Age Structure Patterns in Abies amabilis Stands of the Cascade Mountains

1991 ◽  
Vol 125 (2) ◽  
pp. 331 ◽  
Author(s):  
Mark V. Wilson
Keyword(s):  
Age Structure ◽  
Cascade Mountains ◽  
Abies Amabilis ◽  
Structure Patterns

Age structure

2012 ◽  
Author(s):  
Odo Diekmann ◽  
Hans Heesterbeek ◽  
Tom Britton
Keyword(s):  
Public Health ◽  
Social Behavior ◽  
Age Structure ◽  
Health Administration ◽  
Public Health Administration ◽  
Vaccination Strategies ◽  
Human Social Behavior ◽  
Age Structured ◽  
Structure Patterns ◽  
Special Case

This chapter elaborates on the special case of age structure. Especially in the context of infectious diseases among humans, “age” is often used to characterize individuals. Partly this reflects our system of public health administration (and, perhaps, our preoccupation with age). There is, however, a more “mechanistic” reason to incorporate age structure: patterns of human social behavior and sexual activity correlate with age. In addition, the effect that the infective agent has on the host sometimes depends heavily on the age of the host (e.g., in polio) or it may depend on another aspect of the host, such as pregnancy, which correlates with age (e.g., in rubella). The chapter also discusses vaccination strategies as one of the major applied issues of age-structured epidemic models.

Influences of climate, fire, and topography on contemporary age structure patterns of Douglas-fir at 205 old forest sites in western Oregon

2009 ◽  
Vol 39 (8) ◽  
pp. 1518-1530 ◽  
Author(s):  
Nathan J. Poage ◽  
Peter J. Weisberg ◽  
Peter C. Impara ◽  
John C. Tappeiner ◽  
Thomas S. Sensenig
Keyword(s):  
Age Structure ◽  
Fire History ◽  
Forest Ecosystems ◽  
Regional Scale ◽  
Extended Period ◽  
Landscape Scale ◽  
Douglas Fir ◽  
Small Peak ◽  
Forest Sites ◽  
Structure Patterns

Knowledge of forest development is basic to understanding the ecology, dynamics, and management of forest ecosystems. We hypothesized that the age structure patterns of Douglas-fir at 205 old forest sites in western Oregon are extremely variable with long and (or) multiple establishment periods common, and that these patterns reflect variation in regional-scale climate, landscape-scale topography, and landscape-scale fire history. We used establishment dates for 5892 individual Douglas-firs from these sites to test these hypotheses. We identified four groups of old forest sites with fundamentally different Douglas-fir age structure patterns. Long and (or) multiple establishment periods were common to all groups. One group described old forests characterized by substantial establishment from the early 1500s to the mid-1600s, with decreasing establishment thereafter. Another group was characterized by peaks of establishment in the middle to late 1600s and in the late 1800s and early 1900s. A third group was characterized by a small peak of establishment in the mid-1500s and a larger peak in the middle to late 1800s. Characteristic of the fourth group was the extended period of Douglas-fir establishment from the late 1600s to the late 1800s. Group membership was explained moderately well by contemporary, regional climatic variables and landscape-scale fire history, but only weakly by landscape-scale topography.

Age structure, survivorship and life expectancy for future in Murree forests

2020 ◽  
Vol 53 (3) ◽  
Author(s):  
Afsheen Khan ◽  
S. Shahid Shaukat ◽  
Moinuddin Ahmed
Keyword(s):  
Life Expectancy ◽  
Age Structure

Age Structure and Some Growth Parameters in a Population of Bombina bombina (L., 1761) from Turkey

2018 ◽  
Vol 25 (3) ◽  
pp. 221 ◽  
Author(s):  
Ufuk Bülbül ◽  
Ali İhsan Eroğlu ◽  
Muammer Kurnaz ◽  
Zeynep Mutanoğlu Kaya ◽  
Halime Koç ◽  
...  
Keyword(s):  
Age Structure ◽  
Growth Parameters ◽  
Bombina Bombina

Life History Traits in a Population of Pelobates syriacus (Boettger, 1889) from Turkey

2020 ◽  
Vol 27 (4) ◽  
pp. 195-200
Author(s):  
Ufuk Bülbül ◽  
Halime Koç ◽  
Yasemin Odabaş ◽  
Ali İhsan Eroğlu ◽  
Muammer Kurnaz ◽  
...  
Keyword(s):  
Life History ◽  
Age Structure ◽  
Life History Traits ◽  
Spadefoot Toad ◽  
Males And Females

Age structure of the eastern spadefoot toad, Pelobates syriacus from the Kızılırmak Delta (Turkey) were assessed using phalangeal skeletochronology. Snout-vent length (SVL) ranged from 42.05 to 86.63 mm in males and 34.03 to 53.27 mm in females. Age of adults ranged from 2 to 8 years in males and 3 to 5 years in females. For both sexes, SVL was significantly correlated with age. Males and females of the toads reached maturity at 2 years of age.

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