Skip to main content
Article thumbnail
Location of Repository

Ecological studies of isopoda and diplopoda in dune grassland

By Robert Clive Davis

Abstract

Distribution, population dynamics, biomass and population\ud production of macrodecomposers have been studied in order to\ud clarify the role of four species in the processes of energy\ud transfer in a dune grassland ecosystem. The-species worked on were Armadillidiun vulgare, Porcellio scaber, Philoscia muscorum (Isopoda) and Cylindroiulus latestriatus (Diplopoda). Population data were available for the species from 1968 to 1975.\ud \ud Preliminary investigations indicated little difference\ud in the diet of each species and in their interactions with\ud predators; however there were significant differences in vertical and horizontal distribution.\ud \ud The vertical distribution of each species changed with\ud season, mainly in response to variations in temperature in winter and relative humidity-in summer. Despite these movements there was a consistent-difference in the mean depth of each species. The millipede showed a particularly marked difference from the woodlice because it was mainly a root layer inhabitant whereas they were most abundant in the litter layer.\ud \ud Horizontal distribution studies indicated that P. muscorum\ud stable predominated in the stable dune while A. vulgare. and P. scaber were more abundant towards the dune crest. The last two species showed evidence of migration between different areas of the dune system in early summer 1975.\ud \ud Changes in abundance and aggregation were, also. observed.\ud P. muscorum declined from a maximum density of 103.7 0.1m-2 in August 1970 to zero in October 1974 whereas A. vulgare increased from a minimum of 1.7 0.1m 2 in January 1969 to a maximum of 73.9 in September 1973. P. scaber and C. latestriatus exhibited smaller changes; maximum and minimum estimates were 27.1 and 0.9 0.1 m 2, and 16.0 and 1.9 0.1m 2 respectively,\ud \ud All species showed changes in aggregation during the course\ud of the study. Aggregation increased in the woodlice in 1974 and 1975 and decreased in the millipede.\ud \ud It is suggested that the changes in density and aggregation\ud were related to changing conditions on the study site, particularly those caused by rabbit disturbance and sand accumulation.\ud \ud There were seasonal density fluctuations also. Changes in\ud size structure, the breeding biology and cohort dynamics of the A. vulgare and P. scaber populations were examined to obtain insight into the importance of natality, mortality and migration in determining these fluctuations. The density of each species peaked in late summer when brood release occurred and declined at other times due to continuous losses. Immigration caused spring and summer density increases and appeared to be the main determinant of breeding population size.\ud \ud Population size structure, breeding biology and biomass of\ud C. latestriatus was studied. The rate of development of C. latestriatus at Spurn is intermediate between that of populations to the North and South. It is suggested that the more northerly populations take longer to mature due to lower mean annual temperatures. \ud \ud Comparison of biomass and population production for the\ud three isopod species indicated large fluctuations in individual species but the total values were fairly steady with a maximum mean annual standing crop of 744 mg live weight 0.1m 2 during 1973/74 and a minimum of 295 during 1968/69. Maximum and minimum mean annual population production figures for the three isopods -combined were 366.6 mg dry weight 0.1n 2 during 1971/72 and\ud 147.4 during 1968/69.\ud \ud Finally the results are discussed in relation to niche separation, iv life history strategies and the role of macrodecomposers in the dune grassland ecosystem

Publisher: Faculty of Biological Sciences (Leeds)
Year: 1978
OAI identifier: oai:etheses.whiterose.ac.uk:177

Suggested articles

Citations

  1. (1957). A factorial analysis of distribution in three species of diplopods.
  2. (1974). A laboratory study of the effects of some climatic factors on the demography of the terrestrial isopod Porcellio spinicornis doi
  3. (1965). A natural law for the spatial disposition of insects.
  4. (1963). A new extractor for 94 woodland litter. Pedobiologia ý,
  5. (1974). A population of Cylindroiulus latestriatus (Curtis) on sand dunes.
  6. (1963). A study of microarthropod communities in mineral soils near Corby, doi
  7. (1961). Aggregation, variance and the mean. doi
  8. (1963). Animal Ecology : Aims and Methods. Second edition. doi
  9. (1964). Au sujet de la prdsence de Blaniulus cuttulatus Bose. et d' Archiboreoiulus pallidus Br. -Bk. (Myriapodes , Diplopodes) Bans les couches 91 superieures du sol, au moment des semis de betteraves.
  10. (1968). Bioenergetics of the woodlouse Tracheoniscus rathkei Brandt in relation to litter decomposition in a deciduous forest. doi
  11. (1967). Community metabolism of soil invertebrates in forest ecosystems in Japan.
  12. (1938). Comparitive ecological studies on terrestrial isopod Crustacea of the San Francisco Bay region.
  13. (1976). Competition and niche shifts of mice introduced onto small islands. doi
  14. (1973). Conditions of coexistence in sympatric breeding populations of Acrocephalus warblers. doi
  15. (1969). Distribution and abundance of bog-inhabiting pselaphid beetles. doi
  16. (1952). Downs and Dunes.
  17. (1944). Ecological aspects of species formation in passerine birds. doi
  18. (1966). Ecological Energetics; Edward Arnold (Publishers Ltd.
  19. (1966). Ecological Methods. doi
  20. (1976). Ecology of Australian chats(Epthianura Gould) : Seasonal movements, metabolism and evaporative water loss. doi
  21. (1970). Ecology of Soil Animals. doi
  22. (1968). Emigration, mortality rates and the food shelter conditions of Ligidium hypnorum 1.
  23. (1969). Energetics of isopod populations in a forest of central Japan. doi
  24. (1975). Energetics of the diplopod Autures evides. doi
  25. (1957). Estimation of humidity with cobalt thiocyanate papers and permanent colour standards. doi
  26. (1974). Factors affecting oxygen consumption in the woodlouse Porcellio scaber Latr. doi
  27. (1967). Feeding activity of the millipede Glomeris marginata (Villers) in relation to its vertical distribution in the soil. (Progress in Soil Biology).
  28. (1953). Fitting the negative binomial distribution to biological data. doi
  29. (1974). Food consumption and growth in a laboratory population of Ophyiulus pilosus
  30. (1970). Food niche and coexistence in lake-dwelling triclads. doi
  31. (1970). Food selection by Chorthippus parallelus (Zetterstedt)(Orthoptera : Acrididae) in the field. doi
  32. (1959). Fundamentals of Ecology : Second Edition. doi
  33. (1971). Fundamentals of Ecolopv : Third Edition.
  34. (1960). Key factors in population studies. doi
  35. (1960). La mesure dcologique de la tempgrature par ddtermination de la vitesse d'inversion du saccharose. VeZoetatio S, doi
  36. (1974). Length-weight ratios and fecundity in Idotea baltica baltica (Pallas) from the Baltic Sea.
  37. (1970). Life historical consequences of natural selection. doi
  38. (1962). Migration of terrestrial arthropods in 98 relation to habitat. doi
  39. (1977). Niche partition in two Tasmanian amphipod species. Soil 0rranisms as Components of Ecosystems.
  40. (1941). Observations on the life histories of some terrestrial isopods. doi
  41. (1971). Observations on the vertical distribution of Oribatei (Acarina) in two woodland soils. IV Colloquium PedobioloLiae.
  42. (1963). Observations sur 1' hibernation de Blaniulus guttulatus Bose. (Hyriapode -Diplopode -
  43. (1966). On optimal use of a patchy environment. doi
  44. (1970). On r- and K- selection. doi
  45. (1951). On the responses to environmental stimuli, and the sensory physiology of millipedes (Diplopoda). doi
  46. OpzoekStns.
  47. (1977). Parental investment and offspring fitness in the terrestrial isopod Armadillidium vuln'are (Latr. doi
  48. (1954). Part 4: the structure, habits and evolution of the diplopoda. doi
  49. (1961). Part 7: Functional requirements and body design in Colobognatha (Diplopoda), together with a comparative account of diplopod burrowing techniques, trunk musculature and segmentation. doi
  50. (1976). Population Biolopv.
  51. (1962). Population characteristics of the terrestrial isopod Armadillidium vulgare in California grassland. doi
  52. (1972). Population density, biomass and maximum natality rate and food conditions in Ligidium hypnorum
  53. (1976). Population dynamics and bioenergetics of the terrestrial isopod Armadillidium vulgare (Latreille) in grassland ecosystems.
  54. (1958). Population ecology of some warblers of northeastern coniferous forests. doi
  55. (1972). Populations in a Seasonal Environment. doi
  56. (1976). Porcellio spini. cornis Say (Isopoda) demography. II. A comparison between field and laboratory data. doi
  57. (1970). Predation on woodlice, an investigation using the precipitin test. Entomolo; ia exp. doi
  58. (1963). Predictive population equations based on key factors. doi
  59. (1974). Primary production and leaf litter breakdown of Ammophila arenaria in a sand dune succession.
  60. (1970). Productivity of Terrestrial Animals, Principles and Methods. Blackwell Scientific Publications, doi
  61. (1973). Quantitative and Dynamic Plant Fcolor. Edward
  62. (1953). Reactions of diplopods to the relative humidity of the air.
  63. (1975). Seasonal and vertical distribution of a population of soil arthropods : Cryptostigmata. Pedbiologia jj,
  64. (1971). Seasonal, and vertical distribution of the arthropod fauna of an old grassland soil.
  65. (1971). Sensitivity of terrestrial isopod populations (Armadillidium) to food quality differences. doi
  66. (1977). Soil animal species diversity and soil habitat structure. Soil Organisms as Components of Ecosystems,
  67. (1973). Soil Zool.,
  68. (1967). Some consequences of food quality for Armadillidium vulprare populations (Isopoda :
  69. (1969). Some properties of the aggregations of soil arthropods : doi
  70. (1973). Stability and Complexity in Model Ecosystems. doi
  71. (1973). Stand structure and litter fall of a coppiced beech Pagus Syivatica) and sweet chestnut Castanets sativa) woodland. doi
  72. (1959). Statistical Methods in Biolo; y.
  73. (1975). Statistical Package for the Social Sciances.
  74. (1976). Studies on the biology of Philoscia Mus` corum (Crustacea : Isopoda) with particular reference to its role in a dune grassland ecosystem.
  75. (1966). Studies on the feeding behaviour of the millipede lulus scandinavius (Latzel 1884).
  76. (1964). Studies on the millipedes of a Devon oak wood.
  77. (1974). The adaptive significance of variations in the life cycles of schizophylline millipedes.
  78. (1968). The animal habitat of soil bacteria. The 95 Ecolos y of Soil Bacteria.
  79. (1968). The Anolis lizards of Bimini : resource partitioning in a complex fauna. doi
  80. (1963). The contribution of the microfauna to total soil metabolism. Soil Organisms (Ed.
  81. (1975). The distribution and abundance of woodland species of British Drosophila (Diptera : doi
  82. (1957). The distribution of woodland isopods. doi
  83. (1963). The ecology of Armadillidium vulgare (Isopoda : Oniscoidea) doi
  84. (1966). The ecology of isopod populations in grassland.
  85. (1974). The enigma of soil species diversity. doi
  86. (1944). The influence of temperature on vertical migration of invertebrates inhabiting different soil types. Ecolo t, doi
  87. (1973). The life cycle and annual production of Trichoniscus pusillus pusillus (Crustacea : Isopoda) in a Cheshire wood. doi
  88. (1974). The life cycle and ecology of Ophyiulus pilosus (Newport)
  89. (1957). The Life of the Shrew. doi
  90. (1970). The millipedes of a Cheshire wood. doi
  91. (1977). The population dynamics of Philoscia muscorum (Crustacea : Oniscoidea) in a dune grassland ecosystem with a serological study of mortality due to predation. doi
  92. (1976). The population dynamics of Philoscia muscorum (Crustacea : Oniscoidea) in a dune grassland ecosystem. doi
  93. (1968). The population dynamics of Trichoniscus pusillus and Philoscia suascorum (Crustacea : Oniscoidea) in limestone grassland. doi
  94. (1969). The strategy of ecosystem development. doi
  95. (1963). The use of respiratory data in estimating annual respiratory metabolism with particular reference to Leiobunum rotundum (Latr. doi
  96. (1977). The vertical distribution of isopods and diplopods in a dune grassland.
  97. (1967). Theory of Island Bioieoiranhy.
  98. (1968). Transition from water to land in isopod crustaceans. doi
  99. (1958). Uber die Zersetzung der Laubstreu durch die Boden-Makrofauna in Auenwald.
  100. (1974). Vertical orientation and aggregations of Proteroiulus fuscus (Am.
  101. (1954). Woodlice and the land habitat. doi

To submit an update or takedown request for this paper, please submit an Update/Correction/Removal Request.