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The position of graptolites within Lower Palaeozoic planktic ecosystems.

By Charlie J. Underwood


An integrated approach has been used to assess the palaeoecology of graptolites both as a discrete group and also as a part of the biota present within Ordovician and Silurian planktic realms. Study of the functional morphology of graptolites and comparisons with recent ecological analogues demonstrates that graptolites most probably filled a variety of niches as primary consumers, with modes of life related to the colony morphotype. Graptolite coloniality was extremely ordered, lacking any close morphological analogues in Recent faunas. To obtain maximum functional efficiency, graptolites would have needed varying degrees of coordinated automobility. A change in lifestyle related to ontogenetic changes was prevalent within many graptolite groups. Differing lifestyle was reflected by differing reproductive strategies, with synrhabdosomes most likely being a method for rapid asexual reproduction. Direct evidence in the form of graptolithophage 'coprolitic' bodies, as well as indirect evidence in the form of probable defensive adaptations, indicate that graptolites comprised a food item for a variety of predators. Graptolites were also hosts to a variety of parasitic organisms and provided an important nutrient source for scavenging organisms

Topics: es
Publisher: Wiley
Year: 1993
OAI identifier:

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  1. (1971). 1971a Feeding habits of graptolites. Abstracts Geological Society of America Annual Meeting.
  2. A Global Standard for the Silurian System.pp.141-149. National Museum of Wales.
  3. (1986). A mathematical study of the Cyrtograptus sakmaricus lineage with discussions of the evolutionary trends in this lineage. doi
  4. (1974). A membrane-bearing Cyrtograptus and the interpretation of the hydrodynamics of cyrtograptids.
  5. (1976). A new type of graptolite synrhabdosome.
  6. (1984). Autecology of Silurian graptoloids.
  7. (1990). Biofacies. In
  8. (1973). Biological Oceanic Processes. doi
  9. (1973). Bipolar graptolites and the Silurian genus Diversograptus Manck. Palaontologische Zeitschrift. doi
  10. (1987). Branching geometry and function of multiramous graptoloids.
  11. (1971). Buoyancy structures in rhabdosomes of Dictyonema flabelliforme (Eichwald).
  12. Cephalopods - biasing agents in the preservation of lobsters.
  13. (1988). Characteristic trace fossil associations in O poor sedimentary environments. doi
  14. (1988). Characteristic trace fossil associations in O2 poor sedimentary environments. doi
  15. (1988). Conodonts from the Ordovician -Silurian stratotype, Dobs Linn,
  16. (1979). Current related morphology and behaviour in some Pacific coast bryozoans.
  17. (1935). Das Schweben der wasser Organismen' Ergebnisse der Biologie II doi
  18. (1993). Decay and preservation of polychaetes: taphonomic thresholds in soft-bodied organisms. Paleobiology .In press
  19. (1991). Deep- water taphonomy of vertebrate carcasses: a whale skeleton in the bathyal Santa Catalina Basin.
  20. (1984). Destabalization of the oceanic density structure and its significance to marine "extinction" events. doi
  21. (1971). Development of Glyptograptus hudsoni sp. nov from Southampton Island,
  22. (1984). Dichograptid synrhabdosomes from the Arenig of Britain.
  23. (1976). Ecostratigraphy of Ordovician graptoloids. In Bassett, M.G. The Ordovician system.:
  24. (1986). Eine mutmassliche Graptolinthen -Laichschnur (Sikula-Band) ans dem Unterdevon Marokkos. Zeitschrift für
  25. (1977). Evolution of the Silurian and Devonian graptoloids. doi
  26. (1991). Feeding strategies of graptolites.
  27. (1985). Food web of an Antarctic midwater ecosystem. doi
  28. (1987). Form and mode of life of Dicellograptus (Graptolinthina). doi
  29. (1974). Fossil organic material : a unique fibril ultrastructure in Silurian graptolites.
  30. (1983). Geometrical constraints in the construction of graptolite stipes.
  31. (1986). Graptolinthen als Tentakulitenfalle. Zeitschrift für
  32. (1970). Graptolinthina, with sections on Enteropneusta and Pterobranchia In
  33. (1986). Graptolite biofacies and correlation of eustatic, subsidence and tectonic events in the M.-U. doi
  34. (1990). Graptolite biogeography: implications for palaeogeography and palaeoceanography. doi
  35. (1947). Graptolites of North America. doi
  36. (1992). Graptoloid feeding efficiency, rotation and astogeny. doi
  37. (1991). How did they live?
  38. (1990). Hunsrück Slate. doi
  39. (1991). Isolated graptolites from the Llandovery of Kallholen, doi
  40. (1990). Juvanile sessility, vertical automobility and passive lateral transport as factors in graptoloid evolution.
  41. (1977). Krill. In Living Resources of the Southern Ocean. F.A.O. Southern Ocean Fisheries Survey Programme Finney,
  42. (1977). Krill. In Living Resources of the Southern Ocean. F.A.O. Southern Ocean Fisheries Survey ProgrammeFinney,
  43. (1991). Latitudinal and depth zonation of early Ordovician graptolites. doi
  44. (1949). Les graptolithes et quelque nouveaux groupes d'animaux du Tremadoc de la Pologne. doi
  45. (1992). Life at low oxygen tensions : the behaviour and physiology of Nautilus pompilius and the biology of extinct forms. doi
  46. (1964). Lower Palaeozoic plankton. doi
  47. (1991). Mid Silurian pelagic and hemipelagic sedimentation and palaeoceanography:
  48. (1977). Middle and Upper Ordovician graptolites from the St. Lawrence lowlands, doi
  49. (1978). Mode of life of graptolites.
  50. (1958). Monograptidae from erratic boulders of Poland.
  51. (1972). More thoughts on the automobility of graptolites. doi
  52. (1989). New evidence for the life habits of graptiloids from physical modelling.
  53. (1990). New observations on the mode of life, evolution and ultrastructure of graptolites.
  54. (1985). Non-skeletonized Lower Invertebrate Fossils: a review. In
  55. (1965). Oeufs fossiles des cephalopodes?
  56. On some fossils from the graptolitic shales of Dumfriesshire. doi
  57. (1977). Ordovician and Silurian brachiopods from graptolitic shales and related deep water argillaceous rocks. doi
  58. (1983). Ordovician inarticulate brachiopods from graptolitic shale at Dobs Linn, Scotland - thier morphology and significance.
  59. (1989). Ostracods. In A Global Standard for the Silurian System..
  60. (1990). Palaeobiology- a synthesis.
  61. (1990). Palaeobiologya synthesis.
  62. (1984). Palaeoecology of graptolitic black shales.
  63. (1975). Palaeoecology of the Graptolithina, an extinct class of the Phylum Hemichordata. doi
  64. (1981). Parasites in the fossil record. doi
  65. (1979). Patterns of the vertical distribution of phytoplankton in typical biotopes of the open sea.
  66. (1985). Pelagic trilobites as an example of deducing the life habits of extinct arthropods. doi
  67. (1981). Periodicity in the early Palaeozoic marine realm. doi
  68. (1937). Planktonic crustaceans from the Lower Didymograptus Shale (3b) of Oslo.
  69. (1971). Regneration and growth abnormalities in Orthograptus quadrimucronatus from the Ordovician Maquoketa formation of Iowa.
  70. (1974). Sicula and thecae in Monograptus (Testograptus) testis.
  71. (1989). Silurian field excursions. A geotraverse across Wales and the Welsh Borderlands. doi
  72. (1972). Some thoughts on the construction of the rhabdosomes in the Graptolinthina, with special reference to extrathecal tissue and its bearing on the theory of automobility. University college of Wales,
  73. (1969). Some thoughts on the ecology, mode of life and evolution of the Graptolinthina.
  74. (1967). Sur certains fossiles Ordoviciens a test organique.
  75. (1986). Taphonomic implications of polychaete jaws recovered from gut contents of queen triggerfish. doi
  76. (1989). Taphonomic influence on perception of the Late Ordovician mass mortality.
  77. (1991). Taphonomy of Nonmineralized Tissues. doi
  78. (1971). Tetragraptus otagoensis and Janograptus terranovensis n.sp., Ordovician graptolites from western and northern Newfoundland.
  79. (1987). The Arenig Series in South Wales.
  80. (1969). The biology of Euphausiids. doi
  81. (1983). The Biosphere. doi
  82. (1984). The chemical evolution of the atmosphere and oceans. doi
  83. (1986). The community structure of the Middle Cambrian phyllopod bed (Burgess shale).
  84. (1968). The composition and structure of Lower Silurian marine communities. doi
  85. (1959). The distribution and life history of Euphausia triacantha Holt & Tattersall.
  86. (1970). The earliest monograptid. doi
  87. (1986). The enigma of graptolite ancestory : lesson from a phylogenetic debate.
  88. (1981). The fine structure of graptolite periderm. doi
  89. (1978). The Fossil Record II. doi
  90. (1989). The graptolites- strange plankton of the past. doi
  91. (1985). The largest Cambrian animal Anomalocaris,Burgess Shale, British Columbia. doi
  92. (1971). The Ludlow graptolites Neodiversograptus nilssoni and Cucullograptus (Lobograptus) progenitor. doi
  93. (1978). The nature and mode of life of the graptolite zooid with reference to secretion of the cortex.
  94. (1987). The oceanic non-sulfidic oxygen minimum zone: a habitat for graptolites?
  95. (1974). The structure of marine ecosystems. 128pp doi
  96. (1958). Triangulate monograptids from the Monograptus gregarius zone of the Reidol Gorge. doi
  97. (1970). Tubotheca, a peculiar morphological element in some graptolites.
  98. (1928). Über Dawsonia Nicholson, Peltocaris Salter und über die Graptolithen- Studien
  99. (1959). Un microfossile enigmatique.
  100. (1991). What was their sex life like?. In

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