Plant Population Structure and Aphid Parasitism: Changes in Barley Monocultures and Mixtures

1979 ◽  
Vol 16 (1) ◽  
pp. 259 ◽  
Author(s):  
P. N. Windle ◽  
Eldon H. Franz
Keyword(s):  
Population Structure ◽  
Plant Population ◽  
Plant Population Structure

scholarly journals Does fine scale spatiotemporal variation in seed rain translate into plant population structure?

Oikos ◽  
2021 ◽  
Author(s):  
Georg Gratzer ◽  
Mario B. Pesendorfer ◽  
Frederik Sachser ◽  
Laura Wachtveitl ◽  
Ursula Nopp‐Mayr ◽  
...  
Keyword(s):  
Population Structure ◽  
Spatiotemporal Variation ◽  
Plant Population ◽  
Seed Rain ◽  
Fine Scale ◽  
Plant Population Structure

scholarly journals Climatic stress mediates the impacts of herbivory on plant population structure and components of individual fitness

2013 ◽  
Vol 101 (4) ◽  
pp. 1074-1083 ◽  
Author(s):  
Allison M. Louthan ◽  
Daniel F. Doak ◽  
Jacob R. Goheen ◽  
Todd M. Palmer ◽  
Robert M. Pringle
Keyword(s):  
Population Structure ◽  
Plant Population ◽  
Climatic Stress ◽  
Individual Fitness ◽  
Plant Population Structure

scholarly journals Plant population structure and insect herbivory on Solanum mauritianum Scopoli (Solanaceae) in southern Brazil: a support to biological control

2009 ◽  
Vol 52 (2) ◽  
pp. 413-420 ◽  
Author(s):  
Deise Mari Barboza ◽  
Márcia Cristina Mendes Marques ◽  
José Henrique Pedrosa-Macedo ◽  
Terence Olckers
Keyword(s):  
Biological Control ◽  
Population Structure ◽  
Insect Herbivory ◽  
Southern Brazil ◽  
Biological Control Agents ◽  
Aggregate Distribution ◽  
Young Leaves ◽  
Solanum Mauritianum ◽  
Plant Population Structure ◽  
Diameter Classes

Solanum mauritianum Scopoli (Solanaceae), a native Brazilian shrub, has become naturalized and invasive in several countries. In South Africa, where invasions are severe, herbivorous insects that attack S. mauritianum in its native area have been considered for introduction as biological control agents. To assess the action of such herbivores on the plant, studies were carried out on a population of S. mauritianum in an area undergoing regeneration in southern Brazil. An analysis of the structure of that population was performed, as well as of herbivory by insects, in particular of Anthonomus (Curculionidae). The population structure showed an "inverted J" pattern in diameter classes, but not in height classes. Individual plants showed an aggregate distribution. The damage caused by Anthonomus did not amount to the loss of a large leaf area, but since it was inflicted on young leaves and in a large proportion, could lead to the survival decrease.

Population structure and quantitative characteristics of Tetracentron sinense (Trochodendraceae) in Leigong Mountain Nature Reserve, China

2020 ◽  
Vol 98 (1) ◽  
pp. 86-100
Author(s):  
Huan Zhang ◽  
Fan Duan ◽  
Yang Li ◽  
Qinqin Wang ◽  
Xueheng Lu ◽  
...  
Keyword(s):  
Population Structure ◽  
Mortality Rate ◽  
Nature Reserve ◽  
Early Stage ◽  
Research Question ◽  
Natural Populations ◽  
Current Status ◽  
Survival Curves ◽  
Plant Population Structure ◽  
Tetracentron Sinense

Background: Knowledge of plant population structure facilitates conservation, management, and utilization of endangered plants. Research question: What is the current status of the natural populations of Tetracentron sinense in Leigong Mountain Nature Reserve (LMNR) and what future population development trends can be predicted? Studied species: Tetracentron sinense  Study site and period of research: T. sinense populations in LMNR in China in 2018. Methods: The population structure and quantity dynamics of four typical patches were studied using static life tables, survival curves, survival analyses, and time series analyses.  Results: The age structures of the T. sinense populations were spindle-shaped, with few seedlings and saplings, and Deevey type II and Ⅲ survival curves. The mortality rate (qx) of each patch increased quickly, and then plateaued, finally increasing again. Survival rate (Sx) showed a contrary trend to qx. Trends in cumulative mortality rate (F(i)), killing power (Kx), mortality density (f(ti)), and hazard rate (λ(ti)) with increasing age class were similar: increasing at a younger age, gradually stabilizing in middle age, and then increasing slightly in older age. The number of individuals in these T. sinense populations was predicted to decrease sharply in future, with younger individuals being seriously deficient. The results showed that the natural populations of T. sinense in the LMNR were relatively stable but were in an early stage of decline.  Conclusions: The lack of younger individuals might reflect a bottleneck for regeneration of T. sinense populations, leading to a decline in population size.

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