Ants. M. V. Brian

nest containing Myrmica (Michael Tweedie)

       Myrmica workers licking and feeding larvae (Michael Tweedie)

       Myrmica workers polishing larvae (Michael Tweedie)

       Myrmica nest showing clusters of eggs and pupae (Michael Tweedie)

       9. Winged sexuals and workers of Lasius flavus (Stephen Dalton/N.H.P.A.)

       Workers of Lasius flavus with large sexual larvae (Stephen Dalton/N.H.P.A.)

       10. A worker Lasius niger dragging a cocoon (Michael Tweedie)

       Lasius niger worker with larva (Michael Tweedie)

       11. Lasius flavus mounds in limestone grassland (M. V. Brian)

       Close-up of Lasius flavus mound (M. V. Brian)

       12. Lasius flavus mounds in sandy soil (M. V. Brian)

       Close-up of Lasius flavus mound and heathers (M. V. Brian)

       13. Worker of Formica rufa being attacked by Lasius flavus (Stephen Dalton/N.H.P.A.)

       Workers of Formica rufa attacking a hostile alien (Stephen Dalton/N.H.P.A.)

       14. Formica rufa worker swollen with honey-dew (Stephen Dalton/N.H.P.A.)

       Food exchange between Formica rufa workers (Stephen Dalton/N.H.P.A.)

       15. Workers of Formica rufa restraining winged sexual (Stephen Dalton/N.H.P.A.)

       Winged sexual captured by workers (Stephen Dalton/N.H.P.A.)

       Workers of Formica rufa capturing a fly (Stephen Dalton/N.H.P.A.)

       16. Formica rufa worker carrying another (Harold Doering/Frank W. Lane)

       Formica rufa worker carrying a worm (Harold Doering/Frank W. Lane)

EDITORS’ PREFACE

      This series has always tried to give a balanced and authoritative account of a subject of interest to the general reader who is concerned with the countryside, and who wishes to know more about its fauna and flora. In Dr M. V. Brian we have an author who is recognized as the foremost authority in Britain on ants. Over a period of nearly thirty years, first as a lecturer in zoology in the University of Glasgow, and since 1953 with the Nature Conservancy at Furzebrook Research Station in Dorset, he has studied social insects in general and ants in particular. His most intensive studies in recent years have been on the heathlands of southern England, but he is also familiar with the species restricted to other parts of the country. He has written more than seventy original scientific papers describing his research, and has clearly contributed greatly to the advancement of knowledge of this group.

      Since biblical days, ants have interested the general public as well as the specialist entomologist. The insects’ apparent industry has endeared them to the moralist, and has been equated with virtue and prudence in the fables of many cultures. Parables based on ants are thus widespread, not only in scripture but in the tales of such writers as Aesop and La Fontaine. This has given rise to a general belief that ants are beneficial insects whose presence should always be encouraged. On the other hand gardeners from their own observations may be more doubtful, particularly when ants invade and infest their houses. Picnickers in our woods who sit near – or even on – an ant hill may feel rather differently. All country dwellers are aware of ants, but few have any accurate information on the subject, and many widely accepted legends have little foundation in fact. We believe that this book will therefore fill a real demand, by giving the sort of information that has so far been difficult to obtain.

      Dr Brian draws continually in his text on his personal experiences and on the brilliant investigation he himself has made. At the same time he would be the first to insist that no one person could do more than a fraction of the research necessary for the writing of a book like this. He clearly has to depend on the work of many others, and the reader will notice that though he treats others’ findings with the same rigorous criticism he reserves for his own observations, he also gives them the fullest credit when it is deserved. He has therefore produced a readable and informative book which describes the nature and behaviour of ants and their importance in the ecology of our countryside.

AUTHOR’S PREFACE

      This book is about the natural history of the ants that occur in the British Isles. Most of the species have wide temperate Eurasian distributions and, though unspectacular compared with some tropical types, play an important part in terrestrial ecosystems. The book attempts to bring together much recent work on their ecology and general biology and is, I hope, written in a way that will interest and be of use to all naturalists.

      A reading list is added to guide anyone who wishes to go further. No references are given and I am thus particularly indebted to the many workers in this field whose publications have supplied the basic material of this book. Technical names for structural features are explained in a series of figures, the main elements of which have been extracted from Charles Janet’s detailed drawings published at the turn of the century.

      At the last moment it was possible to improve the book enormously by including distribution maps prepared by the Biological Records Centre. The information was collected and collated by Mr K. E. J. Barrett, who introduces them.

      I should like to thank my wife for reading the manuscript and discussing it with me.

      M. V. Brian

      November 1976

      Furzebrook, Wareham, Dorset

CHAPTER 1

       ANTS AS INSECTS

      ALL ants are social insects – but only in the female sex; males exist briefly to generate sperm for sexual reproduction. Females are of two distinct sorts. One is relatively large and designed to fly and seek out new places in which to live; she lays fertilized eggs and influences the manner of brood-rearing in the colony. The other is smaller and wingless with a much simpler form altogether; she devotes most of her time to nest making and defence, brood hygiene and feeding and, later in life, to collecting food outside the nest. As ant societies last a long time and make easily defended nests that are climatically equable it is possible for the young to be legless grubs, but whether they have evolved from a normal six-legged state or whether they were already legless in a pre-social evolutionary stage, perhaps as parasites, is uncertain. They can do little more than arch their bodies, suck and digest the food that the adults give them, and urinate. They are, however, well designed for growth and when, after several moults to allow for expansion, they have stored enough raw materials, all their food residues are ejected at one go and the buds of the rudimentary adult inside grow and join up. After one more moult a further metamorphosing stage is produced (the pupa) from which the final adult later emerges.

      In the tropics ants have evolved enormous societies with nearly every conceivable way of living in the terrestrial habitat. Many thousands of species are already known and more doubtless remain to be discovered. Here in north-west Europe ants are by no means so spectacular but their social organization is impressive. They live nearly everywhere and play an important part in natural processes.

      DEVELOPMENT OF THE SOCIETY

      Ant societies maintain