An improved model for the population dynamics of cattle gastrointestinal nematodes on pasture: parameterisation and field validation for Ostertagia ostertagi and Cooperia oncophora in northern temperate zones

Wang, Tong; Vineer, Hannah Rose; Redman, Elizabeth; Morosetti, Arianna; Chen, Rebecca; McFarland, Christopher; Colwell, Douglas D.; Morgan, Eric R.; Gilleard, John S.

doi:10.1016/j.vetpar.2022.109777

Cited by 6 publications

(10 citation statements)

References 27 publications

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“…2004; Wang et al . 2022) are generally well known. All three traits have an optimum temperature and a minimum and maximum temperature in which the trait functions.…”

Section: Resultsmentioning

confidence: 99%

“…2016; Wang et al . 2022). Thus, conclusions on the effect of temperature cannot be drawn based on one trait or stage only, but it is important to consider the different life-history traits, larvae stages, substrates, and the corresponding temperature ranges, simultaneously.…”

Section: Resultsmentioning

confidence: 99%

“…Similarly, there was increased migration under increasing simulated rainfall, again with a required minimum for migration to occur (Wang et al . 2022). In contrast to migration out of a faecal pat, it has been suggested that parasitic nematodes do not need water to move from the soil surface into the herbage (van Dijk & Morgan 2011).…”

Section: Resultsmentioning

confidence: 99%

“…1.1 Temperature effects on parasitic nematode life-history traits Temperature effects (studied in laboratory) on hatching (n p = 8, n r = 18, Table S1) (Crofton 1965;Melville et al 2020), development (n p = 14, n r = 29, Table S2) (Ciordia & Bizell 1963;Gyeltshen et al 2022), and survival (n p = 15, n r = 19, Table S3) (Gardner et al 2004;Wang et al 2022) are generally well known. All three traits have an optimum temperature and a minimum and maximum temperature in which the trait functions.…”

Section: Resultsmentioning

confidence: 99%

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Climate change effects on terrestrial parasitic nematodes: Where are the knowledge gaps?

Moerman,

Albon,

Coulson

et al. 2023

J. Helminthol.

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Climate change is expected to affect parasitic nematodes and hence possibly parasite–host dynamics and may have far-reaching consequences for animal health, livestock production, and ecosystem functioning. However, there has been no recent overview of current knowledge to identify how studies could contribute to a better understanding of terrestrial parasitic nematodes under changing climates. Here we screened almost 1,400 papers to review 57 experimental studies on the effects of temperature and moisture on hatching, development, survival, and behaviour of the free-living stages of terrestrial parasitic nematodes with a direct life cycle in birds and terrestrial mammals. Two major knowledge gaps are apparent. First, research should study the temperature dependency curves for hatching, development, and survival under various moisture treatments to test the interactive effect of temperature and moisture. Second, we specifically advocate for more studies that investigate how temperature, and its interaction with moisture, affect both vertical and horizontal movement of parasitic nematodes to understand infection risks. Overall, we advocate for more field experiments that test environmental effects on life-history traits and behaviour of parasitic nematodes in their free-living stages under natural and realistic circumstances. We also encourage studies to expand the range of used hosts and parasitic nematodes because 66% of results described in the available studies use sheep and cattle as hosts and 32% involve just three nematode species. This new comprehension brings attention to understudied abiotic impacts on terrestrial parasitic nematodes and will have broader implications for livestock management, wildlife conservation, and ecosystem functioning in a rapidly warming climate.

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“…2004; Wang et al . 2022) are generally well known. All three traits have an optimum temperature and a minimum and maximum temperature in which the trait functions.…”

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

See 2 more Smart Citations

Climate change effects on terrestrial parasitic nematodes: Where are the knowledge gaps?

Moerman,

Albon,

Coulson

et al. 2023

J. Helminthol.

View full text Add to dashboard Cite

show abstract

“…There seems to be an important interaction between temperature and rainfall, with higher average temperatures (17 °C) and rainfall resulting in a significantly greater herbage larval yield than lower temperatures (4 °C), with the mechanical dispersing of the faecal pat during rainfall suggested to be a key element in facilitating migration [ 40 , 42 ]. Recently, a study in bovines demonstrated a positive linear relationship between L3 migration and the amount of rainfall under otherwise controlled climatic conditions (temperature 20 °C), with at least 5 mm of rain required for migration from the faecal pats to occur [ 43 ]. Thus, in the present migration study, which was performed during the summer and early autumn, when average monthly temperatures during the first 14 weeks of the study period (July–September) ranged from 13.1 to 21.9 °C, rainfall would be expected to have a significant effect on larval migration.…”

Section: Discussionmentioning

confidence: 99%

Evaluation of Strategies to Reduce Equine Strongyle Infective Larvae on Pasture and Study of Larval Migration and Overwintering in a Nordic Climate

Osterman‐Lind

Alm

Hassler³

et al. 2022

Animals

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Horses, as grazing animals, are inadvertently exposed to intestinal parasites that, if not controlled, may cause disease. However, the indiscriminate use of anthelmintic drugs has led to drug resistance, highlighting the need for pasture-management practices to reduce the level of parasitic exposure and lessen reliance on drugs. The efficacy of such methods depends both on the epidemiology of the parasites and the prevailing weather conditions. The aim of the study was to investigate the effect of faecal removal and harrowing on reducing the number of parasite larvae in herbage. Moreover, the migratory and survival ability of strongyle larvae in a Nordic climate was studied. Faeces from horses naturally infected with strongyle nematodes were used to contaminate pastures and grass samples were collected to harvest larvae. Twice-weekly faecal removal significantly reduced larval yields, whereas harrowing on a single occasion under dry weather conditions in the summer did not. Strongyle larvae were able to migrate 150 cm from the faecal pats, but most larvae were found within 50 cm. Both Cyathostominae and S. vulgaris survived the winter months with larvae harvested up to 17–18 months after faecal placement. Resting of pastures for one year greatly reduced the parasite level, but two years of rest were required for parasite-free pasture.

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Biotic interactions in soil and dung shape parasite transmission in temperate ruminant systems: An integrative framework

Boughton,

Lancaster,

Morgan

2024

Ecological Applications

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Gastrointestinal helminth parasites undergo part of their life cycle outside their host, such that developmental stages interact with the soil and dung fauna. These interactions are capable of affecting parasite transmission on pastures yet are generally ignored in current models, empirical studies and practical management. Dominant methods of parasite control, which rely on anthelmintic medications for livestock, are becoming increasingly ineffective due to the emergence of drug‐resistant parasite populations. Furthermore, consumer and regulatory pressure on decreased chemical use in agriculture and the consequential disruption of biological processes in the dung through nontarget effects exacerbates issues with anthelmintic reliance. This presents a need for the application and enhancement of nature‐based solutions and biocontrol methods. However, successfully harnessing these options relies on advanced understanding of the ecological system and interacting effects among biotic factors and with immature parasite stages. Here, we develop a framework linking three key groups of dung and soil fauna—fungi, earthworms, and dung beetles—with each other and developmental stages of helminths parasitic in farmed cattle, sheep, and goats in temperate grazing systems. We populate this framework from existing published studies and highlight the interplay between faunal groups and documented ecological outcomes. Of 1756 papers addressing abiotic drivers of populations of these organisms and helminth parasites, only 112 considered interactions between taxa and 36 presented data on interactions between more than two taxonomic groups. Results suggest that fungi reduce parasite abundance and earthworms may enhance fungal communities, while competition between dung taxa may reduce their individual effect on parasite transmission. Dung beetles were found to impact fungal populations and parasite transmission variably, possibly tied to the prevailing climate within a specific ecological context. By exploring combinations of biotic factors, we consider how interactions between species may be fundamental to the ecological consequences of biocontrol strategies and nontarget impacts of anthelmintics on dung and soil fauna and how pasture management alterations to promote invertebrates might help limit parasite transmission. With further development and parameterization the framework could be applied quantitatively to guide, prioritize, and interpret hypothesis‐driven experiments and integrate biotic factors into established models of parasite transmission dynamics.

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An improved model for the population dynamics of cattle gastrointestinal nematodes on pasture: parameterisation and field validation for Ostertagia ostertagi and Cooperia oncophora in northern temperate zones

Cited by 6 publications

References 27 publications

Climate change effects on terrestrial parasitic nematodes: Where are the knowledge gaps?

Climate change effects on terrestrial parasitic nematodes: Where are the knowledge gaps?

Evaluation of Strategies to Reduce Equine Strongyle Infective Larvae on Pasture and Study of Larval Migration and Overwintering in a Nordic Climate

Biotic interactions in soil and dung shape parasite transmission in temperate ruminant systems: An integrative framework

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