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Conservation and management implications of the effects of wildfire on a threatened Eastern Iberian Reed Bunting (Emberiza schoeniclus witherbyi) population 野火对受威胁的伊比利亚东部芦鹀(Emberiza schoeniclus witherbyi)种群的保护和管理影响
IF 1.8 3区 生物学
Ibis Pub Date : 2024-08-14 DOI: 10.1111/ibi.13352
Iván Alambiaga, Pablo Vera, David García, Maties Rebassa, Juan S. Monrós
{"title":"Conservation and management implications of the effects of wildfire on a threatened Eastern Iberian Reed Bunting (Emberiza schoeniclus witherbyi) population","authors":"Iván Alambiaga,&nbsp;Pablo Vera,&nbsp;David García,&nbsp;Maties Rebassa,&nbsp;Juan S. Monrós","doi":"10.1111/ibi.13352","DOIUrl":"10.1111/ibi.13352","url":null,"abstract":"<p>Wetland degradation worldwide has led to fragmentation and isolation of diminished populations that are now more vulnerable to disturbance. Wildfires affecting wetlands can have major impacts on vegetation structure and associated waterbird communities, but rapid recovery of the initial state of vegetation cover after fire due to fast emergent vegetation dynamism has turned prescribed fire into a recurrent management method in these systems. S'Albufera de Mallorca Natural Park (Balearic Islands, Spain) was affected in 2020 by a wildfire that impacted 25% of the wetland area, including territories of Eastern Iberian Reed Bunting <i>Emberiza schoeniclus witherbyi</i>, a nationally critically endangered subspecies. In this study we analysed potential effects of wildfire on the breeding population of this subspecies to determine how active fire management could contribute to its conservation. Specifically, we tested whether there were structural variations in marsh vegetation as well as changes in Eastern Iberian Reed Bunting territory distribution and spatial ecology of breeding males 3 years after the fire. There were no differences in vegetation structure between affected and unaffected areas, but there was an increased density of breeding territories and higher male home-range overlap in affected areas after burning. Home-range size was not influenced by fire but by habitat, with males established in saw sedges having larger home-ranges than those in reed beds, probably due to greater movements in safer saw sedge nesting habitats with lower food availability. Prescribed fire may be a useful and cost-effective conservation tool for Eastern Iberian Reed Bunting populations by creating heterogeneous areas of mixed reed and saw sedge as suitable habitat patches for this subspecies.</p>","PeriodicalId":13254,"journal":{"name":"Ibis","volume":"167 1","pages":"196-211"},"PeriodicalIF":1.8,"publicationDate":"2024-08-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1111/ibi.13352","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142225570","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Hatching asynchrony as a reproductive strategy in birds may explain the hatching failure of the last eggs of the clutch 孵化不同步作为鸟类的一种生殖策略,可以解释最后一窝卵孵化失败的原因
IF 1.8 3区 生物学
Ibis Pub Date : 2024-08-10 DOI: 10.1111/ibi.13354
Manuel Fuertes-Recuero, Davide Baldan, Alejandro Cantarero
{"title":"Hatching asynchrony as a reproductive strategy in birds may explain the hatching failure of the last eggs of the clutch","authors":"Manuel Fuertes-Recuero,&nbsp;Davide Baldan,&nbsp;Alejandro Cantarero","doi":"10.1111/ibi.13354","DOIUrl":"10.1111/ibi.13354","url":null,"abstract":"<p>Hatching failure, due to infertility or embryo mortality, is an important factor contributing to reduced reproductive success in birds. Although hatching failure and its possible causes have been widely investigated, the stage of development at which embryo death occurs and its association with laying order have rarely been studied. The relative size of eggs laid in different positions within the laying order is a key factor that can lead to different parental reproductive strategies, such as hatching asynchrony. Here we investigate hatching failure in relation to laying order by establishing the developmental stage of dead embryos found in unhatched European Pied Flycatcher <i>Ficedula hypoleuca</i> eggs and considering possible causes of failure. We found that variation in egg dimensions showed a quadratic relationship with laying order, with relatively large volumes and sizes in the first and last positions of the clutch. Egg position in the laying sequence was also related to hatching failure, with the first and last positions being more susceptible to failure. The death of embryos late in development was more likely for eggs laid later in the sequence. To our knowledge, this is the first study showing that females may be adaptively allocating more resources to last-laid eggs to avoid competitive disadvantages between siblings, a strategy that seems to fail becasue these eggs suffer greater embryo mortality.</p>","PeriodicalId":13254,"journal":{"name":"Ibis","volume":"167 1","pages":"225-236"},"PeriodicalIF":1.8,"publicationDate":"2024-08-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1111/ibi.13354","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141920239","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
An allometric approach to seasonal changes in intake rates of migratory shorebirds in the Bijagós Archipelago, Guinea-Bissau 几内亚比绍比热戈斯群岛海岸迁徙鸟类摄食率季节性变化的计量方法
IF 1.8 3区 生物学
Ibis Pub Date : 2024-08-09 DOI: 10.1111/ibi.13348
Ana P. Coelho, Afonso D. Rocha, Aissa R. de Barros, Theunis Piersma, José A. Alves
{"title":"An allometric approach to seasonal changes in intake rates of migratory shorebirds in the Bijagós Archipelago, Guinea-Bissau","authors":"Ana P. Coelho,&nbsp;Afonso D. Rocha,&nbsp;Aissa R. de Barros,&nbsp;Theunis Piersma,&nbsp;José A. Alves","doi":"10.1111/ibi.13348","DOIUrl":"10.1111/ibi.13348","url":null,"abstract":"<p>Shorebirds migrating along the East Atlantic Flyway must travel long distances from their breeding sites in arctic and subarctic regions to wintering areas in Europe and Africa. Selecting a winter location is an important decision, as it can have both immediate and future consequences. Shorebirds must ensure they have enough resources to fulfil their energetic requirements during winter, as well as during the fuelling phase, when they must accumulate fat stores for the return migration. Migratory shorebirds are declining worldwide, with several populations wintering in tropical Africa facing steep declines, particularly when compared with their conspecifics wintering in temperate Europe. However, one of the most important wintering sites in Africa remains relatively unstudied, the Bijagós Archipelago, Guinea-Bissau. In this study, we quantify intake rates of eight migratory shorebird species wintering in the Bijagós and explore how these vary throughout their stay in the archipelago. Given the uncertainties associated with measurements of field intake rates, an allometric validation of our approach confirmed a slope comparable to that predicted by theory and verified in many situations. Contrary to our expectations, we found no evidence for an increase in intake rates in the fuelling period; in fact, decreases were noticeable in a few species over the non-breeding season. The allometric relationship across species also confirmed the seasonally decreasing daily energetic intakes, particularly by smaller species. The comparison between the intake rates in the Bijagós and those reported in other wintering sites along the flyway highlights the particularly low values for Ringed Plover <i>Charadrius hiaticula</i>, Curlew Sandpiper <i>Calidris ferruginea</i> and Bar-tailed Godwit <i>Limosa lapponica</i>. Limitations in intake rates and the associated energetic intake suggest that some species may be energetically constrained in the Bijagós, particularly during fuelling.</p>","PeriodicalId":13254,"journal":{"name":"Ibis","volume":"167 1","pages":"161-178"},"PeriodicalIF":1.8,"publicationDate":"2024-08-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141924161","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Bright and early: artificial light affects arrival time, but not group size or vigilance in Little Penguins (Eudyptula minor) 光明与早起:人造光会影响小企鹅(Eudyptula minor)的到达时间,但不会影响其群体大小或警惕性
IF 1.8 3区 生物学
Ibis Pub Date : 2024-08-05 DOI: 10.1111/ibi.13349
Larissa Iasiello, Diane Colombelli-Négrel
{"title":"Bright and early: artificial light affects arrival time, but not group size or vigilance in Little Penguins (Eudyptula minor)","authors":"Larissa Iasiello,&nbsp;Diane Colombelli-Négrel","doi":"10.1111/ibi.13349","DOIUrl":"10.1111/ibi.13349","url":null,"abstract":"<p>Coastal developments are ever-expanding and increasing the use of artificial lights within marine environments. Yet there is conflicting research on the impact of artificial lights on seabirds. Here, we experimentally investigated the impacts of artificial white lights on the behaviours (arrival time, group size, number of groups and vigilance) of breeding Little Penguins <i>Eudyptula minor</i>. Little Penguins are central-place foragers that spend daylight hours foraging at sea and return to their breeding colony after sunset to attend to their chicks or relieve their incubating partners. We exposed Little Penguins returning to their colony at night to either (1) a self-sustaining white LED floodlight or (2) a control system with a decoy light turned ‘off’. We used two different landing sites (site 1, site 2) that differed in landscape characteristics to assess whether behavioural responses to light were site-specific. Little Penguins arrived in larger groups at the landing site 2. Regardless of site, we observed fewer groups that arrived earlier when the light was ‘on’. The effects of artificial light (or ‘lack of artificial light’) on the vigilance of Little Penguins were site-specific, with Little Penguins spending proportionally more time in vigilance when the light was ‘off’ at site 2 compared with site 1. Our results support the idea that artificial lights produced from coastal developments can alter penguin behaviours, but that the effects of artificial lights can be context-dependent and need to be assessed on a case-by-case basis.</p>","PeriodicalId":13254,"journal":{"name":"Ibis","volume":"167 1","pages":"248-262"},"PeriodicalIF":1.8,"publicationDate":"2024-08-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1111/ibi.13349","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141945432","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Elevated testosterone levels during moult have contrasting effects on structural and carotenoid-based plumage colours in Eurasian Blue Tits 蜕皮期间睾酮水平的升高对欧亚蓝山雀羽色结构和类胡萝卜素的影响截然不同
IF 1.8 3区 生物学
Ibis Pub Date : 2024-07-29 DOI: 10.1111/ibi.13347
Lorenzo Serra, Matteo Griggio, Giulia Casasole, Simone Pirrello, Leonida Fusani, Andrea Pilastro
{"title":"Elevated testosterone levels during moult have contrasting effects on structural and carotenoid-based plumage colours in Eurasian Blue Tits","authors":"Lorenzo Serra,&nbsp;Matteo Griggio,&nbsp;Giulia Casasole,&nbsp;Simone Pirrello,&nbsp;Leonida Fusani,&nbsp;Andrea Pilastro","doi":"10.1111/ibi.13347","DOIUrl":"10.1111/ibi.13347","url":null,"abstract":"<p>Feather colours can be produced by the organization of feather microstructure, by pigmentation (mainly due to melanins and carotenoids) or both. The expression of feather colours is usually influenced by testosterone (T) levels through several interacting mechanisms. First, high T levels can negatively affect bird condition and hence the expression of condition-dependent feather colours (e.g. carotenoid-based colours). Secondly, high levels of T can slow moult progression, which in turn may result in brighter colours, as moult speed has been shown to be negatively correlated with the expression of feather colours. Thirdly, T can affect the bioavailability of pigments that are involved in feather colours. The effect of experimental manipulation of T levels may therefore influence, either positively or negatively, feather colour expression according to the relative importance of these mechanisms and the type of coloration involved. We experimentally investigated whether plumage coloration is affected by T in yearling Eurasian Blue Tits <i>Cyanistes caeruleus.</i> We implanted 11 males and 11 females with T (T-birds) at the onset of their post-juvenile moult and compared the spectral reflectance of their structural ultraviolet (UV)/blue colour (crown feathers and upper lesser wing-coverts) and carotenoid-based yellow colour (breast feathers) with those of control birds (C-birds) that were sham-implanted (12 males, 16 females). At the implant date, all the right lesser wing-coverts were plucked in both experimental groups to test the effect of T on feathers grown exclusively during our treatment. After 40 days, the implants were removed. Two weeks before removing the implants, the mean T plasma levels were assayed (average 3.21 ng/mL in T-birds and 0.33 ng/mL in C-birds). In T-birds, body moult progression was suspended, and moult was resumed 33 days after implant removal. Moult duration from implant date, excluding suspension, did not differ between treatments and controls. T had a negative effect on UV coloration only in plumage that started growing exclusively during the treatment (right lesser wing-coverts), and not in other UV/blue plumage. In contrast, the carotenoid-based yellow coloration of the breast increased in T-birds, suggesting an immediate effect of T on the mobilization of carotenoids available for ornamentation. Despite sexual dichromatism, T treatment had similar effects in the two sexes. Our results highlight the importance of considering the effect of T on moult speed and possibly moult suspension in the interpretation of the results of studies based on T manipulation.</p>","PeriodicalId":13254,"journal":{"name":"Ibis","volume":"167 1","pages":"263-276"},"PeriodicalIF":1.8,"publicationDate":"2024-07-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141871842","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Spatio-temporal differences in the diet and trophic ecology of Kelp Gulls (Larus dominicanus) in South Africa 南非海带鸥(Larus dominicanus)食物和营养生态的时空差异
IF 1.8 3区 生物学
Ibis Pub Date : 2024-07-29 DOI: 10.1111/ibi.13344
Katharina Reusch, Maëlle Connan, Peter G. Ryan, Mike Butler, Lorien Pichegru
{"title":"Spatio-temporal differences in the diet and trophic ecology of Kelp Gulls (Larus dominicanus) in South Africa","authors":"Katharina Reusch,&nbsp;Maëlle Connan,&nbsp;Peter G. Ryan,&nbsp;Mike Butler,&nbsp;Lorien Pichegru","doi":"10.1111/ibi.13344","DOIUrl":"10.1111/ibi.13344","url":null,"abstract":"<p>Opportunistic species, including some gulls (Laridae), can benefit from urbanization and increased anthropogenic food resources. Knowledge of the level of exploitation of anthropogenic resources by gulls is crucial to understand how changes in food availability might affect their populations, which in turn may impact other species. The Kelp Gull <i>Larus dominicanus</i> is widely distributed in the southern hemisphere and consumes a wide variety of resources, from waste in landfills to seabirds. We assessed if proximity to landfills influenced the diet and trophic ecology of Kelp Gull incubating adults and chicks using a combination of conventional diet sampling (stomach contents, regurgitated pellets), and carbon and nitrogen stable isotope analysis of blood plasma in seven colonies over two consecutive years in South Africa. Kelp Gulls consumed a variety of resources, including marine (e.g. fish), coastal (e.g. molluscs), terrestrial natural (e.g. insects, mammals), or terrestrial anthropogenic (e.g. chicken, bread) items. Inter-annual differences were most apparent among gulls breeding next to a seabird colony, whereas gulls breeding at other colonies were more consistent in diet and trophic ecology. At most colonies, chicks were fed more natural and higher trophic level food items than were consumed by incubating adults. Overall, distance to landfill did not strongly affect the diet and trophic ecology and our results suggest that the Kelp Gull's broad feeding ecology allows it to buffer changes in food availability by switching among food resources. However, such dietary changes triggered by human actions may impact other species, including threatened seabirds.</p>","PeriodicalId":13254,"journal":{"name":"Ibis","volume":"167 1","pages":"124-144"},"PeriodicalIF":1.8,"publicationDate":"2024-07-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141871843","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Estimating the mass of the Great Auk (Pinguinus impennis) and its egg 估算大鸟(Pinguinus impennis)及其卵的质量
IF 1.8 3区 生物学
Ibis Pub Date : 2024-07-26 DOI: 10.1111/ibi.13350
Robert D. Montgomerie, Tim R. Birkhead
{"title":"Estimating the mass of the Great Auk (Pinguinus impennis) and its egg","authors":"Robert D. Montgomerie,&nbsp;Tim R. Birkhead","doi":"10.1111/ibi.13350","DOIUrl":"10.1111/ibi.13350","url":null,"abstract":"<p>The body mass and egg mass of the Great Auk <i>Pinguinus impennis</i> were never measured before the bird was driven to extinction in 1844. Previous studies conducted before 1990 used data from related species to estimate the mass of an adult bird at 4500–5000 g, and the fresh mass of its egg as 327–372 g. In the present study, we use a larger dataset of measurements from extant alcids, and statistical methods that control for the effects of phylogeny, to provide new estimates for those traits. The presumed body mass of the Great Auk was initially derived from a hearsay report from the 19th century, and then supported by subsequent comparative analyses based on skeletal measurements. Our new best estimates from currently available data show that the Great Auk's body mass was probably closer to 3560 g and its fresh egg mass was about 350 g. This new body mass estimate is the average of predictions from independent regressions of body mass on (1) tibiotarsus and femur lengths (3441 g) and (2) egg volume (3681 g). We calculated the Great Auk's fresh egg mass from a regression of fresh egg mass on egg volume in the extant alcids. Providing more accurate estimates of the body and egg mass of Great Auk can inform speculation about the developmental mode, ecology and life history of this iconic, extinct species.</p>","PeriodicalId":13254,"journal":{"name":"Ibis","volume":"167 1","pages":"237-247"},"PeriodicalIF":1.8,"publicationDate":"2024-07-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1111/ibi.13350","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141782053","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Diet diversity, individual heterozygosity and habitat heterogeneity influence health parameters in Eurasian Kestrels (Falco tinnunculus) 饮食多样性、个体杂合度和栖息地异质性对欧亚红隼健康参数的影响
IF 1.8 3区 生物学
Ibis Pub Date : 2024-07-17 DOI: 10.1111/ibi.13345
Lukas Hochleitner, Erkki Korpimäki, Nayden Chakarov, Caroline Isaksson, Carina Nebel, Swen C. Renner, Ville Vasko, Christian C. Voigt, Julien Terraube, Petra Sumasgutner
{"title":"Diet diversity, individual heterozygosity and habitat heterogeneity influence health parameters in Eurasian Kestrels (Falco tinnunculus)","authors":"Lukas Hochleitner,&nbsp;Erkki Korpimäki,&nbsp;Nayden Chakarov,&nbsp;Caroline Isaksson,&nbsp;Carina Nebel,&nbsp;Swen C. Renner,&nbsp;Ville Vasko,&nbsp;Christian C. Voigt,&nbsp;Julien Terraube,&nbsp;Petra Sumasgutner","doi":"10.1111/ibi.13345","DOIUrl":"10.1111/ibi.13345","url":null,"abstract":"<p>The loss of habitat heterogeneity due to agricultural intensification has led to a global decline in farmland birds. Among them is the Eurasian Kestrel <i>Falco tinnunculus</i>, which occupies high trophic levels and may be adversely affected by reduced food quantity or quality and consequent health impacts. In this study, we investigate the effects of habitat heterogeneity, individual heterozygosity and diet diversity on five different health indices (integument coloration, dietary antioxidants, haematocrit, body condition and parasite infection). The study was conducted in farmland areas of western Finland during a year of exceptionally low vole abundance. We found no obvious relationship between diet diversity and habitat heterogeneity. An interaction between diet diversity and individual heterozygosity in females suggested that diet specialists were able to maintain more intensely coloured integuments only if they had higher genetic diversity. In addition, more heterozygous females were less likely to be infected with <i>Haemoproteus</i> than females with lower individual genetic diversity. Finally, specialist males with lower diet diversity had higher body condition than males with a more generalist diet. Our results suggest that variation in individual quality and foraging ecology should be considered in conjunction with spatial variation in habitat heterogeneity to understand sex-specific variation in kestrel health. These findings add to a better understanding of the mechanisms linking land-use change to health indices in a common avian predator, which can be used as a health sentinel in European agroecosystems.</p>","PeriodicalId":13254,"journal":{"name":"Ibis","volume":"167 1","pages":"145-160"},"PeriodicalIF":1.8,"publicationDate":"2024-07-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1111/ibi.13345","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141738045","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Experimental manipulation of nest temperature and relative humidity reduces ectoparasites and affects body condition of Blue Tits (Cyanistes caeruleus) 通过实验控制巢穴温度和相对湿度减少外寄生虫并影响蓝山雀的身体状况
IF 1.8 3区 生物学
Ibis Pub Date : 2024-07-10 DOI: 10.1111/ibi.13346
Marina García-del Río, Alejandro Cantarero, Francisco Castaño-Vázquez, Yago Merino, Javier García-Velasco, Santiago Merino
{"title":"Experimental manipulation of nest temperature and relative humidity reduces ectoparasites and affects body condition of Blue Tits (Cyanistes caeruleus)","authors":"Marina García-del Río,&nbsp;Alejandro Cantarero,&nbsp;Francisco Castaño-Vázquez,&nbsp;Yago Merino,&nbsp;Javier García-Velasco,&nbsp;Santiago Merino","doi":"10.1111/ibi.13346","DOIUrl":"10.1111/ibi.13346","url":null,"abstract":"<p>Many models predict changes in the distribution and incidence of diseases associated with climate change. However, studies exploring the effect of microclimatic changes on host–parasite relationships are scarce. In this study, we increased temperature or humidity in Eurasian Blue Tit <i>Cyanistes caeruleus</i> nestboxes during the breeding season, to analyse the effect of each variable on the abundance of ectoparasites and, also, on the body condition of the hosts. Temperature and humidity were experimentally increased on average by about 2°C and 15%, respectively. The abundance of blowfly <i>Protocalliphora azurea</i> pupae was significantly reduced in nests with increased temperature compared with control nests and those with increased humidity, and was also significantly reduced in nests with increased humidity compared with control nests. The abundance of mites <i>Dermanyssus</i> spp. was significantly reduced in nests with increased humidity. However, there was no significant effect of the experiment on the abundance of flea <i>Ceratophyllus gallinae</i> larvae, biting midges (<i>Culicoides</i> spp.) and blackflies (Simuliidae). The body condition of nestlings was lower in nests with increased humidity and slightly lower in heated nests. However, the body condition of adults was not significantly affected by the experiment. In addition, blowfly pupae and biting midge abundance were negatively related to the body condition of the nestlings, and biting midge abundance was also negatively related to the body condition of the adults. Overall, an increase in temperature and humidity reduces the abundance of ectoparasites, which suggests that these parasites are sensitive to sudden changes in the microclimate in which they develop. Moreover, these fluctuations negatively affect the body condition of Blue Tit nestlings despite the concurrent decrease of parasites in nests. In other words, the expected benefit to the nestlings from the reduction in parasites does not occur because the microclimate also adversely affects nestlings, probably affecting their heat exchange with the nest environment.</p>","PeriodicalId":13254,"journal":{"name":"Ibis","volume":"167 1","pages":"212-224"},"PeriodicalIF":1.8,"publicationDate":"2024-07-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1111/ibi.13346","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141585213","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Body mass, diet, foraging strata and foraging behaviour predict variation in the propensity to join mixed-species flocks across birds 体重、饮食、觅食阶层和觅食行为可预测鸟类加入混种鸟群倾向的变化
IF 1.8 3区 生物学
Ibis Pub Date : 2024-07-03 DOI: 10.1111/ibi.13342
Guy Beauchamp, G. Giselle Mangini
{"title":"Body mass, diet, foraging strata and foraging behaviour predict variation in the propensity to join mixed-species flocks across birds","authors":"Guy Beauchamp,&nbsp;G. Giselle Mangini","doi":"10.1111/ibi.13342","DOIUrl":"10.1111/ibi.13342","url":null,"abstract":"<p>Mixed-species flocking is common in birds and is associated with increased foraging efficiency and reduced predation pressure. The propensity to join mixed-species flocks within a community varies across species, possibly reflecting species-specific needs for increased protection from predators, opportunities to increase foraging efficiency or both. Previous studies on predictors of mixed-species flocking propensity across species have typically focused on local communities, with or without accounting for phylogenetic relatedness. Here, we examined predictors of mixed-species flocking propensity across the published literature using a phylogenetic linear mixed model framework. We obtained 724 mixed-species flocking propensity estimates from 31 different study sites located primarily in South America and East Asia. Flocking propensity was associated with diet, foraging strata and foraging behaviour, and was inversely related to body mass. Controlling for phylogeny and body mass, flocking propensity was significantly lower for nectarivores than for species with other diets, lower for species foraging on the ground than in higher strata, and lower for sallying species than for bark and near-perch foragers. These results suggest that variation across species in the tendency to join mixed-species flocks can be predicted from knowledge about various species-specific ecological traits in birds.</p>","PeriodicalId":13254,"journal":{"name":"Ibis","volume":"166 4","pages":"1384-1394"},"PeriodicalIF":1.8,"publicationDate":"2024-07-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141546464","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
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