6. Growth of Social Play with Peers during the Second Year of Life

1981 ◽  
pp. 72-80
1982 ◽  
pp. 157-166
Author(s):  
Carol O. Eckerman ◽  
Judith L. Whatley ◽  
Stuart L. Kutz

1975 ◽  
Vol 11 (1) ◽  
pp. 42-49 ◽  
Author(s):  
Carol O. Eckerman ◽  
Judith L. Whatley ◽  
Stuart L. Kutz

Behaviour ◽  
1973 ◽  
Vol 47 (1-2) ◽  
pp. 48-66 ◽  
Author(s):  
A.S. Chamove

AbstractTo analyze the antecedent conditions of the together-together syndrome, 6 subjects were reared in pairs, 6 in pairs separated on alternate weeks, 6 in pairs which changed in composition weekly, 6 in a group of 6, and 6 in individual cages. When tested in groups of 6 during the first year of life and with infants, juveniles, and adults during the second year of life, it was found that (a) self-play and social play increased and self-cling and aggression decreased as an increasing function of the number of rearing partners; (b) social cling was greatest in subjects reared constantly with the same animals, and was independent of the amount of play exhibited by a group.


2006 ◽  
Vol 37 (S 1) ◽  
Author(s):  
E Rodríguez ◽  
M Bellotti ◽  
S Liendo ◽  
S Napoli ◽  
MM Contreras ◽  
...  

Author(s):  
C. Fernandez-Baizan ◽  
Miguel Angel Prieto ◽  
J. A. Martinez ◽  
J. L. Arias ◽  
M. Mendez

Infancy ◽  
2010 ◽  
Vol 15 (3) ◽  
pp. 324-335 ◽  
Author(s):  
Amy C. MacPherson ◽  
Chris Moore

2011 ◽  
Vol 49 (13) ◽  
pp. 3677-3688 ◽  
Author(s):  
Alessandra Sansavini ◽  
Annalisa Guarini ◽  
Silvia Savini ◽  
Serena Broccoli ◽  
Laura Justice ◽  
...  

1986 ◽  
Vol 37 (1) ◽  
pp. 95 ◽  
Author(s):  
IC Potter ◽  
JW Penn ◽  
KS Brooker

The absence of marine records for M. dalli below latitude 31�S., together with data on gonadal stages and spermatophore deposition on females of this species in the Swan estuary, provide very strong indications that the western school prawn typically breeds in estuarine environments in south-western Australia. The 0 + recruits, which first appeared in samples in February, remained in the estuary during the following months and by November had reached a size suitable for exploitation. At this time they were approaching sexual maturity and were starting to move from the shallows to the deeper waters of the estuary where they remained for their second year of life. In contrast to Australian Penaeus species, M. dalli mates during the intermoult period when the shell is hard rather than immediately after moulting.


1965 ◽  
Vol 22 (6) ◽  
pp. 1477-1489 ◽  
Author(s):  
H. T. Bilton ◽  
W. E. Ricker

Among 159 central British Columbia pink salmon that had been marked by removal of two fins as fry and had been recovered in commercial fisheries after one winter in the sea, the scales of about one-third showed a supplementary or "false" check near the centre of the scale, in addition to the single clear-cut annulus. This evidence from fish of known age confirms the prevailing opinion that such extra checks do not represent annuli, hence that the fish bearing them are in their second year of life rather than their third. Unmarked pink salmon from the same area, and some from southern British Columbia, had a generally similar incidence of supplementary checks. In both marked and unmarked fish the supplementary checks varied in distinctness from faint to quite clear. In a sample of scales of 14 double-fin marked chum salmon which were known to be in their 4th year, all fish had the expected 3 annuli, and 12 fish had a supplementary check inside the first annulus.


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