Extreme offspring ornamentation in American coots is favored by selection within families, not benefits to conspecific brood parasites
Offspring ornamentation typically occurs in taxa with parental care, suggesting that selection arising from social interactions between parents and offspring may underlie signal evolution. American coot babies are among the most ornamented offspring found in nature, sporting vividly orange-red natal...
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Veröffentlicht in: | Proceedings of the National Academy of Sciences - PNAS 2020-01, Vol.117 (4), p.2056-2064 |
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description | Offspring ornamentation typically occurs in taxa with parental care, suggesting that selection arising from social interactions between parents and offspring may underlie signal evolution. American coot babies are among the most ornamented offspring found in nature, sporting vividly orange-red natal plumage, a bright red beak, and other red parts around the face and pate. Previous plumage manipulation experiments showed that ornamented plumage is favored by strong parental choice for chicks with more extreme ornamentation but left unresolved the question as to why parents show the preference. Here we explore natural patterns of variation in coot chick plumage color, both within and between families, to understand the context of parental preference and to determine whose fitness interests are served by the ornamentation. Conspecific brood parasitism is common in coots and brood parasitic chicks could manipulate hosts by tapping into parental choice for ornamented chicks. However, counter to expectation, parasitic chicks were duller (less red) than nonparasitic chicks. This pattern is explained by color variation within families: Chick coloration increases with position in the egg-laying order, but parasitic eggs are usually the first eggs a female lays. Maternal effects influence chick coloration, but coot females do not use this mechanism to benefit the chicks they lay as parasites. However, within families, chick coloration predicts whether chicks become “favorites” when parents begin control over food distribution, implicating a role for the chick ornamentation in the parental life-history strategy, perhaps as a reliable signal of a chick’s size or age. |
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American coot babies are among the most ornamented offspring found in nature, sporting vividly orange-red natal plumage, a bright red beak, and other red parts around the face and pate. Previous plumage manipulation experiments showed that ornamented plumage is favored by strong parental choice for chicks with more extreme ornamentation but left unresolved the question as to why parents show the preference. Here we explore natural patterns of variation in coot chick plumage color, both within and between families, to understand the context of parental preference and to determine whose fitness interests are served by the ornamentation. Conspecific brood parasitism is common in coots and brood parasitic chicks could manipulate hosts by tapping into parental choice for ornamented chicks. However, counter to expectation, parasitic chicks were duller (less red) than nonparasitic chicks. This pattern is explained by color variation within families: Chick coloration increases with position in the egg-laying order, but parasitic eggs are usually the first eggs a female lays. Maternal effects influence chick coloration, but coot females do not use this mechanism to benefit the chicks they lay as parasites. However, within families, chick coloration predicts whether chicks become “favorites” when parents begin control over food distribution, implicating a role for the chick ornamentation in the parental life-history strategy, perhaps as a reliable signal of a chick’s size or age.</description><identifier>ISSN: 0027-8424</identifier><identifier>EISSN: 1091-6490</identifier><identifier>DOI: 10.1073/pnas.1913615117</identifier><identifier>PMID: 31888995</identifier><language>eng</language><publisher>United States: National Academy of Sciences</publisher><subject>Animals ; Babies ; Biological Evolution ; Biological Sciences ; Birds - classification ; Birds - genetics ; Birds - physiology ; Breeding ; Brood parasitism ; Chicks ; Color ; Coloration ; Egg laying ; Eggs ; Female ; Females ; Fulica americana ; Juveniles ; Life history ; Male ; Maternal effects ; Nesting Behavior ; Offspring ; Ovum - chemistry ; Ovum - physiology ; Parasites ; Parasitism ; Pedigree ; Plumage ; Selection, Genetic ; Social factors ; Social interactions</subject><ispartof>Proceedings of the National Academy of Sciences - PNAS, 2020-01, Vol.117 (4), p.2056-2064</ispartof><rights>Copyright National Academy of Sciences Jan 28, 2020</rights><rights>2020</rights><lds50>peer_reviewed</lds50><oa>free_for_read</oa><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-c443t-3914b4fa6c7c776a51ba34567eebc4bd906424cda6efe376ebce656e863f89123</citedby><cites>FETCH-LOGICAL-c443t-3914b4fa6c7c776a51ba34567eebc4bd906424cda6efe376ebce656e863f89123</cites><orcidid>0000-0001-8733-9944 ; 0000-0002-0478-6309</orcidid></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><linktopdf>$$Uhttps://www.jstor.org/stable/pdf/26897803$$EPDF$$P50$$Gjstor$$H</linktopdf><linktohtml>$$Uhttps://www.jstor.org/stable/26897803$$EHTML$$P50$$Gjstor$$H</linktohtml><link.rule.ids>230,314,727,780,784,803,885,27922,27923,53789,53791,58015,58248</link.rule.ids><backlink>$$Uhttps://www.ncbi.nlm.nih.gov/pubmed/31888995$$D View this record in MEDLINE/PubMed$$Hfree_for_read</backlink></links><search><creatorcontrib>Lyon, Bruce E.</creatorcontrib><creatorcontrib>Shizuka, Daizaburo</creatorcontrib><title>Extreme offspring ornamentation in American coots is favored by selection within families, not benefits to conspecific brood parasites</title><title>Proceedings of the National Academy of Sciences - PNAS</title><addtitle>Proc Natl Acad Sci U S A</addtitle><description>Offspring ornamentation typically occurs in taxa with parental care, suggesting that selection arising from social interactions between parents and offspring may underlie signal evolution. American coot babies are among the most ornamented offspring found in nature, sporting vividly orange-red natal plumage, a bright red beak, and other red parts around the face and pate. Previous plumage manipulation experiments showed that ornamented plumage is favored by strong parental choice for chicks with more extreme ornamentation but left unresolved the question as to why parents show the preference. Here we explore natural patterns of variation in coot chick plumage color, both within and between families, to understand the context of parental preference and to determine whose fitness interests are served by the ornamentation. Conspecific brood parasitism is common in coots and brood parasitic chicks could manipulate hosts by tapping into parental choice for ornamented chicks. However, counter to expectation, parasitic chicks were duller (less red) than nonparasitic chicks. This pattern is explained by color variation within families: Chick coloration increases with position in the egg-laying order, but parasitic eggs are usually the first eggs a female lays. Maternal effects influence chick coloration, but coot females do not use this mechanism to benefit the chicks they lay as parasites. However, within families, chick coloration predicts whether chicks become “favorites” when parents begin control over food distribution, implicating a role for the chick ornamentation in the parental life-history strategy, perhaps as a reliable signal of a chick’s size or age.</description><subject>Animals</subject><subject>Babies</subject><subject>Biological Evolution</subject><subject>Biological Sciences</subject><subject>Birds - classification</subject><subject>Birds - genetics</subject><subject>Birds - physiology</subject><subject>Breeding</subject><subject>Brood parasitism</subject><subject>Chicks</subject><subject>Color</subject><subject>Coloration</subject><subject>Egg laying</subject><subject>Eggs</subject><subject>Female</subject><subject>Females</subject><subject>Fulica americana</subject><subject>Juveniles</subject><subject>Life history</subject><subject>Male</subject><subject>Maternal effects</subject><subject>Nesting Behavior</subject><subject>Offspring</subject><subject>Ovum - chemistry</subject><subject>Ovum - physiology</subject><subject>Parasites</subject><subject>Parasitism</subject><subject>Pedigree</subject><subject>Plumage</subject><subject>Selection, Genetic</subject><subject>Social factors</subject><subject>Social interactions</subject><issn>0027-8424</issn><issn>1091-6490</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2020</creationdate><recordtype>article</recordtype><sourceid>EIF</sourceid><recordid>eNpdkcFvFCEUxonR2HX17ElD4sWD08LAwHAxaZqqTZp40TNhmEfLZgZGYKv9B_y7Zbt1Wz29hPd7H-97H0KvKTmmRLKTJZh8TBVlgnaUyidoRYmijeCKPEUrQlrZ9LzlR-hFzhtCiOp68hwdMdr3vVLdCv0-_1USzICjc3lJPlzhmIKZIRRTfAzYB3w6Q_LWBGxjLBn7jJ25iQlGPNziDBPYO_KnL9eVdmb2k4f8AYdY8AABnK9TJdbxkBew3nmLhxTjiBeTTPYF8kv0zJkpw6v7ukbfP51_O_vSXH79fHF2etlYzllpmKJ84M4IK62UwnR0MIx3QgIMlg-jIqK6taMR4IBJUV9BdAJ6wVyvaMvW6ONed9kOM4y22kxm0tX4bNKtjsbrfzvBX-ureKNFvRahXRV4fy-Q4o8t5KJnny1MkwkQt1m3jFFBOak_rtG7_9BN3NbbTjuqirWslkqd7CmbYs4J3GEZSvQuY73LWD9kXCfePvZw4P-GWoE3e2CTS0yHfit6JXvC2B9ip7Bz</recordid><startdate>20200128</startdate><enddate>20200128</enddate><creator>Lyon, Bruce E.</creator><creator>Shizuka, Daizaburo</creator><general>National Academy of Sciences</general><scope>CGR</scope><scope>CUY</scope><scope>CVF</scope><scope>ECM</scope><scope>EIF</scope><scope>NPM</scope><scope>AAYXX</scope><scope>CITATION</scope><scope>7QG</scope><scope>7QL</scope><scope>7QP</scope><scope>7QR</scope><scope>7SN</scope><scope>7SS</scope><scope>7T5</scope><scope>7TK</scope><scope>7TM</scope><scope>7TO</scope><scope>7U9</scope><scope>8FD</scope><scope>C1K</scope><scope>FR3</scope><scope>H94</scope><scope>M7N</scope><scope>P64</scope><scope>RC3</scope><scope>7X8</scope><scope>5PM</scope><orcidid>https://orcid.org/0000-0001-8733-9944</orcidid><orcidid>https://orcid.org/0000-0002-0478-6309</orcidid></search><sort><creationdate>20200128</creationdate><title>Extreme offspring ornamentation in American coots is favored by selection within families, not benefits to conspecific brood parasites</title><author>Lyon, Bruce E. ; Shizuka, Daizaburo</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c443t-3914b4fa6c7c776a51ba34567eebc4bd906424cda6efe376ebce656e863f89123</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2020</creationdate><topic>Animals</topic><topic>Babies</topic><topic>Biological Evolution</topic><topic>Biological Sciences</topic><topic>Birds - classification</topic><topic>Birds - genetics</topic><topic>Birds - physiology</topic><topic>Breeding</topic><topic>Brood parasitism</topic><topic>Chicks</topic><topic>Color</topic><topic>Coloration</topic><topic>Egg laying</topic><topic>Eggs</topic><topic>Female</topic><topic>Females</topic><topic>Fulica americana</topic><topic>Juveniles</topic><topic>Life history</topic><topic>Male</topic><topic>Maternal effects</topic><topic>Nesting Behavior</topic><topic>Offspring</topic><topic>Ovum - chemistry</topic><topic>Ovum - physiology</topic><topic>Parasites</topic><topic>Parasitism</topic><topic>Pedigree</topic><topic>Plumage</topic><topic>Selection, Genetic</topic><topic>Social factors</topic><topic>Social interactions</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Lyon, Bruce E.</creatorcontrib><creatorcontrib>Shizuka, Daizaburo</creatorcontrib><collection>Medline</collection><collection>MEDLINE</collection><collection>MEDLINE (Ovid)</collection><collection>MEDLINE</collection><collection>MEDLINE</collection><collection>PubMed</collection><collection>CrossRef</collection><collection>Animal Behavior Abstracts</collection><collection>Bacteriology Abstracts (Microbiology B)</collection><collection>Calcium & Calcified Tissue Abstracts</collection><collection>Chemoreception Abstracts</collection><collection>Ecology Abstracts</collection><collection>Entomology Abstracts (Full archive)</collection><collection>Immunology Abstracts</collection><collection>Neurosciences Abstracts</collection><collection>Nucleic Acids Abstracts</collection><collection>Oncogenes and Growth Factors Abstracts</collection><collection>Virology and AIDS Abstracts</collection><collection>Technology Research Database</collection><collection>Environmental Sciences and Pollution Management</collection><collection>Engineering Research Database</collection><collection>AIDS and Cancer Research Abstracts</collection><collection>Algology Mycology and Protozoology Abstracts (Microbiology C)</collection><collection>Biotechnology and BioEngineering Abstracts</collection><collection>Genetics Abstracts</collection><collection>MEDLINE - Academic</collection><collection>PubMed Central (Full Participant titles)</collection><jtitle>Proceedings of the National Academy of Sciences - PNAS</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Lyon, Bruce E.</au><au>Shizuka, Daizaburo</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Extreme offspring ornamentation in American coots is favored by selection within families, not benefits to conspecific brood parasites</atitle><jtitle>Proceedings of the National Academy of Sciences - PNAS</jtitle><addtitle>Proc Natl Acad Sci U S A</addtitle><date>2020-01-28</date><risdate>2020</risdate><volume>117</volume><issue>4</issue><spage>2056</spage><epage>2064</epage><pages>2056-2064</pages><issn>0027-8424</issn><eissn>1091-6490</eissn><abstract>Offspring ornamentation typically occurs in taxa with parental care, suggesting that selection arising from social interactions between parents and offspring may underlie signal evolution. American coot babies are among the most ornamented offspring found in nature, sporting vividly orange-red natal plumage, a bright red beak, and other red parts around the face and pate. Previous plumage manipulation experiments showed that ornamented plumage is favored by strong parental choice for chicks with more extreme ornamentation but left unresolved the question as to why parents show the preference. Here we explore natural patterns of variation in coot chick plumage color, both within and between families, to understand the context of parental preference and to determine whose fitness interests are served by the ornamentation. Conspecific brood parasitism is common in coots and brood parasitic chicks could manipulate hosts by tapping into parental choice for ornamented chicks. However, counter to expectation, parasitic chicks were duller (less red) than nonparasitic chicks. This pattern is explained by color variation within families: Chick coloration increases with position in the egg-laying order, but parasitic eggs are usually the first eggs a female lays. Maternal effects influence chick coloration, but coot females do not use this mechanism to benefit the chicks they lay as parasites. However, within families, chick coloration predicts whether chicks become “favorites” when parents begin control over food distribution, implicating a role for the chick ornamentation in the parental life-history strategy, perhaps as a reliable signal of a chick’s size or age.</abstract><cop>United States</cop><pub>National Academy of Sciences</pub><pmid>31888995</pmid><doi>10.1073/pnas.1913615117</doi><tpages>9</tpages><orcidid>https://orcid.org/0000-0001-8733-9944</orcidid><orcidid>https://orcid.org/0000-0002-0478-6309</orcidid><oa>free_for_read</oa></addata></record> |
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subjects | Animals Babies Biological Evolution Biological Sciences Birds - classification Birds - genetics Birds - physiology Breeding Brood parasitism Chicks Color Coloration Egg laying Eggs Female Females Fulica americana Juveniles Life history Male Maternal effects Nesting Behavior Offspring Ovum - chemistry Ovum - physiology Parasites Parasitism Pedigree Plumage Selection, Genetic Social factors Social interactions |
title | Extreme offspring ornamentation in American coots is favored by selection within families, not benefits to conspecific brood parasites |
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