Foreword | p. xi |
Preface | p. xiii |
Introduction: an historical background | p. 1 |
The myrmecochorous syndrome | p. 5 |
What is myrmecochory? | p. 5 |
The concept of the myrmecochorous syndrome | p. 6 |
Mechanisms of ant attraction | p. 6 |
Diversity of elaiosomes | p. 7 |
Elaiosomes originating from seed tissues | p. 9 |
Elaiosomes originating from fruit tissues | p. 11 |
Chemical composition of elaiosomes | p. 13 |
Elaiosome compounds attracting ants | p. 13 |
Effect of diaspore and elaiosome dimensions on diaspore attractiveness for ants | p. 15 |
Diaspore deposition into microsites frequently visited by ants | p. 16 |
Synchronisation of the plant fruiting periods with periods of ant activity | p. 19 |
Supplementary assimilating organs | p. 21 |
The myrmecochorous syndrome in facultative myrmecochores | p. 22 |
Other examples of ant-plant relationships | p. 22 |
The myrmecochorous syndrome and criteria of myrmecochory | p. 23 |
Summary | p. 24 |
Diaspore removal by ants | p. 25 |
[double left angle bracket]Cafeteria[double right angle bracket] experiments | p. 25 |
Morphology of diaspores of myrmecochorous plants | p. 26 |
Removal rates of elaiosome-bearing seeds by Formica polyctena workers | p. 28 |
Removal rates of seeds by the ant species complex of the forest | p. 28 |
Do ants prefer seeds of particular plant species? | p. 31 |
Do ants select seeds with the largest elaiosomes? | p. 32 |
Are there differences in the body size of ant workers which remove seeds of different plant species? | p. 34 |
Summary | p. 36 |
Factors influencing diaspore removal | p. 37 |
Effect of the diaspore size in Corydalis bulbosa and Corydalis cava | p. 37 |
Morphology and anatomy of diaspores | p. 38 |
Removal rates of seeds | p. 38 |
Effect of elaiosome, diaspore body, and their contents | p. 39 |
Seed anatomy | p. 40 |
Corydalis cava seeds | p. 40 |
Pulmonaria obscura erems | p. 41 |
Experiments with diaspores and juices from elaiosomes and diaspore bodies | p. 43 |
Corydalis cava seeds | p. 44 |
Pulmonaria obscura erems | p. 44 |
Diaspore structures that attract ants | p. 45 |
Effect of diaspore aggregation | p. 46 |
Cafeteria experiments with different degrees of seed aggregation in the depot | p. 47 |
Diaspore aggregation in obligate and facultative myrmecochores | p. 49 |
Summary | p. 50 |
Effect of the ant species complex on diaspore removal | p. 53 |
Visits to seed depots by ant foragers and seed removal | p. 54 |
Total seed removal at different microsites | p. 54 |
Contribution of different ant species to seed removal | p. 58 |
Formica polyctena territory | p. 58 |
Myrmica rubra territory | p. 58 |
Lasius fuliginosus territory | p. 58 |
Microsite quality for the myrmecochore | p. 59 |
Elaiosome consumption and seed removal | p. 60 |
Duration of seed manipulation by ants | p. 60 |
Number of seeds probed by ants prior to removal | p. 61 |
Elaiosome consumption | p. 62 |
Interactions between workers of different ant species at seed depots | p. 63 |
Effect of ant recruitment behaviour and learning on seed removal | p. 64 |
Mark-recapture experiments | p. 64 |
Recruitment and learning in ants and seed removal rates | p. 67 |
Summary | p. 68 |
Diaspore transporting by ants | p. 71 |
Methods of diaspore transporting | p. 72 |
Diaspore dropping during transport | p. 74 |
Dependence of diaspore dropping on the ant worker size | p. 75 |
Effect of diaspore dropping on dispersal distance | p. 77 |
Complex of factors used in the computer model | p. 77 |
Computer model | p. 77 |
Summary | p. 81 |
Seed flow in ant territories | p. 83 |
Direct observations of the seed flow | p. 84 |
Soil seed material | p. 85 |
Herbaceous species | p. 85 |
Myrmecochores | p. 87 |
Non-myrmecochores | p. 89 |
Effect of ant workers on the vegetation | p. 90 |
Seed flow in the territory of the Formica polyctena colony | p. 91 |
Diaspore concentration in ant nests | p. 91 |
Flow of diaspores of myrmecochores | p. 91 |
Flow of diaspores of non-myrmecochores | p. 93 |
Summary | p. 94 |
Secondary relocation of diaspores from ant nests | p. 97 |
Composition of mature plants and seedlings in various microsites | p. 98 |
Mature plants | p. 98 |
Seedlings | p. 98 |
Effect of ants on the distribution of plants in the forest | p. 101 |
Plant species composition of the soil seed pools at various microsites | p. 103 |
Distribution of diaspores within territories of ant colonies | p. 106 |
Diaspore flow within territories of colonies of Formica polyctena and Lasius fuliginosus ants | p. 106 |
Effect of ant behaviour on the distribution of diaspores | p. 107 |
Advantages for plants from the secondary relocation of diaspores | p. 108 |
Summary | p. 108 |
Comparative analysis of plant dispersal systems by ants: diaspore concentration and redistribution | p. 111 |
Variables used for simulation | p. 111 |
What proportion of diaspores reaches ant nests? | p. 113 |
Comparison of systems of diaspore dispersal by ants | p. 114 |
Dispersal without secondary relocation of diaspores | p. 114 |
Dispersal with secondary relocation of diaspores | p. 117 |
Analysis of diaspore dispersal systems | p. 118 |
Summary | p. 122 |
Ecological implications of myrmecochory | p. 123 |
Selective advantages of myrmecochory | p. 123 |
Hypotheses of selective advantages of myrmecochory | p. 123 |
Hypothesis of the nest environment | p. 123 |
Hypothesis of diaspore escape from predators | p. 124 |
Competition avoidance hypothesis | p. 124 |
Fire escape hypothesis | p. 125 |
Hypothesis of the dispersal for distance | p. 125 |
Recent studies of selective advantages of myrmecochory | p. 126 |
Ant nests as microhabitats for myrmecochores | p. 126 |
Viola odorata plants on nests of Formica polyctena ants | p. 127 |
Advantages for plants growing on ant nests | p. 129 |
Decrease of seedling density as a selective advantage of myrmecochory | p. 130 |
Spatial distribution of seedlings in Corydalis bulbosa | p. 131 |
First year of the experiment | p. 131 |
Second year of the experiment | p. 133 |
Effect of ants on seed dispersal of Corydalis bulbosa | p. 134 |
Effect of myrmecochory on the spatial distribution and mortality rate of seedlings in Asarum europaeum | p. 136 |
Spatial distribution and seedling mortality | p. 138 |
Effect of ants on seed dispersal in A. europaeum | p. 139 |
Summary | p. 140 |
Interactions between ants and non-myrmecochorous plants | p. 143 |
Interactions between the non-myrmecochore Galium aparine and Formica polyctena ants | p. 144 |
Removal and transport of diaspores | p. 144 |
Dynamics of seedling density and plant growth | p. 145 |
Asymmetry of interactions between non-myrmecochores and ants | p. 149 |
Plant concentration on the nest mounds | p. 149 |
Why do ants remove and transport diaspores without elaiosomes? | p. 149 |
Character of interactions between non-myrmecochores and ants | p. 150 |
Summary | p. 151 |
Methods for studying myrmecochory | p. 153 |
Study site | p. 153 |
Plant species covered by the experiments | p. 154 |
Obligate myrmecochores | p. 155 |
Facultative myrmecochores | p. 156 |
Non-myrmecochores | p. 156 |
Ant species used in the experiments | p. 157 |
Methods | p. 157 |
Morphology and anatomy | p. 157 |
Field observations and experiments | p. 158 |
Studies on the myrmecochorous syndrome | p. 158 |
[double left angle bracket]Cafeteria[double right angle bracket] experiments | p. 159 |
Factors influencing diaspore removal rate | p. 160 |
Effect of the ant species composition on diaspore removal | p. 162 |
Diaspore transport by ants | p. 164 |
Plant diaspore flows on ant territories | p. 165 |
Secondary relocation of diaspores by ants | p. 165 |
Ecological aspects of the myrmecochory | p. 165 |
Interactions between ants and non-myrmecochorous plants | p. 168 |
Soil seed bank | p. 169 |
Summary | p. 170 |
Conclusions and outlook | p. 173 |
Glossary | p. 177 |
References | p. 185 |
Appendix | p. 201 |
Index | p. 217 |
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