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

Comparative migration, growth and development of Typhlocoelum cucumerinum sisowi in dabbling ducks and Typhlocoelum cucumerinum cucumerinum in diving ducks

Parasitology ◽  
1982 ◽  
Vol 84 (2) ◽  
pp. 333-350 ◽  
Author(s):  
Marilyn E. Scott ◽  
M. E. Rau ◽  
J. D. McLaughlin
Keyword(s):  
Life Cycle ◽  
Life Span ◽  
Definitive Host ◽  
Host Species ◽  
Growth And Development ◽  
Abdominal Cavity ◽  
Dabbling Ducks ◽  
Diving Ducks ◽  
Air Sacs ◽  
Aythya Valisineria

SUMMARYExperimental infections of mallards (Anas platyrhynchos L.) with Typhlocoelum cucumerinum sisowi (Skrjabin, 1913) and of canvasbacks (Aythya valisineria (Wilson)) with Typhlocoelum cucumerinum cucumerinum (Rudolphi, 1809) revealed significant differences in various parameters of the life-cycle in the definitive host. Both T. c. sisowi and T. c. cucumerinum migrate to the trachea via the abdominal cavity, air sacs and lungs, although T. c. cucumerinum migrate more quickly and more synchronously than T. c. sisowi. Typhlocoelum c. sisowi has a shorter expected life-span than T. c. cucumerinum but grows and reaches maturity more quickly than T. c. cucumerinum. Evidence suggests that T. c. cucumerinum has a higher fecundity than T. c. sisowi. These differences in the patterns of migration, growth and development are related not only to differences between the two host species but also to differences intrinsic to the parasites, and serve to provide biological support for considering them as separate sub-species.

Studies on the life-cycle ofHimasthla militaris(Trematoda: Echinostomatidae): influence of temperature and salinity on the life-span of the miracidium and the infection of the first intermediate host,Hydrobia ventrosa

Parasitology ◽  
1982 ◽  
Vol 84 (1) ◽  
pp. 131-135 ◽  
Author(s):  
R. Vanoverschelde
Keyword(s):  
Life Cycle ◽  
Life Span ◽  
Intermediate Host ◽  
Half Life ◽  
Snail Host ◽  
Influence Of Temperature ◽  
First Intermediate Host

SUMMARYThe influence of temperature and salinity on miracidial longevity and miracidial infectivity of the digenean,Himasthla militaris, has been examined. At 14, 25 and 30 °C the half-life of the miracidia was 1200, 630 and 420 min respectively, and infection of the first intermediate host,Hydrobia ventrosa, only occurred at 25 and 30 °C, for both temperatures 52% became infected. In the range 2·1 to 34‰ (2·1, 4·2, 8·5, 17 and 34‰) the miracidia had a minimal and maximal half-life of 60 and 630 min in water with a salinity of 2·1 and 17‰ respectively, while the infection of the snail host was possible only in water with a salinity of 8·5 and 17‰.

scholarly journals Curiosity, responsibility, hospitality: Scenes of interreligious friendship

2019 ◽  
Vol 47 (1) ◽  
pp. 45-50
Author(s):  
Anita Houck
Keyword(s):  
Life Cycle ◽  
Life Span ◽  
Professional Responsibility ◽  
Actual Truth ◽  
Single Person

Three themes in interreligious friendship are illustrated through stories from the author’s childhood and adulthood. Curiosity takes different forms across the life span but can continue to lead to relationships both personal and professional. Responsibility asks that one represent one’s own tradition accurately, including in recognizing that no single person can speak for a religion. Hospitality is understood both as interpersonal welcome and, drawing from Catherine Cornille, as recognizing and welcoming “actual truth” in other religions. Hospitality offers and sustains friendship despite societal obstacles and individual failures. Throughout the life cycle, the experience of envying others’ religiosity can both inspire friendship and refine how one understands and practices one’s own religious commitments.

Bionomics of Bracon ?hancocki (Wilkinson) (Hymenoptera: Braconidae), a Larval Parasite of Cydia Ptychora (Meyrick) (Lepidoptera: Tortricidae) in Nigeria

1982 ◽  
Vol 72 (4) ◽  
pp. 567-572 ◽  
Author(s):  
J. I. Olaifa ◽  
A. E. Akingbohungbe
Keyword(s):  
Life Cycle ◽  
Life Span ◽  
Larval Parasite ◽  
Preoviposition Period ◽  
Cydia Ptychora ◽  
Major Pest ◽  
Preferred Hosts

AbstractBracon ?hancocki (Wlkn.) is a larval ectoparasite of Cydia ptychora (Meyr.), a major pest of cowpea at Ile-Ife, Nigeria. Parasitism occurred in the field all the year round, varying from 0 to 65·9% and with the highest incidence from September to February. In the laboratory, the fecundity of the parasite was low, averaging about six eggs per female. The life-cycle was completed in ten days. Mating occurred soon after emergence, and the preoviposition period lasted about 2–3 days. Unmated females rarely laid eggs, and their life-span averaged six days as compared to 14 days for mated females. The female:male ratio was 2:1. The parasite rarely attacked previously paralysed hosts, and the preferred hosts were the older, larger larvae. A description of the egg and larvae is given.

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.

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