Estimated Mortality of Selected Migratory Bird Species from Mowing and Other Mechanical Operations in Canadian Agriculture

Tews, Joerg; Bert, Daniel G.; Mineau, Pierre

doi:10.5751/ace-00559-080208

Cited by 13 publications

(15 citation statements)

References 30 publications

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“…Because of the prevalence of cropland on the prairies, a substantial proportion of the population of these species could nest in cropland. Tews et al (2013) modeled the potential effect of agriculture on Horned Larks and estimated that the loss of Horned Larks from farming operations was low, however their estimates were coarse and subject to high uncertainty, e.g., their two estimates of the size of the prairie-breeding Horned Lark population varied by an order of magnitude. We encourage others to pursue studies of bird species that are prone to nest in cropland to more accurately determine the potential impact of tillage and cultivation on those species.…”

Section: Discussionmentioning

confidence: 99%

Agricultural destruction of Northern Pintail nests on cropland in prairie Canada

Duncan¹,

Devries²

2018

ACE

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ABSTRACT. It has been postulated that the decline of the Northern Pintail (Anas acuta) population is related to the propensity of female pintails to nest in cropland. Using spatial modeling at multiple scales, we estimated that the long-term average breeding population of Northern Pintails in prairie Canada would have initiated a mean of 974,260 nests/year, of which 47% (457,900 +/-43,270) would have been in cropland. Nest success rates are very low (5%) in spring-seeded cropland with predation and agricultural activity responsible for approximately 78% and 22% of the nest loss, respectively. We estimated that a long-term mean of 94,750 (+/-19,680) nests representing 524,725 pintail eggs would have been destroyed by agricultural seeding and tillage operations on cropland annually. The number of nests/eggs lost in any given year would vary by an order of magnitude dependent primarily upon the size of the pintail population nesting on the prairies in that year. Our estimate of incidental take is quite robust because it is based on multiple, long-term studies using data from across the Canadian prairies. Our analysis provides additional support for the theory that the pintail's habit of nesting in cropland is the probable reason for the decline in the pintail population, irrespective of the cause of nest loss. Although predation is the primary cause of the loss of pintail nests in cropland, the proportion of nests lost to predation in cropland is similar to that in other upland habitats on the prairies. Thus the additional loss from agriculture could well be incremental and may be the proximate causative factor in the pintail population's decline and failure to recover in recent decades. Destruction de nids de Canard pilet causée par l'agriculture sur les terres cultivées des Prairies canadiennesRÉSUMÉ. Une des raisons avancées pour expliquer la diminution de la population de Canard pilet (Anas acuta) est en lien avec la propension des femelles à nicher sur les terres cultivées. Au moyen de modélisation spatiale à de multiples échelles, nous avons estimé que la population nicheuse moyenne de longue date de Canard pilet des Prairies canadiennes aurait initié une moyenne de 974 260 nids/année, dont 47 % (457 900 +/-43 270) se seraient trouvés sur les terres cultivées. Le taux de succès des nids est très faible (5 %) sur les terres à culture de printemps, où la prédation et les activités agricoles sont responsables de 78 % et de 22 % des pertes de nids, respectivement. Nous avons estimé qu'une moyenne de 94 750 (+/-19 680) nids équivalant à 524 725 oeufs de pilets auraient été détruits annuellement par les opérations de travail du sol et d'ensemencement sur les terres cultivées. Le nombre de nids/oeufs détruits au cours d'une année donnée variait d'abord en fonction de la taille de la population de pilets nichant dans les Prairies cette année-là. Notre estimation de la prise accessoire est assez fiable parce qu'elle est fondée sur de multiples recherches de longue date utilisant des données provenant des Prairies ca...

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Section: Discussionmentioning

confidence: 99%

Agricultural destruction of Northern Pintail nests on cropland in prairie Canada

Duncan¹,

Devries²

2018

ACE

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“…Based on this average, the predicted total habitat loss for wind farms nationwide was 3635 ha (Table 3). Using the nest density estimates provided in Hobson et al (2013) and Tews et al (2013), the total number of potentially affected nests in each habitat for all represented provinces was 5715. We had few data on the timing of construction activities to estimate the number of nests that might have been disturbed or destroyed during construction.…”

Section: Loss Of Nesting Habitat and Nest Mortality Estimatesmentioning

confidence: 99%

“…The remaining 103 wind farms for which environmental assessments could not be obtained were located based on their geographical coordinates, and assigned to one of these broad habitat classifications based on SPOT satellite imagery for the location. Nest densities in these habitats were estimated based on previous Canadian studies of incidental take due to forestry operations (Hobson et al 2013), mowing, and other mechanical operations in agricultural landscapes (Tews et al 2013). We used the MODIS land cover classification layer to calculate the total area of each broad habitat type and province and the Hobson et al (2013) and Tews et al (2013) nest densities to estimate total number of nests.…”

Section: Loss Of Nesting Habitatmentioning

confidence: 99%

“…Nest densities in these habitats were estimated based on previous Canadian studies of incidental take due to forestry operations (Hobson et al 2013), mowing, and other mechanical operations in agricultural landscapes (Tews et al 2013). We used the MODIS land cover classification layer to calculate the total area of each broad habitat type and province and the Hobson et al (2013) and Tews et al (2013) nest densities to estimate total number of nests. The percent of nesting habitat lost for a given habitat type in a province was calculated by dividing the predicted habitat lost from wind energy developments by the total area for that habitat type across the province.…”

Section: Loss Of Nesting Habitatmentioning

confidence: 99%

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Canadian Estimate of Bird Mortality Due to Collisions and Direct Habitat Loss Associated with Wind Turbine Developments

Zimmerling¹,

Pomeroy²,

d'Entremont³

et al. 2013

ACE

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“…Therefore, the knowledge of effects of different agricultural practices on the distribution and abundance of different species is fundamental for effective evidence-based sustainable management of these ecosystems. Consequently, effects of particular agricultural practices on the distribution and abundance of organisms and the composition of communities are of special importance for applied ecology and science related to conservation of agricultural ecosystems (Tews, Bert, and Mineau 2013;VanBeek, Brawn, and Ward 2014).…”

Section: Introductionmentioning

confidence: 99%

Impact of night-time crop harvesting on bat activity in agricultural landscape

Pluciński

Żmihorski

Pluciński

2015

Zoology and Ecology

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We investigated activity of bats in agricultural landscape in relation to crop harvesting during the night. We conducted bat monitoring along four transects (8 km in total) located in Western Poland from July to September over three years. We used a Batbox detector for the assessment of bat activity. We collected data on two species (Nyctalus noctula, Eptesicus serotinus) and a group of the genus Pipistrellus. The generalised linear mixed model revealed that activity of N. noctula and E. serotinus in studied fields was significantly higher during nights of crop harvesting as compared to other nights, whereas species of the genus Pipistrellus did not show such a response. During night-time crop harvesting, activity indices of E. serotinus and N. noctula were, respectively, 12.5-fold and 5.6-fold higher than those during non-harvesting nights. Moreover, Pipistrellus bats showed a linear decrease in their activity from July to September. Activity of the three species was not correlated and activity of one species was not a reliable predictor of other species activity. Causes of bat activity intensification during crop harvesting are not clear. However, this effect may be driven by an increase in abundance and availability of flying invertebrates. In the context of bat conservation in agricultural landscape, it is necessary to take this increase in their activity into account, especially in the vicinity of wind farms or major roads. We conclude that during night-time crop harvesting, wind farms located in agricultural areas should be temporary stopped to reduce bat mortality.Lenkijos vakarinėje dalyje, žemės ūkio kraštovaizdyje ištirtas derliaus nuėmimo naktimis poveikis šikšnosparnių aktyvumui. 2010-2012 m. nuo liepos iki rugsėjo mėnesio, naudojant ultragarso detektorių Batbox, 4 transektose (8 km) buvo vykdomas šikšnosparnių monitoringas. Surinkti duomenys apie Nyctalus noctula, Eptesicus serotinus ir Pipistrellus genties šikšnosparnius. Taikant bendrą tiesinį mišrųjį GLMM modelį nustatyta, kad Nyctalus noctula ir Eptesicus serotinus aktyvumas tirtuose laukuose naktinio derliaus nuėmimo metu buvo ženkliai didesnis (atitinkamai 5,6 ir 12,5 karto) nei kitomis naktimis. Pipistrellus genties šikšnosparnių aktyvumui derliaus nuėmimas naktį poveikio neturėjo. Nuo liepos iki rugsėjo šių šikšnosparnių aktyvumas mažėjo tiesiškai. Ryšio tarp tirtų šikšnosparnių rūšių aktyvumo nenustatyta. Išaugusį šikšnosparnių aktyvumą derliaus nuėmimo metu galima būtų paaiškinti padidėjusia skraidančių bestuburių gausa. Siekiant išsaugoti šikšnosparnius žemės ūkio kraštovaizdyje būtina atsižvelgti į padidėjusį jų aktyvumą, ypač netoli vėjo jėgainių ir pagrindinių kelių. Naktinio derliaus nuėmimo metu žemės ūkio plotuose esančios vėjo jėgainės turėtų būti laikinai stabdomos, kad sumažėtų žūstančių šikšnosparnių skaičius.

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Estimated Mortality of Selected Migratory Bird Species from Mowing and Other Mechanical Operations in Canadian Agriculture

Cited by 13 publications

References 30 publications

Agricultural destruction of Northern Pintail nests on cropland in prairie Canada

Agricultural destruction of Northern Pintail nests on cropland in prairie Canada

Canadian Estimate of Bird Mortality Due to Collisions and Direct Habitat Loss Associated with Wind Turbine Developments

Impact of night-time crop harvesting on bat activity in agricultural landscape

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