THE EVOLUTION OF TISSUE MIGRATION BY PARASITIC NEMATODE LARVAE

被引:62
作者
READ, AF [1 ]
SKORPING, A [1 ]
机构
[1] UNIV TROMSO, INST BIOL & GEOL, DEPT ECOL & ZOOL, N-9037 TROMSO, NORWAY
基金
英国生物技术与生命科学研究理事会;
关键词
LARVAL MIGRANS; LIFE-HISTORY; NATURAL SELECTION; NEMATODE LARVAE; TISSUE PHASE;
D O I
10.1017/S0031182000081919
中图分类号
R38 [医学寄生虫学]; Q [生物科学];
学科分类号
07 ; 0710 ; 09 ; 100103 ;
摘要
Migration by nematode larvae through the tissues of their mammalian hosts can cause considerable pathology, and yet the evolutionary factors responsible for this migratory behaviour are poorly understood. The behaviour is particularly paradoxical in genera such as Ascaris and Strongylus in which larvae undergo extensive migrations which begin and end in the same location. The orthodox explanation for this apparently pointless behaviour is that a tissue phase is a developmental requirement following the evolutionary loss of skin penetration or intermediate hosts. Yet tissue migration is not always necessary for development, and navigation and survival in an array of different habitats must require costly biochemical and morphological adaptations. Migrating larvae also risk becoming lost or killed by the host. Natural selection should therefore remove such behaviour unless there are compensating benefits. Here we propose that migration is a selectively advantageous life-history strategy. We show that taxa exploiting tissue habitats during development are, on average, bigger than their closest relatives that develop wholly in the gastrointestinal tract. Time to reproduction is the same, indicating that worms with a tissue phase during development grow faster. This previously unsuspected association between juvenile habitat and size is independent of any effects of adult habitat, life-cycle, or host size, generation time or diet. Because fecundity is intimately linked with size in nematodes, this provides an explanation for the maintenance of tissue migration by natural selection, analogous to the pre-spawning migrations of salmon.
引用
收藏
页码:359 / 371
页数:13
相关论文
共 92 条
  • [11] Andrassy I., 1956, Archivum Zoologicum Budapest, V2, P1
  • [12] [Anonymous], 1974, CIH KEYS NEMATODE PA
  • [13] [Anonymous], 1994, INTRO ANIMAL PARASIT
  • [14] REGULATION OF HAEMONCHUS-CONTORTUS POPULATIONS IN SHEEP - MORTALITY OF ESTABLISHED WORMS
    BARGER, IA
    LEJAMBRE, LF
    [J]. INTERNATIONAL JOURNAL FOR PARASITOLOGY, 1988, 18 (02) : 269 - 273
  • [15] BARUS V, 1984, FOLIA PARASIT, V31, P227
  • [16] BEAVER PC, 1969, J PARASITOL, V55, P3, DOI 10.2307/3277335
  • [17] Begon M., 1990, ECOLOGY INDIVIDUALS
  • [18] BEHNKE JM, 1990, HOOKWORM DISEASE : CURRENT STATUS AND NEW DIRECTIONS, P105
  • [19] UNDERSTANDING CHRONIC NEMATODE INFECTIONS - EVOLUTIONARY CONSIDERATIONS, CURRENT HYPOTHESES AND THE WAY FORWARD
    BEHNKE, JM
    BARNARD, CJ
    WAKELIN, D
    [J]. INTERNATIONAL JOURNAL FOR PARASITOLOGY, 1992, 22 (07) : 861 - 907
  • [20] RELATIONSHIPS BETWEEN BODY SIZE AND SOME LIFE-HISTORY PARAMETERS
    BLUEWEISS, L
    FOX, H
    KUDZMA, V
    NAKASHIMA, D
    PETERS, R
    SAMS, S
    [J]. OECOLOGIA, 1978, 37 (02) : 257 - 272