Preface
mental changes (see Chapter 8 on heteroblasty by D. Lee and J. Richards),
but has led to neither uniformity in photosynthetic characteristics (see
Chapter 7 by
A.
Castellanos and Chapter 9 by
A.
H. Teramura, W. G. Gold
and I. N. Forseth), nor in secondary chemistry (see Chapter 10 by M. P.
Hegarty, E. E. Hegarty and A. H. Gentry). Although not considered in this
book, vine stems do not fare well in fires, perhaps because they are thin and
not covered with thick layers of insulating bark and thus heat up rapidly. In
regard to temporal patterns in
leaf,
flower, and fruit production, vines are
fairly uniform in some forests and varied in others (see Chapter 14 by P. A.
Opler, H. G. Baker and G. W. Frankie). Slender vine stems often support
masses of leaves equivalent to those supported by much larger diameter trees
but lack the trees' storage capacity; many vines, particularly those from arid
environments, have storage tissues below ground in the form of modified
stems and roots (see Chapter 6 by H. A. Mooney and B. L. Gartner and
Chapter 12 by P. W. Rundel and T. Franklin). Thin vines with large leaf
masses might also be constrained by lack of volume in which to include
phloem tissue.
In order to climb, vines need to locate and somehow grasp, lean, or hook
onto suitable supports. Failure to encounter a trellis leads to the demise of
many forest vines. Their chances of success are improved by production of
long, leafless leader shoots that circumnutate and tendrils that contract after
clasping onto something (see Chapter
13
by
E.
E. Hegarty and Chapter
11
by
E. E. Hegarty and G. Caballe). Vines that can climb up the sides of trees or
even buildings with the aid of adventitious roots or adhesive tendrils do not
seem constrained by lack of potential supports but nonetheless are rare in
many forests for reasons that are not yet apparent.
The study of vine biology is important on economic grounds. Vines are
among the most important agricultural and silvicultural weeds (see Chapter
18 by F. E. Putz and Chapter 9 by A. H. Teramura, W. G. Gold and I. N.
Forseth). Vines are also of tremendous economic value as sources of
pharmaceutical chemicals, fruit, and dyes (see Chapter 16 by O. Phillips);
climbing palms provide the rattan canes of commerce (see Chapter 17 by S.
F.
Siebert).
Much remains to be learned about vines; hopefully this volume will
provide a solid foundation upon which future studies will be based. In
particular, information on the ecosystem function of vines is lacking. Given
their abundance, rapid growth rates, and voluminous leaf production, vines
certainly must play important roles in nutrient cycling. Environmental
concerns about silvicultural prescriptions calling for vine removal also need
to be considered in the light of their potential importance as food and inter-
crown pathways for animals. Vines can be a nuisance or a godsend but
regardless of your perspective, they are clearly worthy of further study.
XIV
Cambridge University Press
978-0-521-39250-1 - The Biology of Vines
Edited by Francis E. Putz and Harold A. Mooney
Frontmatter
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