scholarly journals Epidemic Growth Rates and Host Movement Patterns Shape Management Performance for Pathogen Spillover at The Wildlife-livestock Interface

2019 ◽  
Author(s):  
Kezia R. Manlove ◽  
Laura M. Sampson ◽  
Benny Borremans ◽  
E. Frances Cassirer ◽  
Ryan S. Miller ◽  
...  
Keyword(s):  
Growth Rates ◽  
Life Histories ◽  
Animal Health ◽  
Movement Patterns ◽  
Health Food ◽  
Management Options ◽  
Management Performance ◽  
Fast Growing ◽  
Management Actions ◽  
Host Movement

ABSTRACTManaging pathogen spillover at the wildlife-livestock interface is a key step toward improving global animal health, food security, and wildlife conservation. However, predicting the effectiveness of management actions across host-pathogen systems with different life histories is an on-going challenge since data on intervention effectiveness are expensive to collect and results are system-specific. We developed a simulation model to explore how the efficacies of different management strategies vary according to host movement patterns and epidemic growth rates. The model suggested that fast-growing, fast-moving epidemics like avian influenza were best-managed with actions like biosecurity or containment, which limited and localized overall spillover risk. For fast-growing, slower-moving diseases like foot-and-mouth disease, depopulation or prophylactic vaccination were competitive management options. Many actions performed competitively when epidemics grew slowly and host movements were limited, and how management efficacy related to epidemic growth rate or host movement propensity depended on what objective was used to evaluate management performance. This framework may be a useful step in advancing how we classify and prioritise responses to novel pathogen spillover threats, and evaluate current management actions for pathogens emerging at the wildlife-livestock interface.

scholarly journals Epidemic growth rates and host movement patterns shape management performance for pathogen spillover at the wildlife–livestock interface

2019 ◽  
Vol 374 (1782) ◽  
pp. 20180343 ◽  
Author(s):  
Kezia R. Manlove ◽  
Laura M. Sampson ◽  
Benny Borremans ◽  
E. Frances Cassirer ◽  
Ryan S. Miller ◽  
...  
Keyword(s):  
Growth Rates ◽  
Life Histories ◽  
Animal Health ◽  
Movement Patterns ◽  
Health Food ◽  
Management Options ◽  
Management Performance ◽  
Fast Growing ◽  
Management Actions ◽  
Host Movement

Managing pathogen spillover at the wildlife–livestock interface is a key step towards improving global animal health, food security and wildlife conservation. However, predicting the effectiveness of management actions across host–pathogen systems with different life histories is an on-going challenge since data on intervention effectiveness are expensive to collect and results are system-specific. We developed a simulation model to explore how the efficacies of different management strategies vary according to host movement patterns and epidemic growth rates. The model suggested that fast-growing, fast-moving epidemics like avian influenza were best-managed with actions like biosecurity or containment, which limited and localized overall spillover risk. For fast-growing, slower-moving diseases like foot-and-mouth disease, depopulation or prophylactic vaccination were competitive management options. Many actions performed competitively when epidemics grew slowly and host movements were limited, and how management efficacy related to epidemic growth rate or host movement propensity depended on what objective was used to evaluate management performance. This framework offers one means of classifying and prioritizing responses to novel pathogen spillover threats, and evaluating current management actions for pathogens emerging at the wildlife–livestock interface. This article is part of the theme issue ‘Dynamic and integrative approaches to understanding pathogen spillover’.

scholarly journals The effects of population synchrony, life history, and access constraints on benefits from fishing portfolios

2020 ◽  
Author(s):  
Kiva L. Oken ◽  
André E Punt ◽  
Daniel S. Holland
Keyword(s):  
Environmental Conditions ◽  
Life Histories ◽  
Oncorhynchus Tshawytscha ◽  
Environmental Drivers ◽  
Management Options ◽  
Population Synchrony ◽  
Natural Systems ◽  
Advantages And Disadvantages ◽  
Interannual Fluctuations ◽  
Short Time

Natural resources often exhibit large interannual fluctuations in productivity driven by shifting environmental conditions, and this translates to high variability in the revenue resource users can earn. However, users can dampen this variability by harvesting a portfolio of resources. In the context of fisheries, this means targeting multiple populations, though the ability to actually build diverse fishing portfolios is often constrained by the costs and availability of fishing permits. These constraints are generally intended to prevent overcapitalization of the fleet and ensure populations are fished sustainably. As linked human-natural systems, both ecological and fishing dynamics influence the specific advantages and disadvantages of increasing the diversity of fishing portfolios. Specifically, a portfolio of synchronous populations with similar responses to environmental drivers should reduce revenue variability less than a portfolio of asynchronous populations with opposite responses. We built a bioeconomic model characterized by the Dungeness crab (Metacarcinus magister), Chinook salmon (Oncorhynchus tshawytscha), and groundfish fisheries in the California Current, and used it to explore the influence of population synchrony and permit access on revenue patterns. As expected, synchronous populations reduced revenue variability less than asynchronous populations, but only for portfolios including crab and salmon. Synchrony with longer-lived groundfish populations was not important because environmentally-driven changes in groundfish early life survival were mediated by growth and natural mortality over the full population age structure, and overall biomass was relatively stable across years. Thus, building a portfolio of diverse life histories can buffer against the impacts of extremely poor environmental conditions over short time scales, though not for long-term declines. Increasing access to all permits generally led to increased revenue stability and decreased inequality of the fleet, but also resulted in less revenue earned by an individual from a given portfolio because more vessels shared the available biomass. This means managers are faced with a tradeoff between the average revenue individuals earn and the risk those individuals accept. These results illustrate the importance of considering connections between social and ecological dynamics when evaluating management options that constrain or facilitate fishers’ ability to diversify their fishing.

Phosphorus-utilisation efficiency and leaf-morphology traits of Rytidosperma species (wallaby grasses) that differ in their growth response to phosphorus fertilisation

2016 ◽  
Vol 64 (1) ◽  
pp. 65 ◽  
Author(s):  
Heidi A. Waddell ◽  
Richard J. Simpson ◽  
Hans Lambers ◽  
Brent Henderson ◽  
Megan H. Ryan ◽  
...  
Keyword(s):  
Leaf Area ◽  
Growth Rates ◽  
Dry Matter ◽  
Perennial Grasses ◽  
Dry Matter Content ◽  
Potential Growth ◽  
Fast Growing ◽  
Bromus Hordeaceus ◽  
P Concentration ◽  
Utilisation Efficiency

Rytidosperma species are perennial grasses found in cool temperate grasslands of Australia. The species differ in their intrinsic growth rates, response to phosphorus (P) fertiliser application and critical external P requirements (P required for 90% maximum growth). The present study examined whether internal P-utilisation efficiency (PUE) by Rytidosperma species influenced these differences. The PUE of nine Rytidosperma species and two grasses of Mediterranean origin, Bromus hordeaceus L. and Lolium perenne L., was assessed using alternative measures of shoot P concentration or its reciprocal. No measure of PUE was correlated with the critical external P requirements of the species. One measure of PUE, shoot dry matter per unit P, when assessed at a common shoot P content was correlated with potential growth rate (P < 0.001; r = 0.93; 4 mg shoot P). However, other measures of PUE were not correlated with potential growth rates. All of the fast-growing species (B. hordeaceus, L. perenne, Rytidosperma duttonianum (Cashmore) Connor & Edgar and Rytidosperma richardsonii (Cashmore) Connor & Edgar) exhibited high PUE, whereas PUE varied substantially among the slower-growing species. The fast-growing Rytidosperma species differed in the contribution that area-based P concentration of leaves and specific leaf area (SLA) made to the achievement of high PUE, and they retained shoot-morphology traits normally associated with slow-growing species such as smaller leaf area, smaller SLA and higher leaf dry matter content.

Identifying the weakest link: simulating adaptive management of the reintroduction of a threatened fish

2002 ◽  
Vol 59 (11) ◽  
pp. 1709-1716 ◽  
Author(s):  
Andrew R Bearlin ◽  
E S.G Schreiber ◽  
Simon J Nicol ◽  
A M Starfield ◽  
Charles R Todd
Keyword(s):  
Adaptive Management ◽  
Weak Link ◽  
Learning By Doing ◽  
Barriers To Learning ◽  
Management Options ◽  
Endangered Fish ◽  
Management Intervention ◽  
Management Actions ◽  
Goals And Objectives ◽  
Management Cycle

As part of an ongoing program of management for a critically endangered fish, we explored adaptive management as a method to overcome pervasive uncertainty regarding the reintroduction of trout cod (Maccullochella macquariensis Cuvier). We simulated the entire adaptive management cycle to explore the suitability of the approach for guiding threatened species management and to identify problems and barriers to "learning by doing". During the planning phase, a number of compromises were identified between specification of goals and objectives, the available management options, and current monitoring capacity. Undertaking a simulation of the implementation of alternate adaptive approaches to this reintroduction provided a number of insights into adaptive management in general. First, identifying the weak link in the process of inference emphasized the need to consider whether goals and objectives are achievable and meaningful and whether they complement monitoring and (or) any other limitations of the system. Second, in natural resource management, it is crucial to negotiate objectives in the light of what one can measure. Third, although there are lessons to be learned from each stage of the adaptive management cycle, there is value in simulating the entire adaptive management cycle, including management actions, monitoring, and the states of the system that lead to management intervention.

Hybridization in leopard frogs (Rana pipiens complex): terrestrial performance of newly metamorphosed hybrid and parental genotypes in field enclosures

2001 ◽  
Vol 79 (9) ◽  
pp. 1552-1558 ◽  
Author(s):  
Matthew J Parris
Keyword(s):  
Growth Rates ◽  
Life Histories ◽  
Parental Species ◽  
Natural Populations ◽  
Life Cycles ◽  
Natural Hybridization ◽  
Evolutionary Potential ◽  
Leopard Frogs ◽  
Rana Blairi ◽  
Advanced Generation

Terrestrial ecology has been largely neglected in the study of amphibian life histories because it is difficult to manipulate most species during the terrestrial stage. I examined the terrestrial performance of Rana blairi, Rana sphenocephala, and four hybrid (two F1 and two advanced generation) genotypes in replicated experimental enclosures to test for differences in traits related to juvenile terrestrial fitness. I produced all genotypes by means of artificial fertilizations using frogs collected from natural populations in central Missouri, and juvenile frogs were obtained from larvae reared in experimental ponds. Following metamorphosis, froglets were raised in single-genotype groups in terrestrial enclosures through the first overwintering. The proportion surviving did not vary among genotypes, but the power to detect significant differences was low. F1 hybrid genotypes BS and SB demonstrated significantly higher growth rates than either parental species or advanced-generation hybrid genotypes. Observation of growth rates of advanced-generation hybrids equal to those of the parental species, and heterosis in F1 hybrids for growth rate, suggests that natural hybridization between R. blairi and R. sphenocephala can produce novel and relatively fit hybrid genotypes. Direct measurement of multiple fitness components for hybrid and parental genotypes is critical for assessing the evolutionary potential of natural hybridization in organisms with complex life cycles.

scholarly journals Effects of Initial Soil Properties on Three-Year Performance of Six Tree Species in Tropical Dry Forest Restoration Plantings

Forests ◽  
2019 ◽  
Vol 10 (5) ◽  
pp. 428 ◽  
Author(s):  
Valentina Carrasco-Carballido ◽  
Cristina Martínez-Garza ◽  
Héctor Jiménez-Hernández ◽  
Flavio Márquez-Torres ◽  
Julio Campo
Keyword(s):  
Soil Properties ◽  
Growth Rates ◽  
Tropical Dry Forest ◽  
Dry Forest ◽  
Diameter Growth ◽  
Relative Growth ◽  
Fast Growing ◽  
Initial Soil ◽  
Slow Growing ◽  
Fast Growing Species

Deforestation of tropical dry forest reduces soil fertility, with negative effects on future restoration intervention. To evaluate the effect of initial soil properties on three-year performance of six tree species in restoration settings, we measured C, N, and P contents in topsoils of 48 plots under minimal (exclusions of livestock grazing) and maximal (plantings of six native species) restoration intervention during two years in tropical dry forest in central Mexico. Survival and height and diameter relative growth rates were evaluated by species and by growth rank (three fast- and three slow-growing species). After two years, organic C and the C:N ratio increased early during natural succession; these increases might be related to high density of N2-fixing recruits at both intervention levels. Changes in N availability for plants (i.e., NO3− and NH4+ contents) occurred after cattle exclusion. After 40 months, the fast-growing legume Leucaena esculenta (DC.) Benth. had the highest survival (65.55%) and relative growth rate in both height (3.16%) and diameter (5.67%). Fast-growing species had higher survival and diameter growth rates than slow-growing species. Higher diameter growth rates for fast-growing species may be associated with a higher ability to forage for soil resources, whereas similar height growth rates for slow and fast-growing species suggested low competition for light due to slow natural succession at the site. Planted seedlings had higher survival possibly due to initial high NO3− content in the soil. Also, fast-growing species seem to benefit from initially higher pH in the soil. Both soil properties (i.e., pH and NO3−) may be augmented to favor the performance of fast-growing species in restoration plantings and to further accelerate soil recovery in tropical dry forests.

scholarly journals 89 Nutrition and Feeding of the Modern Hyperprolific Sow

2020 ◽  
Vol 98 (Supplement_3) ◽  
pp. 75-75
Author(s):  
Laura L Greiner
Keyword(s):  
Amino Acid ◽  
Body Mass ◽  
Milk Production ◽  
Feed Intake ◽  
Growth Rates ◽  
Environmental Influences ◽  
Energy Requirements ◽  
Reproductive Tissue ◽  
Fast Growing ◽  
Amino Acid Requirements

Abstract Over the last 25 years, the sow has developed to have a leaner body mass to address the need for leaner, fast growing offspring. The leaner body mass results in a female that biologically can have a lower feed intake. Furthermore, the number of pigs born per litter and milk production have also increased during the same timeframe. Much research has been conducted over the years to investigate the amino acid and energy requirements of both the lactating and gestating sow; however, application of the research has resulted in varied responses. The varied responses can be related to sow health, environmental influences, litter growth rates, and anticipated body reserve changes during lactation. Furthermore, calculations associated with the regression of reproductive tissue after farrowing can complicate the analysis of amino acid requirements. This presentation will discuss some of the recent research associated with feeding the modern sow, potentially challenging some of the differences in data, and offering some thoughts on looking towards the next 25 years of sow production.

scholarly journals Estimating blue whale skin isotopic incorporation rates and baleen growth rates: Implications for assessing diet and movement patterns in mysticetes

PLoS ONE ◽  
2017 ◽  
Vol 12 (5) ◽  
pp. e0177880 ◽  
Author(s):  
Geraldine Busquets-Vass ◽  
Seth D. Newsome ◽  
John Calambokidis ◽  
Gabriela Serra-Valente ◽  
Jeff K. Jacobsen ◽  
...  
Keyword(s):  
Growth Rates ◽  
Movement Patterns ◽  
Blue Whale ◽  
Isotopic Incorporation

Wildlife Damage Control

2007 ◽  
Author(s):  
Jim Hone
Keyword(s):  
Biodiversity Conservation ◽  
Wildlife Management ◽  
Damage Control ◽  
Animal Health ◽  
Real Life ◽  
Individual Species ◽  
Management Actions ◽  
Wildlife Damage ◽  
Vertebrate Pests ◽  
Real Value

The types of damage caused by wildlife are many and varied, and can be costly and far-reaching. Until now, there has been little effort to identify and evaluate generalities across that broad range of species, methods and topics. Wildlife Damage Control promotes principle-based thinking about managing impact. It documents and discusses the key principles underlying wildlife damage and its control, and demonstrates their application to real-life topics – how they have been used in management actions or how they could be tested in the future. It synthesises the wide but diffuse literature dealing with the impacts of vertebrate pests and encourages readers to adopt a more theoretical framework for thinking about pest impacts and ways to manage them. The book is organised around key principles that apply across species, rather than looking at individual species, and is damage-based not pest animal-based. Within each chapter there are exercises designed to help readers learn and evaluate key principles. Conservation biologists, ecologists and others involved in wildlife management will find the sections covering principles in biodiversity conservation, of production such as agriculture, and in human and animal health of real value.

scholarly journals Economic impact of cross compliance in the field of animal welfare (Acts C18 and C16)

2015 ◽  
Vol 10 (1s) ◽  
Author(s):  
Marisanna Speroni ◽  
Maurizio Capelletti ◽  
Antonio Bruni ◽  
Luigi Degano
Keyword(s):  
Animal Welfare ◽  
Economic Impact ◽  
Animal Health ◽  
Animal Husbandry ◽  
Market Prices ◽  
Management Actions ◽  
Public Grant ◽  
Cattle Farms ◽  
Cross Compliance

The paper reports the results of assessment of animal welfare at farm level on two dairy cattle farms, identification of structural and management actions to improve the animal welfare and estimate of the costs of such actions; furthermore the economic impact of the potential support under measure 215 of the Rural Development Plan was also simulated. At the time of assessment, no severe break of compliance was detected at the two farms; however some weaknesses were identified and improvement were proposed in order to maintain the current animal welfare status and avoid future failures. The two use cases showed that investments to improve animal welfare were partly self funded in the mid and long term due to the higher milk yield and the better animal health that were expected as consequence; however, in the short term, a large part of expenses was fully borne by farmers if not supported by a public grant or higher market prices. The support provided by the measure 215 is effective in rewarding farmers who undertake to adopt standards of animal husbandry which go beyond the relevant mandatory standards.

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