Land-sea ecological connectivity during a Jurassic warming event

• We analyse land-plant, plankton and benthos changes during a Jurassic warming event. observe strong ecological connectivity between terrestrial marine ecosystems. Plankton change controlled by the loss of trees, increasing runoff nutrients in coastal seas. Benthos affected resulting eutrophication anoxia. Knowledge on how climate affects land-sea deep time is scarce. To fill this knowledge gap we have assembled unique dataset through (early Toarcian) event that includes quantitative abundance data from pollen spores, organic-walled benthic macro-invertebrates, association with geochemical derived same sampled horizons, Cleveland Basin, UK. Using we: (i) reconstruct timing degradation recovery land-plants, primary producers fauna response to event, (ii) test for land find discrepancy land-plant ecosystems Land-plants were first be initial warming, but also recovered relatively quickly after peak warmth return pre-event levels richness diversity. instead experienced delayed as peaked, they suffered rapid extreme turnover. Recovery shelf sea was (particularly benthos) compared vegetation. Ecological analyses show link The large trees contributed plankton, dinoflagellate- prasinophyte algal-dominated communities, enhancing erosion, nutrient-supply into shallow Eutrophication productivity decrease dissolved oxygen water column bottom waters, which turn communities. Such cause-effect mechanisms observed Basin are likely occurred other basins Boreal Realm, part Sub-Boreal Tethyan realms. Although palaeolatitudinal palaeoceanographic gradients may local regional land-plants Early Jurassic, main climatic environmental linked global enhanced weathering high productivity, shared among all examined