Links between habitat degradation, and social group size, ranging, fecundity, and parasite prevalence in the Tana River mangabey (Cercocebus galeritus)

2009 ◽  
Vol 140 (3) ◽  
pp. 562-571 ◽  
Author(s):  
David N.M. Mbora ◽  
Julie Wieczkowski ◽  
Elephas Munene
Keyword(s):  
Group Size ◽  
Social Group ◽  
Habitat Degradation ◽  
Parasite Prevalence ◽  
Tana River ◽  
Cercocebus Galeritus

Habitat patch size and mating system as determinants of social group size in coral-dwelling fishes

Coral Reefs ◽  
2006 ◽  
Vol 26 (1) ◽  
pp. 165-174 ◽  
Author(s):  
V. J. Thompson ◽  
P. L. Munday ◽  
G. P. Jones
Keyword(s):  
Mating System ◽  
Group Size ◽  
Social Group ◽  
Patch Size ◽  
Habitat Patch ◽  
Habitat Patch Size

Effect of social group size on aggressive behaviour between unacquainted domestic pigs

2001 ◽  
Vol 74 (3) ◽  
pp. 203-215 ◽  
Author(s):  
Simon P Turner ◽  
Graham W Horgan ◽  
Sandra A Edwards
Keyword(s):  
Group Size ◽  
Social Group ◽  
Aggressive Behaviour ◽  
Domestic Pigs

Effects of social group size on information transfer and task allocation

1996 ◽  
Vol 10 (2) ◽  
pp. 127-165 ◽  
Author(s):  
Stephen W. Pacala ◽  
Deborah M. Gordon ◽  
H. C. J. Godfray
Keyword(s):  
Group Size ◽  
Task Allocation ◽  
Social Group ◽  
Information Transfer ◽  
And Task

scholarly journals Social Group Size and Shelter Availability Influence Individual Metabolic Traits in a Social Fish

2021 ◽  
Author(s):  
Emmanuelle Chrétien ◽  
Daniel Boisclair ◽  
Steven J Cooke ◽  
Shaun S Killen
Keyword(s):  
Metabolic Rate ◽  
Group Size ◽  
Social Group ◽  
Physiological Traits ◽  
Metabolic Rates ◽  
Night Time ◽  
The Social ◽  
Before And After ◽  
Social Treatment ◽  
Shelter Availability

Abstract Group living is widespread among animal species and yields both costs and benefits. Presence of conspecifics can restrict or enhance the expression of individual behaviour, and the recent social environment is thought to affect behavioural responses in later contexts, even when individuals are alone. However, little is known about how social group size influences the expression of individual physiological traits, including metabolic rates. There is some evidence that shoaling can reduce fish metabolic rates but this variable may be affected by habitat conditions such as shelter availability via density-dependent processes. We investigated how social group size and shelter availability influence Eurasian minnow Phoxinus phoxinus metabolic rates estimated by respirometry. Respirometry trials were conducted on fish in isolation before and after they were housed for three weeks in a social treatment consisting in a specific group size (n = 4 or 8) and shelter availability (presence or absence of plant shelter in the experimental tank). Plant shelter was placed over respirometers for half of the duration of the respirometry trials, allowing estimation of minimum day-time and night-time metabolic rates in both conditions (in the presence or absence of plant shelter). Standard metabolic rate (SMR), maximum metabolic rate (MMR), and aerobic scope (AS) were also estimated over the entire trial. Minimum day-time and night-time metabolic rates estimated while in presence of plant shelter were lower than when estimated in absence of plant shelter, both before and after individuals were housed in their social treatment. After the social treatment, SMR were higher for fish that were held in groups of four as compared to that of fish held in groups of eight while MMR showed no difference. Plant shelter availability during the social treatments did not influence SMR or MMR. Our results suggest that social group size may directly influence energy demands of individuals, highlighting the importance of understanding the role of group size on variations in physiological traits associated with energy expenditure.

Effect of social group size and initial live weight on feeder space requirement of growing pigs given food ad libitum

2002 ◽  
Vol 75 (1) ◽  
pp. 75-83 ◽  
Author(s):  
S.P. Turner ◽  
M. Dahlgren ◽  
D.S. Arey ◽  
S.A. Edwards
Keyword(s):  
Growth Rate ◽  
Group Size ◽  
Social Group ◽  
Feeding Behaviour ◽  
Interactive Effect ◽  
Live Weight ◽  
Growing Pigs ◽  
Space Requirement ◽  
Ad Libitum ◽  
Feeder Space

AbstractFeeder space allowance should be sufficient to ensure adequate access to food for all group members, irrespective of competitive ability. However, the influence of social group size on minimum feeder space requirement of pigs given food ad libitum is poorly understood. Performance, aggression and feeding behaviour were assessed over a 6-week period from 29·3 (s.e. 0·19) kg live weight, using four replicates of a 2 ✕ 2 factorial design with two group sizes (20 v. 80) (small and large) and two feeder space allowances (32·5 v. 42·5 mm per pig) (low and high). Food intake was significantly lower in the low feeder space allowance treatments (1·44 v. 1·56 (s.e.d. 0·050) kg per pig per day, P < 0·05) and group mean growth rate was reduced in the later phase between 41 and 56 kg live weight. There was no main effect of group size or interactive effect between group size and feeder space allowance on performance. Mean skin lesion score and the frequency of aggression given or received at the feeders was unaffected by treatment. Heavy weight pigs showed similar feeding behaviour in each treatment, but light pigs visited the feeder more frequently in groups of 20 (23·1 v. 16·0 (s.e.d. 2·04) visits per pig per day, P < 0·05) and spent the greatest time feeding when at a low feeder space allowance (5461 v. 4397 (s.e.d. 288·8) s per pig per day, P < 0·05). To avoid a depression in growth rate, pigs >40 kg should be allocated a minimum feeder space allowance of 42·5 mm per pig. There was little indication of a need to specify differential feeder space allowances according to group size.

Mexican Jay social group size varies with habitat in northeastern Mexico

2006 ◽  
Vol 77 (2) ◽  
pp. 104-110 ◽  
Author(s):  
Nirmal K. Bhagabati ◽  
Eric G. Horvath
Keyword(s):  
Group Size ◽  
Social Group ◽  
Northeastern Mexico
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