caa a22 4500 465782329 CHVBK 20180323111958.0 cr unu---uuuuu 170327e19900201xx s 000 0 eng 10.1007/BF00171583 doi (NATIONALLICENCE)springer-10.1007/BF00171583 Clifton Kenneth Department of Biological Sciences, University of California, 93106, Santa Barbara, CA, USA aut The costs and benefits of territory sharing for the Caribbean coral reef fish, Scarus iserti [Elektronische Daten] [Kenneth Clifton] Summary: Along the Caribbean coast of Panama, groups of unrelated female striped parrotfish, Scarus iserti, co-defend a common feeding territory. Field manipulations of group size and composition were performed to examine the benefits and costs accrued by dominant fish within these shared territories. Dominant fish benefit from the presence of relatively large subordinates because they share in the defense of the territory. Removals of these fish caused increases in defense time and decreases in feeding time for dominant group members. Dominants benefit from the presence of small subordinates because they increase the foraging efficiency of dominants. Removals of smaller subordinates caused reductions in the feeding time of dominant fish, although no changes in defense time occurred. Concurrently, dominant fish reduce costs of resource depletion by displacing subordinate group members from good food patches. Dominance interactions within a group reduce the amount of time subordinates spend feeding (subordinate individuals fed at higher rates following the removal of a dominant) and limit a subordinate's access to high quality resources. This combination of benefits and reduced costs ultimately contributes to the economic defensibility of a striped parrotfish territory and has led to the evolution of group territorial behavior in the absence of kin selection and cooperative parental care. Springer-Verlag, 1990 Behavioral Ecology and Sociobiology Springer-Verlag 26/2(1990-02-01), 139-147 0340-5443 26:2<139 1990 26 265 https://doi.org/10.1007/BF00171583 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/BF00171583 text/html Onlinezugriff via DOI NATIONALLICENCE 100 1- Clifton Kenneth Department of Biological Sciences, University of California, 93106, Santa Barbara, CA, USA aut NATIONALLICENCE 773 0- Behavioral Ecology and Sociobiology Springer-Verlag 26/2(1990-02-01), 139-147 0340-5443 26:2<139 1990 26 265 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer