American coot#Maternal effects
{{Short description|Species of bird}}
{{Redirect|Mud hen|the baseball team|Toledo Mud Hens|other uses}}
{{Speciesbox
| name = American coot
| image = American coot in Prospect Park (06152).jpg
| image_caption = American coot in New York City
| status = LC
| status_system = IUCN3.1
| taxon = Fulica americana
| authority = Gmelin, JF, 1789
| range_map = Fulica_americana_map.svg
| range_map_caption = {{leftlegend|#Ff9955|Breeding range|outline=gray}}{{leftlegend|#87aade|Winter-only range|outline=gray}}{{leftlegend|#aa87de|Year-round range|outline=gray}}{{leftlegend|#ffe680|Passage|outline=gray}}
| synonyms = * Fulica hesterna Howard, 1963
and see text
}}
The American coot (Fulica americana), also known as a mud hen or pouldeau, is a bird of the family Rallidae. Though commonly mistaken for ducks, American coots are only distantly related to ducks, belonging to a separate order. Unlike the webbed feet of ducks, coots have broad, lobed scales on their lower legs and toes that fold back with each step to facilitate walking on dry land. Coots live near water, typically inhabiting wetlands and open water bodies in North America. Groups of coots are called covers[https://baltimorebirdclub.org/gnlist.html Group Names for Birds], Baltimore Bird Club or rafts. The oldest known coot lived to be 22 years old.
The American coot is a migratory bird that occupies most of North America. It lives in the Pacific and southwestern United States and Mexico year-round and occupies more northeastern regions during the summer breeding season. In the winter they can be found as far south as Panama. Coots generally build floating nests and lay 8–12 eggs per clutch. Females and males have similar appearances, but they can be distinguished during aggressive displays by the larger ruff (head plumage) on the male.{{cite journal|last=Gullion|first=Gordon W.|title=The Displays and Calls of the American Coot|journal=The Wilson Bulletin|year=1952|volume=64|issue=2|pages=83–97|jstor=4158081}} American coots eat primarily algae and other aquatic plants but also animals (both vertebrates and invertebrates) when available.
The American coot is closely related to the Eurasian coot (Fulica atra), which occupies the same ecological niche in Eurasia and Australia as the American coot does in North America.{{cn|date=July 2024}} Eurasian coots can be distinguished from this species by the absence of a red callus above the bird's frontal shield.{{cn|date=July 2024}}
The American coot is listed as "Least Concern" under the IUCN conservation ratings. Hunters generally avoid killing American coots because their meat is not as sought after as that of ducks.
American coots display several interesting breeding habits; mothers will preferentially feed offspring with the brightest plume feathers, which has resulted in coot chicks having brightly ornamented plumage which becomes drabber as they age.{{Cite web |last=Stephens |first=Tim |date=30 December 2019 |title=The mysterious case of the ornamented coot chicks has a surprising explanation |url=https://news.ucsc.edu/2019/12/colorful-coots.html |website=UC Santa Cruz}}{{cite book |last1=Davies |first1=Nicholas B. |last2=Krebs |first2=John R. |last3=West |first3=Stuart A. |title=Behavioural Ecology |year=2012 |publisher=John Wiley and Sons |location=West Sussex, UK |isbn=9781405114165 |chapter=8}} American coots are also susceptible to conspecific brood parasitism and have evolved mechanisms to differentiate their offspring from those of parasitic females.
Taxonomy and systematics
File:Anas strepera 06271.JPG]]
The American coot was formally described in 1789 by the German naturalist Johann Friedrich Gmelin in his revised and expanded edition of Carl Linnaeus's Systema Naturae. He placed it with all the other coots in the genus Fulica and coined the binomial name Fulica americana.{{ cite book | last=Gmelin | first=Johann Friedrich | author-link=Johann Friedrich Gmelin| year=1789 | title=Systema naturae per regna tria naturae : secundum classes, ordines, genera, species, cum characteribus, differentiis, synonymis, locis | edition=13th | volume=1, Part 2 | language=Latin | location=Lipsiae [Leipzig] | publisher=Georg. Emanuel. Beer | page=704 | url=https://www.biodiversitylibrary.org/page/2656197 }} Gmelin based his description on the "Cinereous coot" from North America that had been described in 1785 by the English ornithologist John Latham in his book A General Synopsis of Birds.{{ cite book | last=Latham | first=John | author-link=John Latham (ornithologist) | year=1785 | title=A General Synopsis of Birds | volume=3, Part 1 | publisher=Printed for Leigh and Sotheby | location=London | page=279 | url=https://www.biodiversitylibrary.org/page/40079062 }}
= Subspecies =
Two subspecies are recognised:{{cite web| editor1-last=Gill | editor1-first=Frank | editor1-link=Frank Gill (ornithologist) | editor2-last=Donsker | editor2-first=David | editor3-last=Rasmussen | editor3-first=Pamela | editor3-link=Pamela Rasmussen | date= August 2022 | title=Flufftails, finfoots, rails, trumpeters, cranes, limpkin | work=IOC World Bird List Version 12.2 | url=https://www.worldbirdnames.org/new/bow/flufftails/ | publisher=International Ornithologists' Union | access-date=12 October 2022 }}
- F. a. americana Gmelin, JF, 1789 – southeast Alaska and Canada to Costa Rica and the West Indies
- F. a. columbiana Chapman, 1914 – Colombia and north Ecuador
The Caribbean coot, a color morph of the American coot is now included with the nominate subspecies.{{cite journal| last1=Chesser | first1=R. Terry | last2=Burns | first2=Kevin J. | last3=Cicero | first3=Carla | last4=Dunn | first4=John L. | last5=Kratter | first5=Andrew W | last6=Lovette | first6=Irby J | last7=Rasmussen | first7=Pamela C. | last8=Remsen | first8=J.V. Jr | last9=Rising | first9=James D. | last10=Stotz | first10=Douglas F. | last11=Winker | first11=Kevin | year=2017 | title=Fifty-seventh supplement to the American Ornithological Society's Check-list of North American Birds |journal=The Auk |volume=133 | issue=3 |pages=544–560 |doi=10.1642/AUK-16-77.1 | doi-access=free }}
= Fossil record =
Coot fossils from the Middle Pleistocene of California have been described as Fulica hesterna but cannot be separated from the present-day American coot.{{cite journal|last=Olson|first=Storrs L.|title=The Pleistocene Rails of North America|journal=Museum of Natural History|year=1974}} However, the Pleistocene coot Fulica shufeldti (formerly F. minor), famously known as part of the Fossil Lake fauna, quite possibly was a paleosubspecies of the American coot (as Fulica americana shufeldti) as they only differed marginally in size and proportions from living birds.{{cite journal|last=Jehl|first=Joseph R.|title=Pleistocene Birds from Fossil Lake, Oregon|journal=The Condor|year=1967|volume=69|issue=1|url=http://sora.unm.edu/node/101598|pages=24–27|doi=10.2307/1366369|jstor=1366369|url-access=subscription}} Thus, it seems that the modern-type American coots evolved during the mid-late Pleistocene, a few hundred thousand years ago.
The American coot's genus name, Fulica, is a direct borrowing of the Latin word for "coot".{{cite book|last=Jobling|first=James A.|title=Helm Dictionary of Scientific Bird Names|url=https://archive.org/details/helmdictionarysc00jobl_997|url-access=limited|year=2009|publisher=Christopher Helm Publishers|isbn=978-1408125014|pages=[https://archive.org/details/helmdictionarysc00jobl_997/page/n165 165]}} The specific epithet americana means "America".{{cite book|last=Jobling|first=James A.|title=Helm Dictionary of Scientific Bird Names|url=https://archive.org/details/helmdictionarysc00jobl_997|url-access=limited|year=2009|publisher=Christopher Helm Publishers|isbn=978-1408125014|pages=[https://archive.org/details/helmdictionarysc00jobl_997/page/n44 44]}}
Description
File:American Coots fighting.jpg
The American coot measures {{convert|34|-|43|cm|in|abbr=on}} in length with a wingspan of {{convert|58|to|71|cm|in|abbr=on}}. Adults have a short, thick, white bill and white frontal shield, which usually has a reddish-brown spot near the top of the bill between the eyes. Males and females look alike, but females are smaller. Body mass in females ranges from {{convert|427|to|628|g|lb|abbr=on}} and in males from {{convert|576|to|848|g|lb|abbr=on}}.CRC Handbook of Avian Body Masses by John B. Dunning Jr. (Editor). CRC Press (1992), {{ISBN|978-0-8493-4258-5}}.{{cite web|title=American Coot|url=http://www.arkive.org/american-coot/fulica-americana/#text=Facts|publisher=Arkive|access-date=11 July 2013|archive-url=https://web.archive.org/web/20131119104908/http://www.arkive.org/american-coot/fulica-americana/#text=Facts#text=Facts|archive-date=2013-11-19|url-status=dead}}[http://www.oiseaux-birds.com/card-american-coot.html American Coot – Fulica americana]. oiseaux-birds.com Juvenile birds have olive-brown crowns and a gray body. They become adult-colored around 4 months of age.
= Frontal shield and callus =
{{inline citations needed|subsection|date=April 2024}}
The American coot is recognized by its white frontal shield with a red spot connecting its eyes. The size of the frontal shield depends on season and mating status. During the winter season, birds have smaller, 'shrunken' shields. During breeding season, birds are recorded to have swelled shields. Birds that are permanently paired or mated have larger shields as well.
According to a 1949 coverage by [https://archives.lib.umn.edu/repositories/14/resources/9468 Gordon W. Gullion], the reddish-brown spot on the frontal shield is not considered a part of the frontal shield despite its proximity to the shield. It is known as the callus. This is due to the fact that it does not completely cover the maxilla, or jawbone, of the coot. It also differs in color and texture from the shield.
=Vocalizations=
The American coot has a variety of repeated calls and sounds. Male and female coots make different types of calls to similar situations. Male alarm calls are {{Not a typo|puhlk}} while female alarm calls are {{Not a typo|poonk}}. Also, stressed males go {{Not a typo|puhk-cowah}} or {{Not a typo|pow-ur}} while females call {{Not a typo|cooah}}.{{cite book|last=Hoyo|first=Josep del|title=Handbook of the Birds of the World|year=1996|publisher=Lynx Edicions|isbn=978-8487334207|url-access=registration|url=https://archive.org/details/handbookofbirdso0001unse}}
Distribution and habitat
American coots are found near water reed-ringed lakes and ponds, open marshes, and sluggish rivers. They prefer freshwater environments but may temporarily live in saltwater environments during the winter months.
The American coot's breeding habitat extends from marshes in southern Quebec to the Pacific coast of North America and as far south as northern South America. Birds from temperate North America east of the Rocky Mountains migrate to the southern United States and southern British Columbia. It is often a year-round resident where water remains open in winter. The number of birds that stay year-round near the northern limit of the species' range seems to be increasing.{{cite journal|last=Henninger|first=W. F.|title=A Preliminary List of Birds in Seneca County, Ohio|journal=The Wilson Bulletin|year=1906|volume=18|issue=2|pages=47–60|url=http://sora.unm.edu/node/123938|jstor=4154076}}{{cite web|title=American Coot|url=http://www.ohiobirds.org/obba2/pdfs/species/AmericanCoot.pdf|publisher=Ohio Ornithological Society|access-date=21 January 2013}}
Autumn migration occurs from August to December, with males and non-breeders moving south before the females and juveniles. Spring migration to breeding ranges occurs from late February to mid-May, with males and older birds moving North first. There has been evidence of birds travelling as far north as Greenland and Iceland.
=Caribbean coot=
Coots resident in the Caribbean and Greater and Lesser Antilles lack the red portion of the frontal shield, and were previously believed to be a distinct species, the Caribbean coot (Fulica caribaea). In 2016, due to research showing that the only distinguishing characteristic between American and Caribbean coots, the presence or absence of red in the frontal shield, was not distinct to Caribbean coots as some American coots, in locations where vagrancy from Caribbean populations was highly unlikely, had fully white shields and, therefore, there was no way to reliably distinguish the species, and there was no evidence of Caribbean and American coots engaging in assortative mating,{{cite web|url=http://blog.aba.org/2016/07/2016-aou-supplement.html|title=2016 AOU Supplement is Out!|last=Retter|first=Michael|date=July 7, 2016|publisher=American Birding Association|access-date=2016-08-17}} the American Ornithological Society lumped the Caribbean coot as a regional variation of the American coot.{{cite web|url=https://lfpress.com/2016/08/03/the-world-outdoors-climate-change-shifting-bird-ranges|title=The World Outdoors: Climate change shifting bird ranges|last=Nicholson|first=Paul|date=August 3, 2016|work=The London Free Press|access-date=2016-08-17|location=London, Ontario}}{{cite web|url=http://www.birds.cornell.edu/clementschecklist/updates-corrections-august-2016/|title=Clements Checklist: Updates & Corrections – August 2016|date=August 9, 2016|publisher=Cornell Laboratory of Ornithology|access-date=2016-08-17|archive-url=https://web.archive.org/web/20160817014601/http://www.birds.cornell.edu/clementschecklist/updates-corrections-august-2016/|archive-date=2016-08-17}}
Behavior and ecology
The American coot is a highly gregarious species, particularly in the winter, when its flocks can number in the thousands. When swimming on the water surface, American coots exhibit a variety of interesting collective formations, including single-file lines, high density synchronized swimming and rotational dynamics, broad arcing formations, and sequential take-off dynamics.{{Cite journal|last=Trenchard|first=Hugh|date=2013|title=American coot collective on-water dynamics|journal=Nonlinear Dynamics, Psychology, and Life Sciences |volume=17 |issue=2 |pages=183–203|pmid=23517605 }}
=Feeding=
The American coot can dive for food but can also forage and scavenge on land. Their principal source of food is aquatic vegetation, especially algae. Yet they are omnivorous, also eating arthropods, fish, and other aquatic animals. During breeding season, coots are more likely to eat aquatic insects and mollusks—which constitute the majority of a chick's diet.
File:COOT, AMERICAN (5-17-11) with juv, patagonia lake, scc, az -01 (5731502115).jpg|Foraging
File:American Coot Catching a Worm.jpg|Eating a worm
File:Coot Family Dinner (50058664276).jpg|Eating algae
File:American Coot, Mazatlán, Sin., México imported from iNaturalist photo 250332844.jpg|With fish
=Breeding=
File:American coots mating.jpg
File:Nesting-american-coot.jpg
The coot mating season occurs during May and June.{{cite web|last=Bridgman|first=Allison|title=American Coot|url=http://www.biokids.umich.edu/critters/Fulica_americana/|work=BioKids|publisher=University of Michigan|access-date=11 July 2013|author2=Rudi Berkelhamer}} Coot mate pairings are monogamous throughout their life, given they have a suitable territory. A typical reproductive cycle involves multiple stages: pairing, nesting, copulation, egg deposition, incubation, and hatching.{{cite journal|last=Gullion|first=Gordon|title=Reproductive Cycle in American Coots|journal=Auk|date=October 1954|volume=71|issue=4|pages=366–412|url=http://sora.unm.edu/node/20283|jstor=4081536|doi=10.2307/4081536|doi-access=free}}
The American coot typically has long courtship periods. This courtship period is characterized by billing, bowing, and nibbling. Males generally initiate billing, which is the touching of bills between individuals. As the pair bond becomes more evident, both males and females will initiate billing only with each other and not other males or females. After a pair bond is cemented, the mating pair looks for a territory to build a nest in. A pair bond becomes permanent when a nesting territory is secured. Copulation behavior among coot pairs always falls under the same general pattern. First the male chases the female. Then, the female moves to the display platform and squats with her head under the water. The male then mounts the female, using his claws and wings to balance on the female's back while she brings her head above the water. Sexual intercourse usually takes no longer than two seconds.
==Nests==
The American coot is a prolific builder and will create multiple structures during a single breeding season. It nests in well-concealed locations in tall reeds. There are three general types of structures: display platforms, egg nests and brood nests.
- Display platforms are used as roosting sites and are left to decompose after copulation.
- Egg nests are typically {{Convert|30|cm|in|abbr = on}} in diameter with a {{Convert|30|-|38|cm|in|abbr = on}} ramp that allows the parents to enter and exit without tearing the sides of the nests. Coots will often build multiple egg nests before selecting one to lay their eggs in.
- Brood nests are nests that are either newly constructed or have been converted from old egg nests after the eggs hatch, becoming larger egg nests.
Since American coots build on the water, their structures disintegrate easily and have short life spans. Egg and brood nests are actually elaborate rafts, and must be constantly added to in order to stay afloat. Females typically do the most work while building.
==Egg-laying and clutch size==
Females deposit one egg a day until the clutch is complete. Eggs are usually deposited between sunset and midnight. Typically, early season and first clutches average two more eggs than second nestings and late season clutches. Early season nests see an average of 9.0 eggs per clutch while late clutches see an average of 6.4 eggs per clutch. There is an inverse relationship between egg weights and laying sequence,{{cite journal|last=Alisauskas|first=Ray T.|title=Variation in the Composition of the Eggs and Chicks of American Coots|journal=The Condor|date=Feb 1986|volume=88|issue=1|pages=84–90|url=http://sora.unm.edu/node/103649|jstor=1367757|doi=10.2307/1367757|url-access=subscription}} wherein earlier eggs are larger than eggs laid later in the sequence. It is possible to induce a female coot to lay more eggs than normal by either removing all or part of her clutch. Sometimes, a female may abandon the clutch if enough eggs are removed. Coots, however, do not respond to experimental addition of eggs by laying fewer eggs.{{cite journal|last=Arnold|first=Todd W.|title=Continuous Laying by American Coots in Response to Partial Clutch Removal and Total Clutch Loss|journal=The Auk|date=July 1992|volume=109|issue=3|series=3|pages=407–421|url=http://sora.unm.edu/node/25126|jstor=4088356}}
The American coot is a persistent re-nester, and will replace lost clutches with new ones within two days of clutch-loss during deposition. One study showed that 68% of destroyed clutches are eventually replaced. Re-nested clutches are typically smaller than original clutches by one or two eggs, but this could be attributed to differences in time and habitat quality instead of food or nutrient reserves and availability.{{cite journal|last=Arnold|first=Todd W.|title=Factors Affecting Renesting in American Coots|journal=The Condor|date=May 1993|volume=95|issue=2|pages=273–281|url=http://sora.unm.edu/node/104704|jstor=1369349|doi=10.2307/1369349|url-access=subscription}}
Younger females reproduce later in the season and produce smaller eggs than older females. Their offspring are also smaller. However, there is no difference in clutch size between older and younger females as there is in other avian species.{{cite journal|last=Crawford|first=Richard D.|title=Effects of Age on Reproduction in American Coots|journal=The Journal of Wildlife Management|date=Jan 1980|volume=44|issue=1|series=1|pages=183–189|jstor=3808364|doi=10.2307/3808364}}File:American Coot skeleton.jpg)]]
==Incubation and hatching==
Incubation start time in the American coot is variable, and can begin anywhere from the deposition of the first egg to after the clutch is fully deposited. Starting incubation before the entire clutch has been laid is an uncommon practice among birds.{{cite journal|last=Fredrickson|first=Leigh H.|title=An Experimental Study of Clutch Size of the American Coo|journal=The Auk|date=July 1969|volume=86|series=3|pages=541–550|url=http://sora.unm.edu/node/21886|jstor=4083414|doi=10.2307/4083414|issue=3|doi-access=free}} Once incubation starts it continues without interruption. Male and female coots share incubation responsibility, but males do most of the work during the 21-day incubation period. Females will begin to re-nest clutches in an average of six days if clutches are destroyed during incubation.
Hatch order usually follows the same sequence as laying order. Regardless of clutch size, eight is the typical maximum size of a brood. Egg desertion is a frequent occurrence among coots because females will often deposit more than eight eggs. Brood size limits incubation time, and when a certain number of chicks have hatched the remaining eggs are abandoned. The mechanism for egg abandonment has not yet been discovered. Food resource constraints may limit the number of eggs parents let hatch, or the remaining eggs may not provide enough visual or tactile stimulation to elicit incubation behavior. An American coot can be forced to hatch more eggs than are normally laid. These additional offspring, however, suffer higher mortality rates due to inadequacy in brooding or feeding ability.{{cite journal|last=Ryan|first=Mark R.|author2=James J. Dinsmore|title=A Quantitative Study of the Behavior of Breeding American Coots|journal=The Auk|date=May 1979|volume=96|pages=704–713|url=http://sora.unm.edu/sites/default/files/journals/auk/v096n04/p0704-p0713.pdf}}
==Maternal effects==
Hormones that are passed down from the mother into the egg affect offspring growth, behavior, and social interactions. These nongenetic contributions by the mother are known as maternal effects. In the American coot, two levels of androgen and testosterone variation have been discovered—within-clutch and among-clutch variation. Within the same clutch, eggs laid earlier in the sequence have higher testosterone levels than eggs laid later in the sequence. Females that lay three clutches deposit more androgens into their yolks than females who lay only one or two clutches.{{cite journal|last=Reed|first=Wendy L.|author2=Carol M. Vleck|title=Functional significance of variation in egg-yolk androgens in the American coot|journal=Oecologia|date=March 2001|volume=128|pages=164–171|url=http://www.public.iastate.edu/~cvleck/pdf/2001Oec.pdf|doi=10.1007/s004420100642|pmid=28547464|issue=2|bibcode=2001Oecol.128..164R |s2cid=2798198 |access-date=2012-10-10|archive-url=https://web.archive.org/web/20150924083054/http://www.public.iastate.edu/~cvleck/pdf/2001Oec.pdf|archive-date=2015-09-24|url-status=dead}}
=Brood parasitism=
The American coot has a mixed reproductive strategy, and conspecific brood parasitism is a common alternative reproductive method. In one 4-year study, researchers found that 40% of nests were parasitized, and that 13% of all eggs were laid by females in nests that were not their own.{{cite journal|last=Lyon|first=Bruce|title=Conspecfic brood parasitism as a flexible female reproductive tactic in American coots|journal=Animal Behaviour|date=October 1992|volume=46|pages=911–928|url=http://bio.research.ucsc.edu/people/lyon/Lyon%20reprints/Lyon_1993.pdf|doi=10.1006/anbe.1993.1273|issue=5|s2cid=53188986|display-authors=etal|access-date=2012-09-25|archive-date=2013-12-03|archive-url=https://web.archive.org/web/20131203065249/http://bio.research.ucsc.edu/people/lyon/Lyon%20reprints/Lyon_1993.pdf|url-status=dead}} Increasing reproductive success under social and ecological constraints is the primary reason for brood parasitism. Floater females without territories or nests use brood parasitism as their primary method of reproduction, if they breed at all. Other females may engage in brood parasitism if their partially complete clutches are destroyed. Conspecific brood parasitic behavior is most common among females trying to increase their total number of offspring. Food supply is the limiting factor to chick survival and starvation is the most common cause of chick morbidity. Parasitic females bypass the parental care constraint of feeding by laying additional parasitic eggs in addition to their normal nest.
When a parasitic female lays her egg in a host female's nest, the host female experiences a deposition rate of two eggs per day. Host females may recognize parasitic eggs when the egg deposition pattern deviates from the traditional one egg per day pattern. The occurrence of brood parasitism may be influenced by the body size of the potential parasitic female relative to the potential host female. Parasitic females are generally larger than their host counterparts, but on average, there is no size difference between the parasite and the host.{{cite journal|last=Lyon|first=Bruce|title=Ecological and social constraints on conspecific brood parasitism by nesting female American coots (Fulica americana)|journal=Journal of Animal Ecology|year=2003|volume=72|issue=1 |pages=47–61|doi=10.1046/j.1365-2656.2003.00674.x|display-authors=etal|doi-access=free|bibcode=2003JAnEc..72...47L }}
The American coot, unlike other parasitized species, has the ability to recognize and reject conspecific parasitic chicks from their brood.{{cite journal|last=Shizuka|first=Daizaburo|author2=Lyon, Bruce E.|title=Coots use hatch order to recognize and reject conspecific brood parasitic chicks|journal=Nature|volume=463|pages=223–226|doi=10.1038/nature08655|pmid=20016486|issue=7278|date=16 December 2009|s2cid=4161373 |url=http://digitalcommons.unl.edu/cgi/viewcontent.cgi?article=1085&context=biosciornithology|url-access=subscription}} Parents aggressively reject parasite chicks by pecking them vigorously, drowning them, preventing them from entering the nest, etc. They learn to recognize their own chicks by imprinting on cues from the first chick that hatches. The first-hatched chick is a reference to which parents discriminate between later-hatched chicks. Chicks that do not match the imprinted cues are then recognized as parasite chicks and are rejected.
Chick recognition reduces the costs associated with parasitism, and coots are one of only three bird species in which this behavior has evolved. This is because hatching order is predictable in parasitized coots—host eggs will reliably hatch before parasite eggs. In other species where hatching order is not as reliable, there is a risk of misimprinting on a parasite chick first and then rejecting their own chicks. In these species, the cost of accidentally misimprinting is greater than the benefits of rejecting parasite chicks.
=Chick ornaments=
The first evidence for parental selection of exaggerated, ornamental traits in offspring was found in American coots.{{cite journal|last=Lyon|first=Bruce|title=Parental choice selects for ornamental plumage in American Coot chicks|journal=Nature|date=September 1994|volume=371|pages=240–242|doi=10.1038/371240a0|issue=6494|bibcode=1994Natur.371..240L |s2cid=4239627 |display-authors=etal}} Black American coot chicks have conspicuously orange-tipped ornamental plumes covering the front half of their body that are known as "chick ornaments" that eventually get bleached out after six days. This brightly colored, exaggerated trait makes coot chicks more susceptible to predation and does not aid in thermoregulation, but remains selected for by parental choice. These plumes are not necessary for chick viability, but increased chick ornamentation increases the likelihood that a chick will be chosen as a favorite by the parents. Experimental manipulation of chick ornamentation by clipping the bright plumes has shown that parents prefer ornamented chicks over non-ornamented ones.
File:Fulica americana3.jpg|Young chicks
File:COOT, COMMON (5-13-11) patagonia lake, scc, az -05 (5716774372).jpg|Older chicks
File:American coot (Fulica americana columbiana) with juvenile Cundinamarca.jpg|Young juvenile
File:Juvenille American Coot on Seedskadee NWR (22992983235).jpg|Older juvenile
File:American coot lake apopka wr 1.28.24 DSC 8350-topaz-denoiseraw-sharpen.jpg|Adult
Predation
File:Haliaeetus leucocephalus (Bald Eagle) 32.jpg pursuing an American coot]]
The American coot is fairly aggressive in defense of its eggs and, in combination with their protected nesting habitat, undoubtedly helps reduce losses of eggs and young to all but the most determined and effective predators. American crows, black-billed magpies and Forster's tern can sometimes take eggs. Mammalian predators (including red foxes, coyotes, skunks and raccoons) are even less likely to predate coot nests, though nests are regularly destroyed in usurpation by muskrats. Conversely, the bold behavior of immature and adult coots leads to them falling prey with relative regularity once out of the breeding season. Regular, non-nesting-season predators include great horned owls, northern harriers, bald eagles, golden eagles, American alligators, bobcats, great black-backed and California gulls. In fact, coots may locally comprise more than 80% of the bald eagle diet.{{cite journal|last1=Brisbin Jr.|first1=I. Lehr|last2=Mowbray|first2=Thomas B.|last3=Poole|first3=A.|last4=Gill|first4=F.|title=American Coot (Fulica americana)|journal=The Birds of North America Online|year=2002|doi=10.2173/bna.697a|editor1-last=Poole|editor1-first=A|editor2-last=Gill|editor2-first=F}}
In culture
File:Brooklyn Museum - American Coot - John J. Audubon.jpg]]On the Louisiana coast, the Cajun word for coot is pouldeau, from French for "coot", poule d'eau – literally "water hen". Coot can be used for cooking; it is somewhat popular in Cajun cuisine, for instance as an ingredient for gumbos cooked at home by duck hunters.{{cite web|last=Horst|first=Gerald|title=Chuck Buckley's Duck (Coot) Gumbo|url=http://www.louisianasportsman.com/details.php?id=4545|publisher=Louisiana Sportsman|access-date=11 July 2013|archive-url=https://web.archive.org/web/20131203020748/http://www.louisianasportsman.com/details.php?id=4545|archive-date=3 December 2013|url-status=dead}}
The bird is the mascot of the Toledo Mud Hens Minor League Baseball team.{{cite web|title=Toledo Mudhens|url=http://www.milb.com/index.jsp?sid=t512|publisher=Minor League Baseball|access-date=11 July 2013}}File:20241110 american coot bolton notch sp wm.webm
Conservation and threats
The American coot is listed under "least concern" by the IUCN Red List of Endangered Species. They are common and widespread, and are sometimes even considered a pest. They are rarely the targets of hunters since their meat is not considered to be as good as that of ducks; although some are shot for sport, particularly in the southeastern United States. Because they are found in wetlands, scientists use them to monitor toxin levels and pollution problems in these environments.{{cite web|title=American Coot|url=http://www.allaboutbirds.org/guide/american_Coot/lifehistory|work=allaboutbirds.org}}
References
{{Reflist|35em| refs=
{{cite book
| first = Pete
| last = Dunne
| title = Pete Dunne's Essential Field Companion
| year = 2006
| location = New York, NY, USA
| publisher = Houghton, Mifflin
| isbn = 978-0-618-23648-0
| pages = [https://archive.org/details/petedunnesessent00dunn/page/189 189]–190
| url = https://archive.org/details/petedunnesessent00dunn | url-access = registration
}}
}}
=Cited sources=
- {{cite book
| last = Jobling
| first = James A.
| year = 2009
| title = Helm Dictionary of Scientific Bird Names
| publisher = Christopher Helm
| location= London, UK
| isbn = 978-1-4081-2501-4 }}
External links
{{Commons category|Fulica americana}}
{{Wikispecies|Fulica americana}}
- [http://www.mbr-pwrc.usgs.gov/id/framlst/i2210id.html American Coot – Fulica americana] – USGS Patuxent Bird Identification InfoCenter.
- [http://www.birds.cornell.edu/AllAboutBirds/BirdGuide/American_Coot.html American Coot Species Account] – Cornell Lab of Ornithology
- {{InternetBirdCollection|american-coot-fulica-americana|American Coot}}
- {{VIREO|american+coot|American Coot}}
{{Taxonbar|from=Q470016}}
{{Authority control}}
Category:Birds of North America
Category:Birds of the United States
Category:Birds of the Caribbean
Category:Birds of the Dominican Republic