibalism functions to reduce the number of potential competitors for food in addition to providing nutrition. When interactions between paired larvae in small holes were experimentally prevented, competition for food reduced the growth of one or both larvae relative to controls. Holes that were watered during the dry season supported larval densities similar to those in the wet season. Thus, dry season mortality could not be attributed to a decrease in available prey. Rather, M. coerulatus larvae could not survive more than 1 month of complete drying. Because the dry season typically lasts more than 6 weeks, habitat drying is a secondary source of mortality, affecting second- or third-generation larvae that fail to emerge before tree holes dry out completely.
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References
Anholt BR (1990) An experimental separation of interference and exploitative competition in a larval damselfly. Ecology 71:1483–1493
Baker RL (1981) Behavioural interactions and use of feeding areas by nymphs of Coenagrion resolutum (Coenagrionidae:Odonata). Oecologia 49:353–358
Baker RL (1989) Condition and size of damselflies: a field study of food limitation. Oecologia 81:111–119
Benke AC (1978) Interactions among coexisting predators — a field experiment with dragonfly larvae. J Anim Ecol 47:335–350
Benke AC, Benke SS (1975) Comparative dynamics and life histories of coexisting dragonfly populations. Ecology 56:302–317
Benke AC, Crowley PH, Johnson DM (1982) Interactions among coexisting larval Odonata: an in situ experiment using small enclosures. Hydrobiologia 94:121–130
Convey P (1988) Competition for perches between larval damselflies: the influence of perch use on feeding efficiency, growth rate and predator avoidance. Freshwat Biol 19:15–28
Corbet PS, Griffiths A (1963) Observations on the aquatic stages of two species of Toxorhynchites (Diptera:Culicidae) in Uganda. Proc R Entomol Soc Lond A 38:125–135
Crowley PH, Dillon PM, Johnson DM, Watson CN (1987a) Intraspecific interference among larvae in a semivoltine dragonfly population. Oecologia 71:447–456
Crowley PH, Isbet RM, Gurney WSC, Lawton JH (1987b) Population regulation in animals with complex life-histories: formulation and analysis of a damselfly model. Adv Ecol Res 17:1–59
Crowley PH, Gillett S, Lawton JH (1988) Contests between larval damselflies: empirical steps towards a better ESS model. Anim Behav 36:1492–1510
Dong Q, Polis GA (1992) The dynamics of cannibalistic populations: a foraging perspective. In: Elgar MA, Crespi BJ (eds) Cannibalism: ecology and evolution among diverse taxa. Oxford University Press, Oxford, pp 13–37
Fincke OM (1992a) Behavioural ecology of the giant damselflies of Barro Colorado Island, Panama. In: Quintero D, Aiello A (eds) Insects of Panama and Mesoamerica. Oxford University Press, Oxford, pp 102–113
Fincke OM (1992b) Consequences of larval ecology for territoriality and reproductive success of a neotropical damselfly. Ecology 73:449–462
Fincke OM (1992c) Interspecific competition for tree holes: consequences for mating systems and coexistence in neotropical damselflies. Am Nat 139:80–101
Folsom TC, Collins NC (1984) The diet and foraging behavior of the larval dragonfly Anax junius (Aeshnidae) with an assessment of the role of refuges and prey activity. Oikos 42:105–113
Fox LR (1975) Cannibalism in natural populations. Annu Rev Ecol Syst 6:87–106
Gribbon SD, Thompson DJ (1990) Asymmetric intraspecific competition among larvae of the damselfly Ischnura elegans (Zygoptera:Coenagrionidae). Ecol Entomol 15:37–42
Johansson F (1992) Effects of zooplankton availability and foraging mode on cannibalism in three dragonfly larvae. Oecologia 91:179–183
Johnson DM, Crowley PH, Bohanan RE, Watson CN, Martin TH (1985) Competition among larval dragonflies: a field enclosure experiment. Ecology 66:119–128
Johnson DM, Pierce CL, Martin TH, Watson CN, Bohanan RE, Crowley PH (1987) Prey depletion by odonate larvae: combining evidence from multiple field experiments. Ecology 68:1459–1465
Koenig WD, Albano SS (1987) Lifetime reproductive success, selection, and the opportunity for selection in the white-tailed skimmer, Plathemis lydia (Odonata:Anisoptera). Evolution 41:22–36
Lawton JH (1971) Maximum and actual feeding rates in the larvae of the damselfly Pyrrhosoma nymphula (Sulzer) (Odonata: Zygoptera). Freshwat Biol 1:99–111
Macan TT (1977) The influence of predation on the composition of freshwater animal communities. Biol Rev 52:45–70
McPeek MA, Crowley PH (1987) The effects of density and relative size on the aggregative behaviour, movement and feeding of damselfy larvae (Odonata:Coenagrionidae). Anim Behav 35:1051–1061
McVey ME (1988) The opportunity for sexual selection in a territorial dragonfly Erythemis simplicicollis. In: Clutton-Brock TH (ed) Reproductive success: studies of individual variation in contrasting breeding systems. University of Chicago Press, Chicago, pp 44–58
Merrill RJ, Johnson DM (1984) Dietary niche overlap and mutual predation among coexisting larval Anisoptera. Odonatologica 13:387–406
Miller PL (1983) The duration of copulation correlates with other aspects of mating behaviour in Orthetrum chrysostigma (Burmeister) (Anisoptera:Libellulidae). Odonatologica 12:227–238
Picado C (1913) Les broméliacées épiphytes considérée comme milieu biologique. Bull Sci Fr Belg 47:215–360
Pierce CL, Crowley PH, Johnson DM (1985) Behavior and ecological interactions of larval Odonata. Ecology 66:1504–1512
Polis G, Meyers CA, Holt RD (1989) The ecology and evolution of intraguild predation: potential competitors that eat each other. Annu Rev Ecol Syst 20:297–330
Price PW (1984) Insect ecology, 2nd edn. Wiley, New York
Strong DR, Simberloff D, Abele LG, Thistle AB (eds) (1984) Ecological communities: conceptual issues and the evidence. Princeton University Press, Princeton
Thompson DJ (1978) The natural prey of the damselfly Ischnura elegans (Odonata:Zygoptera). Freshwat Biol 8:377–384
Thompson DJ (1982) Prey density and survival in damselfly larvae: field and laboratory studies. Adv Odonatol 1:267–280
Van Buskirk J (1987) Density-dependent population dynamics in larvae of the dragonfly Pachidiplax longipennis: a field experiment. Oecologia 72:221–225
Van Buskirk J (1989) Density-dependent cannibalism in larval dragonflies. Ecology 70:1442–1449
Van Buskirk J (1992) Competition, cannibalism, and size class dominance in a dragonfly. Oikos 65:455–464
Van Buskirk J (1993) Population consequences of larval crowding in the dragonfly Aeshna juncea. Ecology 74:1950–1958
Windsor DM (1990) Climate and moisture variability in a tropical forest: long-term records from BCI, Panama. Smithsonian contributions to the earth sciences. 29. Smithsonian Institution Press, Washington DC
Wissenger SA (1988) Effects of food availability on larval development and instar-specific predation among larvae of Libellula lydia and Libellula luctuosa (Odonata:Anisoptera). Can J Zool 66:543–548
Wissenger SA (1989) Seasonal variation in the intensity of competition and predation among dragonfly larvae. Ecology 70:1017–1027
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Fincke, O.M. Population regulation of a tropical damselfly in the larval stage by food limitation, cannibalism, intraguild predation and habitat drying. Oecologia 100, 118–127 (1994). https://doi.org/10.1007/BF00317138
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DOI: https://doi.org/10.1007/BF00317138