{"id":25670,"date":"2018-12-21T00:17:23","date_gmt":"2018-12-20T23:17:23","guid":{"rendered":"http:\/\/www.ocean4future.org\/?p=25670"},"modified":"2023-10-01T19:23:04","modified_gmt":"2023-10-01T17:23:04","slug":"sullimportanza-di-comprendere-la-fisiologia-nella-stima-dellenergetica-nei-cetacei-lars-p-folkow-arnoldus-schytte-blix","status":"publish","type":"post","link":"https:\/\/www.ocean4future.org\/savetheocean\/archives\/25670","title":{"rendered":"Sull&#8217;importanza di comprendere la fisiologia nella stima dell&#8217;energetica nei cetacei Lars P. Folkow, Arnoldus Schytte Blix"},"content":{"rendered":"<span class=\"span-reading-time rt-reading-time\" style=\"display: block;\"><span class=\"rt-label rt-prefix\">tempo di lettura: <\/span> <span class=\"rt-time\"> 5<\/span> <span class=\"rt-label rt-postfix\">minuti<\/span><\/span><p><span style=\"color: #ffffff;\">.<\/span><br \/>\n<a class=\"maxbutton-11 maxbutton maxbutton-livello-di-comprensione\" href=\"javascript:void(0);\"><span class='mb-text'>livello difficile<\/span><\/a><br \/>\n<span style=\"color: #ffffff;\">.<\/span><br \/>\n<strong><span style=\"color: #008000;\">ARGOMENTO: BIOLOGIA MARINA<\/span><\/strong><br \/>\n<strong><span style=\"color: #008000;\">PERIODO: ODIERNO<\/span><\/strong><br \/>\n<strong><span style=\"color: #008000;\">AREA: na<\/span><\/strong><br \/>\nparole chiave: balene, energetica, fisiologia<\/p>\n<p>&nbsp;<\/p>\n<p style=\"text-align: justify;\">Abbiamo, con grande interesse, esaminato lo studio intitolato &#8220;<strong><span style=\"color: #008000;\"><a style=\"color: #008000;\" href=\"http:\/\/bio.biologists.org\/content\/5\/4\/436?ijkey=a72e66cda8a3399964a58cc5ed055aaccd4955ad&amp;keytype2=tf_ipsecsha\">Estimating energetics in cetaceans from respiratory frequency: why we need to understand physiology<\/a><\/span><\/strong>&#8221; di Fahlman et al. (2016), e abbiamo apprezzato la loro enfasi sulla necessit\u00e0 di comprendere la fisiologia quando vengono stimati i tassi metabolici di campo (FMR) dei cetacei. In questo documento, Fahlman et al. hanno utilizzato i dati da loro raccolti su delfini bottlenose in cattivit\u00e0 (<em><strong><span style=\"color: #008000;\">Tursiops truncatus<\/span><\/strong><\/em>), sia a riposo che dopo un periodo di nuoto in superficie, per testare la validit\u00e0 dell&#8217;uso di variabili respiratorie di cetacei misticeti di grandi dimensioni che vivono liberi per la stima del loro FMR ( Field Metabolic Rates).&nbsp;<\/p>\n<figure id=\"attachment_25673\" aria-describedby=\"caption-attachment-25673\" style=\"width: 1000px\" class=\"wp-caption alignnone\"><img decoding=\"async\" class=\"wp-image-25673 size-full\" src=\"https:\/\/www.ocean4future.org\/savetheocean\/wp-content\/uploads\/2018\/12\/Balaenoptera-musculus.jpg\" alt=\"\" width=\"1000\" height=\"667\" srcset=\"https:\/\/www.ocean4future.org\/savetheocean\/wp-content\/uploads\/2018\/12\/Balaenoptera-musculus.jpg 1000w, https:\/\/www.ocean4future.org\/savetheocean\/wp-content\/uploads\/2018\/12\/Balaenoptera-musculus-300x200.jpg 300w, https:\/\/www.ocean4future.org\/savetheocean\/wp-content\/uploads\/2018\/12\/Balaenoptera-musculus-768x512.jpg 768w\" sizes=\"(max-width: 1000px) 100vw, 1000px\" \/><figcaption id=\"caption-attachment-25673\" class=\"wp-caption-text\"><span style=\"font-size: 12pt;\"><strong><span style=\"color: #008000;\">Balaenoptera musculus, acque Sri Lanka<\/span><\/strong><\/span><\/figcaption><\/figure>\n<p style=\"text-align: justify;\">Questo approccio fu usato per la prima volta nella <strong><span style=\"color: #008000;\">balena blu<\/span><\/strong> <strong>(<span style=\"color: #008000;\">Balaenoptera musculus<\/span>)<\/strong> dal premio Nobel August Krogh, (Krogh, 1934), e finora \u00e8 stato l&#8217;unico modo per ottenere stime utili del dispendio energetico nei grandi cetacei in libert\u00e0. Il metodo sfrutta il fatto che i mammiferi marini sono di fatto dei subacquei che trattengono il respiro e che traggono vantaggio dall&#8217;ottimizzare il loro tempo sott&#8217;acqua conducendo uno scambio respiratorio durante brevi periodi di superficie, durante i quali vengono scambiati rapidamente grandi volumi d&#8217;aria (Blix e Folkow, 1995).<\/p>\n<p><strong><span style=\"color: #008000;\">L&#8217;approccio si basa sull&#8217;equazione:<\/span><\/strong><\/p>\n<p style=\"text-align: justify;\"><img decoding=\"async\" class=\"alignnone wp-image-25672 size-full\" src=\"https:\/\/www.ocean4future.org\/savetheocean\/wp-content\/uploads\/2018\/12\/formula-vo2-misticeti.png\" alt=\"\" width=\"269\" height=\"74\"><br \/>\ndove <span style=\"color: #008000;\">VO2<\/span> \u00e8 il tasso di assorbimento di ossigeno (l min-1); <span style=\"color: #008000;\">VT<\/span> \u00e8 il volume corrente (l breath-1); <span style=\"color: #008000;\">\u0394O2<\/span> \u00e8 la differenza nella concentrazione di ossigeno tra inspirata (O2 in) ed aria espirata (O2 ex); \u0394O2 = O2in-O2ex (%); e <span style=\"color: #008000;\">f<\/span>&nbsp; \u00e8 la frequenza respiratoria (respiro min-1).<\/p>\n<p style=\"text-align: justify;\">Nella loro analisi, Fahlman et al. hanno valutato tre metodi, tutti basati su Eqn 1 (metodi A, B e C).<\/p>\n<p style=\"text-align: justify;\">In particolare, nel metodo A sono stati usati i dati di Armstrong e Siegfried (1991) e Dolphin (1987), e in B i nostri dati (Blix e Folkow, 1995), in entrambi i casi per stimare l&#8217;FMR nei grandi misticeti; mentre nel metodo C, Fahlman et al. hanno usato i dati dai loro delfini. In tutti i casi i risultati sono stati confrontati con le misurazioni dirette di Fahlman et al. del VO2 negli stessi delfini. Cos\u00ec facendo, non sorprende che il metodo C abbia funzionato bene, mentre i metodi A e B hanno dimostrato di sovrastimare il valore &#8220;vero&#8221; di circa il 200-500%. In estrema sintesi questi sono i risultati che, anche se con qualche riserva, Fahlman et al. offrono sulla validit\u00e0 del loro confronto. Tuttavia \u00e8 necessario sottolineare che Fahlman et al. hanno condotto i loro raffronti attraverso diversi livelli di attivit\u00e0, subordine e pi\u00f9 di 20 ordini di grandezza rispetto alla massa corporea.<\/p>\n<figure id=\"attachment_25674\" aria-describedby=\"caption-attachment-25674\" style=\"width: 850px\" class=\"wp-caption alignnone\"><img decoding=\"async\" class=\"wp-image-25674\" src=\"https:\/\/www.ocean4future.org\/savetheocean\/wp-content\/uploads\/2018\/12\/bottlenose-dolphin.png\" alt=\"\" width=\"850\" height=\"517\" srcset=\"https:\/\/www.ocean4future.org\/savetheocean\/wp-content\/uploads\/2018\/12\/bottlenose-dolphin.png 472w, https:\/\/www.ocean4future.org\/savetheocean\/wp-content\/uploads\/2018\/12\/bottlenose-dolphin-300x182.png 300w\" sizes=\"(max-width: 850px) 100vw, 850px\" \/><figcaption id=\"caption-attachment-25674\" class=\"wp-caption-text\"><span style=\"font-size: 12pt;\"><strong><span style=\"color: #008000;\">bottlenose dolphin <\/span><\/strong><\/span><\/figcaption><\/figure>\n<p style=\"text-align: justify;\">In questo modo, hanno scelto di applicare relazioni allometriche empiriche per la predizione dei volumi polmonari invece di usare i valori misurati sui loro delfini. Il fatto che i risultati dei diversi metodi differiscano sostanzialmente non dovrebbe quindi sorprendere pi\u00f9 di quanto l&#8217;uso della formula di Du Bois, usata per la stima della superficie nell&#8217;uomo (Du Bois e Du Bois, 1916) si dimostrerebbe inadeguata per il calcolo della superficie, per esempio, nelle giraffe. Inoltre, se Fahlman et al. avessero stimato i volumi polmonari dei loro delfini usando l&#8217;equazione empirica di Wahrenbrock et alii (1974) per le balene grigie (<span style=\"color: #008000;\">Eschrichtius robustus<\/span>), avrebbero ottenuto valori negativi.<\/p>\n<p style=\"text-align: justify;\">Per illustrare ulteriormente il punto, \u00e8 stata testata la validit\u00e0 del Metodo C di Fahlman et al., usando i dati esistenti per un grande misticeto. Wahrenbrock et al. (1974) hanno misurato che un giovane di balena grigia di 4000 kg a riposo ha un VO2 corrispondente a circa 2 \u00d7 il metabolismo basale di Kleiber (BMR), cio\u00e8 come previsto per qualsiasi mammifero immaturo e in crescita (Kleiber, 1961).&nbsp;<\/p>\n<p><img decoding=\"async\" class=\"size-full wp-image-25675 alignnone\" src=\"https:\/\/www.ocean4future.org\/savetheocean\/wp-content\/uploads\/2018\/12\/table-2.png\" alt=\"\" width=\"825\" height=\"365\" srcset=\"https:\/\/www.ocean4future.org\/savetheocean\/wp-content\/uploads\/2018\/12\/table-2.png 825w, https:\/\/www.ocean4future.org\/savetheocean\/wp-content\/uploads\/2018\/12\/table-2-300x133.png 300w, https:\/\/www.ocean4future.org\/savetheocean\/wp-content\/uploads\/2018\/12\/table-2-768x340.png 768w\" sizes=\"(max-width: 825px) 100vw, 825px\" \/><\/p>\n<p style=\"text-align: justify;\">Usando il Metodo C con i dati di Fahlman et al. per VT a riposo (32% della capacit\u00e0 polmonare totale) e \u0394O2 (4,94%), e Wahrenbrock e alii (1974) avendo misurato i valori del volume polmonare (236 litri) e la frequenza respiratoria a riposo ( ~1 breath min-1) per un vitello di 4000 kg, si ottiene un VO2 di 3,7 litri min-1, che \u00e8 inferiore al 35% del VO2 di 10,7 litri min-1 misurato.<\/p>\n<figure id=\"attachment_25676\" aria-describedby=\"caption-attachment-25676\" style=\"width: 2100px\" class=\"wp-caption alignnone\"><img decoding=\"async\" class=\"wp-image-25676 size-full\" src=\"https:\/\/www.ocean4future.org\/savetheocean\/wp-content\/uploads\/2018\/12\/hon-bcurnock-matt1-dwarf-minke-whale-111.jpg\" alt=\"\" width=\"2100\" height=\"1285\" srcset=\"https:\/\/www.ocean4future.org\/savetheocean\/wp-content\/uploads\/2018\/12\/hon-bcurnock-matt1-dwarf-minke-whale-111.jpg 2100w, https:\/\/www.ocean4future.org\/savetheocean\/wp-content\/uploads\/2018\/12\/hon-bcurnock-matt1-dwarf-minke-whale-111-300x184.jpg 300w, https:\/\/www.ocean4future.org\/savetheocean\/wp-content\/uploads\/2018\/12\/hon-bcurnock-matt1-dwarf-minke-whale-111-768x470.jpg 768w, https:\/\/www.ocean4future.org\/savetheocean\/wp-content\/uploads\/2018\/12\/hon-bcurnock-matt1-dwarf-minke-whale-111-1024x627.jpg 1024w, https:\/\/www.ocean4future.org\/savetheocean\/wp-content\/uploads\/2018\/12\/hon-bcurnock-matt1-dwarf-minke-whale-111-660x405.jpg 660w, https:\/\/www.ocean4future.org\/savetheocean\/wp-content\/uploads\/2018\/12\/hon-bcurnock-matt1-dwarf-minke-whale-111-1200x734.jpg 1200w\" sizes=\"(max-width: 2100px) 100vw, 2100px\" \/><figcaption id=\"caption-attachment-25676\" class=\"wp-caption-text\"><span style=\"font-size: 12pt;\"><strong><span style=\"color: #008000;\">Balaenoptera acutorostrata<\/span><\/strong><\/span><\/figcaption><\/figure>\n<p style=\"text-align: justify;\">Se applichiamo il metodo C di Fahlman ai dati (Blix and Folkow, 1995), otteniamo che una balena minke (<span style=\"color: #008000;\">Balaenoptera acutorostrata<\/span>) sarebbe in grado di nuotare a 2-3 ms-1 in un FMR, valore che \u00e8 del 20% inferiore al BMR di Kleiber nei mammiferi in generale (Kleiber, 1961), o per buona misura, ad un FMR simile (in W kg-0,75) come nel bradipo tridattilo (<span style=\"color: #008000;\">Bradypus variegatus)<\/span> (Nagy e Montgomery, 1980).<\/p>\n<p style=\"text-align: justify;\">In sintesi gli autori ritengono che&nbsp; \u201d<strong>O<em><span style=\"color: #008000;\">ne would assume that, with proper physiological insight, the extraordinarily large discrepancies between the outcomes of the different methods would have inspired similar exercises, and that Fahlman et al.&#8217;s paper, in consequence, would not have been published in its present form<\/span><\/em>.<\/strong>&#8220;<\/p>\n<p style=\"text-align: justify;\"><a href=\"http:\/\/bio.biologists.org\/content\/6\/2\/306\">Link all\u2019articolo originale<\/a> da Biology Open 2017 6: 306 doi: 10.1242 \/ bio.023929<br \/>\n<span style=\"color: #ffffff;\">.<\/span><\/p>\n<p><span style=\"font-size: 18pt;\"><strong><span style=\"color: #008000;\">Riferimenti<\/span><\/strong><\/span><br \/>\n<span style=\"font-size: 10pt;\">&#8211; Armstrong, A. J. and Siegfried, W. R. (1991). Consumption of Antarctic krill by minke whales. Antarctic Sci. 3, 13-18. doi:10.1017\/S0954102091000044 CrossRefGoogle Scholar<\/span><\/p>\n<p><span style=\"font-size: 10pt;\">&#8211; Blix, A. S. and Folkow, L. P. (1995). Daily energy expenditure in free living minke whales. Acta Physiol. Scand. 153, 61-66. doi:10.1111\/j.1748-1716.1995.tb09834.x CrossRefPubMedGoogle Scholar<\/span><\/p>\n<p><span style=\"font-size: 10pt;\">&#8211; Dolphin, W. F. (1987). Dive behavior and estimated energy expenditure of foraging humpback whales in southeast Alaska. Can. J. Zool. 65, 354-362. doi:10.1139\/z87-055CrossRefGoogle Scholar<\/span><\/p>\n<p><span style=\"font-size: 10pt;\">&#8211; Du Bois, D. and Du Bois, E. F. (1916). A formula to estimate the approximate surface area if height and weight be known. Arch. Intern. Med. 17, 863-871. doi:10.1001\/archinte.1916.00080130010002 CrossRefPubMedGoogle Scholar<\/span><\/p>\n<p><span style=\"font-size: 10pt;\">&#8211; Fahlman, A., van der Hoop, J., Moore, M. J., Levine, G., Rocho-Levine, J. and Brodsky, M. (2016). Estimating energetics in cetaceans from respiratory frequency: why we need to understand physiology. Biol. Open 5, 436-442. doi:10.1242\/bio.017251 Abstract\/FREE Full TextGoogle Scholar<\/span><\/p>\n<p><span style=\"font-size: 10pt;\">&#8211; Kleiber, M. (1961). The Fire of Life \u2013 An Introduction to Animal Energetics. New York: John Wiley &amp; Sons, Inc..Google Scholar<\/span><\/p>\n<p><span style=\"font-size: 10pt;\">&#8211; Krogh, A. (1934). Physiology of the blue whale. Nature 133, 635-637. doi:10.1038\/133635a0CrossRefGoogle Scholar<\/span><\/p>\n<p><span style=\"font-size: 10pt;\">&#8211; Nagy, K. A. and Montgomery, G. G. (1980). Field metabolic rate, water flux, and food consumption in three-toed sloths (Bradypus variegatus). J. Mammal. 61, 465-472. doi:10.2307\/1379840 Abstract\/FREE Full TextGoogle Scholar<\/span><\/p>\n<p><span style=\"font-size: 10pt;\">&#8211; Wahrenbrock, E. A., Maruschak, G. F., Elsner, R. and Kenny, D. W. (1974). Respiration and metabolism in two baleen whale calves. Mar. Fish. Rev. 36, 3-8.Google Scholar<\/span><\/p>\n<p>&nbsp;<\/p>\n<p><a class=\"maxbutton-27 maxbutton maxbutton-un-regalo-per-te\" href=\"https:\/\/www.primevideo.com\/offers\/ref=atv_nb_lcl_it_IT?tag=amazon0e150-21 Italia\"><span class='mb-text'>Una sorpresa per te su Amazon Music unlimited<\/span><\/a>&nbsp; &nbsp;<a class=\"maxbutton-28 maxbutton maxbutton-amazon-prime\" title=\"Scopri i vantaggi di Amazon Prime\" href=\"javascript:void(0);\"><span class='mb-text'>Scopri i vantaggi di Amazon Prime<\/span><\/a><\/p>\n<p>&nbsp;<\/p>\n<p style=\"text-align: justify;\">Alcune delle foto presenti in questo blog possono essere state prese dal web, citandone ove possibile gli autori e\/o le fonti. Se qualcuno desiderasse specificarne l\u2019autore o rimuoverle, pu\u00f2 scrivere a infoocean4future@gmail.com e provvederemo immediatamente alla correzione dell\u2019articolo<br \/>\n<span style=\"color: #ffffff;\">,<\/span><\/p>\n<p style=\"text-align: justify;\"><a class=\"maxbutton-3 maxbutton maxbutton-pagina-principale\" target=\"_blank\" title=\"tooltip\" rel=\"nofollow noopener\" href=\"http:\/\/www.ocean4future.org\"><span class='mb-text'>PAGINA PRINCIPALE<\/span><\/a><\/p>\n<p><span style=\"color: #ffffff;\">&#8211;<\/span><\/p>\n<p style=\"text-align: justify;\"><span style=\"font-size: 18pt;\"><strong><span style=\"color: #008000;\">Footnotes<\/span><\/strong><\/span><br \/>\n<span style=\"font-size: 10pt;\">The authors declare no competing or financial interests. \u00a9 2017. Published by The Company of Biologists Ltd http:\/\/creativecommons.org\/licenses\/by\/3.0. This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http:\/\/creativecommons.org\/licenses\/by\/3.0), which permits unrestricted use, distribution and reproduction in any medium provided that the original work is properly attributed.<\/span><\/p>\n","protected":false},"excerpt":{"rendered":"<p><span class=\"span-reading-time rt-reading-time\" style=\"display: block;\"><span class=\"rt-label rt-prefix\">tempo di lettura: <\/span> <span class=\"rt-time\"> 5<\/span> <span class=\"rt-label rt-postfix\">minuti<\/span><\/span>. . ARGOMENTO: BIOLOGIA MARINA PERIODO: ODIERNO AREA: na parole chiave: balene, energetica, fisiologia &nbsp; Abbiamo, con grande interesse, esaminato lo studio intitolato &#8220;Estimating energetics in cetaceans from respiratory frequency: why we need to understand physiology&#8221; di Fahlman et al. (2016), e abbiamo apprezzato la loro enfasi sulla necessit\u00e0 di comprendere la fisiologia quando vengono [&hellip;]<\/p>\n","protected":false},"author":2398,"featured_media":25678,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"_monsterinsights_skip_tracking":false,"_monsterinsights_sitenote_active":false,"_monsterinsights_sitenote_note":"","_monsterinsights_sitenote_category":0,"footnotes":""},"categories":[13],"tags":[1526,1098],"class_list":["post-25670","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-biologia-marina","tag-cetacei","tag-fisiologia"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.2 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Sull&#039;importanza di comprendere la fisiologia nella stima dell&#039;energetica nei cetacei Lars P. Folkow, Arnoldus Schytte Blix &#8226; OCEAN4FUTURE autore<\/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:\/\/www.ocean4future.org\/savetheocean\/archives\/25670\" \/>\n<meta property=\"og:locale\" content=\"it_IT\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Sull&#039;importanza di comprendere la fisiologia nella stima dell&#039;energetica nei cetacei Lars P. Folkow, Arnoldus Schytte Blix &#8226; OCEAN4FUTURE autore\" \/>\n<meta property=\"og:description\" content=\"tempo di lettura:  5 minuti. . ARGOMENTO: BIOLOGIA MARINA PERIODO: ODIERNO AREA: na parole chiave: balene, energetica, fisiologia &nbsp; Abbiamo, con grande interesse, esaminato lo studio intitolato &#8220;Estimating energetics in cetaceans from respiratory frequency: why we need to understand physiology&#8221; di Fahlman et al. 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