Food Webs最新文献

{"title":"Do marine food subsidies predict large scale distribution of scavenging seabirds within the Bay of Biscay?","authors":"M. Huon ,&nbsp;G. Dorémus ,&nbsp;M. Authier ,&nbsp;J. Spitz","doi":"10.1016/j.fooweb.2024.e00367","DOIUrl":"10.1016/j.fooweb.2024.e00367","url":null,"abstract":"<div><div>Omnivorous and opportunistic species have the potential to exploit human food subsidies. In marine ecosystem, understanding interaction between seabirds and fishery activities, particularly their scavenging behaviour on discards is crucial nowadays, in the context of EU landing obligation. The Bay of Biscay is one of the major fishing zones in Europe and a central area for the wintering of a high number of seabird species. During spring and autumn, oceanographic surveys were conducted by the R/V Thalassa with the aim to evaluate fishing resources along transects over the continental shelf, thereby providing an opportunity to study the distribution and scavenging behaviour of seabirds in this area. We investigated the influence of fishery activities (i.e. distribution of professional fishing vessels, quantity of discards) at large scale, and oceanographic conditions on the distribution of scavenging seabirds along the continental shelf. On average, large gulls (Larus spp) and northern gannets accounted for 70 % of the seabirds scavenging on discards. We compared model predictions using oceanographic variables with those using both oceanographic variables and fishery activities, in separate for spring and autumn and group of seabirds (i.e. large gulls and northern gannets). Results suggested that the distribution of scavenging seabirds was better predicted by oceanographic variables than by fishery activities. The predicted numbers of scavenging seabirds were higher in autumn than in spring, probably due to the annual cycle of seabirds (i.e. breeding versus wintering). At large scale, oceanographic variables were better predictors of suitable habitat. However, a closer evaluation of prediction differences between the two models highlighted high anomaly values for large gulls in autumn along the coast, that may indicate over predictions. These results have provided new knowledge on the ecology of scavenging seabirds, in an area with high fishery activity, especially in the context of landing obligation.</div></div>","PeriodicalId":38084,"journal":{"name":"Food Webs","volume":"41 ","pages":"Article e00367"},"PeriodicalIF":1.8,"publicationDate":"2024-10-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142421052","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Endemic and elusive trophic interactions: The first comprehensive description of the diet of short-eared dogs (Atelocynus microtis) in Amazon rainforests","authors":"Patrick S. Champagne ,&nbsp;Hernani F.M. Oliveira ,&nbsp;Carter J. Payne ,&nbsp;Renata Leite Pitman","doi":"10.1016/j.fooweb.2024.e00366","DOIUrl":"10.1016/j.fooweb.2024.e00366","url":null,"abstract":"<div><div>The short-eared dog (<em>Atelocynus microtis</em>) is the only endemic Amazonian canid species, which is also elusive and rarely recorded across its distribution, making it one of the least known canid species in the world. Even though it is considered to be a carnivore species, it has been reported to consume other food items, such as fruits. However, no comprehensive analysis of its diet is currently available in the literature. Here we report the first comprehensive analysis of the diet of wild and re-introduced individuals of <em>A. microtis</em> in the western Amazon (southeastern Peru). Its diet includes at least 34 distinct food items, including arthropods, vertebrates (fish, amphibians, reptiles, birds, and mammals), fruits, and seeds. Our study confirms the potential of <em>A. microtis</em> to be considered omnivorous, as well as expands the known range of food items in its diet. As a mesocarnivore with an omnivorous diet, <em>A. microtis</em> has important potential implications for forest dynamics, such as seed dispersal and regulating prey populations, which should be further investigated.</div></div>","PeriodicalId":38084,"journal":{"name":"Food Webs","volume":"41 ","pages":"Article e00366"},"PeriodicalIF":1.8,"publicationDate":"2024-09-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142327104","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Unknown scavenging habits of an elusive tropical Andean mammal","authors":"Tatiana Pessano-Serrat ,&nbsp;Esther Sebastián-González ,&nbsp;Marek Castel-Tapia ,&nbsp;Diego Quiñones-Sánchez ,&nbsp;Adrian Orihuela-Torres","doi":"10.1016/j.fooweb.2024.e00361","DOIUrl":"10.1016/j.fooweb.2024.e00361","url":null,"abstract":"<div><div>There is a significant gap in knowledge regarding the basic ecology of many mammal species that inhabit the Neotropical region. The mountain paca (<em>Cuniculus taczanowskii</em>) is an elusive Neotropical rodent, catalogued as “Near Threatened” by the IUCN and whose ecology is largely unknow. To better understand its dietary ecology, we first conducted a literature review on its diet, determining it as primarily herbivorous-frugivorous. However, through a field experiment using photo-trapping in the Madrigal del Podocarpus Reserve (southern Ecuador) to identify the vertebrate scavenger assemblage, we documented for the first time, an unexpected behaviour of this species consuming a significant amount of carrion. This unexpected finding challenges previous assumptions about the mountain paca's diet and raises important questions about its ecological role and the importance of carrion in ecosystems. Our study underscores the need to further explore carrion ecology and its significance in the understudied and biodiverse tropical Andes.</div></div>","PeriodicalId":38084,"journal":{"name":"Food Webs","volume":"41 ","pages":"Article e00361"},"PeriodicalIF":1.8,"publicationDate":"2024-09-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142322345","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Dietary analysis using prey-DNA metabarcoding from fecal samples of the generalist arthropod predator, Eremias argus","authors":"Jaejin Park ,&nbsp;Il-Kook Park ,&nbsp;Jongsun Kim,&nbsp;Daesik Park","doi":"10.1016/j.fooweb.2024.e00365","DOIUrl":"10.1016/j.fooweb.2024.e00365","url":null,"abstract":"<div><div>Species-specific dietary information contributes to the conservation of biodiversity and an understanding of the trophic structure of habitats. To investigate the diet of the Mongolian racerunner (<em>Eremias argus</em>), classified as an endangered species in the Republic of Korea, we analyzed its fecal samples using metabarcoding with the arthropod mitochondrial cytochrome <em>c</em> oxidase subunit I (<em>COI</em>) universal primer. In our study, 53 prey taxa were detected in 41 genera, 26 families, 8 orders, and 2 classes (Insecta and Arachnida), and 30 (56.6 %) were identified at the species level. Lepidoptera were the most abundant prey source, accounting for 57.4 % of the total identified prey taxa, followed by Coleoptera (11.3 %), Orthoptera (7.5 %), and Araneae (7.5 %). Compared to previous studies, our approaches were more efficient in detecting various and specific prey types of <em>E. argus</em>, known as a generalist predator. We also discussed the shortcomings of metabarcoding dietary analysis in brief. Overall, our results show that the fecal DNA metabarcoding approach is appropriate for studying the diet of <em>E. argus, an</em> arthropod generalist, and that our results may contribute to the conservation of this endangered species.</div></div>","PeriodicalId":38084,"journal":{"name":"Food Webs","volume":"41 ","pages":"Article e00365"},"PeriodicalIF":1.8,"publicationDate":"2024-09-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142311322","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Trophic cascades and climate change","authors":"William J. Ripple ,&nbsp;Danielle N. Whalen ,&nbsp;Christopher Wolf ,&nbsp;Yuanchun Cao ,&nbsp;Jessica Schulte ,&nbsp;Sarah Swann ,&nbsp;Samuel T. Woodrich ,&nbsp;Thomas Newsome ,&nbsp;Rhys Cairncross ,&nbsp;Aaron J. Wirsing","doi":"10.1016/j.fooweb.2024.e00362","DOIUrl":"10.1016/j.fooweb.2024.e00362","url":null,"abstract":"<div><div>The widespread loss of top predators and anthropogenic climate change are two major environmental crises with pervasive impacts on ecosystems. Climate-related factors such as temperature changes, altered precipitation patterns, increased frequency of extreme weather events, and shifting wildfire regimes can influence trophic cascades by affecting the composition, physiology, and behavior of species within an ecosystem. These changes can disrupt food web dynamics, leading to shifts in predator-prey relationships, altered species interactions, and potentially unexpected ecological outcomes. With these potential disruptions in mind, we analyzed climate risks to 360 extant large carnivore species. Our results show that 47 of these species are threatened by climate change. We then considered how trophic cascades and climate change are linked, describing mechanisms through which harnessing trophic cascades can facilitate efforts to improve climate resilience and, conversely, how climate change can trigger or affect the strength and direction of trophic cascades. As major drivers of global change, more efforts are needed by people and governments to address climate change and trophic downgrading together, with a focus on co-benefits, including improved ecosystem function and carbon sequestration.</div></div>","PeriodicalId":38084,"journal":{"name":"Food Webs","volume":"41 ","pages":"Article e00362"},"PeriodicalIF":1.8,"publicationDate":"2024-09-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142319724","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Predation of the social wasp Polybia occidentalis (Hymenoptera:Vespidae) by the water scorpion Ranatra obscura (Hemiptera:Nepidae)","authors":"Eduarda Silva de Lima ,&nbsp;Karina Dias-Silva ,&nbsp;Leandro Juen","doi":"10.1016/j.fooweb.2024.e00364","DOIUrl":"10.1016/j.fooweb.2024.e00364","url":null,"abstract":"<div><div>The genus <em>Ranatra</em> (Nepomorpha) is a formidable predator with significant importance in trophic webs, playing a crucial role in regulating aquatic and semi-aquatic communities through population control. However, studies on the diet of <em>Ranatra</em> species remain scarce, particularly in poorly understood Amazonian regions such as Marajó Island. This lack of data hampers our understanding of species behavior and the development of targeted conservation actions needed to maintain the ecological balance of complex networks, especially in areas under anthropogenic threat. Our study was conducted in the municipality of Salvaterra, within the Marajó Island archipelago, where we observed predation of the predatory species <em>Polybia occidentalis</em> (Olivier, 1791) by <em>Ranatra obscura</em> Montandon, 1907. We captured the insects using a sieve in the water column of a stream, which had been previously divided into three 50-m sections. Subsequently, we monitored <em>Ranatra</em>'s behavior during the predation event, revealing its predatory aggressiveness and hunting ability—traits often underestimated due to its piercing-sucking mouthparts. This new record enhances our understanding of the diet and natural history of Nepomorpha and <em>Ranatra</em>, and highlights the importance of allochthonous material for predator species, revealing their role in terrestrial and semi-aquatic ecological networks.</div></div>","PeriodicalId":38084,"journal":{"name":"Food Webs","volume":"41 ","pages":"Article e00364"},"PeriodicalIF":1.8,"publicationDate":"2024-09-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142311323","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Human-derived food shrinks home ranges and alters resource selection of mammals at the urban-wild interface","authors":"Kelly A. Crandall ,&nbsp;Brent S. Pease ,&nbsp;Jeremy Dixon ,&nbsp;Michael V. Cove","doi":"10.1016/j.fooweb.2024.e00363","DOIUrl":"10.1016/j.fooweb.2024.e00363","url":null,"abstract":"<div><p>Protected lands are an important source of food, shelter, and reproductive opportunities for wildlife, especially in urban landscapes. When urban development abuts the edges of undisturbed ecosystems, synanthropic species can alter their foraging behaviors and movement to utilize human-supplemented resources throughout the urban-wild interface. Therefore, urban development on the edges of protected lands can have pronounced effects on animal movement and ecosystem functions. Iconic urban adaptive mesopredators such as northern raccoons (<em>Procyon lotor</em>) and Virginia opossums (<em>Didelphis virginiana</em>) often benefit from human-supplemented food sources such as unsecured garbage, pet food, and fresh water when available. To investigate how urban edges affect the movements of urban-adapted omnivores within conservation lands, we estimated home ranges and third-order resource selection of 27 raccoons and 12 opossums with GPS collars throughout the protected areas of northern Key Largo, FL, USA between April 2022–October 2023. The proportion of urban development in an individual's home range was the most influential factor associated with home range size, followed by species and sex. Individuals with greater proportions of residential neighborhoods and commercial areas in their home ranges exhibited smaller home ranges. Third-order resource selection functions identified both mesopredator species using residential and commercial land use areas more than they were available on the landscape. These results indicate that urban areas attract urban-adapted mesopredators from protected areas and result in smaller home ranges in the face of abundant human-derived food. Reduced home ranges on edges can support higher densities of animals, which may increase rates of disease transmission, especially when the urban borders support populations of feral domestic species. Shifting foraging behaviors from the protected areas to urban edges could have cascading downward effects if seed-dispersing roles are diluted. As urbanization increases and the distance between wild lands and human disturbance decreases, it is increasingly important to study the mechanisms of how urban development on the edges of protected areas affect the movement of wildlife.</p></div>","PeriodicalId":38084,"journal":{"name":"Food Webs","volume":"41 ","pages":"Article e00363"},"PeriodicalIF":1.8,"publicationDate":"2024-09-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142271891","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Foraging association of Groove-billed Anis with a Giant Anteater in Cojedes, Central-western Venezuelan Llanos","authors":"Juan Carlos Fernández-Ordóñez ,&nbsp;Carlos L. Rivas ,&nbsp;Carmen A. Morante","doi":"10.1016/j.fooweb.2024.e00358","DOIUrl":"10.1016/j.fooweb.2024.e00358","url":null,"abstract":"<div><p>We observed a group of Groove-billed Anis (<em>Crotophaga sulcirostris</em>) foraging and following a walking Giant Anteater (<em>Myrmecophaga tridactyla</em>) in the Cojedes state (Central-western Venezuelan Llanos), using camera traps. We speculate that this behavior might be a mechanism to increase the birds’ foraging effectiveness since the number of prey caught when foraging along with the anteater tended to be high. Commensalism is relatively common in nature, but not easy to observe directly among Neotropical mammals and birds, due to their secretive and cryptic behaviors. Interactions between anis and anteaters had not been previously documented, so this is the first substantiated record of groove-billed anis foraging in association with an anteater. The expansion of camera trap networks in the tropics will likely increase our understanding and observations of commensal foraging behavior among diverse mammalian and avian taxa.</p></div>","PeriodicalId":38084,"journal":{"name":"Food Webs","volume":"40 ","pages":"Article e00358"},"PeriodicalIF":1.8,"publicationDate":"2024-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142148534","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Disentangling the complexity of plant-bird relationships: From monolayer to multilayer network perspectives","authors":"Issaac Azrrael Teodosio Faustino ,&nbsp;Ian MacGregor-Fors ,&nbsp;Miguel Jácome Flores ,&nbsp;Roger Guevara ,&nbsp;Rafael Villegas-Patraca ,&nbsp;Wesley Dáttilo","doi":"10.1016/j.fooweb.2024.e00359","DOIUrl":"10.1016/j.fooweb.2024.e00359","url":null,"abstract":"<div><p>Most plant-bird interaction research employing complex ecological networks focuses on pollination and seed dispersal interactions. However, birds and plants are immersed in a great variety and complexity of direct and indirect relationships. Therefore, the use of multilayer networks (i.e., species interaction networks involving different types of interactions) could provide new insights into the ecological and coevolutionary dynamics of plant-bird relationships. Here, we used a multilayer network approach to determine how a bird-plant interaction network involving different types of interactions (i.e., foraging for invertebrates on plants, frugivory, nectarivory, and perching) is organized in a peri-urban Mexican cloud forest. Moreover, we added information about the interactive roles of the winter migratory and resident birds in the multilayer network. In general, we found that the bird-plant multilayer network exhibits modular but a non-nested structure. We also observed that interactions involving perching and foraging for invertebrates on plants are more frequent than frugivory and nectarivory. Moreover, just a small proportion of birds and plant species were important to the network organization and for connecting different interaction types. In this case, we observed that only two bird species, <em>Cardellina pusilla</em> (Parulidae) and <em>Dumetella carolinesis</em> (Mimidae), and the plant species <em>Telanthophora grandifolia</em> (Asteraceae) and <em>Platanus mexicanus</em> (Platanaceae) presented higher centrality values (i.e., an interactive role). Finally, we found that betweenness values (i.e., the number of times a species acts as a bridge along the shortest path between two species) and network structure's contributions are similar for both migratory and resident bird species. Our results highlight the importance of key interacting species that connect other interacting species for the preservation of community cohesion and to the persistence of species-rich assemblages.</p></div>","PeriodicalId":38084,"journal":{"name":"Food Webs","volume":"40 ","pages":"Article e00359"},"PeriodicalIF":1.8,"publicationDate":"2024-08-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142012955","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"A pilot study on the isotopic characterization of feeding habits of Diptera in a tropical rain forest","authors":"Fujio Hyodo ,&nbsp;Takao Itioka ,&nbsp;Yoshiaki Hashimoto ,&nbsp;Paulus Meleng ,&nbsp;Makoto Tokuda ,&nbsp;Hiroto Nakayama ,&nbsp;Melvin Terry Gumal ,&nbsp;Takuji Tachi","doi":"10.1016/j.fooweb.2024.e00360","DOIUrl":"10.1016/j.fooweb.2024.e00360","url":null,"abstract":"<div><p>Flies (Diptera) are among the most diverse groups of insects and are known to utilize various food resources, including plants, detritus, microbial tissues, and fresh and dead animal tissues. However, their feeding habits in the field remain poorly understood. We conducted a pilot study to apply stable nitrogen (N) and carbon (C) isotope techniques to examine the feeding habits of flies in a tropical rain forest in Sarawak, Malaysia. The fly samples comprised 13 families and &gt;18 species. The results showed significant differences in nitrogen and carbon isotope ratios (δ¹⁵N and δ¹³C) among families and species within a family. The observed pattern is largely consistent with their known feeding habits; flies that use carcasses and carrion as diets (e.g., Sarcophagidae and Calliphoridae) have significantly higher δ¹⁵N values than those likely utilizing plant-based diets (e.g., Cecidomyiidae). There were significant differences in δ¹⁵N values among the six species of Calliphoridae, which is consistent with insect succession on carcasses. The differences in δ¹⁵N may be explained by the use of carrion at different stages of decomposition, because microbial decomposition can lead to the ¹⁵N enrichment. Tachinid flies had relatively low δ¹³C values, reflecting the use of lepidopterans as a host. This pilot study shows that the δ¹⁵N and δ¹³C values of flies provide insights into the diversity of feeding habits of fly communities, which could also serve as an indicator of resource availability in an entire ecosystem.</p></div>","PeriodicalId":38084,"journal":{"name":"Food Webs","volume":"40 ","pages":"Article e00360"},"PeriodicalIF":1.8,"publicationDate":"2024-08-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142012953","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}