Foraging site use and interspecific competition between bluegills and golden shiners

1986 ◽  
Vol 17 (3) ◽  
pp. 227-233 ◽  
Author(s):  
Cynthia A. Paszkowski
Keyword(s):  
Interspecific Competition ◽  
Site Use ◽  
Foraging Site ◽  
Golden Shiners

Oceanographic drivers of near-colony seabird foraging site use in tropical marine systems

2018 ◽  
Vol 589 ◽  
pp. 209-225 ◽  
Author(s):  
F McDuie ◽  
SJ Weeks ◽  
BC Congdon
Keyword(s):  
Marine Systems ◽  
Site Use ◽  
Foraging Site

Efficient Use of Food Patches At Different Distances From a Breeding Colony in Black-Billed Gulls

Behaviour ◽  
1982 ◽  
Vol 79 (1) ◽  
pp. 28-38 ◽  
Author(s):  
Roger M. Evans
Keyword(s):  
Optimal Foraging ◽  
Probability Model ◽  
Optimal Foraging Theory ◽  
Main Study ◽  
Breeding Colony ◽  
Daily Pattern ◽  
Direct Observations ◽  
Site Use ◽  
Foraging Site ◽  
Foraging Distances

AbstractA probability model is developed and tested to examine the hypothesis, derived from optimal foraging theory, that black-billed gulls utilize foraging sites efficiently by foraging at sites close to the colony when these are available. One hundred and nine inland foraging sites were located. Only 17 (20 % ) of 86 sites measured were used for more than 3 consecutive days. Use of 46 foraging sites by birds from the main study colony was documented by direct observations of foragers commuting between the colony and foraging sites. For these sites, the distance from the colony ranged up to 11.9 km (mean = 4.7 km). The daily pattern of foraging site use in relation to distance from the colony correlated with the pattern predicted by the optimality model, but differences in detail were evident. Departures from predicted foraging distances appeared to relate more to errors in the main assumptions of the model as applied to a field context, rather than to any obvious failure on the part of the gulls to utilize food sites efficiently.

Interspecific competition between Rhinocyllus conicus and Urophora soistitialis L on nodding thistle in Canterbury

2005 ◽  
Vol 58 ◽  
pp. 140-147 ◽  
Author(s):  
M.R. McNeill ◽  
C.J. Fletcher
Keyword(s):  
Interspecific Competition ◽  
Insect Species ◽  
Carduus Nutans ◽  
Rhinocyllus Conicus ◽  
Microctonus Aethiopoides

Nodding thistle receptacle weevil Rhinocyllus conicus and gallfly Urophora solstitialis attack the capitula of nodding thistle Carduus nutans L Between 31 October and 15 December 2003 the phenology of both R conicus and U solstitialis was studied at a dryland site in Canterbury Adult R conicus were more numerous than U solstitialis on capitula throughout the experiment Larvae of R conicus were first found on 11 November (15 of capitula infested) and peaked on 2 December with 53 of capitula infested Only 3 of capitula were infested by U solstitialis Adult R conicus or U solstitialis emerged from 79 of the selected primary and secondary capitula The majority of infested capitula (81) contained only R conicus 2 contained only U solstitialis while 17 contained both insect species Parasitism of R conicus by the braconid parasitoid Microctonus aethiopoides was low and occurred when most weevil eggs had been laid

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