Life Course, life cycle, life history, life span and life stage

2013 ◽  
pp. 1167-1167 ◽  
Author(s):  
Duane F. Alwin
Keyword(s):  
Life History ◽  
Life Cycle ◽  
Life Course ◽  
Life Span ◽  
Life Stage ◽  
Cycle Life

Critical Points in Time and Their Influence on Life Cycle, Life Span and Aging

Insect Aging ◽  
1986 ◽  
pp. 9-22 ◽  
Author(s):  
K. P. Sauer ◽  
C. Grüner ◽  
K.-G. Collatz
Keyword(s):  
Life Cycle ◽  
Life Span ◽  
Critical Points ◽  
Cycle Life

THE ECOLOGY AND LIFE HISTORY OF RETUSA OBTUSA (MONTAGU) (GASTROPODA, OPISTHOBRANCHIA)

1967 ◽  
Vol 45 (4) ◽  
pp. 397-405 ◽  
Author(s):  
S. Tyrell Smith
Keyword(s):  
Life History ◽  
Life Cycle ◽  
Life Span ◽  
High Tide ◽  
Breeding Period ◽  
Protandrous Hermaphrodite ◽  
History Of ◽  
Natural Breeding ◽  
One Year ◽  
Short Time

The habitat, diet, life history, and reproductive cycle of Retusa obtusa were investigated over a period of [Formula: see text] years in a population found in the Inner Harbour at Barry, Glamorgan, U.K. A technique was devised for extracting Retusa from the mud of this area. R. obtusa occurs in the topmost 3.5 cm of fine mud covering Barry harbor, which is immersed by the sea for only a short time at each high tide. The principal prey was found to be Hydrobia ulvae.The life cycle was found to be annual, the adults dying in spring, following the natural breeding season. Occasionally, a short extra breeding period occurs in the fall. The life span in no case greatly exceeded one year. Retusa is a protandrous hermaphrodite, and copulates in the fall. The eggs mature through the late fall and the winter, a few at a time, until oviposition occurs in the spring. The average number of eggs produced per individual was 33, deposited in 1–4 egg batches. Development is direct.

scholarly journals Age and growth of three Odontesthes species from Southern Brazil (Atherinopsidae), with reference to phylogenetic constraints in their life-history

2003 ◽  
Vol 63 (4) ◽  
pp. 567-578 ◽  
Author(s):  
F. G. Becker ◽  
W. Bruschi Jr. ◽  
A. C. Peret
Keyword(s):  
Life History ◽  
Life Cycle ◽  
Life Stage ◽  
Age And Growth ◽  
Cycle Duration ◽  
Generic Level ◽  
Interspecific Differences ◽  
Life History Characteristics ◽  
Phylogenetic Constraints ◽  
Phylogenetic Hypotheses

The age and growth of three silverside species are described, and a discussion on possible phylogenetic constraints on life-history characteristics is presented. Samples were collected monthly between March 1992 and February 1993 in three freshwater coastal lakes. Standard length-total length (Ls-Lt) and weight-length (Wt-Lt) relationships studied showed interspecific differences in comparisons between juveniles and adults, males and females. Age was determined by scales. The three species presented a life-cycle duration of 4 to 5 years, with growth coefficients values (K) between 0.37 and 0.63, and asymptotic lengths between 211 and 257 mm. Some interspecific differences may be useful for distinguishing between species (sexual and life-stage related patterns in Ls-Lt and Wt-Lt). The observed life-cycle ranges and maximum sizes were compared to those of other silversides and revealed a pattern coherent with available phylogenetic hypotheses at the supra-generic level, indicating that some life-history characteristics may be subject to phylogenetic constraints.

Life Cycle, Life Course, Lifespan

2018 ◽  
pp. 55-70
Author(s):  
José Luis Iparraguirre
Keyword(s):  
Life Cycle ◽  
Life Course ◽  
Cycle Life

NOTES ON THE LIFE HISTORY AND MORPHOLOGY OF CEPHENEMYIA JELLISONI TOWNSEND AND LIPOPTENA DEPRESSA SAY, TWO DIPTEROUS PARASITES OF THE COLUMBIAN BLACK-TAILED DEER (ODOCOILEUS HEMIONUS COLUMBIANUS (RICHARDSON))

1943 ◽  
Vol 21d (6) ◽  
pp. 171-187 ◽  
Author(s):  
Ian McT. Cowan
Keyword(s):  
Life History ◽  
Life Cycle ◽  
Life Span ◽  
Odocoileus Hemionus ◽  
Odocoileus Hemionus Columbianus ◽  
Larval Stages ◽  
Internal Parasite ◽  
First Instar ◽  
Single Host ◽  
Cephenemyia Jellisoni

Material derived from deer taken on southern Vancouver Island, B.C., represents all larval stages of the nostril fly, Cephenemyia jellisoni Townsend. Description is given of the external morphology of the three larval stages and the puparium of this fly. The tracheary system of the first instar, and the cephalopharyngeal apparatus of all three are described and figured.In November and December first instar larvae were found in the nasopharynx of the host where they remained until after the moult. Until they reach maturity, second and third instar larvae occupy the retropharyngeal recesses of the deer. They leave the host by way of the nostrils and pupate in the ground.Observations on the life history and behaviour of Lipoptena depressa Say, both on and off the host, are given. It is postulated that the life span on the host varies from 8 to 13 months and that during this period from four to seven larvae are produced. Larvae do not pupate on the host but fall to the ground as soon as they are liberated. Infestations on a single host may consist of more than 2000 flies; under such circumstances the deer evinces discomfort. As yet this fly is not known to be involved in the life cycle of any internal parasite of the deer.

Interannual variability in life-stage specific survival and life history diversity of coho salmon in a coastal Oregon basin

2021 ◽  
Author(s):  
Kim K Jones ◽  
Trevan J Cornwell ◽  
Daniel L. Bottom ◽  
Staci Stein ◽  
Steven Starcevich
Keyword(s):  
Population Dynamics ◽  
Life History ◽  
Life Cycle ◽  
Interannual Variability ◽  
Coho Salmon ◽  
Life Stage ◽  
Full Range ◽  
Life Cycle Approach ◽  
Surplus Production ◽  
Life History Patterns

We quantified the population dynamics and life history diversity of seven brood years of coho salmon using a life-cycle approach. Four life history patterns, composed of fry, fry–nomad, parr, and yearling migrants indicated the importance of connectivity and access to a full range of freshwater and estuarine rearing environments through the year. Survival of each life history type varied annually with the yearling migrants contributing an average of 70% to the spawners in all but one return year. Fifty eight percent of the spawners of the 2013 return year had an estuarine rearing strategy, primarily parr migrants that overwintered in the estuary. Fry migrants, thought to be surplus production, were consistently observed in the estuary and represented in the returning spawners. The annual contribution of alternative rearing strategies to the spawners may support the resilience and viability of the population. We recommend that life cycle models of coho salmon account for the contribution of estuary migrants to the productivity and persistence of coho salmon in support of management and restoration of populations.

Studies on Demodex folliculorum Simon (1842). I. Life history

Parasitology ◽  
1961 ◽  
Vol 51 (1-2) ◽  
pp. 181-192 ◽  
Author(s):  
S. G. Spickett
Keyword(s):  
Life History ◽  
Life Cycle ◽  
Life Span ◽  
Statistical Methods ◽  
Skin Surface ◽  
Birkbeck College ◽  
Demodex Folliculorum ◽  
Histological Data ◽  
History Of

1. Histological data are given about the location and frequency of the different stages of the life history of D. folliculorum in the pilo-sebaceous apparatus of man. These data are examined statistically and the relative durations of each stage and their movements in the follicle are deduced from them.2. A method of in vitro culture is described and data are given about the longevity of the various stages of the life history.3. Experiments on the behaviour of the different motile stages of the mite are described. It is concluded that the deutonymph is the distributive stage, and that distribution occurs over the skin surface.4. The life history is reconstructed by a synthesis of the evidence presented. The life-cycle lasts approximately 14½ days, the life span of each stage of it being: ovum 60 hr., larva 36 hr., protonymph 72 hr., deutonymph 60 hr., adult 120 hr. Interval between copulation and oviposition 12 hr.This work was largely carried out in the Department of Pathology of the Institute of Dermatology, London, and I wish to thank the Director of Pathology, Dr J. O. Oliver, for making available to me the facilities of his department, and for his advice and interest during the progress of the work. The photographs were prepared by Mr R. H. Lunnan of the Photographic Department of the Institute of Dermatology. I am indebted to the Dean of the Institute of Dermatology for permission to publish the photographs.I am grateful to Mr T. E. Hughes of the Department of Zoology, Birkbeck College, University of London, for his advice at all times, and to Miss Hilda Davies of the Department of Statistics, University of Sheffield, for help with statistical methods and to Mr W. Moseley, who prepared the text figures.Finally, I wish to express my thanks to Professor I. Chester Jones and Dr E. T. B. Francis of the Department of Zoology, University of Sheffield, for reading the manuscript and for their help in its preparation.

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