Algae community response to climate change and nutrient loading recorded by sedimentary phytoplankton pigments in the Changtan Reservoir, China

Abstract The fisheries sector is crucial to the Bangladeshi economy and wellbeing, accounting for 4.4% of national gross domestic product and 22.8% of agriculture sector production, and supplying ca. 60% of the national animal protein intake. Fish is vital to the 16 million Bangladeshis living near the coast, a number that has doubled since the 1980s. Here, we develop and apply tools to project the long-term productive capacity of Bangladesh marine fisheries under climate and fisheries management scenarios, based on downscaling a global climate model, using associated river flow and nutrient loading estimates, projecting high-resolution changes in physical and biochemical ocean properties, and eventually projecting fish production and catch potential under different fishing mortality targets. We place particular interest on Hilsa shad (Tenualosa ilisha), which accounts for ca. 11% of total catches, and Bombay duck (Harpadon nehereus), a low price fish that is the second highest catch in Bangladesh and is highly consumed by low-income communities. It is concluded that the impacts of climate change, under greenhouse emissions scenario A1B, are likely to reduce the potential fish production in the Bangladesh exclusive economic zone by <10%. However, these impacts are larger for the two target species. Under sustainable management practices, we expect Hilsa shad catches to show a minor decline in potential catch by 2030 but a significant (25%) decline by 2060. However, if overexploitation is allowed, catches are projected to fall much further, by almost 95% by 2060, compared with the Business as Usual scenario for the start of the 21st century. For Bombay duck, potential catches by 2060 under sustainable scenarios will produce a decline of <20% compared with current catches. The results demonstrate that management can mitigate or exacerbate the effects of climate change on ecosystem productivity.

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Climate Change and Nutrient Loading in the Western Lake Erie Basin: Warming Can Counteract a Wetter Future

Environmental Science & Technology ◽

10.1021/acs.est.9b01274 ◽

2019 ◽

Vol 53 (13) ◽

pp. 7543-7550 ◽

Cited By ~ 11

Author(s):

Margaret M. Kalcic ◽

Rebecca Logsdon Muenich ◽

Samantha Basile ◽

Allison L. Steiner ◽

Christine Kirchhoff ◽

...

Keyword(s):

Climate Change ◽

Lake Erie ◽

Nutrient Loading ◽

Western Lake ◽

Western Lake Erie

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Monitoring as a community response for climate change and health

International Journal of Circumpolar Health ◽

10.3402/ijch.v64i5.18024 ◽

2005 ◽

Vol 64 (5) ◽

pp. 440-441 ◽

Cited By ~ 2

Author(s):

Christopher M. Furgal

Keyword(s):

Climate Change ◽

Community Response ◽

Climate Change And Health

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Long-Term (2001–2020) Nutrient Transport from a Small Boreal Agricultural Watershed: Hydrological Control and Potential of Retention Ponds

Water ◽

10.3390/w12102731 ◽

2020 ◽

Vol 12 (10) ◽

pp. 2731

Author(s):

Sari Uusheimo ◽

Tiina Tulonen ◽

Jussi Huotari ◽

Lauri Arvola

Keyword(s):

Climate Change ◽

Total Nitrogen ◽

Total Phosphorus ◽

Nutrient Loading ◽

Nitrogen Loading ◽

Agricultural Watershed ◽

Weather Data ◽

Pond System ◽

Daily Weather Data

Agriculture contributes significantly to phosphorus and nitrogen loading in southern Finland. Climate change with higher winter air temperatures and precipitation may also promote loading increase further. We analyzed long-term nutrient trends (2001–2020) based on year-round weekly water sampling and daily weather data from a boreal small agricultural watershed. In addition, nutrient retention was studied in a constructed sedimentation pond system for two years. We did not find any statistically significant trends in weather conditions (temperature, precipitation, discharge, snow depth) except for an increase in discharge in March. Increasing trends in annual concentrations were found for nitrate, phosphate, and total phosphorus and total nitrogen. In fact, phosphate concentration increased in every season and nitrate concentration in other seasons except in autumn. Total phosphorus and total nitrogen concentrations increased in winter as well and total phosphorus also in summer. Increasing annual loading trend was found for total phosphorus, phosphate, and nitrate. Increasing winter loading was found for nitrate and total nitrogen, but phosphate loading increased in winter, spring, and summer. In the pond system, annual retention of total nitrogen was 1.9–4.8% and that of phosphorus 4.3–6.9%. In addition, 25–40% of suspended solids was sedimented in the ponds. Our results suggest that even small ponds can be utilized to decrease nutrient and material transport, but their retention efficiency varies between years. We conclude that nutrient loading from small boreal agricultural catchments, especially in wintertime, has already increased and is likely to increase even further in the future due to climate change. Thus, the need for new management tools to reduce loading from boreal agricultural lands becomes even more acute.

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Soil heterogeneity buffers community response to climate change in species-rich grassland

Global Change Biology ◽

10.1111/j.1365-2486.2010.02347.x ◽

2010 ◽

Vol 17 (5) ◽

pp. 2002-2011 ◽

Cited By ~ 78

Author(s):

JASON D. FRIDLEY ◽

J. PHILIP GRIME ◽

ANDREW P. ASKEW ◽

BARBARA MOSER ◽

CARLY J. STEVENS

Keyword(s):

Climate Change ◽

Soil Heterogeneity ◽

Community Response

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Management criteria for lake ecosystems applied to case studies of changes in nutrient loading and climate change

Lakes & Reservoirs Research & Management ◽

10.1046/j.1320-5331.2003.00216.x ◽

2003 ◽

Vol 8 (2) ◽

pp. 141-155 ◽

Cited By ~ 8

Author(s):

Lars Håkanson ◽

Alexander Ostapenia ◽

Arkady Parparov ◽

K. David Hambright ◽

Viktor V. Boulion

Keyword(s):

Climate Change ◽

Case Studies ◽

Nutrient Loading ◽

Lake Ecosystems

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North-South asymmetry in the modeled phytoplankton community response to climate change over the 21st century

Global Biogeochemical Cycles ◽

10.1002/2013gb004599 ◽

2013 ◽

Vol 27 (4) ◽

pp. 1274-1290 ◽

Cited By ~ 27

Author(s):

Irina Marinov ◽

Scott C. Doney ◽

Ivan D. Lima ◽

K. Lindsay ◽

J. K. Moore ◽

...

Keyword(s):

Climate Change ◽

21St Century ◽

Phytoplankton Community ◽

Community Response ◽

South Asymmetry

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Whole plant community transplants across climates reveal structural community stability due to large shifts in species assemblage

10.1101/475046 ◽

2018 ◽

Author(s):

Sara Tomiolo ◽

Mark C. Bilton ◽

Katja Tielbörger

Keyword(s):

Climate Change ◽

Plant Communities ◽

Plant Density ◽

Eastern Mediterranean ◽

Rainfall Variability ◽

Climatic Conditions ◽

Community Response ◽

Community Stability ◽

Species Abundances ◽

Mediterranean Regions

Summary(1) Climate change will decrease precipitation and increase rainfall variability in Eastern Mediterranean regions, with responses of plant communities largely uncertain. Here, we tested short-term responses of dryland plant communities to contrasting rainfall regimes using a novel experimental approach.(2) We exposed three annual plant communities to sharp changes in climatic conditions using whole community reciprocal transplants of soil and seed banks. We tested for the role of climate vs. community origin on community response and resistance. In parallel, we asked whether origin-specific climatic adaptations predict compositional shifts across climates.(3) For both community origins, the most dry-adapted species in each community increased in dry climate and the wet-adapted species increased in wet climate. Dry community origins showed large compositional shifts while maintaining stable plant density, biomass and species richness across climates. Conversely, wet communities showed smaller compositional shifts, but larger variation in biomass and richness.(4) Asynchrony in species abundances in response to rainfall variability could maintain structural community stability. This, in combination with seed dormancy, has the ability to delay extinction in response to climate change. However, increasing occurrence of extreme droughts may, in the long-term, lead to loss of wet-adapted species.

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Root pathogen diversity and composition varies with climate in undisturbed grasslands, but less so in anthropogenically disturbed grasslands

The ISME Journal ◽

10.1038/s41396-020-00783-z ◽

2020 ◽

Vol 15 (1) ◽

pp. 304-317 ◽

Cited By ~ 1

Author(s):

Camille S. Delavaux ◽

Josh L. Schemanski ◽

Geoffrey L. House ◽

Alice G. Tipton ◽

Benjamin Sikes ◽

...

Keyword(s):

Climate Change ◽

Plant Community ◽

Plant Pathogen ◽

Fungal Pathogens ◽

Community Response ◽

Community Diversity ◽

Plant Responses ◽

Native Plant ◽

The Impact ◽

Precipitation And Temperature

AbstractSoil-borne pathogens structure plant communities, shaping their diversity, and through these effects may mediate plant responses to climate change and disturbance. Little is known, however, about the environmental determinants of plant pathogen communities. Therefore, we explored the impact of climate gradients and anthropogenic disturbance on root-associated pathogens in grasslands. We examined the community structure of two pathogenic groups—fungal pathogens and oomycetes—in undisturbed and anthropogenically disturbed grasslands across a natural precipitation and temperature gradient in the Midwestern USA. In undisturbed grasslands, precipitation and temperature gradients were important predictors of pathogen community richness and composition. Oomycete richness increased with precipitation, while fungal pathogen richness depended on an interaction of precipitation and temperature, with precipitation increasing richness most with higher temperatures. Disturbance altered plant pathogen composition and precipitation and temperature had a reduced effect on pathogen richness and composition in disturbed grasslands. Because pathogens can mediate plant community diversity and structure, the sensitivity of pathogens to disturbance and climate suggests that degradation of the pathogen community may mediate loss, or limit restoration of, native plant diversity in disturbed grasslands, and may modify plant community response to climate change.

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