{"id":566,"date":"2021-08-25T10:00:00","date_gmt":"2021-08-25T11:00:00","guid":{"rendered":"https:\/\/whalewatchingazores.com\/blog\/2018\/03\/30\/how-we-cataloged-rissos-dolphins-in\/"},"modified":"2021-08-30T15:43:44","modified_gmt":"2021-08-30T16:43:44","slug":"how-we-cataloged-rissos-dolphins-in","status":"publish","type":"post","link":"https:\/\/whalewatchingazores.com\/blog\/how-we-cataloged-rissos-dolphins-in\/","title":{"rendered":"Learn more about Risso’s Dolphins and their marks"},"content":{"rendered":"\n

How we cataloged Risso\u2019s dolphins in Azores and why they have mark types more than other species<\/h2>\n\n\n\n

Risso\u2019s dolphins (Grampus griseus<\/em>)<\/h2>\n\n\n\n
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The Risso\u2019s dolphin\u00a0(Grampus griseus<\/em>) is a resident\u00a0species in the Azores. They can measure up to 4 meters in length and weigh over\u00a0500 kg.\u00a0 In this species the length of females tends to be roughly the same as\u00a0males, contrary to the majority dolphin species in which males are larger than\u00a0females.<\/p>\n\n\n\n

 <\/p>\n\n\n\n

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This species normally occurs in oceanic waters (400 m \u2013 1000 m depth) and in temperate and tropical areas. They have a blunt head without a defined snout, which is an evolutionary morphological adaptation that facilitates their predation on squids and small cephalopods.<\/p>\n\n\n\n

They have the peculiarity of being born with a dark colouration and acquiring marks throughout their lifetime, thus becoming white with age.<\/p>\n\n\n\n

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Age classes using the scarification percentage created by Karin Hartman (Hartman, K.L., Wittich, A., Cai, J.J., van der Meulen, F. and Azevedo, J. M.N. (2016). Estimating the age of Risso\u2019s dolphins (Grampus griseus<\/em>) based on skin appearance. Journal of Mammology. 97 (2): 490-502.)\u00a0<\/strong><\/span><\/figcaption><\/figure>\n\n\n\n
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Mark types causes examples discovered by Karin Hartman (Hartman, K.L., Wittich., A. and Azevedo, J.M.N. 2012. Show me your body and I tell you how old you are: A non-invasive method to define 6 life history- classes in Risso\u2019s dolphins (Grampus griseus<\/em>) using an identified trial population in the Atlantic. In: European Cetacean Society Special Publication Series 54: 69-88.)<\/span><\/figcaption><\/figure>\n\n\n\n

These marks can be caused by suction cups that squids have on their tentacles and by other Risso\u2019s dolphins, since they can sometimes be more aggressive while socializing.<\/p>\n\n\n\n

The photo ID is a technique used to identify individuals through a photo of their dorsal fin that can changes as the animal ages, acquiring marks and cuts. Since each dorsal fin is different then it works as a fingerprint and allows to create a individuals catalog.<\/p>\n\n\n\n

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In Futurismo\u2019s catalog are cataloged 570 individuals and 1100 photos taken since 2010. Here are some examples of some individuals who have many differences over the years:<\/p>\n\n\n\n

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Unfortunately, this species suffers greatly in terms of captivity, mostly in Asia. In Japan, hundreds of dolphins are caught every year. Those with better morphological conditions are trained for entertainment shows and the rest are killed. Do not contribute to these captive centers, it is much better to see the animals in their natural habitat. Do not buy a ticket<\/strong>!<\/p>\n\n\n\n

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Bibliography<\/strong><\/p>\n\n\n\n

Hartman, K.L., Visser, F. and Hendriks A. J. E. 2008. Social structure of Risso’s dolphins (Grampus griseus<\/em>) at the Azores: a stratified community based on highly associated social units. Canadian Journal of Zoology 86(4): 294-306, April.<\/p>\n\n\n\n

Hartman, K.L., Fernandez, M. and Azevedo J.M.N. (2014). Spatial segregation of calving and nursing Risso’s dolphins (Grampus griseus<\/em>) in the Azores, and its conservation implications. Marine Biology, 161(6): 1419-1428.<\/p>\n\n\n\n

Hartman, K.L., Fernandez, M., Wittich, A. and Azevedo, J.M.N. (2015b). Sex differences in residency patterns of Risso\u2019s dolphins (Grampus griseus<\/em>) in the Azores: causes and management implications. Marine Mammal Science, 31(3): 1153\u20131167.<\/p>\n\n\n\n

Hartman, K.L., Wittich, A., Cai, J.J., van der Meulen, F. and Azevedo, J. M.N. (2016). Estimating the age of Risso\u2019s dolphins (Grampus griseus<\/em>) based on skin appearance. Journal of Mammology. 97 (2): 490-502.<\/p>\n\n\n\n

Wursig, B. and Jefferson, T.A., (1990). Methods of photo-identification for small cetaceans. Report to the International Whaling Commission, Special Issue, 12: 43-52.<\/p>\n\n\n\n

Written by Rafael Martins<\/em><\/p>\n","protected":false},"excerpt":{"rendered":"How we cataloged Risso\u2019s dolphins in Azores and why they have mark types more than other species Risso\u2019s…\n","protected":false},"author":2,"featured_media":49733,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":[],"categories":[316],"tags":[8,93,4,214,35],"yoast_head":"\nLearn more about Risso's Dolphins and their marks - Azores Whales<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/whalewatchingazores.com\/blog\/how-we-cataloged-rissos-dolphins-in\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Learn more about Risso's Dolphins and their marks - Azores Whales\" \/>\n<meta property=\"og:description\" content=\"How we cataloged Risso\u2019s dolphins in Azores and why they have mark types more than other species Risso\u2019s…\" \/>\n<meta property=\"og:url\" content=\"https:\/\/whalewatchingazores.com\/blog\/how-we-cataloged-rissos-dolphins-in\/\" \/>\n<meta property=\"og:site_name\" content=\"Azores Whales\" \/>\n<meta property=\"article:published_time\" content=\"2021-08-25T11:00:00+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2021-08-30T16:43:44+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/whalewatchingazores.com\/blog\/wp-content\/uploads\/2018\/03\/risso-cria.a76ef047d8d24c03823acdf41c4ee7c8.jpg\" \/>\n\t<meta property=\"og:image:width\" content=\"1024\" \/>\n\t<meta property=\"og:image:height\" content=\"682\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"Est. reading time\">\n\t<meta name=\"twitter:data1\" content=\"5 minutes\">\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"WebSite\",\"@id\":\"https:\/\/whalewatchingazores.com\/blog\/#website\",\"url\":\"https:\/\/whalewatchingazores.com\/blog\/\",\"name\":\"Azores Whales\",\"description\":\"Azores Whale Watching Blog\",\"potentialAction\":[{\"@type\":\"SearchAction\",\"target\":\"https:\/\/whalewatchingazores.com\/blog\/?s={search_term_string}\",\"query-input\":\"required name=search_term_string\"}],\"inLanguage\":\"en-US\"},{\"@type\":\"ImageObject\",\"@id\":\"https:\/\/whalewatchingazores.com\/blog\/how-we-cataloged-rissos-dolphins-in\/#primaryimage\",\"inLanguage\":\"en-US\",\"url\":\"https:\/\/whalewatchingazores.com\/blog\/wp-content\/uploads\/2018\/03\/risso-cria.a76ef047d8d24c03823acdf41c4ee7c8.jpg\",\"contentUrl\":\"https:\/\/whalewatchingazores.com\/blog\/wp-content\/uploads\/2018\/03\/risso-cria.a76ef047d8d24c03823acdf41c4ee7c8.jpg\",\"width\":1024,\"height\":682,\"caption\":\"risso's dolphins azores\"},{\"@type\":\"WebPage\",\"@id\":\"https:\/\/whalewatchingazores.com\/blog\/how-we-cataloged-rissos-dolphins-in\/#webpage\",\"url\":\"https:\/\/whalewatchingazores.com\/blog\/how-we-cataloged-rissos-dolphins-in\/\",\"name\":\"Learn more about Risso's Dolphins and their marks - 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