The changing status of invertebrate pests and the future of pest management in the Australian grains industry

2008 ◽  
Vol 48 (12) ◽  
pp. 1481 ◽  
Author(s):  
Ary A. Hoffmann ◽  
Andrew R. Weeks ◽  
Michael A. Nash ◽  
G. Peter Mangano ◽  
Paul A. Umina
Keyword(s):  
Climate Change ◽  
Management Practices ◽  
Genetically Modified Crops ◽  
Future Climate Change ◽  
Pesticide Use ◽  
Pest Species ◽  
Migratory Species ◽  
Cropping Patterns ◽  
Eastern Australia ◽  
Invertebrate Pests

The Australian grains industry is dealing with a shifting complex of invertebrate pests due to evolving management practices and climate change as indicated by an assessment of pest reports over the last 20–30 years. A comparison of pest outbreak reports from the early 1980s to 2006–07 from south-eastern Australia highlights a decrease in the importance of pea weevils and armyworms, while the lucerne flea, Balaustium mites, blue oat mites and Bryobia mites have increased in prominence. In Western Australia, where detailed outbreak records are available from the mid 1990s, the relative incidence of armyworms, aphids and vegetable weevils has recently decreased, while the incidence of pasture cockchafers, Balaustium mites, blue oat mites, redlegged earth mites, the lucerne flea and snails has increased. These changes are the result of several possible drivers. Patterns of pesticide use, farm management responses and changing cropping patterns are likely to have contributed to these shifts. Drier conditions, exacerbated by climate change, have potentially reduced the build-up of migratory species from inland Australia and increased the adoption rate of minimum and no-tillage systems in order to retain soil moisture. The latter has been accompanied by increased pesticide use, accelerating selection pressures for resistance. Other control options will become available once there is an understanding of interactions between pests and beneficial species within a landscape context and a wider choice of ‘softer’ chemicals. Future climate change will directly and indirectly influence pest distributions and outbreaks as well as the potential effectiveness of endemic natural enemies. Genetically modified crops provide new options for control but also present challenges as new pest species are likely to emerge.

Droughts, floods and freshwater ecosystems: evaluating climate change impacts and developing adaptation strategies

2011 ◽  
Vol 62 (3) ◽  
pp. 223 ◽  
Author(s):  
Allison Aldous ◽  
James Fitzsimons ◽  
Brian Richter ◽  
Leslie Bach
Keyword(s):  
Climate Change ◽  
Case Studies ◽  
Management Practices ◽  
Climate Adaptation ◽  
Numerical Models ◽  
Climate Change Impacts ◽  
Freshwater Ecosystems ◽  
Adaptation Strategies ◽  
South Eastern ◽  
Eastern Australia

Climate change is expected to have significant impacts on hydrologic regimes and freshwater ecosystems, and yet few basins have adequate numerical models to guide the development of freshwater climate adaptation strategies. Such strategies can build on existing freshwater conservation activities, and incorporate predicted climate change impacts. We illustrate this concept with three case studies. In the Upper Klamath Basin of the western USA, a shift in land management practices would buffer this landscape from a declining snowpack. In the Murray–Darling Basin of south-eastern Australia, identifying the requirements of flood-dependent natural values would better inform the delivery of environmental water in response to reduced runoff and less water. In the Savannah Basin of the south-eastern USA, dam managers are considering technological and engineering upgrades in response to more severe floods and droughts, which would also improve the implementation of recommended environmental flows. Even though the three case studies are in different landscapes, they all contain significant freshwater biodiversity values. These values are threatened by water allocation problems that will be exacerbated by climate change, and yet all provide opportunities for the development of effective climate adaptation strategies.

scholarly journals Groundwater Nitrate Contamination Integrated Modeling for Climate and Water Resources Scenarios: The Case of Lake Karla Over-Exploited Aquifer

Water ◽  
2019 ◽  
Vol 11 (6) ◽  
pp. 1201 ◽  
Author(s):  
Pantelis Sidiropoulos ◽  
Georgios Tziatzios ◽  
Lampros Vasiliades ◽  
Nikitas Mylopoulos ◽  
Athanasios Loukas
Keyword(s):  
Climate Change ◽  
Water Resources ◽  
Management Practices ◽  
Hydrological Modeling ◽  
Hydrological Cycle ◽  
Groundwater Resources ◽  
Future Climate Change ◽  
Agricultural Activity ◽  
Climate Change Scenarios ◽  
Modeling Tools

Groundwater quantity and quality degradation by agricultural practices is recorded as one of the most critical issues worldwide. This is explained by the fact that groundwater is an important component of the hydrological cycle, since it is a source of natural enrichment for rivers, lakes, and wetlands and constitutes the main source of potable water. The need of aquifers simulation, taking into account water resources components at watershed level, is imperative for the choice of appropriate restoration management practices. An integrated water resources modeling approach, using hydrological modeling tools, is presented for assessing the nitrate fate and transport on an over-exploited aquifer with intensive and extensive agricultural activity under various operational strategies and future climate change scenarios. The results indicate that climate change affects nitrates concentration in groundwater, which is likely to be increased due to the depletion of the groundwater table and the decrease of groundwater enrichment in the future water balance. Application of operational agricultural management practices with the construction and use of water storage infrastructure tend to compensate the groundwater resources degradation due to climate change impacts.

Mapping change in key soil properties due to climate change over south-eastern Australia

Soil Research ◽  
2019 ◽  
Vol 57 (5) ◽  
pp. 467 ◽  
Author(s):  
Jonathan M. Gray ◽  
Thomas F. A. Bishop
Keyword(s):  
Climate Change ◽  
Soil Properties ◽  
Management Practices ◽  
Climate Models ◽  
Carbon Accounting ◽  
Depth Interval ◽  
Soil Conditions ◽  
South Eastern ◽  
Eastern Australia ◽  
South Eastern Australia

Climate change will lead to altered soil conditions that will impact on plant growth in both agricultural and native ecosystems. Additionally, changes in soil carbon storage will influence carbon accounting schemes that may play a role in climate change mitigation programs. We applied a digital soil mapping approach to examine and map (at 100-m resolution) potential changes in three important soil properties – soil organic carbon (SOC), pH and sum-of-bases (common macro-nutrients) – resulting from projected climate change over south-eastern Australia until ~2070. Four global climate models were downscaled with three regional models to give 12 climate models, which were used to derive changes for the three properties across the province, at 0–30 and 30–100 cm depth intervals. The SOC stocks were projected to decline over the province, while pH and sum-of-bases were projected to increase; however, the extent of change varied throughout the province and with different climate models. The average changes primarily reflected the complex interplay of changing temperatures and rainfall throughout the province. The changes were also influenced by the operating environmental conditions, with a uniform pattern of change particularly demonstrated for SOC over 36 combinations of current climate, parent material and land use. For example, the mean decline of SOC predicted for the upper depth interval was 15.6 Mg ha–1 for wet–mafic–native vegetation regimes but only 3.1 Mg ha–1 for dry–highly siliceous–cropping regimes. The predicted changes reflected only those attributable to the projected climate change and did not consider the influence of ongoing and changing land management practices.

Changing windows of opportunity: past and future climate-driven shifts in temporal persistence of kingfish (Seriola lalandi) oceanographic habitat within south-eastern Australian bioregions

2019 ◽  
Vol 70 (1) ◽  
pp. 33 ◽  
Author(s):  
Curtis Champion ◽  
Alistair J. Hobday ◽  
Xuebin Zhang ◽  
Gretta T. Pecl ◽  
Sean R. Tracey
Keyword(s):  
Climate Change ◽  
Climate Adaptation ◽  
Relevant Information ◽  
Future Climate ◽  
Future Climate Change ◽  
South Eastern ◽  
Eastern Australia ◽  
Habitat Persistence ◽  
Temporal Persistence ◽  
Seriola Lalandi

Climate-driven shifts in species distributions are occurring rapidly within marine systems and are predicted to continue under climate change. To effectively adapt, marine resource users require information relevant to their activities at decision-making timescales. We model oceanographic habitat suitability for kingfish (Seriola lalandi) from south-eastern Australia using multiple environmental variables at monthly time steps over the period 1996–2040. Habitat predictions were used to quantify the temporal persistence (months per year) of suitable oceanographic habitat within six coastal bioregions. A decline in temporal habitat persistence is predicted for the northernmost (equatorward) bioregion, whereas increases are predicted for the three southernmost (poleward) bioregions. We suggest that temporal habitat persistence is an important metric for climate change adaptation because it provides fishery-relevant information. Our methods demonstrate how novel metrics relevant to climate adaptation can be derived from predictions of species’ environmental habitats, and are appropriate for the management of fisheries resources and protection of high conservation value species under future climate change.

scholarly journals Land use and climate change impacts on the hydrology of the upper Mara River Basin, Kenya: results of a modeling study to support better resource management

2011 ◽  
Vol 15 (7) ◽  
pp. 2245-2258 ◽  
Author(s):  
L. M. Mango ◽  
A. M. Melesse ◽  
M. E. McClain ◽  
D. Gann ◽  
S. G. Setegn
Keyword(s):  
Climate Change ◽  
Land Use ◽  
East Africa ◽  
River Basin ◽  
Management Practices ◽  
Cultural Landscapes ◽  
Dry Season ◽  
Future Climate Change ◽  
Climate Change Scenarios ◽  
Resource Managers

Abstract. Some of the most valued natural and cultural landscapes on Earth lie in river basins that are poorly gauged and have incomplete historical climate and runoff records. The Mara River Basin of East Africa is such a basin. It hosts the internationally renowned Mara-Serengeti landscape as well as a rich mixture of indigenous cultures. The Mara River is the sole source of surface water to the landscape during the dry season and periods of drought. During recent years, the flow of the Mara River has become increasingly erratic, especially in the upper reaches, and resource managers are hampered by a lack of understanding of the relative influence of different sources of flow alteration. Uncertainties about the impacts of future climate change compound the challenges. We applied the Soil Water Assessment Tool (SWAT) to investigate the response of the headwater hydrology of the Mara River to scenarios of continued land use change and projected climate change. Under the data-scarce conditions of the basin, model performance was improved using satellite-based estimated rainfall data, which may also improve the usefulness of runoff models in other parts of East Africa. The results of the analysis indicate that any further conversion of forests to agriculture and grassland in the basin headwaters is likely to reduce dry season flows and increase peak flows, leading to greater water scarcity at critical times of the year and exacerbating erosion on hillslopes. Most climate change projections for the region call for modest and seasonally variable increases in precipitation (5–10 %) accompanied by increases in temperature (2.5–3.5 °C). Simulated runoff responses to climate change scenarios were non-linear and suggest the basin is highly vulnerable under low (−3 %) and high (+25 %) extremes of projected precipitation changes, but under median projections (+7 %) there is little impact on annual water yields or mean discharge. Modest increases in precipitation are partitioned largely to increased evapotranspiration. Overall, model results support the existing efforts of Mara water resource managers to protect headwater forests and indicate that additional emphasis should be placed on improving land management practices that enhance infiltration and aquifer recharge as part of a wider program of climate change adaptation.

scholarly journals Temperature, but not pH, compromises sea urchin fertilization and early development under near-future climate change scenarios

2009 ◽  
Vol 276 (1663) ◽  
pp. 1883-1888 ◽  
Author(s):  
Maria Byrne ◽  
Melanie Ho ◽  
Paulina Selvakumaraswamy ◽  
Hong D. Nguyen ◽  
Symon A. Dworjanyn ◽  
...  
Keyword(s):  
Climate Change ◽  
Sea Urchin ◽  
Ocean Warming ◽  
Future Climate ◽  
Interactive Effects ◽  
Future Climate Change ◽  
Marine Biota ◽  
Climate Change Scenarios ◽  
Eastern Australia ◽  
Near Future

Global warming is causing ocean warming and acidification. The distribution of Heliocidaris erythrogramma coincides with the eastern Australia climate change hot spot, where disproportionate warming makes marine biota particularly vulnerable to climate change. In keeping with near-future climate change scenarios, we determined the interactive effects of warming and acidification on fertilization and development of this echinoid. Experimental treatments (20–26°C, pH 7.6–8.2) were tested in all combinations for the ‘business-as-usual’ scenario, with 20°C/pH 8.2 being ambient. Percentage of fertilization was high (>89%) across all treatments. There was no difference in percentage of normal development in any pH treatment. In elevated temperature conditions, +4°C reduced cleavage by 40 per cent and +6°C by a further 20 per cent. Normal gastrulation fell below 4 per cent at +6°C. At 26°C, development was impaired. As the first study of interactive effects of temperature and pH on sea urchin development, we confirm the thermotolerance and pH resilience of fertilization and embryogenesis within predicted climate change scenarios, with negative effects at upper limits of ocean warming. Our findings place single stressor studies in context and emphasize the need for experiments that address ocean warming and acidification concurrently. Although ocean acidification research has focused on impaired calcification, embryos may not reach the skeletogenic stage in a warm ocean.

Climate change and its impact on tea in Northeast India

2014 ◽  
Vol 5 (4) ◽  
pp. 625-632 ◽  
Author(s):  
Rishiraj Dutta
Keyword(s):  
Climate Change ◽  
Management Practices ◽  
Northeast India ◽  
Future Climate ◽  
Future Climate Change ◽  
Monthly Precipitation ◽  
Productivity Analysis ◽  
Climate Data ◽  
Tea Production ◽  
Production Period

The analysis of this study focused on the tea growing areas of Northeast India to provide predictions for future climate scenarios and its impact on tea production by 2050. The applied methodology involves a combination of current climate data with future climate change predictions from different models for 2050 as derived by WorldClim and IPCC4 (CIAT recommended). The results showed the possibility of an increase in average temperature by 2 °C in 2050, while not much variation is observed in the rainfall pattern. A change in tea production period is also expected by 2050 making tea planters look for alternative crops as an adaptive measure to keep the industry on its feet. With such expected impacts on tea production, the planters would need to make changes in their management practices to adapt to the evolving conditions and environment. In this study, the climate data were used as input to DIVA GIS Model. Monthly climate data were fed into Cranfield University Plantation Productivity Analysis for Tea Model (CUPPA Tea Model) to simulate observed and predicted yields. The study further shows that the overall climate will become less seasonal in terms of variation through the years followed by expected variations in monthly precipitation during the peak production months.

scholarly journals Modelling and mapping soil organic carbon stocks under future climate change in south-eastern Australia

Geoderma ◽  
2022 ◽  
Vol 405 ◽  
pp. 115442
Author(s):  
Bin Wang ◽  
Jonathan M. Gray ◽  
Cathy M. Waters ◽  
Muhuddin Rajin Anwar ◽  
Susan E. Orgill ◽  
...  
Keyword(s):  
Climate Change ◽  
Organic Carbon ◽  
Soil Organic Carbon ◽  
Carbon Stocks ◽  
Future Climate ◽  
Future Climate Change ◽  
South Eastern ◽  
Soil Organic Carbon Stocks ◽  
Eastern Australia ◽  
South Eastern Australia

scholarly journals Agritourism as a sustainable adaptation option for climate change

2019 ◽  
Vol 4 (1) ◽  
pp. 737-742
Author(s):  
R.P. Mahaliyanaarachchi ◽  
M.S. Elapata ◽  
M. Esham ◽  
B.C.H. Madhuwanthi
Keyword(s):  
Climate Change ◽  
Sri Lanka ◽  
Crop Production ◽  
Management Practices ◽  
Global Climate ◽  
Climate Extremes ◽  
Farming Systems ◽  
Adaptation Option ◽  
Climatic Effects ◽  
Cropping Patterns

AbstractThe global climate change has become one of the imperative issue for the smallholder dominated agriculture and tourism sectors in Sri Lanka. This study investigated the perception of farmers on climate change and the potential of agritourism as a sustainable adaptation option to mitigate the negative impacts of climate change in both tourism and agricultural sectors. The study was carried out in the low country dry zone (LCDZ) and the upcountry wet zone (UPWZ) of Sri Lanka. A survey strategy followed by structured and unstructured interviews were undertaken to collect the data. The sample was composed of 100 farmers each from the UPWZ and LCDZ respectively. The study revealed that there had been climate extremes in both climatic zones in terms of high rainfall and longer dry spells. Thus, it was important for the farmers to have necessary knowledge and skills on different diversification techniques related to crop-production, integrated farming systems and climate resilient production which are economical and mitigate the adverse climatic effects. However, the results revealed that the farmers have altered the cropping patterns and crop management practices rather than adopting entrepreneurial activities like agritourism. Lack of awareness of agritourism within the farming community is the main reason for farmers not contemplating this important diversification option. The results indicate that a significant number of farmers showed interest in considering agritourism as an option to mitigate climate change. It is important to educate farmers on diversification options.

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