{"id":1699,"date":"2026-08-11T10:00:00","date_gmt":"2026-08-11T10:00:00","guid":{"rendered":"https:\/\/wp.ull.es\/omacc\/?post_type=project&p=1699"},"modified":"2026-11-06T19:33:30","modified_gmt":"2026-11-06T19:33:30","slug":"ocean-acidification-drives-grazer-niche-convergence-and-trophic-homogenization-in-benthic-communities-gonzalez-delgado-et-al-2026","status":"publish","type":"project","link":"https:\/\/wp.ull.es\/omacc\/project\/ocean-acidification-drives-grazer-niche-convergence-and-trophic-homogenization-in-benthic-communities-gonzalez-delgado-et-al-2026\/","title":{"rendered":"Ocean acidification drives grazer niche convergence and trophic homogenization in benthic communities. Gonz\u00e1lez-Delgado et al., 2026"},"content":{"rendered":"[et_pb_section fb_built=\u00bb1″ _builder_version=\u00bb4.9.7″ _module_preset=\u00bbdefault\u00bb][et_pb_row _builder_version=\u00bb4.9.7″ _module_preset=\u00bbdefault\u00bb][et_pb_column type=\u00bb4_4″ _builder_version=\u00bb4.9.7″ _module_preset=\u00bbdefault\u00bb][et_pb_text _builder_version=\u00bb4.9.7″ _module_preset=\u00bbdefault\u00bb header_2_font=\u00bb|700|||||||\u00bb]\n

Ocean acidification drives grazer niche convergence and trophic homogenization in benthic communities<\/h2>\n[\/et_pb_text][\/et_pb_column][\/et_pb_row][et_pb_row column_structure=\u00bb2_5,3_5″ _builder_version=\u00bb4.9.7″ _module_preset=\u00bbdefault\u00bb][et_pb_column type=\u00bb2_5″ _builder_version=\u00bb4.9.7″ _module_preset=\u00bbdefault\u00bb][et_pb_image src=\u00bbhttps:\/\/wp.ull.es\/omacc\/wp-content\/uploads\/sites\/110\/2026\/11\/Paper_webOMACC-4.png\u00bb title_text=\u00bb2026-Gonzalez-Delgado-et-al-MPB\u00bb alt=\u00bbPortada: Ocean acidification drives grazer niche convergence and trophic homogenization in benthic communities\u00bb _builder_version=\u00bb4.9.7″ _module_preset=\u00bbdefault\u00bb border_width_all=\u00bb2px\u00bb border_color_all=\u00bb#0C997F\u00bb][\/et_pb_image][\/et_pb_column][et_pb_column type=\u00bb3_5″ _builder_version=\u00bb4.9.7″ _module_preset=\u00bbdefault\u00bb][et_pb_text _builder_version=\u00bb4.9.7″ _module_preset=\u00bbdefault\u00bb]\n
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2026. GONZ\u00c1LEZ-DELGADO, S., CARDONA, L., RUFINO-NAVARRO, A., HERN\u00c1NDEZ, J. C., & P\u00c9REZ-PORTELA, R. Ocean acidification drives grazer niche convergence and trophic homogenization in benthic communities. Marine Pollution Bulletin, 233, 120225.<\/span><\/p>\n<\/blockquote>\n[\/et_pb_text][et_pb_text _builder_version=\u00bb4.9.7″ _module_preset=\u00bbdefault\u00bb]\n

Se espera que la acidificaci\u00f3n oce\u00e1nica altere las redes tr\u00f3ficas marinas, pero las evidencias a escala de comunidad procedentes de sistemas acidificados de forma natural y a largo plazo siguen siendo escasas. Utilizamos is\u00f3topos estables (\u03b413<\/sup>C y \u03b415<\/sup>N) para investigar c\u00f3mo la acidificaci\u00f3n natural reestructura las interacciones tr\u00f3ficas bent\u00f3nicas, desde los recursos basales hasta la din\u00e1mica de nicho de los consumidores, en un sistema acidificado de forma natural (gradiente de pH de 8,1 a ~7,4; escala pHT) que abarca desde las condiciones actuales hasta las previstas para final de siglo (SSP2\u20134.5 a SSP5\u20138.5). Tras corregir las diferencias locales en la l\u00ednea base isot\u00f3pica, encontramos que: (1) el espacio isot\u00f3pico de la comunidad se contrajo con la acidificaci\u00f3n: el rango de carbono disminuy\u00f3 al converger los productores primarios hacia valores empobrecidos en 13<\/sup>C, mientras que el rango de nitr\u00f3geno se ampli\u00f3, lo que indica ajustes tr\u00f3ficos propios de cada especie; (2) los grupos funcionales respondieron de forma asim\u00e9trica: los productores primarios mostraron los mayores cambios en \u03b413<\/sup>C, los filtradores se mantuvieron relativamente estables y los consumidores omn\u00edvoros redujeron sus valores de \u03b413<\/sup>C y \u03b415<\/sup>N; (3) los dos erizos herb\u00edvoros dominantes respondieron en direcciones opuestas: el omn\u00edvoro basado en macr\u00f3fitos Paracentrotus lividus<\/em> mantuvo valores isot\u00f3picos estables a lo largo del gradiente de pH, mientras que el omn\u00edvoro basado en invertebrados Arbacia lixula<\/em> mostr\u00f3 cambios isot\u00f3picos marcados, lo que aument\u00f3 mucho el solapamiento de nicho, aunque de forma dependiente del sitio, en las zonas m\u00e1s acidificadas (hasta un 27 %); (4) los modelos de mezcla bayesianos revelaron que esta convergencia se debi\u00f3 a cambios en la dieta de A. lixula<\/em>, que pas\u00f3 de una dieta basada principalmente en invertebrados (70\u201379 % de presas animales) a una alimentaci\u00f3n basada en algas con la acidificaci\u00f3n (19\u201324 % de presas animales), mientras que P. lividus<\/em> mantuvo una dieta relativamente constante (50\u201370 % de algas). En conjunto, estos resultados indican que la homogeneizaci\u00f3n de los productores primarios provocada por la acidificaci\u00f3n, junto con las respuestas asim\u00e9tricas de los consumidores, comprime el espacio de nicho tr\u00f3fico, con amplias implicaciones para la resiliencia y el funcionamiento de los ecosistemas bent\u00f3nicos ante el cambio oce\u00e1nico futuro.<\/p>\n[\/et_pb_text][et_pb_button button_url=\u00bbhttps:\/\/doi.org\/10.1016\/j.marpolbul.2026.120225″ url_new_window=\u00bbon\u00bb button_text=\u00bbDescargar pdf\u00bb _builder_version=\u00bb4.9.7″ _module_preset=\u00bbdefault\u00bb custom_button=\u00bbon\u00bb button_text_size=\u00bb13px\u00bb button_bg_color=\u00bb#0C997F\u00bb][\/et_pb_button][\/et_pb_column][\/et_pb_row][et_pb_row column_structure=\u00bb2_5,3_5″ _builder_version=\u00bb4.9.7″ _module_preset=\u00bbdefault\u00bb][et_pb_column type=\u00bb2_5″ _builder_version=\u00bb4.9.7″ _module_preset=\u00bbdefault\u00bb][\/et_pb_column][et_pb_column type=\u00bb3_5″ _builder_version=\u00bb4.9.7″ _module_preset=\u00bbdefault\u00bb][et_pb_toggle title=\u00bbEnglish\u00bb open_toggle_text_color=\u00bb#0C997F\u00bb open_toggle_background_color=\u00bb#FFFFFF\u00bb closed_toggle_text_color=\u00bb#0C997F\u00bb closed_toggle_background_color=\u00bb#FFFFFF\u00bb icon_color=\u00bb#0C997F\u00bb _builder_version=\u00bb4.9.7″ _module_preset=\u00bbdefault\u00bb title_font=\u00bb|||on|||||\u00bb closed_title_font=\u00bb|||on|||||\u00bb closed_title_font_size=\u00bb14px\u00bb closed_title_line_height=\u00bb1.5em\u00bb custom_padding=\u00bb7px||7px||true|false\u00bb border_color_all=\u00bb#0C997F\u00bb]\n

Ocean acidification is expected to alter marine food webs, yet community-level evidence from long-term, naturally acidified systems remains limited. We used stable isotope ratios (\u03b413<\/sup>C and \u03b415<\/sup>N) to investigate how natural acidification restructures benthic trophic interactions, from basal resources to consumer niche dynamics, a naturally acidified system (pH gradient: 8.1 to ~7.4; pHT scale) spanning present-day to end-of-century projected conditions (SSP2\u20134.5 to SSP5\u20138.5). After accounting for local differences in the isotopic baseline, we found that: (1) community isotopic space contracted under acidification, with the carbon range decreasing as primary producers converged toward 13<\/sup>C-depleted values, while the nitrogen range expanded, indicating species-specific trophic adjustments; (2) functional groups responded asymmetrically, with primary producers showing the strongest \u03b413<\/sup>C shifts, filter-feeders remaining relatively stable, and omnivorous consumers showing reduced \u03b413<\/sup>C and \u03b415<\/sup>N values; (3) the two dominant sea urchin grazers responded in opposite directions \u2014 the macrophyte-based omnivore Paracentrotus lividus<\/em> maintained stable isotopic values across the pH gradient, whereas the invertebrate-based omnivore Arbacia lixula<\/em> exhibited pronounced isotopic shifts \u2014 resulting in markedly increased, though site-dependent, niche overlap at the most acidified sites (up to 27%); (4) Bayesian mixing models revealed that this convergence was driven by dietary shifts in A. lixula<\/em>, which transitioned from a predominantly invertebrate-based diet (70\u201379% animal prey) toward algal-based feeding under acidification (19\u201324% animal prey), while P. lividus<\/em> maintained relatively consistent dietary composition (50\u201370% algae). Together, these results indicate that acidification-driven homogenization of primary producers, combined with asymmetric consumer responses, compresses trophic niche space, with broad implications for the resilience and functioning of benthic ecosystems under future ocean change.<\/p>\n[\/et_pb_toggle][\/et_pb_column][\/et_pb_row][\/et_pb_section]\n","protected":false},"excerpt":{"rendered":"

[et_pb_section fb_built=\u00bb1″ _builder_version=\u00bb4.9.7″ _module_preset=\u00bbdefault\u00bb][et_pb_row _builder_version=\u00bb4.9.7″ _module_preset=\u00bbdefault\u00bb][et_pb_column type=\u00bb4_4″ _builder_version=\u00bb4.9.7″ _module_preset=\u00bbdefault\u00bb][et_pb_text _builder_version=\u00bb4.9.7″ _module_preset=\u00bbdefault\u00bb header_2_font=\u00bb|700|||||||\u00bb] Ocean acidification drives grazer niche convergence and trophic homogenization in benthic communities [\/et_pb_text][\/et_pb_column][\/et_pb_row][et_pb_row column_structure=\u00bb2_5,3_5″ _builder_version=\u00bb4.9.7″ _module_preset=\u00bbdefault\u00bb][et_pb_column type=\u00bb2_5″ _builder_version=\u00bb4.9.7″ _module_preset=\u00bbdefault\u00bb][et_pb_image src=\u00bbhttps:\/\/wp.ull.es\/omacc\/wp-content\/uploads\/sites\/110\/2026\/11\/Paper_webOMACC-4.png\u00bb title_text=\u00bb2026-Gonzalez-Delgado-et-al-MPB\u00bb alt=\u00bbPortada: Ocean acidification drives grazer niche convergence and trophic homogenization in benthic communities\u00bb _builder_version=\u00bb4.9.7″ _module_preset=\u00bbdefault\u00bb border_width_all=\u00bb2px\u00bb border_color_all=\u00bb#0C997F\u00bb][\/et_pb_image][\/et_pb_column][et_pb_column type=\u00bb3_5″ _builder_version=\u00bb4.9.7″ _module_preset=\u00bbdefault\u00bb][et_pb_text _builder_version=\u00bb4.9.7″ _module_preset=\u00bbdefault\u00bb] 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fb_built=\u00bb1″ _builder_version=\u00bb4.9.7″ _module_preset=\u00bbdefault\u00bb][et_pb_row _builder_version=\u00bb4.9.7″ _module_preset=\u00bbdefault\u00bb][et_pb_column type=\u00bb4_4″ _builder_version=\u00bb4.9.7″ _module_preset=\u00bbdefault\u00bb][et_pb_text _builder_version=\u00bb4.9.7″ _module_preset=\u00bbdefault\u00bb header_2_font=\u00bb|700|||||||\u00bb] Ocean acidification drives grazer niche convergence and trophic homogenization in benthic communities [\/et_pb_text][\/et_pb_column][\/et_pb_row][et_pb_row column_structure=\u00bb2_5,3_5″ _builder_version=\u00bb4.9.7″ _module_preset=\u00bbdefault\u00bb][et_pb_column type=\u00bb2_5″ _builder_version=\u00bb4.9.7″ _module_preset=\u00bbdefault\u00bb][et_pb_image src=\u00bbhttps:\/\/wp.ull.es\/omacc\/wp-content\/uploads\/sites\/110\/2026\/11\/Paper_webOMACC-4.png\u00bb title_text=\u00bb2026-Gonzalez-Delgado-et-al-MPB\u00bb alt=\u00bbPortada: Ocean acidification drives grazer niche convergence and trophic homogenization in 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