Abstract
Three sampling techniques commonly used to estimate the population size of caterpillars and sawfly larvae in trees (branch samples, frass production, water basins), were compared with respect to sampling error and economic costs. At the level of tree populations (e.g. forests), on an arbitrary date, the mean caterpillar intensity per tree (expressed in numbers of larvae or their biomass per 100 shoots) was predicted from the mean frass production per tree (expressed in mg frass per m2 forest floor per day). At the level of the single tree, the frass production on an arbitrary date was related to the population intensity, but, due to the large sampling error, did not provide an accurate prediction. Summing the frass produced over the whole season reduced this error and predicted the seasonal abundance of larvae in single trees, estimated as their maximum intensity or their density (numbers of larvae or their biomass per m2 forest floor). The maximum population intensity was not related to the population density. The sampling techniques suffer from large errors unrelated to larval abundance. The main sources of error (i.e. weather or predation of the larvae) usually cause an underestimation of population size. Labour, the main cause of high costs, was low in the basin technique and high in the frass production technique. Possible ways of reducing errors and applications of the three techniques are discussed.
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References
Balen JH van (1973) A comparative study of the breeding ecology of the great tit Parus major in different habitats. Ardea 61:1–93
Basset Y, Burckhardt D (1992) Abundance, species richness, host utilization and host specificity of forest folivores from a woodland site, with particular reference to host architecture. Rev Suisse Zool 99:771–791
Binns MR, Nyrop JP (1992) Sampling insect populations for the purpose of IPM decision making. Annu Rev Entomol 37:427–453
Crawford HS, Jennings DT (1989) Predation by birds on spruce budworm Choristoneura fumiferana: functional, numerical, and total responses. Ecology 70:152–163
Crawley MJ, Akhteruzzaman H (1988) Individual variation in the phenology of oak trees and its consequences for herbivorous insects. Funct Ecol 2:409–415
Dufner J, Jensen U, Schumacher E (1992) Statistik mit SAS. Teubner, Stuttgart
Feeny P (1970) Seasonal changes in oak leaf tannins and nutrients as a cause of spring feeding by winter moth caterpillars. Ecology 51:565–581
Fridén F (1958) Frass-drop frequency in Lepidoptera. Almqvist and Wiksells, Uppsala
Groeters FR, Shaw DD (1992) Association between latitudinal variation for embryonic development time and chromosome structure in the grasshopper Caledia captiva (Orthoptera: Acrididae). Evolution 46:245–257
Karban R, Ricklefs RE (1983) Host characteristics, sampling intensity, and species richness of lepidoptera larvae on broad-leaved trees in southern Ontario. Ecology 64:636–641
Karban R, Ricklefs RE (1984) Leaf traits and the species richness and abundance of lepidopteran larvae on deciduous trees in southern Ontario. Oikos 43:165–170
Knight FB, Heikennen HJ (1980) Principles of forest entomology. McGraw-Hill, New York
Kuno E (1991) Sampling and analysis of insect populations. Annu Rev Entomol 36:285–304
Liebhold AM, Elkinton JS (1988a) Techniques for estimating the density of late-instar gypsy moth, Lymantria dispar (Lepidoptera: Lymantriidae), populations using frass drop and frass production measurements. Environ Entomol 17:381–384
Liebhold AM, Elkinton JS (1988b) Estimating the density of larval gypsy moth, Lymantria dispar (Lepidoptera: Lymantri-idae), using frass drop and frass production measurements: sources of variation and sample size. Environ Entomol 17:385–390
Morris RF (1955) The development of sampling techniques for forest insect defoliators, with particular reference to the spruce budworm. Can J Zool 33:225–294
Morris RF (1960) Sampling insect populations. Annu Rev Entomol 5:243–264
Morrison ML, Ralph CJ, Verner J, Jehl JR (1990) Avian foraging: theory, methodology, and applications (Studies in avian biology, vol 13). Cooper Ornithological Society, Los Angeles
Noordwijk AJ van (1990) The effects of forest damage on caterpillars and their effect on the breeding biology of the great tit, an overview. In: Blondel J, Gosler A, Lebreton J-D, McCleery R (eds) Population biology of passerine birds (NATO ASG Series G, vol 24). Springer, Berlin Heidelberg, pp 215–222
Perrins CM (1965) Population fluctuations and clutch-size in the great tit, Parus major L. J Anim Ecol 34:601–647
Raupp MJ, Koehler CS, Davidson JA (1992) Advances in implementing integrated pest management for woody landscape plants. Annu Rev Entomol 37:561–585
Reichenbach NG, Stairs GR (1985) Bioenergetics of the western spruce budworm (Lepidoptera: Tortricidae) with comments on endotherm and ectotherm population energetics. Can J Zool 63:1330–1338
Riemer J, Whittaker JB (1989) Air pollution and insect herbivores: observed interactions and possible mechanisms. In: Bernays EA (ed) Insect-plant interactions, vol 1. CRC Press, Boca Raton, pp 73–105
Roland J, Hannon SJ, Smith MA (1986) Foraging pattern of pine siskins and its influence on winter moth survival in apple orchard. Oecologica 69:47–52
Royama T (1970) Factors governing the hunting behaviour and selection of food by the great tit (Parus major L.). J Anim Ecol 39:619–668
SAS Institute (1990) SAS/STAT User's Guide, version 6. SAS Institute Inc, Carey, Northern Carolina
Schwerdtfeger F (1931) Die Ermittlung der Mortalität von Raupen während einer Insektenepidemie. Anz Schädl 7:85–90
Scriber JM, Feeny P (1979) Growth of herbivorous caterpillars in relation to feeding specialization and to the growth form of their food plants. Ecology 60:829–850
Southwood TRE (1978) Ecological methods. Chapman and Hall, London
Tinbergen L (1960) The natural control of insects in pinewoods. 1. Factors influencing the intensity of predation by song birds. Arch Neérl Zool 13:265–343
Varley GC, Gradwell GR, Hassell MP (1973) Insect population ecology. An analytical approach. Blackwell, Oxford
Volney WJA, Koehler CS, Browne LE, Barclay LW, Milstead JE, Lewis VR (1983) Sampling for California oakworm on landscape oaks. Calif Agric 37:8–9
Zandt HS, Strijkstra AM, Blondel J, Balen JH van (1990) Food in two mediterranean blue tit populations: Do differences in caterpillar availability explain differences in timing of the breeding season? In: Blondel J, Gosler A, Lebreton J-D, McCleery R (eds) Population biology of passerine birds (NATO ASG Series G, vol 24). Springer, Berlin Heidelberg New York, pp 145–155
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Zandt, H.S. A comparison of three sampling techniques to estimate the population size of caterpillars in trees. Oecologia 97, 399–406 (1994). https://doi.org/10.1007/BF00317331
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DOI: https://doi.org/10.1007/BF00317331