Early summer distribution of Antarctic krill sexual development in the Scotia-Weddell region: a multivariate approach

Polar Biology ◽  
1992 ◽  
Vol 12 (1) ◽  
Author(s):  
Janine Cuzin-Roudy ◽  
JeanPhilippe Labat
Keyword(s):  
Sexual Development ◽  
Antarctic Krill ◽  
Early Summer ◽  
Multivariate Approach ◽  
Summer Distribution

The biology of Barleeia unifasciata (Gastropoda:Prosobranchia) in red algal turfs in S.W. Ireland

1982 ◽  
Vol 62 (2) ◽  
pp. 461-468 ◽  
Author(s):  
T. Southgate
Keyword(s):  
Sexual Development ◽  
Algal Species ◽  
Late Summer ◽  
Early Summer ◽  
First Year ◽  
Maximum Life Span ◽  
Red Algal ◽  
Second Year ◽  
Recruitment Period ◽  
Length Frequency Data

Variation in the abundance of Barleeia unifasciata is compared in several red algal species between June 1978 and June 1980 at Cooskeen Cove, Bantry Bay, Ireland. Population abundance in all algae varied seasonally, exhibiting a cycle of late-summer to autumn maxima, with winter to early summer minima. Greatest abundance was recorded in those algae which formed compact turf-like growths suitable for the entrapment of diatoms and detrital material and provided greatest shelter from wave-crash. Length frequency data showed the main recruitment period to be late June-October with a peak in August with juveniles present in all months of the year. Maximum life span was shown to be 2 years or more with only 15 % of the population surviving into the second year. Sexual development and reproductive cycle was determined for 0 + and 1 + animals. Mature males produced sperm continuously throughout the year. Not all 0 + females spawned in their first year. Summer spawning 0 + females exhibited reduced sexual activity in October and spawned again in the following summer. Some 1 + females spawned in winter and spring. Delayed sexual development in some individuals of both sexes was related to late hatching.

The spring/early summer distribution of Calanus spp. in the northern North Sea and adjacent areas

1999 ◽  
Vol 8 ◽  
pp. 138-152 ◽  
Author(s):  
H. Madden ◽  
D. Beare ◽  
M.R. Heath ◽  
J.G. Fraser ◽  
A. Gallego
Keyword(s):  
North Sea ◽  
Early Summer ◽  
Summer Distribution ◽  
Northern North Sea

Parenting and Adolescents’ Sexual Development in Western Societies

2011 ◽  
Vol 16 (1) ◽  
pp. 21-31 ◽  
Author(s):  
Hanneke de Graaf ◽  
Ine Vanwesenbeeck ◽  
Liesbeth Woertman ◽  
Wim Meeus
Keyword(s):  
Sexual Behavior ◽  
Parenting Styles ◽  
Sexual Development ◽  
Parental Support ◽  
Empirical Studies ◽  
Sexual Practices ◽  
Psychosexual Development ◽  
First Sexual Intercourse ◽  
Parenting Influences ◽  
Reciprocal Associations

This review examines associations between parenting styles and the psychosexual development of adolescents. Methods and results of empirical studies of associations between parental support, control, and knowledge and the sexual behavior and sexual health of adolescents are described and evaluated. The results show that, in general, higher scores on support, control, and knowledge relate to a delay of first sexual intercourse, safer sexual practices, and higher sexual competence. Despite the vast amount of literature on this subject, the majority of these studies focus on single dimensions of parenting and unidirectional parenting influences. This review generates hypotheses regarding interactions of different parenting styles and reciprocal associations between parents and their children. There is a need for more dynamic, dialectical studies of parenting, and children’s sexual development.

A Multivariate Approach to Analyze Ordinal Data Collected in Clinical Trials of Analgesic Agents

1979 ◽  
Vol 18 (03) ◽  
pp. 175-179
Author(s):  
E. Mabubini ◽  
M. Rainisio ◽  
V. Mandelli
Keyword(s):  
Clinical Trials ◽  
Multivariate Analysis ◽  
Analgesic Effect ◽  
Ordinal Data ◽  
Ordinal Scale ◽  
Multivariate Approach ◽  
Controlled Clinical Trials ◽  
Second Stage ◽  
Analgesic Agents ◽  
Relevant Factors

After pointing out the drawbacks of the approach commonly used to analyze the data collected in controlled clinical trials carried out to evaluate the analgesic effect of potential agents, the authors suggest a procedure suitable for analyzing data coded according to an ordinal scale. In the first stage a multivariate analysis is carried out on the codec! data and the projection of each result in the space of the most relevant factors is obtained. In the second stage the whole set of these values is processed by distribution-free tests. The procedure has been applied to data previously published by VENTAITBIDDA et al. [18].

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