Effects of predation hazard on foraging "constraints": Patch-use strategies in grey squirrels [Sciurus cardinensis]
We examined the effects of predation hazard on patch-residence time and meal size (usually taken as foraging decisions), as well as on travel time, handling time, and the gain function (usually taken as constraints on foraging decisions). Each day we presented grey squirrels (Sciurus carolinensis) w...
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| Veröffentlicht in: | Oikos 1988-07, Vol.53 (1), p.93-97 |
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| container_title | Oikos |
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| creator | Newman, J.A Recer, G.M Zwicker, S.M Caraco, T. (New York Univ., Albany (USA). Behavioral Ecology Group) |
| description | We examined the effects of predation hazard on patch-residence time and meal size (usually taken as foraging decisions), as well as on travel time, handling time, and the gain function (usually taken as constraints on foraging decisions). Each day we presented grey squirrels (Sciurus carolinensis) with eight artificial patches of sunflower seeds of the same initial density (either 25, 50, 100, or 200) at one distance to cover (either 5 or 15 m). We found that the squirrels ate the same quantity of seeds farther from cover, but that they ate them significantly faster. Squirrels also travelled significantly faster between patches, and handled seeds significantly faster within patches when farther from cover. The change in the handling times caused the squirrels' gain functions to be higher farther from cover. We found a predictable pattern of variation in the values of the presumed "constraints". |
| doi_str_mv | 10.2307/3565668 |
| format | Article |
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(New York Univ., Albany (USA). Behavioral Ecology Group)</creator><creatorcontrib>Newman, J.A ; Recer, G.M ; Zwicker, S.M ; Caraco, T. (New York Univ., Albany (USA). Behavioral Ecology Group)</creatorcontrib><description>We examined the effects of predation hazard on patch-residence time and meal size (usually taken as foraging decisions), as well as on travel time, handling time, and the gain function (usually taken as constraints on foraging decisions). Each day we presented grey squirrels (Sciurus carolinensis) with eight artificial patches of sunflower seeds of the same initial density (either 25, 50, 100, or 200) at one distance to cover (either 5 or 15 m). We found that the squirrels ate the same quantity of seeds farther from cover, but that they ate them significantly faster. Squirrels also travelled significantly faster between patches, and handled seeds significantly faster within patches when farther from cover. The change in the handling times caused the squirrels' gain functions to be higher farther from cover. We found a predictable pattern of variation in the values of the presumed "constraints".</description><identifier>ISSN: 0030-1299</identifier><identifier>EISSN: 1600-0706</identifier><identifier>DOI: 10.2307/3565668</identifier><identifier>CODEN: OIKSAA</identifier><language>eng</language><publisher>Oxford: Munksgaard International Booksellers and Publishers</publisher><subject>Animal ethology ; Animal feeding behavior ; Animals ; ARDILLA ; Biological and medical sciences ; BUSQUEDA DE ALIMENTO ; Confidence interval ; ECUREUIL ; ESTADOS UNIDOS DE AMERICA ; ETATS-UNIS ; FORAGING ; Fundamental and applied biological sciences. Psychology ; Mammalia ; Marginal value ; Mathematical functions ; Predation ; Predators ; Psychology. Psychoanalysis. Psychiatry ; RECHERCHE DE NOURRITURE ; Sciurus carolinensis ; SQUIRRELS ; Travel time ; USA ; Vertebrata</subject><ispartof>Oikos, 1988-07, Vol.53 (1), p.93-97</ispartof><rights>Copyright 1988 Oikos</rights><rights>1989 INIST-CNRS</rights><lds50>peer_reviewed</lds50><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-c360t-ff1d017694fa57c3c166d1f7c63ea455b447373e41a55cff50196542bbc51f6c3</citedby></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><linktopdf>$$Uhttps://www.jstor.org/stable/pdf/3565668$$EPDF$$P50$$Gjstor$$H</linktopdf><linktohtml>$$Uhttps://www.jstor.org/stable/3565668$$EHTML$$P50$$Gjstor$$H</linktohtml><link.rule.ids>314,778,782,801,27907,27908,58000,58233</link.rule.ids><backlink>$$Uhttp://pascal-francis.inist.fr/vibad/index.php?action=getRecordDetail&idt=7205049$$DView record in Pascal Francis$$Hfree_for_read</backlink></links><search><creatorcontrib>Newman, J.A</creatorcontrib><creatorcontrib>Recer, G.M</creatorcontrib><creatorcontrib>Zwicker, S.M</creatorcontrib><creatorcontrib>Caraco, T. (New York Univ., Albany (USA). Behavioral Ecology Group)</creatorcontrib><title>Effects of predation hazard on foraging "constraints": Patch-use strategies in grey squirrels [Sciurus cardinensis]</title><title>Oikos</title><description>We examined the effects of predation hazard on patch-residence time and meal size (usually taken as foraging decisions), as well as on travel time, handling time, and the gain function (usually taken as constraints on foraging decisions). Each day we presented grey squirrels (Sciurus carolinensis) with eight artificial patches of sunflower seeds of the same initial density (either 25, 50, 100, or 200) at one distance to cover (either 5 or 15 m). We found that the squirrels ate the same quantity of seeds farther from cover, but that they ate them significantly faster. Squirrels also travelled significantly faster between patches, and handled seeds significantly faster within patches when farther from cover. The change in the handling times caused the squirrels' gain functions to be higher farther from cover. We found a predictable pattern of variation in the values of the presumed "constraints".</description><subject>Animal ethology</subject><subject>Animal feeding behavior</subject><subject>Animals</subject><subject>ARDILLA</subject><subject>Biological and medical sciences</subject><subject>BUSQUEDA DE ALIMENTO</subject><subject>Confidence interval</subject><subject>ECUREUIL</subject><subject>ESTADOS UNIDOS DE AMERICA</subject><subject>ETATS-UNIS</subject><subject>FORAGING</subject><subject>Fundamental and applied biological sciences. Psychology</subject><subject>Mammalia</subject><subject>Marginal value</subject><subject>Mathematical functions</subject><subject>Predation</subject><subject>Predators</subject><subject>Psychology. Psychoanalysis. Psychiatry</subject><subject>RECHERCHE DE NOURRITURE</subject><subject>Sciurus carolinensis</subject><subject>SQUIRRELS</subject><subject>Travel time</subject><subject>USA</subject><subject>Vertebrata</subject><issn>0030-1299</issn><issn>1600-0706</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>1988</creationdate><recordtype>article</recordtype><recordid>eNp90E1LHEEQgOFGEnBjgvecGhFzmlg9_bWTm6j5QCGBJKcgQ21v99gydq9dPQf99RnZxdxyqqJ4eA_F2KGAj60Eeyq10cYs99hCGIAGLJhXbAEgoRFt1-2zN0R3AGCtVQtGlyF4V4nnwDfFr7HGnPgtPmFZ83kLueAQ08CPXE5UC8ZU6egT_4HV3TYTef58rH6InnhMfCj-kdPDFEvxI_E_P12cykTczb2YfKJIN2_Z64Aj-Xe7ecB-f778df61uf7-5dv52XXjpIHahCDWIKzpVEBtnXTCmLUI1hnpUWm9UspKK70SqLULQYPojFbtauW0CMbJA3ay7W5Kfpg81f4-kvPjiMnniXqhoe2WWs_wwxa6komKD_2mxHssj72A_vmp_e6pszzeJZEcjqFgcpFeuG1Bg-r-sTuqufyn9n7LAuYehzKXLq6Wy1YBGPkXQX6KOw</recordid><startdate>19880701</startdate><enddate>19880701</enddate><creator>Newman, J.A</creator><creator>Recer, G.M</creator><creator>Zwicker, S.M</creator><creator>Caraco, T. (New York Univ., Albany (USA). Behavioral Ecology Group)</creator><general>Munksgaard International Booksellers and Publishers</general><general>Blackwell</general><scope>FBQ</scope><scope>IQODW</scope><scope>AAYXX</scope><scope>CITATION</scope><scope>7QG</scope><scope>7SN</scope><scope>C1K</scope></search><sort><creationdate>19880701</creationdate><title>Effects of predation hazard on foraging "constraints": Patch-use strategies in grey squirrels [Sciurus cardinensis]</title><author>Newman, J.A ; Recer, G.M ; Zwicker, S.M ; Caraco, T. (New York Univ., Albany (USA). Behavioral Ecology Group)</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c360t-ff1d017694fa57c3c166d1f7c63ea455b447373e41a55cff50196542bbc51f6c3</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>1988</creationdate><topic>Animal ethology</topic><topic>Animal feeding behavior</topic><topic>Animals</topic><topic>ARDILLA</topic><topic>Biological and medical sciences</topic><topic>BUSQUEDA DE ALIMENTO</topic><topic>Confidence interval</topic><topic>ECUREUIL</topic><topic>ESTADOS UNIDOS DE AMERICA</topic><topic>ETATS-UNIS</topic><topic>FORAGING</topic><topic>Fundamental and applied biological sciences. Psychology</topic><topic>Mammalia</topic><topic>Marginal value</topic><topic>Mathematical functions</topic><topic>Predation</topic><topic>Predators</topic><topic>Psychology. Psychoanalysis. Psychiatry</topic><topic>RECHERCHE DE NOURRITURE</topic><topic>Sciurus carolinensis</topic><topic>SQUIRRELS</topic><topic>Travel time</topic><topic>USA</topic><topic>Vertebrata</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Newman, J.A</creatorcontrib><creatorcontrib>Recer, G.M</creatorcontrib><creatorcontrib>Zwicker, S.M</creatorcontrib><creatorcontrib>Caraco, T. (New York Univ., Albany (USA). Behavioral Ecology Group)</creatorcontrib><collection>AGRIS</collection><collection>Pascal-Francis</collection><collection>CrossRef</collection><collection>Animal Behavior Abstracts</collection><collection>Ecology Abstracts</collection><collection>Environmental Sciences and Pollution Management</collection><jtitle>Oikos</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Newman, J.A</au><au>Recer, G.M</au><au>Zwicker, S.M</au><au>Caraco, T. (New York Univ., Albany (USA). Behavioral Ecology Group)</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Effects of predation hazard on foraging "constraints": Patch-use strategies in grey squirrels [Sciurus cardinensis]</atitle><jtitle>Oikos</jtitle><date>1988-07-01</date><risdate>1988</risdate><volume>53</volume><issue>1</issue><spage>93</spage><epage>97</epage><pages>93-97</pages><issn>0030-1299</issn><eissn>1600-0706</eissn><coden>OIKSAA</coden><abstract>We examined the effects of predation hazard on patch-residence time and meal size (usually taken as foraging decisions), as well as on travel time, handling time, and the gain function (usually taken as constraints on foraging decisions). Each day we presented grey squirrels (Sciurus carolinensis) with eight artificial patches of sunflower seeds of the same initial density (either 25, 50, 100, or 200) at one distance to cover (either 5 or 15 m). We found that the squirrels ate the same quantity of seeds farther from cover, but that they ate them significantly faster. Squirrels also travelled significantly faster between patches, and handled seeds significantly faster within patches when farther from cover. The change in the handling times caused the squirrels' gain functions to be higher farther from cover. We found a predictable pattern of variation in the values of the presumed "constraints".</abstract><cop>Oxford</cop><pub>Munksgaard International Booksellers and Publishers</pub><doi>10.2307/3565668</doi><tpages>5</tpages></addata></record> |
| fulltext | fulltext |
| identifier | ISSN: 0030-1299 |
| ispartof | Oikos, 1988-07, Vol.53 (1), p.93-97 |
| issn | 0030-1299 1600-0706 |
| language | eng |
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| source | Jstor Complete Legacy |
| subjects | Animal ethology Animal feeding behavior Animals ARDILLA Biological and medical sciences BUSQUEDA DE ALIMENTO Confidence interval ECUREUIL ESTADOS UNIDOS DE AMERICA ETATS-UNIS FORAGING Fundamental and applied biological sciences. Psychology Mammalia Marginal value Mathematical functions Predation Predators Psychology. Psychoanalysis. Psychiatry RECHERCHE DE NOURRITURE Sciurus carolinensis SQUIRRELS Travel time USA Vertebrata |
| title | Effects of predation hazard on foraging "constraints": Patch-use strategies in grey squirrels [Sciurus cardinensis] |
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