{"id":3857,"date":"2025-03-18T10:50:43","date_gmt":"2025-03-18T10:50:43","guid":{"rendered":"http:\/\/www.lagunadinora.it\/sharks-and-tunas-in-sardinia\/"},"modified":"2025-03-24T12:20:46","modified_gmt":"2025-03-24T12:20:46","slug":"sharks-and-tunas-in-sardinia","status":"publish","type":"post","link":"https:\/\/www.lagunadinora.it\/en\/sharks-and-tunas-in-sardinia\/","title":{"rendered":"Sharks and Tunas in Sardinia"},"content":{"rendered":"<p>[et_pb_section fb_built=&#8221;1&#8243; custom_padding_last_edited=&#8221;on|phone&#8221; _builder_version=&#8221;4.27.4&#8243; _module_preset=&#8221;default&#8221; background_color=&#8221;#00529C&#8221; custom_padding=&#8221;4em||6em||false|false&#8221; custom_padding_tablet=&#8221;4em||6em||false|false&#8221; custom_padding_phone=&#8221;1em||3em||false|false&#8221; da_disable_devices=&#8221;off|off|off&#8221; global_colors_info=&#8221;{}&#8221; da_is_popup=&#8221;off&#8221; da_exit_intent=&#8221;off&#8221; da_has_close=&#8221;on&#8221; da_alt_close=&#8221;off&#8221; da_dark_close=&#8221;off&#8221; da_not_modal=&#8221;on&#8221; da_is_singular=&#8221;off&#8221; da_with_loader=&#8221;off&#8221; da_has_shadow=&#8221;on&#8221;][et_pb_row _builder_version=&#8221;4.27.4&#8243; _module_preset=&#8221;default&#8221; width=&#8221;90%&#8221; max_width=&#8221;90%&#8221; custom_margin=&#8221;||0px||false|false&#8221; custom_padding=&#8221;||0px||false|false&#8221; global_colors_info=&#8221;{}&#8221;][et_pb_column type=&#8221;4_4&#8243; _builder_version=&#8221;4.27.4&#8243; _module_preset=&#8221;default&#8221; global_colors_info=&#8221;{}&#8221;][et_pb_text _builder_version=&#8221;4.27.4&#8243; _dynamic_attributes=&#8221;content&#8221; _module_preset=&#8221;default&#8221; text_font=&#8221;&#8211;et_global_body_font|||on|||||&#8221; text_text_color=&#8221;#57B8DF&#8221; text_font_size=&#8221;1.5rem&#8221; text_line_height=&#8221;46px&#8221; header_4_font=&#8221;&#8211;et_global_heading_font||||||||&#8221; header_4_text_color=&#8221;#57B8DF&#8221; header_4_font_size=&#8221;1.5rem&#8221; header_4_line_height=&#8221;46px&#8221; text_font_size_tablet=&#8221;1.5rem&#8221; text_font_size_phone=&#8221;1rem&#8221; text_font_size_last_edited=&#8221;on|phone&#8221; text_line_height_tablet=&#8221;46px&#8221; text_line_height_phone=&#8221;28px&#8221; text_line_height_last_edited=&#8221;on|phone&#8221; global_colors_info=&#8221;{}&#8221;]@ET-DC@eyJkeW5hbWljIjp0cnVlLCJjb250ZW50IjoicG9zdF9jYXRlZ29yaWVzIiwic2V0dGluZ3MiOnsiYmVmb3JlIjoiIiwiYWZ0ZXIiOiIiLCJsaW5rX3RvX3Rlcm1fcGFnZSI6Im9mZiIsInNlcGFyYXRvciI6IiB8ICIsImNhdGVnb3J5X3R5cGUiOiJjYXRlZ29yeSJ9fQ==@[\/et_pb_text][et_pb_text _builder_version=&#8221;4.27.4&#8243; _module_preset=&#8221;default&#8221; text_line_height=&#8221;44em&#8221; header_font=&#8221;&#8211;et_global_heading_font||||||||&#8221; header_text_color=&#8221;#F7F7F7&#8243; header_font_size=&#8221;3.62rem&#8221; header_line_height=&#8221;66px&#8221; header_font_size_tablet=&#8221;4.25rem&#8221; header_font_size_phone=&#8221;2rem&#8221; header_font_size_last_edited=&#8221;on|phone&#8221; header_line_height_tablet=&#8221;76px&#8221; header_line_height_phone=&#8221;44px&#8221; header_line_height_last_edited=&#8221;on|phone&#8221; global_colors_info=&#8221;{}&#8221;]<\/p>\n<h1>The big sharks in Sardinia:<\/h1>\n<h1>predation and necrophagy.<\/h1>\n<p>[\/et_pb_text][et_pb_post_title title=&#8221;off&#8221; comments=&#8221;off&#8221; featured_image=&#8221;off&#8221; _builder_version=&#8221;4.27.4&#8243; _module_preset=&#8221;default&#8221; meta_text_color=&#8221;#57B8DF&#8221; meta_font_size=&#8221;1.4rem&#8221; global_colors_info=&#8221;{}&#8221;][\/et_pb_post_title][\/et_pb_column][\/et_pb_row][\/et_pb_section][et_pb_section fb_built=&#8221;1&#8243; _builder_version=&#8221;4.27.4&#8243; _module_preset=&#8221;default&#8221; background_color=&#8221;#FFFFFF&#8221; da_disable_devices=&#8221;off|off|off&#8221; global_colors_info=&#8221;{}&#8221; da_is_popup=&#8221;off&#8221; da_exit_intent=&#8221;off&#8221; da_has_close=&#8221;on&#8221; da_alt_close=&#8221;off&#8221; da_dark_close=&#8221;off&#8221; da_not_modal=&#8221;on&#8221; da_is_singular=&#8221;off&#8221; da_with_loader=&#8221;off&#8221; da_has_shadow=&#8221;on&#8221;][et_pb_row custom_padding_last_edited=&#8221;on|phone&#8221; _builder_version=&#8221;4.27.4&#8243; _module_preset=&#8221;default&#8221; width=&#8221;90%&#8221; max_width=&#8221;90%&#8221; custom_margin_tablet=&#8221;&#8221; custom_margin_phone=&#8221;0px||0px||true|false&#8221; custom_margin_last_edited=&#8221;on|phone&#8221; custom_padding_tablet=&#8221;&#8221; custom_padding_phone=&#8221;0px||0px||true|false&#8221; global_colors_info=&#8221;{}&#8221;][et_pb_column type=&#8221;4_4&#8243; _builder_version=&#8221;4.27.4&#8243; _module_preset=&#8221;default&#8221; global_colors_info=&#8221;{}&#8221;][et_pb_text _builder_version=&#8221;4.27.4&#8243; _module_preset=&#8221;default&#8221; text_font=&#8221;&#8211;et_global_body_font||||||||&#8221; text_text_color=&#8221;#000000&#8243; text_font_size=&#8221;1.5rem&#8221; text_line_height=&#8221;46px&#8221; header_text_color=&#8221;#000000&#8243; header_4_font=&#8221;&#8211;et_global_heading_font||||||||&#8221; header_4_text_color=&#8221;#000000&#8243; header_4_font_size=&#8221;1.5rem&#8221; header_4_line_height=&#8221;46px&#8221; text_font_size_tablet=&#8221;1.5rem&#8221; text_font_size_phone=&#8221;1rem&#8221; text_font_size_last_edited=&#8221;on|phone&#8221; text_line_height_tablet=&#8221;46px&#8221; text_line_height_phone=&#8221;28px&#8221; text_line_height_last_edited=&#8221;on|phone&#8221; global_colors_info=&#8221;{}&#8221;]<\/p>\n<p>Evidences of predation and scavenging by large predatory sharks upon specimens of striped dolphin (Stenella coeruleoalba) and short-beaked common dolphin (Delphinus delphis) stranded in the coast of Southern Sardinia.<\/p>\n<p>[\/et_pb_text][\/et_pb_column][\/et_pb_row][et_pb_row column_structure=&#8221;1_2,1_2&#8243; make_equal=&#8221;on&#8221; _builder_version=&#8221;4.27.4&#8243; _module_preset=&#8221;default&#8221; width=&#8221;90%&#8221; max_width=&#8221;90%&#8221; global_colors_info=&#8221;{}&#8221;][et_pb_column type=&#8221;1_2&#8243; _builder_version=&#8221;4.27.4&#8243; _module_preset=&#8221;default&#8221; global_colors_info=&#8221;{}&#8221;][et_pb_image src=&#8221;http:\/\/www.lagunadinora.it\/wp-content\/uploads\/2025\/03\/IGS_1.webp&#8221; title_text=&#8221;IGS_1&#8243; _builder_version=&#8221;4.27.4&#8243; _module_preset=&#8221;default&#8221; global_colors_info=&#8221;{}&#8221;][\/et_pb_image][\/et_pb_column][et_pb_column type=&#8221;1_2&#8243; _builder_version=&#8221;4.27.4&#8243; _module_preset=&#8221;default&#8221; global_colors_info=&#8221;{}&#8221;][et_pb_text _builder_version=&#8221;4.27.4&#8243; _module_preset=&#8221;default&#8221; text_line_height=&#8221;44em&#8221; header_font=&#8221;&#8211;et_global_heading_font||||||||&#8221; header_text_color=&#8221;#00529C&#8221; header_font_size=&#8221;3.62rem&#8221; header_line_height=&#8221;66px&#8221; header_font_size_tablet=&#8221;4.25rem&#8221; header_font_size_phone=&#8221;2rem&#8221; header_font_size_last_edited=&#8221;on|phone&#8221; header_line_height_tablet=&#8221;76px&#8221; header_line_height_phone=&#8221;44px&#8221; header_line_height_last_edited=&#8221;on|phone&#8221; global_colors_info=&#8221;{}&#8221;]<\/p>\n<h1>Introduction<\/h1>\n<p>[\/et_pb_text][et_pb_text _builder_version=&#8221;4.27.4&#8243; _module_preset=&#8221;default&#8221; text_font=&#8221;&#8211;et_global_body_font||||||||&#8221; text_text_color=&#8221;#000000&#8243; text_font_size=&#8221;1.5rem&#8221; text_line_height=&#8221;46px&#8221; header_text_color=&#8221;#000000&#8243; header_4_font=&#8221;&#8211;et_global_heading_font||||||||&#8221; header_4_text_color=&#8221;#000000&#8243; header_4_font_size=&#8221;1.5rem&#8221; header_4_line_height=&#8221;46px&#8221; text_font_size_tablet=&#8221;1.5rem&#8221; text_font_size_phone=&#8221;1rem&#8221; text_font_size_last_edited=&#8221;on|phone&#8221; text_line_height_tablet=&#8221;46px&#8221; text_line_height_phone=&#8221;28px&#8221; text_line_height_last_edited=&#8221;on|phone&#8221; global_colors_info=&#8221;{}&#8221;]<\/p>\n<p>Predation by large predatory sharks represents a rare albeit documented natural mortality factor affecting marine mammals in the Mediterranean Sea. Moreover, opportunistic foraging by elasmobranchs on cetacean carcasses is occasionally reported in stranding records. Centro Recupero Cetacei e Tartarughe Marine (CRCTM) Laguna di Nora operates through the network Rete Regionale per la Conservazione<br \/>della Fauna Marina under the Assessorato Difesa dell\u2019Ambiente of the Regione Autonoma della Sardegna authority. Since 1993, CRCTM core mission consists in monitoring, rescue and conservation of cetaceans and sea turtles of South-western Sardinian coasts. During CRCTM activities, three events of striped dolphin (Stenella coeruleoalba) and shortbeaked common dolphin (Delphinus delphis) interactions with large predatory sharks were investigated. Hypothesis for predation and\/or scavenging and predator species putatively involved in the events are presented.     <\/p>\n<p>[\/et_pb_text][et_pb_button button_url=&#8221;http:\/\/www.lagunadinora.it\/wp-content\/uploads\/2025\/03\/Luca_Zinzula_ECS_2018.pdf&#8221; button_text=&#8221;SEE THE scientific publication&#8221; disabled_on=&#8221;on|on|off&#8221; _builder_version=&#8221;4.27.4&#8243; _module_preset=&#8221;default&#8221; custom_button=&#8221;on&#8221; button_text_size=&#8221;0.9rem&#8221; button_text_color=&#8221;#57B8DF&#8221; button_border_color=&#8221;RGBA(255,255,255,0)&#8221; button_letter_spacing=&#8221;1px&#8221; button_font=&#8221;|600||on|||||&#8221; button_icon_color=&#8221;#FFFFFF&#8221; custom_margin=&#8221;0px||0px||true|false&#8221; custom_padding=&#8221;10px||10px||true|true&#8221; custom_css_free_form=&#8221;selector:not(:hover) {||\tcolor: black !important;||\tpadding:0px !important;||\tpadding-bottom:10px;||\tborder-bottom: 2px solid #57b8df !important;||}||||selector:hover{||\tcolor:white !important;||\tpadding:10px;||  border-bottom:0px !important;||}||&#8221; global_colors_info=&#8221;{}&#8221; button_text_color__hover_enabled=&#8221;on|desktop&#8221; button_text_color__hover=&#8221;#F7F7F7&#8243;][\/et_pb_button][\/et_pb_column][\/et_pb_row][et_pb_row column_structure=&#8221;1_2,1_2&#8243; make_equal=&#8221;on&#8221; _builder_version=&#8221;4.27.4&#8243; _module_preset=&#8221;default&#8221; width=&#8221;90%&#8221; max_width=&#8221;90%&#8221; global_colors_info=&#8221;{}&#8221;][et_pb_column type=&#8221;1_2&#8243; _builder_version=&#8221;4.27.4&#8243; _module_preset=&#8221;default&#8221; global_colors_info=&#8221;{}&#8221;][et_pb_image src=&#8221;http:\/\/www.lagunadinora.it\/wp-content\/uploads\/2025\/03\/IGS_2.webp&#8221; title_text=&#8221;IGS_2&#8243; _builder_version=&#8221;4.27.4&#8243; _module_preset=&#8221;default&#8221; hover_enabled=&#8221;0&#8243; global_colors_info=&#8221;{}&#8221; disabled_on=&#8221;off|off|on&#8221; sticky_enabled=&#8221;0&#8243;][\/et_pb_image][et_pb_text _builder_version=&#8221;4.27.4&#8243; _module_preset=&#8221;default&#8221; text_line_height=&#8221;44em&#8221; header_font=&#8221;&#8211;et_global_heading_font||||||||&#8221; header_text_color=&#8221;#00529C&#8221; header_font_size=&#8221;3.62rem&#8221; header_line_height=&#8221;66px&#8221; header_font_size_tablet=&#8221;4.25rem&#8221; header_font_size_phone=&#8221;2rem&#8221; header_font_size_last_edited=&#8221;on|phone&#8221; header_line_height_tablet=&#8221;76px&#8221; header_line_height_phone=&#8221;44px&#8221; header_line_height_last_edited=&#8221;on|phone&#8221; global_colors_info=&#8221;{}&#8221;]<\/p>\n<h1>Analysed events<\/h1>\n<p>[\/et_pb_text][et_pb_text _builder_version=&#8221;4.27.4&#8243; _module_preset=&#8221;default&#8221; text_font=&#8221;&#8211;et_global_body_font||||||||&#8221; text_text_color=&#8221;#000000&#8243; text_font_size=&#8221;1.5rem&#8221; text_line_height=&#8221;46px&#8221; header_text_color=&#8221;#000000&#8243; header_4_font=&#8221;&#8211;et_global_heading_font||||||||&#8221; header_4_text_color=&#8221;#000000&#8243; header_4_font_size=&#8221;1.5rem&#8221; header_4_line_height=&#8221;46px&#8221; text_font_size_tablet=&#8221;1.5rem&#8221; text_font_size_phone=&#8221;1rem&#8221; text_font_size_last_edited=&#8221;on|phone&#8221; text_line_height_tablet=&#8221;46px&#8221; text_line_height_phone=&#8221;28px&#8221; text_line_height_last_edited=&#8221;on|phone&#8221; global_colors_info=&#8221;{}&#8221;]<\/p>\n<ol>\n<li><strong>Pula, 2011; predation on Stenella coeruleoalba<br \/><\/strong>juvenile, n.d. ~ 550 mm (rostrum to mid-flank)<br \/>interdental distance (IDD) = 34 mm\n<\/li>\n<li><strong>Gonnesa, 2017 \u2013 predation\/scavenging on Stenella coeruleoalba<\/strong><br \/>juvenile, female TL = 1420 mm<br \/>bite circumference (BC) = 408 mm\n<\/li>\n<li><strong>San Pietro island, 2018; predation on Delphinus delphiss<br \/><\/strong>adult, male . TL = 1930 mm;<br \/>IDD = 30 mm; BC = 377 mm<\/li>\n<\/ol>\n<p>[\/et_pb_text][et_pb_text _builder_version=&#8221;4.27.4&#8243; _module_preset=&#8221;default&#8221; text_line_height=&#8221;44em&#8221; header_font=&#8221;&#8211;et_global_heading_font||||||||&#8221; header_text_color=&#8221;#00529C&#8221; header_font_size=&#8221;3.62rem&#8221; header_line_height=&#8221;66px&#8221; header_font_size_tablet=&#8221;4.25rem&#8221; header_font_size_phone=&#8221;2rem&#8221; header_font_size_last_edited=&#8221;on|phone&#8221; header_line_height_tablet=&#8221;76px&#8221; header_line_height_phone=&#8221;44px&#8221; header_line_height_last_edited=&#8221;on|phone&#8221; global_colors_info=&#8221;{}&#8221;]<\/p>\n<h1>Discussion<\/h1>\n<p>[\/et_pb_text][et_pb_text _builder_version=&#8221;4.27.4&#8243; _module_preset=&#8221;default&#8221; text_font=&#8221;&#8211;et_global_body_font||||||||&#8221; text_text_color=&#8221;#000000&#8243; text_font_size=&#8221;1.5rem&#8221; text_line_height=&#8221;46px&#8221; header_text_color=&#8221;#000000&#8243; header_4_font=&#8221;&#8211;et_global_heading_font||||||||&#8221; header_4_text_color=&#8221;#000000&#8243; header_4_font_size=&#8221;1.5rem&#8221; header_4_line_height=&#8221;46px&#8221; text_font_size_tablet=&#8221;1.5rem&#8221; text_font_size_phone=&#8221;1rem&#8221; text_font_size_last_edited=&#8221;on|phone&#8221; text_line_height_tablet=&#8221;46px&#8221; text_line_height_phone=&#8221;28px&#8221; text_line_height_last_edited=&#8221;on|phone&#8221; global_colors_info=&#8221;{}&#8221;]<\/p>\n<p>Three candidate shark species &#8211; two lamniforms (great white shark Carcharodon carcharias and shortfin mako Isurus oxyrinchus) and one carcharhiniform (dusky shark Carcharhinus obscurus) \u2013 were selected based on:<\/p>\n<ol>\n<li>Documented presence in the area;<\/li>\n<li>IDD and BC range spanning experimentally measured values;<\/li>\n<li>Known propensity to prey cetaceans<\/li>\n<\/ol>\n<p>IDD value from specimen 1 is compatible with C. carcharias of 4200 mm maximum estimated TL. BC value from specimen 2 matches C. carcharias, I. oxyrinchus and C. obscurus of 2966, 2779 and 3368 mm maximum estimated<\/p>\n<p>TL, respectively. IDD and BC values from specimen 3 match C. carcharias and I. oxyrinchus of 2730 and 3301 mm maximum estimated TL, respectively.<\/p>\n<p>[\/et_pb_text][et_pb_image src=&#8221;http:\/\/www.lagunadinora.it\/wp-content\/uploads\/2025\/03\/IGS_3.webp&#8221; title_text=&#8221;IGS_3&#8243; _builder_version=&#8221;4.27.4&#8243; _module_preset=&#8221;default&#8221; hover_enabled=&#8221;0&#8243; global_colors_info=&#8221;{}&#8221; disabled_on=&#8221;off|off|off&#8221; sticky_enabled=&#8221;0&#8243;][\/et_pb_image][\/et_pb_column][et_pb_column type=&#8221;1_2&#8243; _builder_version=&#8221;4.27.4&#8243; _module_preset=&#8221;default&#8221; global_colors_info=&#8221;{}&#8221;][et_pb_image src=&#8221;http:\/\/www.lagunadinora.it\/wp-content\/uploads\/2025\/03\/IGS_2.webp&#8221; title_text=&#8221;IGS_2&#8243; _builder_version=&#8221;4.27.4&#8243; _module_preset=&#8221;default&#8221; hover_enabled=&#8221;0&#8243; global_colors_info=&#8221;{}&#8221; sticky_enabled=&#8221;0&#8243; disabled_on=&#8221;on|on|off&#8221;][\/et_pb_image][et_pb_text _builder_version=&#8221;4.27.4&#8243; _module_preset=&#8221;default&#8221; text_line_height=&#8221;44em&#8221; header_font=&#8221;&#8211;et_global_heading_font||||||||&#8221; header_text_color=&#8221;#00529C&#8221; header_font_size=&#8221;3.62rem&#8221; header_line_height=&#8221;66px&#8221; header_font_size_tablet=&#8221;4.25rem&#8221; header_font_size_phone=&#8221;2rem&#8221; header_font_size_last_edited=&#8221;on|phone&#8221; header_line_height_tablet=&#8221;76px&#8221; header_line_height_phone=&#8221;44px&#8221; header_line_height_last_edited=&#8221;on|phone&#8221; global_colors_info=&#8221;{}&#8221;]<\/p>\n<h1>Materials and method<\/h1>\n<p>[\/et_pb_text][et_pb_text _builder_version=&#8221;4.27.4&#8243; _module_preset=&#8221;default&#8221; text_font=&#8221;&#8211;et_global_body_font||||||||&#8221; text_text_color=&#8221;#000000&#8243; text_font_size=&#8221;1.5rem&#8221; text_line_height=&#8221;46px&#8221; header_text_color=&#8221;#000000&#8243; header_4_font=&#8221;&#8211;et_global_heading_font||||||||&#8221; header_4_text_color=&#8221;#000000&#8243; header_4_font_size=&#8221;1.5rem&#8221; header_4_line_height=&#8221;46px&#8221; text_font_size_tablet=&#8221;1.5rem&#8221; text_font_size_phone=&#8221;1rem&#8221; text_font_size_last_edited=&#8221;on|phone&#8221; text_line_height_tablet=&#8221;46px&#8221; text_line_height_phone=&#8221;28px&#8221; text_line_height_last_edited=&#8221;on|phone&#8221; global_colors_info=&#8221;{}&#8221;]<\/p>\n<p>Data collection was part of CRCTM survey in South-western Sardinian coast, Italy. Morphometric measurements of stranded specimens were taken by using Vernier calipers and metric tape. Interdental distance (IDD) and bite circumference (BC) values were measured as in Lowry et al., (2009). Average IDD and BC values were logtransformed and fitted as independent variable on linear regression equations for the upper and lower jaw of selected shark species. Shark total length (TL) values were estimated by the antilog of fitted dependent variable, and size estimates for putative involved predators in each case were plotted against TL range references for selected species.    <\/p>\n<p>[\/et_pb_text][et_pb_button button_url=&#8221;http:\/\/www.lagunadinora.it\/wp-content\/uploads\/2025\/03\/Luca_Zinzula_ECS_2018.pdf&#8221; button_text=&#8221;SEE THE scientific publication&#8221; disabled_on=&#8221;on|on|off&#8221; _builder_version=&#8221;4.27.4&#8243; _module_preset=&#8221;default&#8221; custom_button=&#8221;on&#8221; button_text_size=&#8221;0.9rem&#8221; button_text_color=&#8221;#57B8DF&#8221; button_border_color=&#8221;RGBA(255,255,255,0)&#8221; button_letter_spacing=&#8221;1px&#8221; button_font=&#8221;|600||on|||||&#8221; button_icon_color=&#8221;#FFFFFF&#8221; custom_margin=&#8221;0px||0px||true|false&#8221; custom_padding=&#8221;10px||10px||true|true&#8221; custom_css_free_form=&#8221;selector:not(:hover) {||\tcolor: black !important;||\tpadding:0px !important;||\tpadding-bottom:10px;||\tborder-bottom: 2px solid #57b8df !important;||}||||selector:hover{||\tcolor:white !important;||\tpadding:10px;||  border-bottom:0px !important;||}||&#8221; 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