{"id":828,"date":"2018-01-18T22:15:25","date_gmt":"2018-01-18T22:15:25","guid":{"rendered":"https:\/\/courses.lumenlearning.com\/wm-nmbiology2\/chapter\/the-life-cycle-of-amphibians\/"},"modified":"2018-06-20T17:26:30","modified_gmt":"2018-06-20T17:26:30","slug":"the-life-cycle-of-amphibians","status":"publish","type":"chapter","link":"https:\/\/courses.lumenlearning.com\/atd-herkimer-biologyfundamentals1\/chapter\/the-life-cycle-of-amphibians\/","title":{"raw":"The Life Cycle of Amphibians","rendered":"The Life Cycle of Amphibians"},"content":{"raw":"<div class=\"textbox learning-objectives\">\r\n<h3>Learning Outcomes<\/h3>\r\n<ul>\r\n \t<li>Describe the important difference between the life cycle of amphibians and the life cycles of other vertebrates<\/li>\r\n<\/ul>\r\n<\/div>\r\n<strong>Metamorphosis<\/strong> is a biological process by which an animal physically develops after birth or hatching, involving a conspicuous and relatively abrupt change in the animal's body structure through cell growth and differentiation (Figure 1). Metamorphosis is iodothyronine-induced and an ancestral feature of all chordates.[footnote]Robert J. Denver.\u00a0<a href=\"http:\/\/www.cell.com\/current-biology\/pdf\/S0960-9822(08)00661-1.pdf\" target=\"_blank\" rel=\"noopener\">Chordate Metamorphosis: Ancient Control by Iodothyronines.<\/a>\u00a0<em>Current Biology<\/em>, 2008, Vol 18 No 13, R567-9. DOI: 10.1016\/j.cub.2008.05.024[\/footnote] Some insects, fishes, amphibians, mollusks, crustaceans, cnidarians, echinoderms and tunicates undergo metamorphosis, which is often accompanied by a change of nutrition source or behavior. Animals that goes through metamorphosis are called <strong>metamorphoses<\/strong>. Very few vertebrates undergo metamorphosis, but all the amphibians do to some extent.\r\n\r\n[caption id=\"attachment_3629\" align=\"aligncenter\" width=\"1024\"]<img class=\"size-large wp-image-3629\" src=\"https:\/\/s3-us-west-2.amazonaws.com\/courses-images\/wp-content\/uploads\/sites\/2840\/2018\/01\/18221518\/1024px-Greenfrog_life_stages.svg_-1024x765.png\" alt=\"Throughout a frog's life, it adopts several different forms, changing its body through metamorphosis. It starts as an egg, hatches into a tadpole, becomes a frog.\" width=\"1024\" height=\"765\" \/> Figure 1. The life cycle of a green frog.[\/caption]\r\n<h2>Amphibians<\/h2>\r\nIn typical amphibian development, eggs are laid in water and larvae are adapted to an aquatic lifestyle. Frogs, toads, and newts all hatch from the eggs as larvae with external gills but it will take some time for the amphibians to interact outside with pulmonary respiration. Afterwards, newt larvae start a predatory lifestyle, while tadpoles mostly scrape food off surfaces with their horny tooth ridges.\r\n\r\nMetamorphosis in amphibians is regulated by thyroxin concentration in the blood, which stimulates metamorphosis, and prolactin, which counteracts its effect. Specific events are dependent on threshold values for different tissues. Because most embryonic development is outside the parental body, development is subject to many adaptations due to specific ecological circumstances. For this reason tadpoles can have horny ridges for teeth, whiskers, and fins. They also make use of the lateral line organ. After metamorphosis, these organs become redundant and will be resorbed by controlled cell death, called apoptosis. The amount of adaptation to specific ecological circumstances is remarkable, with many discoveries still being made.\r\n<h3>Frogs and toads<\/h3>\r\nWith frogs and toads, the external gills of the newly hatched tadpole are covered with a gill sac after a few days, and lungs are quickly formed. Front legs are formed under the gill sac, and hindlegs are visible a few days later. Following that there is usually a longer stage during which the tadpole lives off a vegetarian diet. Tadpoles use a relatively long, spiral\u2010shaped gut to digest that diet.\r\n\r\nRapid changes in the body can then be observed as the lifestyle of the frog changes completely. The spiral\u2010shaped mouth with horny tooth ridges is resorbed together with the spiral gut. The animal develops a big jaw, and its gills disappear along with its gill sac. Eyes and legs grow quickly, a tongue is formed, and all this is accompanied by associated changes in the neural networks (development of stereoscopic vision, loss of the lateral line system, etc.) All this can happen in about a day, so it is truly a metamorphosis (Figure 2). It is not until a few days later that the tail is reabsorbed, due to the higher thyroxin concentrations required for tail resorption.\r\n\r\n[caption id=\"attachment_3618\" align=\"aligncenter\" width=\"1024\"]<img class=\"wp-image-3618 size-large\" src=\"https:\/\/s3-us-west-2.amazonaws.com\/courses-images\/wp-content\/uploads\/sites\/2840\/2018\/01\/18221521\/RanaTemporariaLarva2-1024x418.jpg\" alt=\"Image a shows a tadpole. Image b shows a frog that still has a tail.\" width=\"1024\" height=\"418\" \/> Figure 2. (a) Just before metamorphosis, only 24 hours are needed to reach the stage in part b. (b) Almost functional common frog with some remains of the gill sac and a not fully developed jaw[\/caption]\r\n<h3>Salamanders<\/h3>\r\nSalamander development is highly diverse; some species go through a dramatic reorganization when transitioning from aquatic larvae to terrestrial adults, while others, such as the Axolotl, display paedomorphosis and never develop into terrestrial adults. Within the genus Ambystoma, species have evolved to be paedomorphic several times, and paedomorphosis and complete development can both occur in some species.[footnote]Laudet, Vincent. 2011. \u201cThe Origins and Evolution of Vertebrate Metamorphosis.\u201d\u00a0<em>Current Biology<\/em> 21: R726\u2013R737[\/footnote]\r\n<h3>Newts<\/h3>\r\n[caption id=\"attachment_3619\" align=\"alignright\" width=\"350\"]<img class=\"wp-image-3619\" src=\"https:\/\/s3-us-west-2.amazonaws.com\/courses-images\/wp-content\/uploads\/sites\/2840\/2018\/01\/18221524\/LarveKamsalamander.jpg\" alt=\"Crested Newt Triturus cristatus larval stage\" width=\"350\" height=\"263\" \/> Figure 3. The large external gills of the crested newt[\/caption]\r\n\r\nIn newts, there is no true metamorphosis because newt larvae already feed as predators and continue doing so as adults. Newts' gills are never covered by a gill sac (Figure 3) and will be resorbed only just before the animal leaves the water. Just as in tadpoles, their lungs are functional early, but newts use them less frequently than tadpoles. Newts often have an aquatic phase in spring and summer, and a land phase in winter. For adaptation to a water phase, prolactin is the required hormone, and for adaptation to the land phase, thyroxin. External gills do not return in subsequent aquatic phases because these are completely absorbed upon leaving the water for the first time.\r\n<h3>Caecilians<\/h3>\r\nBasal caecilians such as Ichthyophis go through a metamorphosis in which aquatic larva transition into fossorial adults, which involves a loss of the lateral line.[footnote]Dunker, Nicole, Marvalee H. Wake, Wendy M. Olson. 2000. \u201cEmbryonic and Larval Development in the Caecilian Ichthyophis kohtaoensis (Amphibia, Gymnophiona): A Staging Table\u201d <em>Journal of Morphology<\/em> 243: 3\u201334[\/footnote] More recently diverged caecilians (the Teresomata) do not undergo an ontogenetic niche shift of this sort and are in general fossorial throughout their lives. Thus, most caecilians do not undergo an anuran-like metamorphosis.[footnote]San Mauro, D., Gower, D. J., Oommen, O. V., Wilkinson, M. &amp; Zardoya, R. 2004. \"Phylogeny of caecilian amphibians (Gymnophiona) based on complete mitochondrial genomes and nuclear RAG1.\"\u00a0<em>Molecular Phylogenetics and Evolution<\/em> 33: 413\u2013427.[\/footnote]","rendered":"<div class=\"textbox learning-objectives\">\n<h3>Learning Outcomes<\/h3>\n<ul>\n<li>Describe the important difference between the life cycle of amphibians and the life cycles of other vertebrates<\/li>\n<\/ul>\n<\/div>\n<p><strong>Metamorphosis<\/strong> is a biological process by which an animal physically develops after birth or hatching, involving a conspicuous and relatively abrupt change in the animal&#8217;s body structure through cell growth and differentiation (Figure 1). Metamorphosis is iodothyronine-induced and an ancestral feature of all chordates.<a class=\"footnote\" title=\"Robert J. Denver.\u00a0Chordate Metamorphosis: Ancient Control by Iodothyronines.\u00a0Current Biology, 2008, Vol 18 No 13, R567-9. DOI: 10.1016\/j.cub.2008.05.024\" id=\"return-footnote-828-1\" href=\"#footnote-828-1\" aria-label=\"Footnote 1\"><sup class=\"footnote\">[1]<\/sup><\/a> Some insects, fishes, amphibians, mollusks, crustaceans, cnidarians, echinoderms and tunicates undergo metamorphosis, which is often accompanied by a change of nutrition source or behavior. Animals that goes through metamorphosis are called <strong>metamorphoses<\/strong>. Very few vertebrates undergo metamorphosis, but all the amphibians do to some extent.<\/p>\n<div id=\"attachment_3629\" style=\"width: 1034px\" class=\"wp-caption aligncenter\"><img loading=\"lazy\" decoding=\"async\" aria-describedby=\"caption-attachment-3629\" class=\"size-large wp-image-3629\" src=\"https:\/\/s3-us-west-2.amazonaws.com\/courses-images\/wp-content\/uploads\/sites\/2840\/2018\/01\/18221518\/1024px-Greenfrog_life_stages.svg_-1024x765.png\" alt=\"Throughout a frog's life, it adopts several different forms, changing its body through metamorphosis. It starts as an egg, hatches into a tadpole, becomes a frog.\" width=\"1024\" height=\"765\" \/><\/p>\n<p id=\"caption-attachment-3629\" class=\"wp-caption-text\">Figure 1. The life cycle of a green frog.<\/p>\n<\/div>\n<h2>Amphibians<\/h2>\n<p>In typical amphibian development, eggs are laid in water and larvae are adapted to an aquatic lifestyle. Frogs, toads, and newts all hatch from the eggs as larvae with external gills but it will take some time for the amphibians to interact outside with pulmonary respiration. Afterwards, newt larvae start a predatory lifestyle, while tadpoles mostly scrape food off surfaces with their horny tooth ridges.<\/p>\n<p>Metamorphosis in amphibians is regulated by thyroxin concentration in the blood, which stimulates metamorphosis, and prolactin, which counteracts its effect. Specific events are dependent on threshold values for different tissues. Because most embryonic development is outside the parental body, development is subject to many adaptations due to specific ecological circumstances. For this reason tadpoles can have horny ridges for teeth, whiskers, and fins. They also make use of the lateral line organ. After metamorphosis, these organs become redundant and will be resorbed by controlled cell death, called apoptosis. The amount of adaptation to specific ecological circumstances is remarkable, with many discoveries still being made.<\/p>\n<h3>Frogs and toads<\/h3>\n<p>With frogs and toads, the external gills of the newly hatched tadpole are covered with a gill sac after a few days, and lungs are quickly formed. Front legs are formed under the gill sac, and hindlegs are visible a few days later. Following that there is usually a longer stage during which the tadpole lives off a vegetarian diet. Tadpoles use a relatively long, spiral\u2010shaped gut to digest that diet.<\/p>\n<p>Rapid changes in the body can then be observed as the lifestyle of the frog changes completely. The spiral\u2010shaped mouth with horny tooth ridges is resorbed together with the spiral gut. The animal develops a big jaw, and its gills disappear along with its gill sac. Eyes and legs grow quickly, a tongue is formed, and all this is accompanied by associated changes in the neural networks (development of stereoscopic vision, loss of the lateral line system, etc.) All this can happen in about a day, so it is truly a metamorphosis (Figure 2). It is not until a few days later that the tail is reabsorbed, due to the higher thyroxin concentrations required for tail resorption.<\/p>\n<div id=\"attachment_3618\" style=\"width: 1034px\" class=\"wp-caption aligncenter\"><img loading=\"lazy\" decoding=\"async\" aria-describedby=\"caption-attachment-3618\" class=\"wp-image-3618 size-large\" src=\"https:\/\/s3-us-west-2.amazonaws.com\/courses-images\/wp-content\/uploads\/sites\/2840\/2018\/01\/18221521\/RanaTemporariaLarva2-1024x418.jpg\" alt=\"Image a shows a tadpole. Image b shows a frog that still has a tail.\" width=\"1024\" height=\"418\" \/><\/p>\n<p id=\"caption-attachment-3618\" class=\"wp-caption-text\">Figure 2. (a) Just before metamorphosis, only 24 hours are needed to reach the stage in part b. (b) Almost functional common frog with some remains of the gill sac and a not fully developed jaw<\/p>\n<\/div>\n<h3>Salamanders<\/h3>\n<p>Salamander development is highly diverse; some species go through a dramatic reorganization when transitioning from aquatic larvae to terrestrial adults, while others, such as the Axolotl, display paedomorphosis and never develop into terrestrial adults. Within the genus Ambystoma, species have evolved to be paedomorphic several times, and paedomorphosis and complete development can both occur in some species.<a class=\"footnote\" title=\"Laudet, Vincent. 2011. \u201cThe Origins and Evolution of Vertebrate Metamorphosis.\u201d\u00a0Current Biology 21: R726\u2013R737\" id=\"return-footnote-828-2\" href=\"#footnote-828-2\" aria-label=\"Footnote 2\"><sup class=\"footnote\">[2]<\/sup><\/a><\/p>\n<h3>Newts<\/h3>\n<div id=\"attachment_3619\" style=\"width: 360px\" class=\"wp-caption alignright\"><img loading=\"lazy\" decoding=\"async\" aria-describedby=\"caption-attachment-3619\" class=\"wp-image-3619\" src=\"https:\/\/s3-us-west-2.amazonaws.com\/courses-images\/wp-content\/uploads\/sites\/2840\/2018\/01\/18221524\/LarveKamsalamander.jpg\" alt=\"Crested Newt Triturus cristatus larval stage\" width=\"350\" height=\"263\" \/><\/p>\n<p id=\"caption-attachment-3619\" class=\"wp-caption-text\">Figure 3. The large external gills of the crested newt<\/p>\n<\/div>\n<p>In newts, there is no true metamorphosis because newt larvae already feed as predators and continue doing so as adults. Newts&#8217; gills are never covered by a gill sac (Figure 3) and will be resorbed only just before the animal leaves the water. Just as in tadpoles, their lungs are functional early, but newts use them less frequently than tadpoles. Newts often have an aquatic phase in spring and summer, and a land phase in winter. For adaptation to a water phase, prolactin is the required hormone, and for adaptation to the land phase, thyroxin. External gills do not return in subsequent aquatic phases because these are completely absorbed upon leaving the water for the first time.<\/p>\n<h3>Caecilians<\/h3>\n<p>Basal caecilians such as Ichthyophis go through a metamorphosis in which aquatic larva transition into fossorial adults, which involves a loss of the lateral line.<a class=\"footnote\" title=\"Dunker, Nicole, Marvalee H. Wake, Wendy M. Olson. 2000. \u201cEmbryonic and Larval Development in the Caecilian Ichthyophis kohtaoensis (Amphibia, Gymnophiona): A Staging Table\u201d Journal of Morphology 243: 3\u201334\" id=\"return-footnote-828-3\" href=\"#footnote-828-3\" aria-label=\"Footnote 3\"><sup class=\"footnote\">[3]<\/sup><\/a> More recently diverged caecilians (the Teresomata) do not undergo an ontogenetic niche shift of this sort and are in general fossorial throughout their lives. Thus, most caecilians do not undergo an anuran-like metamorphosis.<a class=\"footnote\" title=\"San Mauro, D., Gower, D. J., Oommen, O. V., Wilkinson, M. &amp; Zardoya, R. 2004. &quot;Phylogeny of caecilian amphibians (Gymnophiona) based on complete mitochondrial genomes and nuclear RAG1.&quot;\u00a0Molecular Phylogenetics and Evolution 33: 413\u2013427.\" id=\"return-footnote-828-4\" href=\"#footnote-828-4\" aria-label=\"Footnote 4\"><sup class=\"footnote\">[4]<\/sup><\/a><\/p>\n\n\t\t\t <section class=\"citations-section\" role=\"contentinfo\">\n\t\t\t <h3>Candela Citations<\/h3>\n\t\t\t\t\t <div>\n\t\t\t\t\t\t <div id=\"citation-list-828\">\n\t\t\t\t\t\t\t <div class=\"licensing\"><div class=\"license-attribution-dropdown-subheading\">CC licensed content, Original<\/div><ul class=\"citation-list\"><li>Adaptation and Revision of Metamorphosis. <strong>Authored by<\/strong>: Shelli Carter and Lumen Learning. <strong>Provided by<\/strong>: Lumen Learning. <strong>License<\/strong>: <em><a target=\"_blank\" rel=\"license\" href=\"https:\/\/creativecommons.org\/licenses\/by-sa\/4.0\/\">CC BY-SA: Attribution-ShareAlike<\/a><\/em><\/li><\/ul><div class=\"license-attribution-dropdown-subheading\">CC licensed content, Shared previously<\/div><ul class=\"citation-list\"><li>Metamorphosis. <strong>Provided by<\/strong>: Wikipedia. <strong>Located at<\/strong>: <a target=\"_blank\" href=\"https:\/\/en.wikipedia.org\/wiki\/Metamorphosis\">https:\/\/en.wikipedia.org\/wiki\/Metamorphosis<\/a>. <strong>License<\/strong>: <em><a target=\"_blank\" rel=\"license\" href=\"https:\/\/creativecommons.org\/licenses\/by-sa\/4.0\/\">CC BY-SA: Attribution-ShareAlike<\/a><\/em><\/li><li>Green frog life stages. <strong>Authored by<\/strong>: LadyofHats. <strong>Provided by<\/strong>: Wikipedia. <strong>Located at<\/strong>: <a target=\"_blank\" href=\"https:\/\/commons.wikimedia.org\/wiki\/File:Greenfrog_life_stages.svg\">https:\/\/commons.wikimedia.org\/wiki\/File:Greenfrog_life_stages.svg<\/a>. <strong>License<\/strong>: <em><a target=\"_blank\" rel=\"license\" href=\"https:\/\/creativecommons.org\/about\/cc0\">CC0: No Rights Reserved<\/a><\/em><\/li><\/ul><\/div>\n\t\t\t\t\t\t <\/div>\n\t\t\t\t\t <\/div>\n\t\t\t <\/section><hr class=\"before-footnotes clear\" \/><div class=\"footnotes\"><ol><li id=\"footnote-828-1\">Robert J. Denver.\u00a0<a href=\"http:\/\/www.cell.com\/current-biology\/pdf\/S0960-9822(08)00661-1.pdf\" target=\"_blank\" rel=\"noopener\">Chordate Metamorphosis: Ancient Control by Iodothyronines.<\/a>\u00a0<em>Current Biology<\/em>, 2008, Vol 18 No 13, R567-9. DOI: 10.1016\/j.cub.2008.05.024 <a href=\"#return-footnote-828-1\" class=\"return-footnote\" aria-label=\"Return to footnote 1\">&crarr;<\/a><\/li><li id=\"footnote-828-2\">Laudet, Vincent. 2011. \u201cThe Origins and Evolution of Vertebrate Metamorphosis.\u201d\u00a0<em>Current Biology<\/em> 21: R726\u2013R737 <a href=\"#return-footnote-828-2\" class=\"return-footnote\" aria-label=\"Return to footnote 2\">&crarr;<\/a><\/li><li id=\"footnote-828-3\">Dunker, Nicole, Marvalee H. Wake, Wendy M. Olson. 2000. \u201cEmbryonic and Larval Development in the Caecilian Ichthyophis kohtaoensis (Amphibia, Gymnophiona): A Staging Table\u201d <em>Journal of Morphology<\/em> 243: 3\u201334 <a href=\"#return-footnote-828-3\" class=\"return-footnote\" aria-label=\"Return to footnote 3\">&crarr;<\/a><\/li><li id=\"footnote-828-4\">San Mauro, D., Gower, D. J., Oommen, O. V., Wilkinson, M. &amp; Zardoya, R. 2004. \"Phylogeny of caecilian amphibians (Gymnophiona) based on complete mitochondrial genomes and nuclear RAG1.\"\u00a0<em>Molecular Phylogenetics and Evolution<\/em> 33: 413\u2013427. <a href=\"#return-footnote-828-4\" class=\"return-footnote\" aria-label=\"Return to footnote 4\">&crarr;<\/a><\/li><\/ol><\/div>","protected":false},"author":17,"menu_order":11,"template":"","meta":{"_candela_citation":"[{\"type\":\"original\",\"description\":\"Adaptation and Revision of Metamorphosis\",\"author\":\"Shelli Carter and Lumen Learning\",\"organization\":\"Lumen Learning\",\"url\":\"\",\"project\":\"\",\"license\":\"cc-by-sa\",\"license_terms\":\"\"},{\"type\":\"cc\",\"description\":\"Metamorphosis\",\"author\":\"\",\"organization\":\"Wikipedia\",\"url\":\"https:\/\/en.wikipedia.org\/wiki\/Metamorphosis\",\"project\":\"\",\"license\":\"cc-by-sa\",\"license_terms\":\"\"},{\"type\":\"cc\",\"description\":\"Green frog life stages\",\"author\":\"LadyofHats\",\"organization\":\"Wikipedia\",\"url\":\"https:\/\/commons.wikimedia.org\/wiki\/File:Greenfrog_life_stages.svg\",\"project\":\"\",\"license\":\"cc0\",\"license_terms\":\"\"}]","CANDELA_OUTCOMES_GUID":"14aac4a9-ee86-40ab-b2da-6cadb08034f9, 49f5869e-749f-483f-8be3-8b81512fb73b","pb_show_title":"on","pb_short_title":"","pb_subtitle":"","pb_authors":[],"pb_section_license":""},"chapter-type":[],"contributor":[],"license":[],"class_list":["post-828","chapter","type-chapter","status-publish","hentry"],"part":798,"_links":{"self":[{"href":"https:\/\/courses.lumenlearning.com\/atd-herkimer-biologyfundamentals1\/wp-json\/pressbooks\/v2\/chapters\/828","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/courses.lumenlearning.com\/atd-herkimer-biologyfundamentals1\/wp-json\/pressbooks\/v2\/chapters"}],"about":[{"href":"https:\/\/courses.lumenlearning.com\/atd-herkimer-biologyfundamentals1\/wp-json\/wp\/v2\/types\/chapter"}],"author":[{"embeddable":true,"href":"https:\/\/courses.lumenlearning.com\/atd-herkimer-biologyfundamentals1\/wp-json\/wp\/v2\/users\/17"}],"version-history":[{"count":4,"href":"https:\/\/courses.lumenlearning.com\/atd-herkimer-biologyfundamentals1\/wp-json\/pressbooks\/v2\/chapters\/828\/revisions"}],"predecessor-version":[{"id":1890,"href":"https:\/\/courses.lumenlearning.com\/atd-herkimer-biologyfundamentals1\/wp-json\/pressbooks\/v2\/chapters\/828\/revisions\/1890"}],"part":[{"href":"https:\/\/courses.lumenlearning.com\/atd-herkimer-biologyfundamentals1\/wp-json\/pressbooks\/v2\/parts\/798"}],"metadata":[{"href":"https:\/\/courses.lumenlearning.com\/atd-herkimer-biologyfundamentals1\/wp-json\/pressbooks\/v2\/chapters\/828\/metadata\/"}],"wp:attachment":[{"href":"https:\/\/courses.lumenlearning.com\/atd-herkimer-biologyfundamentals1\/wp-json\/wp\/v2\/media?parent=828"}],"wp:term":[{"taxonomy":"chapter-type","embeddable":true,"href":"https:\/\/courses.lumenlearning.com\/atd-herkimer-biologyfundamentals1\/wp-json\/pressbooks\/v2\/chapter-type?post=828"},{"taxonomy":"contributor","embeddable":true,"href":"https:\/\/courses.lumenlearning.com\/atd-herkimer-biologyfundamentals1\/wp-json\/wp\/v2\/contributor?post=828"},{"taxonomy":"license","embeddable":true,"href":"https:\/\/courses.lumenlearning.com\/atd-herkimer-biologyfundamentals1\/wp-json\/wp\/v2\/license?post=828"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}