scholarly journals Emergence of climate change signals in marine ecosystem thermal niches

2021 ◽  
Author(s):  
Yeray Santana-Falcón ◽  
Roland Seferian
Keyword(s):  
Climate Change ◽  
Marine Ecosystem ◽  
Marine Species ◽  
Global Ocean ◽  
Marine Habitats ◽  
Daily Data ◽  
Subsurface Waters ◽  
Complex Picture ◽  
The Impact ◽  
Vertical Level

Abstract Temperature is one of the most important drivers of global ocean patterns of biodiversity1,2,3 shaping thermal niches through thresholds of physiological thermal tolerance4⁠. Because of anthropogenic global warming, lower and upper thermal niche bounds are predicted to change affecting the future distribution of marine species5,6⁠. Current working hypotheses suggest an expansion of ectotherms toward their poleward boundaries7,8. Nonetheless, the knowledge of the timing and extent of these rearrangements across latitude and depth remains limited. Here, using daily data across the water column from both Ocean Sites network observations and novel Earth System Model, we track the emergence of thermal niches whose lower bound is warmer than their current upper bound, potentially disrupting marine habitats. We show that these developments will emerge by ~2030 in subsurface waters (~50 – 1000 m) if anthropogenic emissions continue to rise, whereas they delay several decades if emissions are substantially reduced. By 2100, thermal niches will be warmer than current counterparts. However, we further show that depending on the vertical level, concomitant changes in both boundaries will result in wider or narrower thermal niches. These results suggest that the redistribution of marine species might differ across depth, shedding light upon a much more complex picture of the impact of climate change on marine habitats.

Impact of biogeochemistry feedbacks on the projected climate change signal over the Indian Continent

2020 ◽  
Author(s):  
Dmitry Sein ◽  
William Cabos ◽  
Pankaj Kumar ◽  
Vladimir Ryabchenko ◽  
Stanislav Martyanov ◽  
...  
Keyword(s):  
Climate Change ◽  
Marine Ecosystem ◽  
Regional Model ◽  
Ocean Model ◽  
Global Ocean ◽  
Future Climate Change ◽  
Climate Change Signal ◽  
Water Type ◽  
Substantial Impact ◽  
The Impact

<p>There are few studies dedicated to assessing the impact of biogeochemistry feedbacks on the climate change signal. In this study, we evaluate this impact in a future climate change scenario over the Indian subcontinent with the coupled regional model ROM in the Indian CORDEX area.In ROM a global ocean model (MPIOM) with regionally high horizontal resolution (up to 15 km resolution in the Bay of Bengal) is coupled to an atmospheric regional model (REMO, with 25 km resolution) and global terrestrial hydrology model. The ocean and the atmosphere are interacting within the region covered by the atmospheric domain. Outside this domain, the ocean model is not coupled to the atmosphere, being driven by prescribed atmospheric forcing, thus running in so-called stand-alone mode.</p><p>To assess the impact of biogeochemical feedbacks on the climate change signal, we compare two simulations with ROM. In both simulations, the model is driven by data from a climate change simulation under the RCP 8.5 scenario with the MPI-ESM global model and differ only in the activation of the biochemistry module of MPIOM. In the first simulation, we use a light attenuation parameterization based on the Jerlov water types, when the attenuation coefficient varies spatially depending on the water type specified but does not vary in time. In the second simulation, we introduce the biochemical feedbacks as implemented in the global ocean biogeochemistry model HAMOCC.  </p><p>Both simulations capture the main features of the present time atmospheric and oceanic variability in the region and the model with HAMOCC reproduces well the intra-annual dynamics of the marine ecosystem in the northern Indian Ocean.</p><p>A comparison of the simulated changes in atmospheric variables shows that the feedbacks have a substantial impact on the climate change signal for precipitation and air temperature, especially over the central Indian region.</p><p>Acknowledgement: The work was supported by the Russian Science Foundation (Project 19-47-02015) and Indian project no. DST/INT/RUS/RSF/P-33/G.</p>

scholarly journals Ensemble projections of global ocean animal biomass with climate change

2018 ◽  
Author(s):  
Heike K. Lotze ◽  
Derek P. Tittensor ◽  
Andrea Bryndum-Buchholz ◽  
Tyler D. Eddy ◽  
William W. L. Cheung ◽  
...  
Keyword(s):  
Climate Change ◽  
Marine Ecosystem ◽  
Marine Species ◽  
Global Ocean ◽  
Earth System ◽  
System Models ◽  
Climate Change Effects ◽  
Marine Ecosystem Models ◽  
Earth System Models ◽  
Ensemble Projections

AbstractClimate change is shifting the abundance and distribution of marine species with consequences for ecosystem functioning, seafood supply, management and conservation. Several approaches for future projection exist but these have never been compared systematically to assess their variability. We conducted standardized ensemble projections including 6 global fisheries and marine ecosystem models, forced with 2 Earth-system models and 4 emission scenarios in a fished and unfished ocean, to derive average trends and associated uncertainties. Without fishing, mean global animal biomass decreased by 5% (±4%) under low and 17% (±11%) under high emissions by 2100, primarily driven by increasing temperature and decreasing primary production. These climate-change effects were slightly weaker for larger animals and in a fished ocean. Considerable regional variation ranged from strong biomass increases in high latitudes to strong decreases in mid-low latitudes, with good model agreement on the direction of change but variable magnitude. Uncertainties due to differences among ecosystem or Earth-system models were similar, suggesting equal need for model improvement. Our ensemble projections provide the most comprehensive outlook on potential climate-driven ecological changes in the ocean to date. Realized future trends will largely depend on how fisheries and management adapt to these changes in a changing climate.

Detecting Climate Fingerprints in Southern Ocean Carbon using a Biogeochemical Ocean Model

2021 ◽  
Author(s):  
Rebecca Wright ◽  
Corinne Le Quéré ◽  
Erik Buitenhuis ◽  
Dorothee Bakker
Keyword(s):  
Climate Change ◽  
Climate Variability ◽  
Southern Ocean ◽  
Observational Data ◽  
Ecosystem Dynamics ◽  
Global Ocean ◽  
Subsurface Waters ◽  
Climatic Drivers ◽  
Ocean Carbon ◽  
And Storage

<p>The Southern Ocean plays an important role in the uptake, transport and storage of carbon by the global oceans. These properties are dominated by the response to the rise in anthropogenic CO<sub>2</sub> in the atmosphere, but they are modulated by climate variability and climate change. Here we explore the effect of climate variability and climate change on ocean carbon uptake and storage in the Southern Ocean. We assess the extent to which climate change may be distinguishable from the anthropogenic CO<sub>2</sub> signal and from the natural background variability. We use a combination of biogeochemical ocean modelling and observations from the GLODAPv2020 database to detect climate fingerprints in dissolved inorganic carbon (DIC).</p><p>We conduct an ensemble of hindcast model simulations of the period 1920-2019, using a global ocean biogeochemical model which incorporates plankton ecosystem dynamics based on twelve plankton functional types. We use the model ensemble to isolate the changes in DIC due to rising anthropogenic CO<sub>2</sub> alone and the changes due to climatic drivers (both climate variability and climate change), to determine their relative roles in the emerging total DIC trends and patterns. We analyse these DIC trends for a climate fingerprint over the past four decades, across spatial scales from the Southern Ocean, to basin level and down to regional ship transects. Highly sampled ship transects were extracted from GLODAPv2020 to obtain locations with the maximum spatiotemporal coverage, to reduce the inherent biases in patchy observational data. Model results were sampled to the ship transects to compare the climate fingerprints directly to the observational data.</p><p>Model results show a substantial change in DIC over a 35-year period, with a range of more than +/- 30 µmol/L. In the surface ocean, both anthropogenic CO<sub>2</sub> and climatic drivers act to increase DIC concentration, with the influence of anthropogenic CO<sub>2</sub> dominating at lower latitudes and the influence of climatic drivers dominating at higher latitudes. In the deep ocean, the anthropogenic CO<sub>2</sub> generally acts to increase DIC except in the subsurface waters at lower latitudes, while climatic drivers act to decrease DIC concentration. The combined fingerprint of anthropogenic CO<sub>2</sub> and climatic drivers on DIC concentration is for an increasing trend at the surface and decreasing trends in low latitude subsurface waters. Preliminary comparison of the model fingerprints to observational ship transects will also be presented.</p>

The Impact of Regional Climate Change on the Marine Ecosystem of the Western Antarctic Peninsula

2012 ◽  
pp. 91-120 ◽  
Author(s):  
Andrew Clarke ◽  
David K. A. Barnes ◽  
Thomas J. Bracegirdle ◽  
Hugh W. Ducklow ◽  
John C. King ◽  
...  
Keyword(s):  
Climate Change ◽  
Antarctic Peninsula ◽  
Regional Climate ◽  
Marine Ecosystem ◽  
Regional Climate Change ◽  
Western Antarctic Peninsula ◽  
The Impact

Seafood through time: changes in biomass, energetics, and productivity in the marine ecosystem

Paleobiology ◽  
1993 ◽  
Vol 19 (3) ◽  
pp. 372-397 ◽  
Author(s):  
Richard K. Bambach
Keyword(s):  
Food Supply ◽  
Full Range ◽  
Marine Ecosystem ◽  
Time Lag ◽  
General Level ◽  
Marine Habitats ◽  
Time Changes ◽  
Modes Of Life ◽  
Average Size ◽  
The Impact

The biomass of marine consumers increased during the Phanerozoic. This is indicated by the increase in both fleshiness and average size of individuals of dominant organisms, coupled with the conservative estimate that dominant organisms in the Cenozoic are at least as abundant as those in the Paleozoic. As faunal dominants replaced one another during the Phanerozoic the general level of metabolic activity increased due to both increase in basal metabolism and increase in more energetic modes of life. This demonstrates that the expenditure of energy by marine consumers has increased with time as well. There is a time lag in the expansion of more energetic life habits from environmental settings known to have high food supply into regions expected to have lower rates of food supply (e.g., bivalves into offshore carbonate environments or deep burrowing deposit feeders into the full range of shelf environments), and a time lag in diversification of energetic modes of life (e.g., predation or deep burrowing deposit feeding) for long intervals after they first appeared. This suggests that the supply of food increased across the whole spectrum of marine habitats during the Phanerozoic. The great diversification of specialized predators especially suggests that biomass increase took place all the way down the food chain to the level of primary production. The development of plant life on land and the impact of land vegetation on stimulating productivity in coastal marine settings, coupled with the transfer of organic material and nutrients from coastal regions to the open ocean, and the increase through time in diversity and abundance of oceanic phytoplankton all point to increased productivity in the oceans through the Phanerozoic.

scholarly journals Marine bioinvasions: bivalve molluscs introduced in northeast Brazil

2021 ◽  
Vol 6 (1) ◽  
pp. 507-526
Author(s):  
Luan Lucas Cardoso Lima ◽  
Flávio Dias Passos
Keyword(s):  
Web Of Science ◽  
Marine Ecosystem ◽  
Marine Species ◽  
Environmental Conservation ◽  
Northeastern Brazil ◽  
Ecosystem Ecology ◽  
Bivalve Molluscs ◽  
Invasive Bivalves ◽  
The Status ◽  
The Impact

ABSTRACT: Invasive alien species are those that, once introduced from other environments, adapt, starting to reproduce and proliferate in places they did not previously inhabit. The introduction of exotic marine species as a result of anthropic activity, whether intentionally or not, is a process that has been remote for centuries, which makes it difficult to assess the impact of these activities, making studies that address the status of knowledge about such organisms always important. Thus, this research aims to gather information about bivalve molluscs introduced into marine ecosystems in northeastern Brazil, in addition to discussing the knowledge of this invasive fauna for the Northeast, Southeast and South regions of Brazil. For that there was a search for bibliography in 5 databases - SciELO, Web of Science, Google Scholar, ScienceResearch.com and I3N Brazil Database of the Horus Institute for Environmental Conservation and Development. Three invasive bivalves for the northeastern region of Brazil were counted. When compared to the South and Southeast regions, the Northeast presents a significant amount of research on the ecology of the species Isognomon bicolor (C. B. Adams, 1845) and Mytilopsis leucophaeata (Conrad, 1831), which is very important, because with these results it is possible to track and understand the pathways that make bioinvasions possible. Regarding Perna Perna (Linnaeus, 1758), although there is a discussion about its supposed introduction in Brazilian waters, the species can be considered invasive in Northeastern Brazil. KEYWORDS: Invasive species, marine ecosystem, ecology.

scholarly journals Towards new online access services for the EMSO ERIC temperature and salinity data

2020 ◽  
Author(s):  
Alice Novello ◽  
Dominique Lefevre ◽  
Nadia LoBue ◽  
Ivan Rodero ◽  
Raul Bardaji ◽  
...  
Keyword(s):  
Climate Change ◽  
Water Column ◽  
Marine Ecosystem ◽  
Relevant Information ◽  
The Black Sea ◽  
Global Issues ◽  
Online Tools ◽  
Salinity Data ◽  
The Many ◽  
The Impact

<p>The European Multidisciplinary Seafloor and water column Observatory (EMSO) consists, to date, of 11 regional multiple sensor-equipped platforms distributed around Europe from the Atlantic Ocean to the Mediterranean, and the Black Sea. Each system collects multidisciplinary measurements in the water column as well as at the seafloor addressing several critical questions related to ocean health, climate change, marine ecosystems and natural hazards. EMSO is a European Research Infrastructure Consortium (ERIC) since 2016, and one of the many challenges has been to design new online services promoting marine data produced by the whole network. Here, we report on an on-going activity to compile, control and deliver quality controlled temperature and salinity data and metadata gathered through the EMSO network from the sea surface down to 4000m. As part of this effort, we work on the development of online tools for temperature and salinity data visualization and knowledge discovery based on widely used software components such as dashboards. These services aim to support the stakeholders' needs (from scientists and industries to institutions and policymakers) by providing relevant information on multidisciplinary oceanographic data. They also highlight the importance of filling the knowledge gap on the abyssal ocean by delivering useful deep long-term series necessary to assess the impact of key processes on global issues such as climate change and marine ecosystem sustainability.</p>

scholarly journals Viviparous sea snakes can be used as bioindicators for diverse marine environments

2021 ◽  
Vol 14 (2) ◽  
Keyword(s):  
Climate Change ◽  
Marine Ecosystem ◽  
Habitat Destruction ◽  
Anthropogenic Pressure ◽  
Marine Habitat ◽  
Marine Fauna ◽  
Anthropogenic Changes ◽  
Sea Snakes ◽  
Marine Habitats ◽  
Set Up

Shallow tropical marine ecosystems are under great anthropogenic pressure due to habitat destruction, overfishing, shrimping, climate change, and tourism. This is an issue of global concern as such environments hold a tremendous biodiversity much of which remains to be described. The present situation urgently calls for time- and resource-efficient methods to identify and delineate the most valuable remaining areas and to set up priorities for their management and conservation. Using indicator species can be a way to accomplish this goal. In this paper we evaluate whether viviparous sea snakes can serve as bioindicators for other rare or cryptic tropical marine fauna. Based on seven generally acknowledged criteria for bioindicators, we argue that using viviparous sea snakes as bioindicators can help monitoring marine habitats to gauge the effects of climate change, habitat change and loss, decline in biodiversity and other anthropogenic changes. However, to maximize their efficacy as bioindicators, deeper knowledge about viviparous sea snakes natural history is urgently needed. Topics for expanded research programs include the taxonomy of some groups, their breeding and feeding biology, habitat selection and their geographical distribution. Despite these gaps in our understanding, we argue that viviparous sea snakes can be utilized as bioindicators of marine ecosystem health. KEYWORDS: anthropogenic changes, conservation, herpetology, marine habitat, monitoring

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