Population niche breadth and individual trophic specialisation of fish along a climate-productivity gradient

AbstractA mechanistic understanding of how environmental change affects trophic ecology of fish at the individual and population level remains elusive. To address this, we conducted a space-for-time approach incorporating environmental gradients (temperature, precipitation and nutrients), lake morphometry (visibility, depth and area), fish communities (richness, competition and predation), prey availability (richness and density) and feeding (population niche breadth and individual trophic specialisation) for 15 native fish taxa belonging to different thermal guilds from 35 subarctic lakes along a marked climate-productivity gradient corresponding to future climate change predictions. We revealed significant and contrasting responses from two generalist species that are abundant and widely distributed in the region. The cold-water adapted European whitefish (Coregonus lavaretus) reduced individual specialisation in warmer and more productive lakes. Conversely, the cool-water adapted Eurasian perch (Perca fluviatilis) showed increased levels of individual specialism along climate-productivity gradient. Although whitefish and perch differed in the way they consumed prey along the climate-productivity gradient, they both switched from consumption of zooplankton in cooler, less productive lakes, to macrozoobenthos in warmer, more productive lakes. Species with specialist benthic or pelagic feeding did not show significant changes in trophic ecology along the gradient. We conclude that generalist consumers, such as warmer adapted perch, have clear advantages over colder and clear-water specialised species or morphs through their capacity to undergo reciprocal benthic–pelagic switches in feeding associated with environmental change. The capacity to show trophic flexibility in warmer and more productive lakes is likely a key trait for species dominance in future communities of high latitudes under climate change.

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Environmental Security and Climate Change

Oxford Research Encyclopedia of International Studies ◽

10.1093/acrefore/9780190846626.013.168 ◽

2010 ◽

Author(s):

Simon Dalby

Keyword(s):

Climate Change ◽

Environmental Change ◽

Security Policy ◽

Growth Failure ◽

Environmental Security ◽

Peace Building ◽

Future Climate Change ◽

Fragile States ◽

Earth System ◽

The Earth

Environmental security focuses on the ecological conditions necessary for sustainable development. It encompasses discussions of the relationships between environmental change and conflict as well as the larger global policy issues linking resources and international relations to the necessity for doing both development and security differently. Climate change has become an increasingly important part of the discussion as its consequences have become increasingly clear. What is not at all clear is in what circumstances climate change may turn out to be threat multiplier leading to conflict. Earth system science findings and the recognition of the scale of human transformations of nature in what is understood in the 21st century to be a new geological epoch, the Anthropocene, now require environmental security to be thought of in terms of preventing the worst dangers of fragile states being unable to cope with the stresses caused by rapid environmental change or perhaps the economic disruptions caused by necessary transitions to a post fossil fueled economic system. But so far, at least, this focus on avoiding the worst consequences of future climate change has not displaced traditional policies of energy security that primarily ensure supplies of fossil fuels to power economic growth. Failure to make this transition will lead to further rapid disruptions of climate and add impetus to proposals to artificially intervene in the earth system using geoengineering techniques, which might in turn generate further conflicts from states with different interests in how the earth system is shaped in future. While the Paris Agreement on Climate Change recognized the urgency of tackling climate change, the topic has not become security policy priority for most states, nor yet for the United Nations, despite numerous policy efforts to securitize climate change and instigate emergency responses to deal with the issue. More optimistic interpretations of the future suggest possibilities of using environmental actions to facilitate peace building and a more constructive approach to shaping earth’s future.

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Modeling Future Potential Distribution of Buff-Bellied Hummingbird (Amazilia yucatanensis) Under Climate Change: Species vs. Subspecies

Tropical Conservation Science ◽

10.1177/19400829211030834 ◽

2021 ◽

Vol 25 ◽

pp. 194008292110308

Author(s):

Antonio Acini Vásquez-Aguilar ◽

Juan Francisco Ornelas ◽

Flor Rodríguez-Gómez ◽

M. Cristina MacSwiney G.

Keyword(s):

Climate Change ◽

Potential Distribution ◽

Niche Breadth ◽

Future Climate ◽

Extreme Weather Events ◽

Future Climate Change ◽

Climate Change Scenarios ◽

Climatic Niche ◽

Future Projections ◽

Change Models

Global climate change is associated with changes in precipitation patterns and an increase in extreme weather events, which might shift the geographic distribution of species. Despite the importance of this topic, information is lacking for many species, particularly tropical birds. Here, we developed species distribution models (SDMs) to evaluate future projections of the distribution of the widespread Buff-bellied Hummingbird ( Amazilia yucatanensis) and for each of the recognized subspecies ( A. y. yucatanensis, A. y. cerviniventris, A. y. chalconota), under climate change scenarios. Using SDMs we evaluate current and future projections of their potential distribution for four Representative Concentration Pathway (RCPs) for the years 2050 and 2070. We also calculated the subspecies climatic niche breadth to test the relationship between their area of distribution and climatic niche breadth and their niche overlap. Future climate-change models suggested a small increase in the potential distribution of the species and the subspecies A. y. yucatanensis, but the predicted potential geographic range decreased in A. y. chalconota and remained unaffected in A. y. cerviniventris. The climatic niche of A. y. cerviniventris contained part niche space of A. y. yucatanensis and part of A. y. chalconota, but the climatic niches of A. y. yucatanensis and A. y. chalconota did not overlap. Our study highlights the importance of correctly choosing the taxonomic unit to be analyzed because subspecies will respond in a different manner to future climate change; therefore, conservation actions must consider intrinsic requirements of subspecies and the environmental drivers that shape their distributions.

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Spatial and Temporal Downscaling of Atmospheric Components from GCMs for Historical Reconstruction and/or for Future Climate Change Study

World Environmental and Water Resources Congress 2012 ◽

10.1061/9780784412312.198 ◽

2012 ◽

Cited By ~ 2

Author(s):

S. Kure ◽

S. Jang ◽

N. Ohara ◽

M. L. Kavvas ◽

G. Matanga ◽

...

Keyword(s):

Climate Change ◽

Future Climate ◽

Future Climate Change ◽

Historical Reconstruction ◽

Climate Change Study

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What we can learn from the parallels between the COVID-19 and the future climate change crises

10.32942/osf.io/eg6hr ◽

2020 ◽

Author(s):

Rubén D. Manzanedo ◽

Peter Manning

Keyword(s):

Climate Change ◽

Global Economy ◽

Global Climate ◽

Future Climate Change ◽

Substantial Portion ◽

Preventative Measures ◽

The Future ◽

Behavioral Norm ◽

Climate Crisis ◽

Global Population

The ongoing COVID-19 outbreak pandemic is now a global crisis. It has caused 1.6+ million confirmed cases and 100 000+ deaths at the time of writing and triggered unprecedented preventative measures that have put a substantial portion of the global population under confinement, imposed isolation, and established ‘social distancing’ as a new global behavioral norm. The COVID-19 crisis has affected all aspects of everyday life and work, while also threatening the health of the global economy. This crisis offers also an unprecedented view of what the global climate crisis may look like. In fact, some of the parallels between the COVID-19 crisis and what we expect from the looming global climate emergency are remarkable. Reflecting upon the most challenging aspects of today’s crisis and how they compare with those expected from the climate change emergency may help us better prepare for the future.

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