Forty Years of Genecology
J . H E S L O P - H A R R I S O N
Department of Botany. University of Birmingham.
England
I . The Scope and Concepts of Genecology .................................... 159
A . Introduction ...................................................... 159
B . SomeBasicPropositions ............................................ 160
C . EcotypesorEcoclines? .............................................. 162
D . Genecologicd Categories ............................................ 164
E . GenecologicalTechnique ............................................ 168
G . Geneoologicd Differentiation: Generalizations .......................... 187
I1 . Evolutionary Aspects of Genecological Differentiation ...................... 193
F . Geneoological Differentiation: Some Illustrative Examples .............. 173
H . Genetic Basis of Ecotypic Differences .................................. 189
A . Introduction: the Origin, Storage and Release of Variation ................ 193
B . ModesofSelection .................................................. 196
C . Versatile Reproductive Systems ...................................... 201
D . Isolation and Genecological Differentiation ............................ 204
E . Monotopic and Polytopic Origin and the Retention of Racial Identity ...... 210
F . Plasticity, Genetic Assimilation and Conditioning ...................... 213
111 . Physiological Aspects of Genecologioal Differentiation ...................... 217
A . Introduction ...................................................... 217
B . Edaphic Adaptation ................................................ 219
C . Adaptation to Soil Moisture Stress .................................... 223
D . Adaptation to Light Intensity ........................................ 224
E . Adaptationtoclimate .............................................. 227
I V . Conclusions .......................................................... 237
References ................................................................ 240
I . THE SCOPE AND CONCEPTS OF GENECOLOGY
A . INTRODUCTION
The term genecology was applied originally by Turesson (1923) to the
study of the infraspecific variation of plants in relation to environment .
Genecology was in this way established as a branch of ecology. comparable with and in various respects complementary to autecology and
synecology. the former concerned with the environmental relations of
individual species and the latter with those of plant communities .
Turesson’s early publications (1922a. 1922b. 1923. 1925. 1930) illustrate
the synthesis of approaches - genetical. ecological and taxonomical-
J . H E S L O P - H A R R I S O N
Department of Botany. University of Birmingham.
England
I . The Scope and Concepts of Genecology .................................... 159
A . Introduction ...................................................... 159
B . SomeBasicPropositions ............................................ 160
C . EcotypesorEcoclines? .............................................. 162
D . Genecologicd Categories ............................................ 164
E . GenecologicalTechnique ............................................ 168
G . Geneoologicd Differentiation: Generalizations .......................... 187
I1 . Evolutionary Aspects of Genecological Differentiation ...................... 193
F . Geneoological Differentiation: Some Illustrative Examples .............. 173
H . Genetic Basis of Ecotypic Differences .................................. 189
A . Introduction: the Origin, Storage and Release of Variation ................ 193
B . ModesofSelection .................................................. 196
C . Versatile Reproductive Systems ...................................... 201
D . Isolation and Genecological Differentiation ............................ 204
E . Monotopic and Polytopic Origin and the Retention of Racial Identity ...... 210
F . Plasticity, Genetic Assimilation and Conditioning ...................... 213
111 . Physiological Aspects of Genecologioal Differentiation ...................... 217
A . Introduction ...................................................... 217
B . Edaphic Adaptation ................................................ 219
C . Adaptation to Soil Moisture Stress .................................... 223
D . Adaptation to Light Intensity ........................................ 224
E . Adaptationtoclimate .............................................. 227
I V . Conclusions .......................................................... 237
References ................................................................ 240
I . THE SCOPE AND CONCEPTS OF GENECOLOGY
A . INTRODUCTION
The term genecology was applied originally by Turesson (1923) to the
study of the infraspecific variation of plants in relation to environment .
Genecology was in this way established as a branch of ecology. comparable with and in various respects complementary to autecology and
synecology. the former concerned with the environmental relations of
individual species and the latter with those of plant communities .
Turesson’s early publications (1922a. 1922b. 1923. 1925. 1930) illustrate
the synthesis of approaches - genetical. ecological and taxonomical-