Ornis Svecica最新文献

Herbivory on aquatic macrophytes by geese and swans—a review of methods, effects, and management 鹅和天鹅对水生大型植物的食草--方法、影响和管理综述

Ornis Svecica Pub Date : 2024-08-08 DOI: 10.34080/os.v34.25271

Elsie Kjeller, Jonas Waldenström, Johan Elmberg, G. Gunnarsson

{"title":"Herbivory on aquatic macrophytes by geese and swans—a review of methods, effects, and management","authors":"Elsie Kjeller, Jonas Waldenström, Johan Elmberg, G. Gunnarsson","doi":"10.34080/os.v34.25271","DOIUrl":"https://doi.org/10.34080/os.v34.25271","url":null,"abstract":"In recent decades, interest has grown in how increasing populations of herbivorous geese and swans (Anseriformes: Anatidae: Anserinae) affect macrophyte communities in wetlands, especially because many waterbodies are simultaneously subjected to stressors like eutrophication and biodiversity declines. Here, we review the literature on methods applied in grazing experiments that have been conducted in aquatic ecosystems. We also investigate and how different macrophyte characteristics may respond to waterfowl herbivory. Results indicate that both research methodology and responses of macrophytes differ widely among studies. While most experimental studies on grazing pressure employ a ‘paired plot design’ with exclosures and open control plots, the structure, size, and placement of plots vary among studies. Commonly sampled macrophyte variables are biomass (of either above- or below-ground plant parts), density, height, plant cover, and community composition. The literature provides support that geese and swans significantly affect several of these variables, but the outcome depends on additional factors, e.g., waterfowl density, water depth, and timing (within or between seasons/years). Because of the persisting conservation threats to aquatic ecosystems, more knowledge is needed about potential direct and indirect consequences of waterfowl herbivory in these environments.","PeriodicalId":52418,"journal":{"name":"Ornis Svecica","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-08-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141926655","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

DNA profiles of shed Taiga Bean Goose feathers indicate between-season fidelity to moulting sites in Swedish Lapland 脱落的泰加豆雁羽毛的 DNA 图谱显示了瑞典拉普兰地区季节间对换羽地点的忠诚度

Ornis Svecica Pub Date : 2024-07-26 DOI: 10.34080/os.v34.25715

Adriaan De Jong, O. Kleven, Johanna Honka, Isak Vahlström

引用次数: 0

Influence of pool habitat characteristics on Red-throated Loon Gavia stellata occupancy and reproduction in a Boreal forest landscape 水池栖息地特征对北方森林景观中红喉琵鹭（Gavia stellata）栖息和繁殖的影响

Ornis Svecica Pub Date : 2024-07-26 DOI: 10.34080/os.v34.23510

Börje Dahlén, Ute Bradter, Elisabet Ottosson, Mats OG Eriksson

{"title":"Influence of pool habitat characteristics on Red-throated Loon Gavia stellata occupancy and reproduction in a Boreal forest landscape","authors":"Börje Dahlén, Ute Bradter, Elisabet Ottosson, Mats OG Eriksson","doi":"10.34080/os.v34.23510","DOIUrl":"https://doi.org/10.34080/os.v34.23510","url":null,"abstract":"We investigated the occupancy of alternative breeding pools for Red-throated Loon Gavia stellata and the reproductive output in relation to a selection of habitat characteristics in a coniferous forest inland area in South-central Sweden, using generalized linear mixed models. Models provided good support for the conclusion that small-sized pools with high coverage of floating vegetation were preferred. The survival of pre-fledged chicks was higher when foraging waters were located closer, and open mires around the breeding pool were more extensive. We propose that these habitat characteristics should be considered in nature conservation planning and management, as well as in environmental impact assessments. We found that with the current data, predicting pool occupancy and chick survival based on the selected habitat characteristics was not sufficiently accurate to replace field surveys and can only be used as a complementary method. We also emphasize the importance of freshwaters, potentially to be used for foraging in the surrounding landscape, which is an often-overlooked aspect in management and impact assessments.","PeriodicalId":52418,"journal":{"name":"Ornis Svecica","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-07-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141801813","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Two Eurasian Blue Tits Cyanistes caeruleus roosting together in a nest-box on multiple winter nights 两只欧亚蓝山雀（Cyanistes caeruleus）在多个冬夜一起在巢箱中栖息

Ornis Svecica Pub Date : 2024-06-10 DOI: 10.34080/os.v34.24041

Fredrik Andreasson

引用次数: 0

Territory occupation sequence and population change 2005–2019 in a satellite versus core area for Grasshopper Warblers Locustella naevia 2005-2019 年卫星与核心区蚱蜢莺的领地占领顺序和种群数量变化 Locustella naevia

Ornis Svecica Pub Date : 2024-06-03 DOI: 10.34080/os.v34.22262

Jonas Engzell

{"title":"Territory occupation sequence and population change 2005–2019 in a satellite versus core area for Grasshopper Warblers Locustella naevia","authors":"Jonas Engzell","doi":"10.34080/os.v34.22262","DOIUrl":"https://doi.org/10.34080/os.v34.22262","url":null,"abstract":"Because of habitat preferences and variation at a landscape level, a species’ distribution tends to show a level of aggregation. In the Grasshopper Warbler Locustella naevia, the distribution is linked to suitable breeding habitats of open grassy and herbaceous grounds, often adjacent to water. Consequently, the presence of the Grasshopper Warbler at landscape level will consist of core and satellite areas. In theory, birds can sense habitat quality and should occupy territories within those areas based on territory quality. It might also result in different population trends between different areas in the landscape. I tested these assumptions through a 15-year study in a satellite area, comparing the results to a nearby core area. In both areas, the males occupy a territory based on the perceived attractiveness, and general patterns of the territory utilization were similar between areas. Territory density was lower and the males arrived later in the satellite area, thereby confirming the satellite/core area relationship between the study areas. In the core area, no significant change in population size was noted, while in the satellite area, the population decreased significantly.","PeriodicalId":52418,"journal":{"name":"Ornis Svecica","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-06-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141272327","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Densities of Eurasian Three-toed Woodpecker Picoides tridactylus and sap trees correlate across a latitudinal gradient in Sweden 瑞典纬度梯度上欧亚三趾啄木鸟 Picoides tridactylus 的密度与树液树的相关性

Ornis Svecica Pub Date : 2024-05-14 DOI: 10.34080/os.v34.23901

Björn Ferry, Johan Ekenstedt, Martin Green

{"title":"Densities of Eurasian Three-toed Woodpecker Picoides tridactylus and sap trees correlate across a latitudinal gradient in Sweden","authors":"Björn Ferry, Johan Ekenstedt, Martin Green","doi":"10.34080/os.v34.23901","DOIUrl":"https://doi.org/10.34080/os.v34.23901","url":null,"abstract":"Mapping of sap rows on trees has been proposed to detect the easily overlooked Eurasian Three-toed Woodpecker Picoides tridactylus in boreal forests. Sap rows have a distinct appearance that can be detected in the bark for many years. While it is well-established that Eurasian Three-toed Woodpeckers make sap rows on coniferous trees, it is uncertain whether they also make sap rows on deciduous trees, such as birches (Betula sp.), or if these are made by other woodpecker species. We collated data on woodpecker abundance from the Swedish Bird Survey’s fixed route monitoring scheme and correlated this with data on sap tree abundance from systematic searches in three different parts of Sweden. Assuming that species-specific woodpecker behaviours are similar across Sweden, we suggest that Eurasian Three-toed Woodpeckers are responsible for the majority of sap rows on birches in the central and northern parts of Sweden, while Great Spotted Woodpeckers Dendrocopos major made the few sap rows found in southern Sweden and likely some of those further north. With that caveat in mind, our findings might be used to develop a more efficient method of mapping Eurasian Three-toed Woodpecker abundance in Sweden.","PeriodicalId":52418,"journal":{"name":"Ornis Svecica","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-05-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140981668","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Färgvariation hos vattenpiplärka Anthus spinoletta i vinterdräkt 水鸻冬季羽色的变化

Ornis Svecica Pub Date : 2024-05-08 DOI: 10.34080/os.v34.25148

Reino Andersson

引用次数: 0

The influence of climate change on brood size and breeding time in three tit species in Sweden, 1962–2019 1962-2019年气候变化对瑞典三种山雀育雏规模和繁殖时间的影响

Ornis Svecica Pub Date : 2024-03-26 DOI: 10.34080/os.v34.26122

Hans Ryttman

引用次数: 0

I trygg hamn 安全港湾

Ornis Svecica Pub Date : 2024-03-08 DOI: 10.34080/os.v34.26038

Jonas Waldenström, Martin Stervander

引用次数: 0

Pärlugglans Aegolius funereus häckningsekologi i en jämtländsk population 1976–1985 1976-1985 年耶姆特兰谷仓鸮 Aegolius funereus 的繁殖生态。

Ornis Svecica Pub Date : 2024-03-08 DOI: 10.34080/os.v34.23521

Thomas Holmberg

{"title":"Pärlugglans Aegolius funereus häckningsekologi i en jämtländsk population 1976–1985","authors":"Thomas Holmberg","doi":"10.34080/os.v34.23521","DOIUrl":"https://doi.org/10.34080/os.v34.23521","url":null,"abstract":"A long-term Boreal Owl Aegolius funereus nest box project ran 1976–1985 in central Sweden. Average occupancy among 200 nest boxes was 16% (range 0–54%) with average clutch size 6.0 eggs and number of fledged per successful breeding 4.6, while 41% of breeding attempts failed, primarily due to predation by pine marten Martes martes or desertion by the female. The highest observed breeding density was 0.9 breedings/km2. Five cases of bigamy were observed. Females weighed 50% more than males during egg laying and incubation, probably because of pre-emptive weight gain to compensate for the risk of subsequent changes to food availability. The male provisioned both the female and chicks for most of the breeding period, mainly with small rodents (87%). Population sizes of small rodents fluctuated in 3–4-year cycles. Reproduction was successful during phases of increasing rodent density (1977–1978, 1980–1981, and 1984–1985), while almost no breedings were initiated during nadir years (1976, 1979, and 1982–1983). Ringing recoveries suggested that juveniles recruited into the local population in years with abundant food resources, but dispersed if food availability was declining. Adult females were often nomadic, while most males were resident.","PeriodicalId":52418,"journal":{"name":"Ornis Svecica","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-03-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140257682","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0