{"id":13263,"date":"2022-04-26T07:31:41","date_gmt":"2022-04-26T07:31:41","guid":{"rendered":"https:\/\/mousefreemarion.org\/presentacion-de-los-albatros-y-petreles-de-la-isla-marion-afectados-por-los-ratones-y-sus-fotografos-el-petrel-cariblanco-por-peter-ryan\/"},"modified":"2022-04-26T07:31:41","modified_gmt":"2022-04-26T07:31:41","slug":"presentacion-de-los-albatros-y-petreles-de-la-isla-marion-afectados-por-los-ratones-y-sus-fotografos-el-petrel-cariblanco-por-peter-ryan","status":"publish","type":"post","link":"https:\/\/mousefreemarion.org\/es\/presentacion-de-los-albatros-y-petreles-de-la-isla-marion-afectados-por-los-ratones-y-sus-fotografos-el-petrel-cariblanco-por-peter-ryan\/","title":{"rendered":"Presentaci\u00f3n de los albatros y petreles de la isla Marion afectados por los ratones y sus fot\u00f3grafos: el petrel cariblanco por Peter Ryan"},"content":{"rendered":"<p>Imagen superior:  <em>Como la mayor\u00eda de los petreles que anidan en madrigueras, el petrel cariblanco es mayoritariamente nocturno en sus colonias. Sin embargo, su gran tama\u00f1o les da cierto grado de bravuconer\u00eda a la hora de enfrentarse a los sk\u00faas pardos, y de vez en cuando se sientan fuera de las entradas de sus madrigueras durante el d\u00eda.<\/em><\/p>\n<p>El petrel de barbilla blanca <em>Procellaria aequinoctialis<\/em> es el miembro m\u00e1s grande de la familia de los petreles despu\u00e9s de los dos petreles gigantes <em>Macronectes <\/em>spp. Se reproduce en las islas subant\u00e1rticas, con tres poblaciones regionales: la subespecie nominada se reproduce en Georgia del Sur y localmente en las Malvinas, en el suroeste del oc\u00e9ano Atl\u00e1ntico, y en las islas Pr\u00edncipe Eduardo, Crozet y Kerguelen, en el suroeste del oc\u00e9ano \u00cdndico, mientras que  <em>P. a. steadi<\/em>  Se cr\u00eda en islas al sur de Nueva Zelanda.<\/p>\n<div id=\"attachment_8481\" style=\"width: 810px\" class=\"wp-caption aligncenter\"><img decoding=\"async\" aria-describedby=\"caption-attachment-8481\" class=\"wp-image-8481 size-fusion-800\" src=\"https:\/\/mousefreemarion.org\/wp-content\/uploads\/2022\/04\/PeterRyan-Photo-800x748.jpg\" alt=\"\" width=\"800\" height=\"748\" srcset=\"https:\/\/mousefreemarion.org\/wp-content\/uploads\/2022\/04\/PeterRyan-Photo-200x187.jpg 200w, https:\/\/mousefreemarion.org\/wp-content\/uploads\/2022\/04\/PeterRyan-Photo-300x280.jpg 300w, https:\/\/mousefreemarion.org\/wp-content\/uploads\/2022\/04\/PeterRyan-Photo-400x374.jpg 400w, https:\/\/mousefreemarion.org\/wp-content\/uploads\/2022\/04\/PeterRyan-Photo-500x467.jpg 500w, https:\/\/mousefreemarion.org\/wp-content\/uploads\/2022\/04\/PeterRyan-Photo-600x561.jpg 600w, https:\/\/mousefreemarion.org\/wp-content\/uploads\/2022\/04\/PeterRyan-Photo-700x654.jpg 700w, https:\/\/mousefreemarion.org\/wp-content\/uploads\/2022\/04\/PeterRyan-Photo-768x718.jpg 768w, https:\/\/mousefreemarion.org\/wp-content\/uploads\/2022\/04\/PeterRyan-Photo-800x748.jpg 800w, https:\/\/mousefreemarion.org\/wp-content\/uploads\/2022\/04\/PeterRyan-Photo-1024x957.jpg 1024w, https:\/\/mousefreemarion.org\/wp-content\/uploads\/2022\/04\/PeterRyan-Photo-1200x1121.jpg 1200w, https:\/\/mousefreemarion.org\/wp-content\/uploads\/2022\/04\/PeterRyan-Photo.jpg 1204w\" sizes=\"(max-width: 800px) 100vw, 800px\" \/><p id=\"caption-attachment-8481\" class=\"wp-caption-text\">Peter Ryan busca aves marinas, entre ellas petreles de barba blanca, en un viaje por el Oc\u00e9ano Austral.<\/p><\/div>\n<p>El petrel de barba blanca es el ave marina m\u00e1s capturada con palangre en el Oc\u00e9ano Austral. Desde que empec\u00e9 a comprobar la edad y el sexo de las aves marinas enganchadas devueltas a los puertos sudafricanos por los observadores de la pesca, he examinado casi 4.000 petreles cariblancos. Son buceadores competentes, alcanzando ocasionalmente profundidades de hasta 16 m, lo que les permite recuperar anzuelos cebados a cierta distancia detr\u00e1s de las embarcaciones. De hecho, se cree que facilitan la captura accidental de albatros llevando los anzuelos a la superficie, s\u00f3lo para ser desplazados por albatros m\u00e1s grandes.<\/p>\n<div id=\"attachment_8487\" style=\"width: 611px\" class=\"wp-caption aligncenter\"><img decoding=\"async\" aria-describedby=\"caption-attachment-8487\" class=\"wp-image-8487 size-full\" src=\"https:\/\/mousefreemarion.org\/wp-content\/uploads\/2022\/04\/burrow.jpg\" alt=\"\" width=\"601\" height=\"449\" srcset=\"https:\/\/mousefreemarion.org\/wp-content\/uploads\/2022\/04\/burrow-200x149.jpg 200w, https:\/\/mousefreemarion.org\/wp-content\/uploads\/2022\/04\/burrow-300x224.jpg 300w, https:\/\/mousefreemarion.org\/wp-content\/uploads\/2022\/04\/burrow-400x299.jpg 400w, https:\/\/mousefreemarion.org\/wp-content\/uploads\/2022\/04\/burrow-500x374.jpg 500w, https:\/\/mousefreemarion.org\/wp-content\/uploads\/2022\/04\/burrow.jpg 601w\" sizes=\"(max-width: 601px) 100vw, 601px\" \/><p id=\"caption-attachment-8487\" class=\"wp-caption-text\"><em>El petrel cariblanco es el petrel que anida en madrigueras m\u00e1s grande, y sus madrigueras tienden a ser bastante obvias; la mayor\u00eda tienen un foso de entrada<\/em><\/p><\/div>\n<div id=\"attachment_8485\" style=\"width: 810px\" class=\"wp-caption aligncenter\"><img decoding=\"async\" aria-describedby=\"caption-attachment-8485\" class=\"wp-image-8485 size-fusion-800\" src=\"https:\/\/mousefreemarion.org\/wp-content\/uploads\/2022\/04\/WCP-map-from-Ryan2012-800x576.png\" alt=\"\" width=\"800\" height=\"576\" srcset=\"https:\/\/mousefreemarion.org\/wp-content\/uploads\/2022\/04\/WCP-map-from-Ryan2012-200x144.png 200w, https:\/\/mousefreemarion.org\/wp-content\/uploads\/2022\/04\/WCP-map-from-Ryan2012-300x216.png 300w, https:\/\/mousefreemarion.org\/wp-content\/uploads\/2022\/04\/WCP-map-from-Ryan2012-400x288.png 400w, https:\/\/mousefreemarion.org\/wp-content\/uploads\/2022\/04\/WCP-map-from-Ryan2012-500x360.png 500w, https:\/\/mousefreemarion.org\/wp-content\/uploads\/2022\/04\/WCP-map-from-Ryan2012-600x432.png 600w, https:\/\/mousefreemarion.org\/wp-content\/uploads\/2022\/04\/WCP-map-from-Ryan2012-700x504.png 700w, https:\/\/mousefreemarion.org\/wp-content\/uploads\/2022\/04\/WCP-map-from-Ryan2012-768x553.png 768w, https:\/\/mousefreemarion.org\/wp-content\/uploads\/2022\/04\/WCP-map-from-Ryan2012-800x576.png 800w, https:\/\/mousefreemarion.org\/wp-content\/uploads\/2022\/04\/WCP-map-from-Ryan2012-1024x737.png 1024w, https:\/\/mousefreemarion.org\/wp-content\/uploads\/2022\/04\/WCP-map-from-Ryan2012.png 1046w\" sizes=\"(max-width: 800px) 100vw, 800px\" \/><p id=\"caption-attachment-8485\" class=\"wp-caption-text\"><em>Los grandes y caracter\u00edsticos nidos en madriguera de los petreles cariblancos permiten intentar un estudio completo de su distribuci\u00f3n reproductora en la isla Marion. La mayor\u00eda de las colonias est\u00e1n cerca de la costa, pero hay nidos hasta 420 m sobre el nivel del mar por debajo de Spitskop (mapa de Ryan et al. 2012). Prefieren lugares bien drenados con suelos profundos para excavar, evitando las coladas de lava negra m\u00e1s recientes.<\/em><\/p><\/div>\n<p>Dada la preocupaci\u00f3n por el estado de su poblaci\u00f3n -la especie est\u00e1 catalogada como Vulnerable a nivel mundial-, fue el primer petrel de madriguera para el que intentamos estimar la poblaci\u00f3n reproductora en las islas del Pr\u00edncipe Eduardo. Genevieve Jones, Ben Dilley y yo realizamos un estudio sistem\u00e1tico de todas las madrigueras en abril de 2009, y Ben hizo un seguimiento con comprobaciones de ocupaci\u00f3n la siguiente temporada de cr\u00eda. Esto indicaba una poblaci\u00f3n total de unas 30 000 parejas en la isla de Marion y al menos otras 10 000 parejas en la isla del Pr\u00edncipe Eduardo. Transectos aleatorios posteriores realizados alrededor de la isla Marion en 2015 por Ben, Stefan Schoombie, Alexis Osborne y yo indicaron que esta estimaci\u00f3n inicial era demasiado baja, con una extrapolaci\u00f3n de 40 000 parejas criando en la isla. Esto convierte a las Islas del Pr\u00edncipe Eduardo en el tercer lugar de cr\u00eda m\u00e1s importante para la subespecie nominada despu\u00e9s de Georgia del Sur y Kerguelen.<\/p>\n<div id=\"attachment_8484\" style=\"width: 810px\" class=\"wp-caption aligncenter\"><img decoding=\"async\" aria-describedby=\"caption-attachment-8484\" class=\"wp-image-8484 size-fusion-800\" src=\"https:\/\/mousefreemarion.org\/wp-content\/uploads\/2022\/04\/WCP-fledgling-Marion-Peter-Ryan-800x538.jpg\" alt=\"\" width=\"800\" height=\"538\" srcset=\"https:\/\/mousefreemarion.org\/wp-content\/uploads\/2022\/04\/WCP-fledgling-Marion-Peter-Ryan-200x135.jpg 200w, https:\/\/mousefreemarion.org\/wp-content\/uploads\/2022\/04\/WCP-fledgling-Marion-Peter-Ryan-300x202.jpg 300w, https:\/\/mousefreemarion.org\/wp-content\/uploads\/2022\/04\/WCP-fledgling-Marion-Peter-Ryan-400x269.jpg 400w, https:\/\/mousefreemarion.org\/wp-content\/uploads\/2022\/04\/WCP-fledgling-Marion-Peter-Ryan-500x336.jpg 500w, https:\/\/mousefreemarion.org\/wp-content\/uploads\/2022\/04\/WCP-fledgling-Marion-Peter-Ryan-600x404.jpg 600w, https:\/\/mousefreemarion.org\/wp-content\/uploads\/2022\/04\/WCP-fledgling-Marion-Peter-Ryan-700x471.jpg 700w, https:\/\/mousefreemarion.org\/wp-content\/uploads\/2022\/04\/WCP-fledgling-Marion-Peter-Ryan-768x517.jpg 768w, https:\/\/mousefreemarion.org\/wp-content\/uploads\/2022\/04\/WCP-fledgling-Marion-Peter-Ryan-800x538.jpg 800w, https:\/\/mousefreemarion.org\/wp-content\/uploads\/2022\/04\/WCP-fledgling-Marion-Peter-Ryan-1024x689.jpg 1024w, https:\/\/mousefreemarion.org\/wp-content\/uploads\/2022\/04\/WCP-fledgling-Marion-Peter-Ryan-1200x807.jpg 1200w, https:\/\/mousefreemarion.org\/wp-content\/uploads\/2022\/04\/WCP-fledgling-Marion-Peter-Ryan-1536x1033.jpg 1536w\" sizes=\"(max-width: 800px) 100vw, 800px\" \/><p id=\"caption-attachment-8484\" class=\"wp-caption-text\"><em>En marzo y abril, en la isla Marion, los pollos de petrel cariblanco ejercitan las alas fuera de sus madrigueras por la noche para prepararse para volar. Algunos no consiguen volver a la seguridad de sus madrigueras al amanecer y suelen ser presa de los sk\u00faas pardos.<\/em><\/p><\/div>\n<p>A pesar de su frecuente mortalidad en los palangres, el n\u00famero de petreles comunes ha mostrado la mayor recuperaci\u00f3n entre los petreles que anidan en madrigueras en la isla Marion tras la erradicaci\u00f3n de los gatos en 1991. Por lo general, su \u00e9xito reproductor es bastante elevado (una media del 59% de los intentos consigue sacar un polluelo), lo que sugiere que sus polluelos rara vez son atacados por los ratones dom\u00e9sticos introducidos. A este respecto, probablemente les ayuden su gran tama\u00f1o y el hecho de criar en verano, cuando los ratones disponen de un mayor abanico de otras opciones alimentarias que en invierno. Sorprendentemente, los pollos grandes pueden ser matados ocasionalmente por los petreles grises si encuentran un pollo de petrel com\u00fan en su madriguera cuando vuelven a criar en oto\u00f1o.<\/p>\n<div id=\"attachment_8482\" style=\"width: 810px\" class=\"wp-caption aligncenter\"><img decoding=\"async\" aria-describedby=\"caption-attachment-8482\" class=\"wp-image-8482 size-fusion-800\" src=\"https:\/\/mousefreemarion.org\/wp-content\/uploads\/2022\/04\/WCP-at-sea-Peter-Ryan-800x580.jpg\" alt=\"\" width=\"800\" height=\"580\" srcset=\"https:\/\/mousefreemarion.org\/wp-content\/uploads\/2022\/04\/WCP-at-sea-Peter-Ryan-200x145.jpg 200w, https:\/\/mousefreemarion.org\/wp-content\/uploads\/2022\/04\/WCP-at-sea-Peter-Ryan-300x217.jpg 300w, https:\/\/mousefreemarion.org\/wp-content\/uploads\/2022\/04\/WCP-at-sea-Peter-Ryan-400x290.jpg 400w, https:\/\/mousefreemarion.org\/wp-content\/uploads\/2022\/04\/WCP-at-sea-Peter-Ryan-500x362.jpg 500w, https:\/\/mousefreemarion.org\/wp-content\/uploads\/2022\/04\/WCP-at-sea-Peter-Ryan-600x435.jpg 600w, https:\/\/mousefreemarion.org\/wp-content\/uploads\/2022\/04\/WCP-at-sea-Peter-Ryan-700x507.jpg 700w, https:\/\/mousefreemarion.org\/wp-content\/uploads\/2022\/04\/WCP-at-sea-Peter-Ryan-768x557.jpg 768w, https:\/\/mousefreemarion.org\/wp-content\/uploads\/2022\/04\/WCP-at-sea-Peter-Ryan-800x580.jpg 800w, https:\/\/mousefreemarion.org\/wp-content\/uploads\/2022\/04\/WCP-at-sea-Peter-Ryan-1024x742.jpg 1024w, https:\/\/mousefreemarion.org\/wp-content\/uploads\/2022\/04\/WCP-at-sea-Peter-Ryan-1200x870.jpg 1200w, https:\/\/mousefreemarion.org\/wp-content\/uploads\/2022\/04\/WCP-at-sea-Peter-Ryan-1536x1113.jpg 1536w\" sizes=\"(max-width: 800px) 100vw, 800px\" \/><p id=\"caption-attachment-8482\" class=\"wp-caption-text\"><em>Un petrel cariblanco planea junto al fot\u00f3grafo en el Oc\u00e9ano Austral<\/em><\/p><\/div>\n<div id=\"attachment_8483\" style=\"width: 810px\" class=\"wp-caption aligncenter\"><img decoding=\"async\" aria-describedby=\"caption-attachment-8483\" class=\"wp-image-8483 size-fusion-800\" src=\"https:\/\/mousefreemarion.org\/wp-content\/uploads\/2022\/04\/WCP-calling-at-sea-Peter-Ryan-800x548.jpg\" alt=\"\" width=\"800\" height=\"548\" srcset=\"https:\/\/mousefreemarion.org\/wp-content\/uploads\/2022\/04\/WCP-calling-at-sea-Peter-Ryan-200x137.jpg 200w, https:\/\/mousefreemarion.org\/wp-content\/uploads\/2022\/04\/WCP-calling-at-sea-Peter-Ryan-300x206.jpg 300w, https:\/\/mousefreemarion.org\/wp-content\/uploads\/2022\/04\/WCP-calling-at-sea-Peter-Ryan-400x274.jpg 400w, https:\/\/mousefreemarion.org\/wp-content\/uploads\/2022\/04\/WCP-calling-at-sea-Peter-Ryan-500x343.jpg 500w, https:\/\/mousefreemarion.org\/wp-content\/uploads\/2022\/04\/WCP-calling-at-sea-Peter-Ryan-600x411.jpg 600w, https:\/\/mousefreemarion.org\/wp-content\/uploads\/2022\/04\/WCP-calling-at-sea-Peter-Ryan-700x480.jpg 700w, https:\/\/mousefreemarion.org\/wp-content\/uploads\/2022\/04\/WCP-calling-at-sea-Peter-Ryan-768x526.jpg 768w, https:\/\/mousefreemarion.org\/wp-content\/uploads\/2022\/04\/WCP-calling-at-sea-Peter-Ryan-800x548.jpg 800w, https:\/\/mousefreemarion.org\/wp-content\/uploads\/2022\/04\/WCP-calling-at-sea-Peter-Ryan-1024x702.jpg 1024w, https:\/\/mousefreemarion.org\/wp-content\/uploads\/2022\/04\/WCP-calling-at-sea-Peter-Ryan-1200x822.jpg 1200w, https:\/\/mousefreemarion.org\/wp-content\/uploads\/2022\/04\/WCP-calling-at-sea-Peter-Ryan-1536x1052.jpg 1536w\" sizes=\"(max-width: 800px) 100vw, 800px\" \/><p id=\"caption-attachment-8483\" class=\"wp-caption-text\"><em>En el mar, el petrel de barba blanca es uno de los m\u00e1s ruidosos y suele emitir su caracter\u00edstico chirrido durante las peleas por la comida.<\/em><\/p><\/div>\n<p><strong>Referencias:<\/strong><\/p>\n<p>Dilley, B.J., Davies, D., Schoombie, S., Schoombie, J. &amp; Ryan, P.G. 2019. Guerras de madrigueras y comportamiento siniestro entre petreles que anidan en madrigueras en la isla subant\u00e1rtica de Marion. <strong><br \/>\n  <a href=\"https:\/\/bioone.org\/journals\/Ardea\/volume-107\/issue-1\/arde.v107i1.a5\/Burrow-Wars-and-Sinister-Behaviour-among-Burrow-Nesting-Petrels-at\/10.5253\/arde.v107i1.a5.short\" target=\"_blank\" rel=\"noopener\"><em>Ardea<\/em> 107: 97-102<\/a><br \/>\n<\/strong>.<\/p>\n<p>Dilley, B.J., Hedding, D.W., Henry, D.A.W., Rexer-Huber, K, Parker, G.C., Schoombie, S., Osborne, A. &amp; Ryan, P.G. 2019. Agrupados o dispersos: probando el efecto de la estrategia de muestreo para censar petreles que anidan en madrigueras con distribuciones variadas en la Isla Marion subant\u00e1rtica. <strong><br \/>\n  <a href=\"https:\/\/www.cambridge.org\/core\/journals\/antarctic-science\/article\/abs\/clustered-or-dispersed-testing-the-effect-of-sampling-strategy-to-census-burrownesting-petrels-with-varied-distributions-at-subantarctic-marion-island\/A4F932E9B3866E60D9A0C82D9AD6EBD6\" target=\"_blank\" rel=\"noopener\"><em>Ciencia Ant\u00e1rtica<\/em> 31: 231-242<\/a><br \/>\n<\/strong>.<\/p>\n<p>Dilley, B.J., Schoombie, S., Stevens, K., Davies, D., Perold, V., Osborne, A., Schoombie, J., Brink, C.W., Carpenter-Kling, T. &amp; Ryan, P.G. 2018. La depredaci\u00f3n por ratones afecta al \u00e9xito reproductor de los petreles que anidan en madrigueras en la isla subant\u00e1rtica de Marion. <strong><br \/>\n  <a href=\"https:\/\/www.cambridge.org\/core\/journals\/antarctic-science\/article\/abs\/mouse-predation-affects-breeding-success-of-burrownesting-petrels-at-subantarctic-marion-island\/738188E74C0785B51AAA6438FD9F3FB0\" target=\"_blank\" rel=\"noopener\"><em>Ciencia ant\u00e1rtica<\/em> 30: 93-104<\/a><br \/>\n<\/strong>.<\/p>\n<p>Dilley, B.J., Schramm, M. y Ryan, P.G. 2016. Aumento moderado de las densidades de petreles que anidan en madrigueras tras la retirada de los gatos<em>(Felis catus<\/em>) de la isla Marion. <strong><br \/>\n  <a href=\"https:\/\/link.springer.com\/article\/10.1007\/s00300-016-1985-z\" target=\"_blank\" rel=\"noopener\"><em>Biolog\u00eda polar<\/em> 40: 625-637<\/a><br \/>\n<\/strong>.<\/p>\n<p>Rollinson, D.P., Dilley, B.J. y Ryan, P.G. 2014. Comportamiento de buceo de los petreles cariblancos y su importancia para mitigar las capturas accesorias de los palangreros. <strong><br \/>\n  <a href=\"https:\/\/link.springer.com\/article\/10.1007\/s00300-014-1521-y\" target=\"_blank\" rel=\"noopener\"><em>Polar Biology<\/em> 37: 1301-1308.<\/a><br \/>\n<\/strong><\/p>\n<p>Ryan, P.G. 2001. Leucismo parcial en petreles cariblancos. <em>Bird Numbers<\/em> 10(2): 6-7.<\/p>\n<p>Ryan, P.G., Dilley, B.J. &amp; Jones, M.G.W. 2012. Distribuci\u00f3n y abundancia del petrel cariblanco<em>(Procellaria aequinoctialis<\/em>) reproductor en las islas subant\u00e1rticas del Pr\u00edncipe Eduardo. <strong><br \/>\n  <a href=\"https:\/\/link.springer.com\/article\/10.1007\/s00300-012-1227-y\" target=\"_blank\" rel=\"noopener\"><em>Biolog\u00eda polar <\/em>35: 1851-1859<\/a><br \/>\n<\/strong>.<\/p>\n<p><em>Peter Ryan, Instituto FitzPatrick de Ornitolog\u00eda Africana, Universidad de Ciudad del Cabo, 26 <\/em><em>de abril de 2022<\/em><\/p>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Imagen superior: Como la mayor\u00eda de los petreles que anidan  [&#8230;]<\/p>\n","protected":false},"author":1,"featured_media":9827,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[73,30],"tags":[],"class_list":["post-13263","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-fotografia","category-sin-categorizar"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.2 - 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