OBSERVATIONS ON THE LIFE HISTORY OF APAMEA VELATA WLK

1944 ◽  
Vol 76 (11) ◽  
pp. 223-225 ◽  
Author(s):  
V. G. Dethier
Keyword(s):  
Life History ◽  
Second Generation ◽  
Widespread Species ◽  
History Of

To the best of the writer's knowledge, complete descriptions of the larva of this widespread species do not occur in the literature. The larva, one of the most frequently encountered grass-feeders, may be collected abundantly by sweeping lush grasslands. It is first noticed in numbers early in May. All individuals are small, having hatched from eggs laid by moths which had overwintered as pupae. By the end of May the majority have pupated, and adults appear on the wing in June. From the eggs of these developes a second generation. A third appears in August.

Influence of a reservoir with surface release on the life history of the mayfly Heterocloeon curiosum (McDunnough) (Ephemeroptera: Baetidae)

1981 ◽  
Vol 59 (2) ◽  
pp. 305-314 ◽  
Author(s):  
Boris C. Kondratieff ◽  
J. Reese Voshell Jr.
Keyword(s):  
Life History ◽  
Benthic Macroinvertebrates ◽  
Temperature Regime ◽  
Life Histories ◽  
Second Generation ◽  
Larval Instars ◽  
History Of ◽  
Lake Anna

The life history of Heterocloeon curiosum was compared in the impounded North Anna River (NAR) and the free-flowing South Anna River (SAR) in Virginia, U.S.A. The study site on the NAR was 32 km below Lake Anna, a surface-release reservoir. Heterocloeon curiosum was bivoltine in both rivers with two summer generations and probable overwintering in the egg stage. It passed through 10 larval instars (range 9–12) in both rivers. The density of larvae was twice as great in the SAR as the NAR. Factors which may have contributed to the lesser success of H. curiosum in the NAR included bottom scouring produced by sudden increases in discharge, absence of the macrophyte Podostemum, quality of available food, and alterations of the temperature regime. Of these four factors, temperature probably had the most significant effect. The emergence of the second generation was 1 month later in the NAR because the reservoir delayed the normal seasonal cooling of the river. The nonoptimal temperature regime appeared to significantly reduce the fecundity of H. curiosum in the NAR. Our data indicate that surface-release reservoirs may have subtle but significant effects on the life histories of benthic macroinvertebrates.

The life history of Chondrus crispus in culture

1972 ◽  
Vol 50 (5) ◽  
pp. 1055-1060 ◽  
Author(s):  
L. C-M. Chen ◽  
J. McLachlan
Keyword(s):  
Life History ◽  
Second Generation ◽  
Dorsal Surface ◽  
Similar Rate ◽  
Chondrus Crispus ◽  
Basal Disc ◽  
Male And Female ◽  
Rate Of Growth ◽  
History Of ◽  
Sexually Mature

The life history of the rhodophycean alga, Chondrus crispus, was completed in culture in about 20 months. Plants established from tetraspores formed male and female gametophytes and subsequently carposporophytes; carpospores in turn gave rise to plants with mature tetrasporangia. Tetraspores from these resulted in second generation gametophytes. Carpospores of plants from nature developed into tetrasporophytes; gametophytes derived from the tetraspores became sexually mature within a year. Sporophytic and gametophytic plants were, as expected, morphologically similar. Rate of growth of plants in cultures was comparable with published observations made on plants in nature. Preliminary experiments showed that, in culture, regeneration can occur from both the erect frond and the basal disc. In the latter, erect fronds may arise from any point on the dorsal surface of the disc.

LIFE HISTORY OF THE WOOLLY PINE SCALE PSEUDOPHILIPPIA QUAINTANCII COCKERELL (HOMOPTERA: COCCIDAE) IN LOBLOLLY PINE SEED ORCHARDS

1989 ◽  
Vol 24 (3) ◽  
pp. 365-372 ◽  
Author(s):  
Stephen R. Clarke ◽  
Gary L. DeBarr ◽  
C. Wayne Berisford
Keyword(s):  
Life History ◽  
Loblolly Pine ◽  
Coastal Plain ◽  
First Generation ◽  
Second Generation ◽  
Seed Orchards ◽  
Average Survival ◽  
History Of

The woolly pine scale, Pseudophilippia quaintancii Cockerell, had 2 generations per year in the Georgia coastal plain. Crawler activity peaked in late March-early April and late May to mid-June. First-generation males were wingless and emergence began in late April. Second-generation males were alate and their emergence peaked in early July. Populations of P. quaintancii increased during the first generation and dispersal occurred during the second. Fecundity averaged about 500 offspring per female. Populations were significantly affected by tree clone and crown level, with higher average survival in the upper crown. Parasitism of the woolly pine scale was low.

Telling Diaspora Stories: theoretical and methodological reflections on narratives of migrancy and belongingness in the second generation

2009 ◽  
Vol 6 (2) ◽  
pp. 143-153 ◽  
Author(s):  
Anastasia Christou
Keyword(s):  
Life History ◽  
Second Generation ◽  
Life Stories ◽  
Narrative Research ◽  
Social Experiences ◽  
Biographical Approach ◽  
The Subject

This article explores the theoretical and methodological implications of the study of second generation migration through the use of life stories, a narrative and biographical approach. It presents a theoretical contextualisation of life history research in addressing the direction it has taken in the study of migration and identity in order to problematise how the subject and subjectivities in narrative research have been framed by social categorisations such as gender, ethnicity, class as well as social experiences such as trauma, exile, memory and imagination. The paper develops the analytical contribution of researching the biographicity of everyday migrant lives. 

Experimental life history of Echinostoma cinetorchis

1990 ◽  
Vol 28 (1) ◽  
pp. 39 ◽  
Author(s):  
S H Lee ◽  
J Y Chai ◽  
S T Hong ◽  
W M Sohn
Keyword(s):  
Life History ◽  
History Of
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