During the slaughter period in autumn 1992 and 1993 lungs and the gastrointestinal tract was collected from a single lamb originating from 96 sheep farms, selected to reflect the distribution of farms in Iceland. The results on the gastrointestinal helminths have already been published. The lungs were kept frozen until analysed in 2019. Nematodes were directly searched for in the lungs of 84 lambs. Results on larval counts were handed over to the present authors for comparison purposes. Three lungworm nematode species were detected: Muellerius capillaris (total prevalence 35.1%), Protostrongylus sp. (2.4%), and Dictyocaulus filaria (16.7%). M. capillaris was found in lambs from all parts of Iceland except from certain areas in the north and northeast. Protostrogylus sp. was detected on two adjacent farms in the north. D. filaria was frequently found in lambs from farms in the southern and western parts, whereas sporadic cases were found in north and east Iceland. As relatively few lambs were examined, the distribution area of sheep lungworm in the early 1990s is regarded to have been more extensive than indicated in the article.
{"title":"Lung nematodes of sheep (Ovis aries) in Iceland - prevalence, intensity and geographic distribution in 1992 and 1993","authors":"Hrafnkatla Eiríksdóttir, K. Skírnisson","doi":"10.16886/IAS.2021.01","DOIUrl":"https://doi.org/10.16886/IAS.2021.01","url":null,"abstract":"During the slaughter period in autumn 1992 and 1993 lungs and the gastrointestinal tract was collected from a single lamb originating from 96 sheep farms, selected to reflect the distribution of farms in Iceland. The results on the gastrointestinal helminths have already been published. The lungs were kept frozen until analysed in 2019. Nematodes were directly searched for in the lungs of 84 lambs. Results on larval counts were handed over to the present authors for comparison purposes. Three lungworm nematode species were detected: Muellerius capillaris (total prevalence 35.1%), Protostrongylus sp. (2.4%), and Dictyocaulus filaria (16.7%). M. capillaris was found in lambs from all parts of Iceland except from certain areas in the north and northeast. Protostrogylus sp. was detected on two adjacent farms in the north. D. filaria was frequently found in lambs from farms in the southern and western parts, whereas sporadic cases were found in north and east Iceland. As relatively few lambs were examined, the distribution area of sheep lungworm in the early 1990s is regarded to have been more extensive than indicated in the article.","PeriodicalId":50396,"journal":{"name":"Icelandic Agricultural Sciences","volume":"34 1","pages":"3-14"},"PeriodicalIF":0.5,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67597755","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Faecal samples were collected from a total of 11 calves on three dairy farms (four from two farms and three from one) where calves generally thrive well and no anti-coccidial treatment is habitually carried out. One of the farms keeps calves in groups on hay/straw bedding, one keeps calves in pairs on plastic slats and then in groups on concrete slats, and the third one keeps calves in groups on concrete slats. Faecal consistency and the total number of Eimeria spp. oocysts per gram faeces (OPG) were determined and species identification was carried out by morphology. Eimeria oocysts were detected in all calves at some point of the study period, and diarrhoea was seen in 55% of the calves. The highest peak in oocyst excretion was 69,300 OPG. The first peak in oocyst excretion was seen 2-3 weeks after calves had been moved to group pens, and a second peak was seen 2-3 weeks later. Nine Eimeria species were found, including E. bovis and E. zuernii. The results are in accordance with previous studies showing that one of the risk factors for Eimeria infection in calves is entering a group pen where older calves are already being kept.
{"title":"Patterns of Eimeria excretion in young Icelandic calves","authors":"C. Oddsdóttir, G. R. Pálsdóttir","doi":"10.16886/IAS.2021.03","DOIUrl":"https://doi.org/10.16886/IAS.2021.03","url":null,"abstract":"Faecal samples were collected from a total of 11 calves on three dairy farms (four from two farms and three from one) where calves generally thrive well and no anti-coccidial treatment is habitually carried out. One of the farms keeps calves in groups on hay/straw bedding, one keeps calves in pairs on plastic slats and then in groups on concrete slats, and the third one keeps calves in groups on concrete slats. Faecal consistency and the total number of Eimeria spp. oocysts per gram faeces (OPG) were determined and species identification was carried out by morphology. Eimeria oocysts were detected in all calves at some point of the study period, and diarrhoea was seen in 55% of the calves. The highest peak in oocyst excretion was 69,300 OPG. The first peak in oocyst excretion was seen 2-3 weeks after calves had been moved to group pens, and a second peak was seen 2-3 weeks later. Nine Eimeria species were found, including E. bovis and E. zuernii. The results are in accordance with previous studies showing that one of the risk factors for Eimeria infection in calves is entering a group pen where older calves are already being kept.","PeriodicalId":50396,"journal":{"name":"Icelandic Agricultural Sciences","volume":"34 1","pages":"29-39"},"PeriodicalIF":0.5,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67597845","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Juliane Kuckuk, Sibren van Manen, Ó. Eggertsson, E. Oddsdóttir, J. Esper
The green spruce aphid Elatobium abietinum is an important defoliating pest of Sitka spruce (Picea sitchensis) in Iceland. A comparison of two urban Sitka stands in Reykjavík, from 2013-2017, reveals a distinct defoliation difference between trees located near a main road (94% defoliated) and several hundred meters away from heavy traffic (47%). Chemical analyses of the spruce needles demonstrate substantially higher nitrogen ratios in trees near traffic. Furthermore, the recently warming winter temperatures promoted larger overwintering aphid populations since 2003, as well as a shift of mass outbreaks from autumn to spring, accompanied by distinct growth suppressions one year after an aphid population spike in the post-2003 tree-ring data. The results of this study indicate that the mechanisms triggering Sitka spruce dieback in Reykjavík include a combination of increasing winter temperatures, more frequent and severe green spruce aphid outbreaks, as well as elevated N values in the needles of urban trees.
{"title":"Defoliation and dieback of Sitka spruce in Reykjavík, Iceland","authors":"Juliane Kuckuk, Sibren van Manen, Ó. Eggertsson, E. Oddsdóttir, J. Esper","doi":"10.16886/IAS.2021.02","DOIUrl":"https://doi.org/10.16886/IAS.2021.02","url":null,"abstract":"The green spruce aphid Elatobium abietinum is an important defoliating pest of Sitka spruce (Picea sitchensis) in Iceland. A comparison of two urban Sitka stands in Reykjavík, from 2013-2017, reveals a distinct defoliation difference between trees located near a main road (94% defoliated) and several hundred meters away from heavy traffic (47%). Chemical analyses of the spruce needles demonstrate substantially higher nitrogen ratios in trees near traffic. Furthermore, the recently warming winter temperatures promoted larger overwintering aphid populations since 2003, as well as a shift of mass outbreaks from autumn to spring, accompanied by distinct growth suppressions one year after an aphid population spike in the post-2003 tree-ring data. The results of this study indicate that the mechanisms triggering Sitka spruce dieback in Reykjavík include a combination of increasing winter temperatures, more frequent and severe green spruce aphid outbreaks, as well as elevated N values in the needles of urban trees.","PeriodicalId":50396,"journal":{"name":"Icelandic Agricultural Sciences","volume":"34 1","pages":"15-28"},"PeriodicalIF":0.5,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67597829","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-04-10DOI: 10.1002/9781119427155.ch7
{"title":"Overview of Volcanics in Iceland","authors":"","doi":"10.1002/9781119427155.ch7","DOIUrl":"https://doi.org/10.1002/9781119427155.ch7","url":null,"abstract":"","PeriodicalId":50396,"journal":{"name":"Icelandic Agricultural Sciences","volume":"438 1","pages":""},"PeriodicalIF":0.5,"publicationDate":"2020-04-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77833367","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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