The life history of Diastylis sculpta Sars, 1871 (Crustacea: Cumacea) in Passamaquoddy Bay, New Brunswick

1976 ◽  
Vol 54 (5) ◽  
pp. 615-619 ◽  
Author(s):  
Susan Corey
Keyword(s):  
Life History ◽  
New Brunswick ◽  
Life Span ◽  
Shallow Water ◽  
Maximum Life Span ◽  
Summer Generation ◽  
Passamaquoddy Bay ◽  
History Of ◽  
The Mean ◽  
Gravid Females

Diastylis sculpta was collected from shallow water (1–15 m) in Passamaquoddy Bay over a 26-month period. D. sculpta produces a rapidly growing and developing summer generation between two successive winter generations. The overwintering generation releases young in mid-July and late August. The summer generation releases young in November. The mean fecundity of the summer-gravid females (78.4) is much greater than the mean fecundity (20.0) of the fall-gravid females. The maximum life-span is 5 months and 12 months for members of the summer and winter generations respectively.

The life history of Diastylis quadrispinosa (Sars, 1871) (Crustacea: Cumacea) in Passamaquoddy Bay, New Brunswick

1983 ◽  
Vol 61 (1) ◽  
pp. 108-111 ◽  
Author(s):  
S. Corey
Keyword(s):  
Life History ◽  
New Brunswick ◽  
Life Span ◽  
Late Fall ◽  
Passamaquoddy Bay ◽  
History Of ◽  
Gravid Females

Diastylis quadrispinosa inhabiting depths of 5–60 m in Passamaquoddy Bay breeds during late fall. Gravid females overwinter and release young during April to about mid-May. The life span is 5–6 months for males and 12–13 months for females. Females produce one brood with a mean fecundity of 67.2 (range, 26–149).

Life history of Mysis stenolepis Smith (Crustacea, Mysidacea)

1975 ◽  
Vol 53 (7) ◽  
pp. 942-952 ◽  
Author(s):  
T. Amaratunga ◽  
S. Corey
Keyword(s):  
Young Adults ◽  
Life History ◽  
New Brunswick ◽  
Shallow Water ◽  
Field Study ◽  
Sexual Maturity ◽  
Developmental Stages ◽  
Shallow Waters ◽  
Passamaquoddy Bay ◽  
History Of

A 17-month field study showed that Mysis stenolepis in Passamaquoddy Bay, New Brunswick lives for about 1 year. Young are released in shallow water early in spring and grow rapidly during the summer. In the fall, young adults migrate to deeper water where they reach sexual maturity. Transfer of sperm lakes place during winter in deeper regions of the Bay. soon after which the males die. Females survive and in spring migrate to shallow waters to release young after which they die. Females breed once and carry an average of 157 young per brood. Developmental stages of the postmarsupial young are described and discussed.

Aspects of the life history of Meganyctiphanes norvegica (M. Sars), Crustacea (Euphausiacea), in Passamaquoddy Bay

1974 ◽  
Vol 52 (4) ◽  
pp. 495-505 ◽  
Author(s):  
K. W. Hollingshead ◽  
S. Corey
Keyword(s):  
Life History ◽  
Life Span ◽  
Sexual Maturity ◽  
Gonadal Development ◽  
Age Group ◽  
Group I ◽  
Passamaquoddy Bay ◽  
History Of ◽  
Meganyctiphanes Norvegica ◽  
First Time

Monthly collections of Meganyctiphanes norvegica for a 19-monih period in Passamaquoddy Bay showed that these euphausiids were present in the bay in varying numbers from February to November but virtually disappeared in December and January. Sexual maturity is attained in 1 year with gonadal development taking 3 months, and spawning occurring in July and August. The resulting generation will breed and spawn for the first time the next July as age group I. Age group I grows from April until August; from September until March, very little growth occurs. After a second breeding and spawning, the animals die, having a life span of 2 years.

LIFE HISTORY STUDIES OF THE TOBACCO FLEA BEETLE, EPITRIX HIRTIPENNIS (MELSHEIMER) (COLEOPTERA: CHRYSOMELIDAE)

1987 ◽  
Vol 22 (3) ◽  
pp. 237-244 ◽  
Author(s):  
W. Davis Martin ◽  
G. A. Herzog
Keyword(s):  
Life History ◽  
Larval Stage ◽  
Flea Beetle ◽  
Pupal Stage ◽  
Adult Emergence ◽  
Adult Longevity ◽  
Male And Female ◽  
Controlled Conditions ◽  
History Of ◽  
The Mean

The life history of the tobacco flea beetle, Epitrix hirtipennis (Melsheimer) (= Epitrix parvula Fab.) was studied under the controlled conditions of 27 ± 2.8°C, 80 ± 6% and a 14L:10D photophase. Eggs matured in ca. 4 days, the larval stage, including 3 instars, developed in 13 days, prepupal development took 3 days and the pupal stage lasted approximately 5 days. There was a 24 day interval between oviposition and adult emergence. Females laid 3.1 eggs/day with a 13 day period between adult emergence and first oviposition. The mean number of total eggs/female was 138.6 ± 14.7. Female oviposition continued until a few days before death and adult longevity was approximately 70 days. A visual means of distinguishing between male and female beetles was also developed.

Aspects of the post-larval life history of Limnadia stanleyana King (Crustacea : Conchostraca)

1968 ◽  
Vol 16 (5) ◽  
pp. 885 ◽  
Author(s):  
JA Bishop
Keyword(s):  
Life History ◽  
Maximum Size ◽  
Isolated Populations ◽  
Growth Rings ◽  
Initial Stage ◽  
History Of ◽  
The Mean ◽  
Genetically Determined ◽  
Larval Life History ◽  
Moulting Cycle

L. stanleyana occurs in some rainwater pools near Sydney, N.S.W.. A study of the life history permits description of some aspects of the growth and morphological variation of the species. No growth rings are formed on the carapace during the initial stage of post-larval development. After this a ring is formed at each moult. Animals moult at regular intervals during the period of rapid growth which continues until after maturity. Moulting then occurs less frequently and eventually ceases in aged animals. The increment in size during each moulting cycle varies. It is greater in immature than is adult animals so although the increase in number of growth rings is linear the increase in size at this time is near exponential. The maximum size attained varies from generation to generation even in the same pool. There are sexual differences in the proportions of the carapace and damage due to injury increases markedly in aged animals. At 7.5�C third- and fourth-stage nauplii did not mature and scarcely grew during incubation for 336 hr. At 16, 20, and 25�C similar larvae grew to maturity in about 349, 161, and 109 hr respectively. The mean number of spines on telsons of animals from one pool is different from that of those from other pools. This situation merits further examination since the biological characteristics of the species facilitate the study of this quantitative, probably genetically determined, character in reproductively isolated populations.

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.

A multi-year and multi-site population study on the life history of Salamandrina perspicillata (Savi, 1821) (Amphibia, Urodela)

2008 ◽  
Vol 29 (2) ◽  
pp. 161-170 ◽  
Author(s):  
Carlo Utzeri ◽  
Claudio Angelini ◽  
Damiano Antonelli
Keyword(s):  
Life History ◽  
Body Size ◽  
Population Study ◽  
Climatic Conditions ◽  
Life History Variation ◽  
Differential Growth ◽  
History Of ◽  
Natural Pond ◽  
The Mean ◽  
Site Population

Abstract We studied nine populations of Salamandrina perspicillata for two to nine years and described the life history variation among these population. Despite experiencing similar climatic conditions, populations differed in mean body size: populations using still water bodies for oviposition were larger body-sized than those using brooks. One semi-natural pond was used by particularly small individuals and was probably recently colonised. The mean body size of ovipositing females varied from year to year. Measurements of individuals in successive years showed that the tail grew more than the trunk and this differential growth increased with age. Females did not oviposit every year and, within a given population, the number of ovipositing females varied widely from year to year.

Mortality patterns for a population of burrowing wolf spiders, Geolycosa domifex (Hancock), living in southern Ontario

1983 ◽  
Vol 61 (12) ◽  
pp. 2758-2767 ◽  
Author(s):  
D. J. McQueen
Keyword(s):  
Life History ◽  
Life Span ◽  
Additional Data ◽  
Field Site ◽  
Maximum Life Span ◽  
Wolf Spiders ◽  
Southern Ontario ◽  
Density Dependent ◽  
Density Dependent Mortality ◽  
Dependent Mortality

A population of burrowing wolf spiders, Geolycosa domifex (Hancock), was studied near Toronto, Ontario, between 1974 and 1979. Some preliminary life history and mortality information for this population has been published previously by D. J. McQueen. In the paper that follows, these results are updated and additional data pertaining to density-dependent mortality and the effects of the parasite Pterodontia flavipes Grey are presented. At the Uxbridge field site, the maximum life span for G. domifex was 3 years and they were semelparous. On average, the wasp Anoplius relativus (Fox) killed 18.7% of the population at age 24 months and >98% of the female spiders after they had reproduced at age 36 months. The acrocerid fly, P. flavipes killed 40.4% of the population at age 22 months and an average of 17.5% of the population at age 34 months (before reproduction). Younger spiders were not killed by either A. relativus or P. flavipes. An analysis of survivorship with respect to burrow spacing suggested that there was no density-dependent mortality.

Experimental studies on the transmission dynamics of the cercariae of Echinoparyphium recurvatum (Digenea: Echinostomatidae)

Parasitology ◽  
1983 ◽  
Vol 87 (1) ◽  
pp. 167-174 ◽  
Author(s):  
N. A. Evans ◽  
D. M. Gordon
Keyword(s):  
Life Span ◽  
Intermediate Host ◽  
Experimental Studies ◽  
Intermediate Hosts ◽  
Maximum Life Span ◽  
Age Dependent ◽  
Second Intermediate Host ◽  
The Mean ◽  
The Relationship ◽  
First Intermediate Host

SUMMARYAge-dependent survival and infectivity characteristics are described for the cercariae of Echinoparyphium recurvatum. At 18 °C the maximum life-span of the cercariae was 48 h and 50% survival occurred at 30·5 h. Infectivity of cercariae to the second intermediate host, Lymnaea peregra was maximal approximately 2 h after emission from the first intermediate host and it subsequently declined to zero at 19 h. It is suggested that the period of sub-maximal infectivity at the beginning of the cercarial life-span may represent a phase during which dispersal is an important function of the larvae. The relationship between infective stage density and establishment success was linear up to densities equivalent to 5000 cercariae/1. At higher cercarial densities the proportion of parasites establishing in second intermediate hosts declined progressively with increasing cercarial density. The mean number of parasites establishing/host increased linearly with increasing host size.

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