Oecologia最新文献_第6页

Hurricanes temporarily weaken human-ecosystem linkages in estuaries. 飓风暂时削弱了河口地区人类与生态系统之间的联系。

IF 2.3 2区环境科学与生态学

Oecologia Pub Date : 2024-08-01 Epub Date: 2024-07-15 DOI: 10.1007/s00442-024-05592-1

Joseph W Reustle, Benjamin A Belgrad, Evan Pettis, Delbert L Smee

{"title":"Hurricanes temporarily weaken human-ecosystem linkages in estuaries.","authors":"Joseph W Reustle, Benjamin A Belgrad, Evan Pettis, Delbert L Smee","doi":"10.1007/s00442-024-05592-1","DOIUrl":"10.1007/s00442-024-05592-1","url":null,"abstract":"Intense disturbances such as hurricanes may drastically affect ecosystems, producing both acute and long-term changes along coastlines. By disrupting human activities (e.g., fishing), hurricanes can provide an opportunity to quantify the effects of these activities on coastal ecosystems. We performed predator-exclusion experiments on oyster reefs in 2016, one-year before a category-4 hurricane (\"Harvey\") and again in 2018 one-year post-hurricane where the storm made landfall. Additionally, we examined 8 years (2011-2018) of fisheries-independent data to gauge how fishing pressure and fish populations were affected by the storm in three locations that varied in storm impacts. In the month following Hurricane Harvey, fishing effort dropped by 90% in the area with wind and flooding damage, and predatory fish species commonly targeted by anglers were 300% more abundant than the year prior to the hurricane. The locations without damage to fishing infrastructure did not experience declines in fishing pressure or changes in fish abundance, regardless of flooding disturbance. Reef fish and invertebrate communities directly affected by the storm were significantly different after the hurricane and were ~ 30% more diverse. With low fishing pressure, sportfish CPUE were 1.7-6.9 × higher immediately after the hurricane. Intermediate consumers, such as crabs that prey on oysters, were 45% less abundant and 10% smaller. These results indicate that hurricanes can temporarily disrupt human-ecosystem linkages and reconstitute top-down control by sportfish in estuarine food webs. Disturbance events that interrupt or weaken those interactions may yield indirect ecological benefits and provide insights into the effects of human activities on food webs.","PeriodicalId":19473,"journal":{"name":"Oecologia","volume":" ","pages":"545-559"},"PeriodicalIF":2.3,"publicationDate":"2024-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141620532","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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}

引用次数: 0

Effects of amphibian genetic diversity on ecological communities. 两栖动物遗传多样性对生态群落的影响。

IF 2.3 2区环境科学与生态学

Oecologia Pub Date : 2024-08-01 Epub Date: 2024-07-30 DOI: 10.1007/s00442-024-05599-8

Michael F Benard, David J Burke, Sarah R Carrino-Kyker, Katherine Krynak, Rick A Relyea

{"title":"Effects of amphibian genetic diversity on ecological communities.","authors":"Michael F Benard, David J Burke, Sarah R Carrino-Kyker, Katherine Krynak, Rick A Relyea","doi":"10.1007/s00442-024-05599-8","DOIUrl":"10.1007/s00442-024-05599-8","url":null,"abstract":"The amount of genetic diversity within a population can affect ecological processes at population, community, and ecosystem levels. However, the magnitude, consistency, and scope of these effects are largely unknown. To investigate these issues, we conducted two experiments manipulating the amount of genetic diversity and environmental factors in larval amphibians. The first experiment manipulated wood frog genetic diversity, the presence or absence of caged predators, and competition from leopard frogs to test whether these factors affected survival, growth, and morphology of wood frogs and leopard frogs. The second experiment manipulated wood frog genetic diversity, the presence or absence of uncaged predators, and resource abundance to test whether these factors affected wood frog traits (survival, morphology, growth, development, and behavior) and other components of the ecological community (zooplankton abundance, phytoplankton, periphyton, and bacterial community structure). Genetic diversity did not affect wood frog survival, growth, and development in either experiment. However, genetic diversity did affect the mean morphology of wood frog tadpoles in the first experiment and the abundance and distribution of zooplankton in the second experiment. It did not affect phytoplankton abundance, periphyton abundance, or bacterial community structure. While effect sizes (Cohen's d) of genetic diversity were approximately half those of environment treatments, the greatest effect sizes were for interaction effects between genetic diversity and environment. Our results indicate that genetic diversity can have a large effect on ecological processes, but the direction of those effects is highly dependent upon environmental conditions, and not easily predicted from simple measures of traits.","PeriodicalId":19473,"journal":{"name":"Oecologia","volume":" ","pages":"655-667"},"PeriodicalIF":2.3,"publicationDate":"2024-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141792996","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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}

引用次数: 0

Resource use differences of two coexisting chironomid species at localized scales. 两种共存摇蚊在局部尺度上的资源利用差异。

IF 2.3 2区环境科学与生态学

Oecologia Pub Date : 2024-08-01 Epub Date: 2024-07-01 DOI: 10.1007/s00442-024-05584-1

Amanda R McCormick, Joseph S Phillips, Jamieson C Botsch, Jón S Ólafsson, Anthony R Ives

{"title":"Resource use differences of two coexisting chironomid species at localized scales.","authors":"Amanda R McCormick, Joseph S Phillips, Jamieson C Botsch, Jón S Ólafsson, Anthony R Ives","doi":"10.1007/s00442-024-05584-1","DOIUrl":"10.1007/s00442-024-05584-1","url":null,"abstract":"Competing species may show positive correlations in abundance through time and space if they rely on a shared resource. Such positive correlations might obscure resource partitioning that facilitates competitor coexistence. Here, we examine the potential for resource partitioning between two ecologically similar midge species (Diptera: Chironomidae) in Lake Mývatn, Iceland. Tanytarsus gracilentus and Chironomus islandicus show large, roughly synchronized population fluctuations, implying potential reliance on a shared fluctuating resource and thereby posing the question of how these species coexist at high larval abundances. We first considered spatial partitioning of larvae. Abundances of both species were positively correlated in space; thus, spatial partitioning across different sites in the lake did not appear to be strong. We then inferred differences in dietary resources with stable carbon isotopes. T. gracilentus larvae had significantly higher δ13C values than C. islandicus, suggesting interspecific differences in resource use. Differences in resource selectivity, tube-building behavior, and feeding styles may facilitate resource partitioning between these species. Relative to surface sediments, T. gracilentus had higher δ13C values, suggesting that they selectively graze on 13C-enriched resources such as productive algae from the surface of their tubes. In contrast, C. islandicus had lower δ13C values than surface sediments, suggesting reliance on 13C-depleted resources that may include detrital organic matter and associated microbes that larvae selectively consume from the sediment surface or within their burrow walls. Overall, our study illustrates that coexisting and ecologically similar species may show positive correlations in space and time while using different resources at fine spatial scales.","PeriodicalId":19473,"journal":{"name":"Oecologia","volume":" ","pages":"473-485"},"PeriodicalIF":2.3,"publicationDate":"2024-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141477106","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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}

引用次数: 0

Intraspecific variation in crayfish behavioral traits affects leaf litter breakdown in streams. 小龙虾行为特征的种内变异会影响溪流中的叶屑分解。

IF 2.3 2区环境科学与生态学

Oecologia Pub Date : 2024-08-01 Epub Date: 2024-07-12 DOI: 10.1007/s00442-024-05593-0

Bana A Kabalan, Alexander J Reisinger, Lauren M Pintor, Marco A Scarasso, Lindsey S Reisinger

{"title":"Intraspecific variation in crayfish behavioral traits affects leaf litter breakdown in streams.","authors":"Bana A Kabalan, Alexander J Reisinger, Lauren M Pintor, Marco A Scarasso, Lindsey S Reisinger","doi":"10.1007/s00442-024-05593-0","DOIUrl":"10.1007/s00442-024-05593-0","url":null,"abstract":"Although intraspecific trait variation is increasingly recognized as affecting ecosystem processes, few studies have examined the ecological significance of among-population variation in behavioral traits in natural ecosystems. In freshwater habitats, crayfish are consumers that can influence ecosystem structure (e.g., macroinvertebrate communities) and function (e.g., leaf litter breakdown). To test whether crayfish behavioral traits (activity, boldness, and foraging voracity) are major contributors of leaf litter breakdown rates in the field, we collected rusty crayfish (Faxonius rusticus) from eight streams across the midwestern USA and measured behaviors using laboratory assays. At the same streams, we measured breakdown rates of leaf packs that were accessible or inaccessible to crayfish. Our results provide evidence that among-population variation in crayfish boldness and foraging voracity was a strong predictor of leaf litter breakdown rates, even after accounting for commonly appreciated environmental drivers (water temperature and human land use). Our results suggest that less bold rusty populations (i.e., emerged from shelter more slowly) had greater direct impacts on leaf litter breakdown than bold populations (P = 0.001, r2 = 0.85), potentially because leaf packs can be both a shelter and food resource to crayfish. Additionally, we found that foraging voracity was negatively related to breakdown rates in leaf packs that were inaccessible to crayfish (P = 0.025, r2 = 0.60), potentially due to a trophic cascade from crayfish preying on other invertebrates that consume leaf litter. Overall, our results add to the growing evidence that trait variation in animals may be important for understanding freshwater ecosystem functioning.","PeriodicalId":19473,"journal":{"name":"Oecologia","volume":" ","pages":"515-531"},"PeriodicalIF":2.3,"publicationDate":"2024-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141590876","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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}

引用次数: 0

Paralog switching facilitates diadromy: ontogenetic, microevolutionary and macroevolutionary evidence. 旁系亲属切换促进双色性：本体进化、微进化和宏进化的证据

IF 2.3 2区环境科学与生态学

Oecologia Pub Date : 2024-08-01 Epub Date: 2024-07-16 DOI: 10.1007/s00442-024-05588-x

Rebecca S Colby, Stephen D McCormick, Jonathan P Velotta, Elizabeth Jockusch, Eric T Schultz

{"title":"Paralog switching facilitates diadromy: ontogenetic, microevolutionary and macroevolutionary evidence.","authors":"Rebecca S Colby, Stephen D McCormick, Jonathan P Velotta, Elizabeth Jockusch, Eric T Schultz","doi":"10.1007/s00442-024-05588-x","DOIUrl":"10.1007/s00442-024-05588-x","url":null,"abstract":"Identifying how the demands of migration are met at the level of gene expression is critical for understanding migratory physiology and can potentially reveal how migratory forms evolve from nonmigratory forms and vice versa. Among fishes, migration between freshwater and seawater (diadromy) requires considerable osmoregulatory adjustments, powered by the ion pump Na+, K+-ATPase (NKA) in the gills. Paralogs of the catalytic α-subunit of the pump (NKA α1a and α1b) are reciprocally upregulated in fresh- and seawater, a response known as paralog-switching, in gills of some diadromous species. We tested ontogenetic changes in NKA α-subunit paralog expression patterns, comparing pre-migrant and migrant alewife (Alosa pseudoharengus) sampled in their natal freshwater environment and after 24 h in seawater. In comparison to pre-migrants, juvenile out-migrants exhibited stronger paralog switching via greater downregulation of NKA α1a in seawater. We also tested microevolutionary changes in the response, exposing juvenile diadromous and landlocked alewife to freshwater (0 ppt) and seawater (30 ppt) for 2, 5, and 15 days. Diadromous and landlocked alewife exhibited salinity-dependent paralog switching, but levels of NKA α1b transcription were higher and the decrease in NKA α1a was greater after seawater exposure in diadromous alewife. Finally, we placed alewife α-subunit NKA paralogs in a macroevolutionary context. Molecular phylogenies show alewife paralogs originated independently of paralogs in salmonids and other teleosts. This study demonstrated that NKA paralog switching is tied to halohabitat profile and that duplications of the NKA gene provided the substrate for multiple, independent molecular solutions that support a diadromous life history.","PeriodicalId":19473,"journal":{"name":"Oecologia","volume":" ","pages":"571-586"},"PeriodicalIF":2.3,"publicationDate":"2024-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141620533","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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}

引用次数: 0

Complex and highly saturated soundscapes in restored oak woodlands reflect avian richness and abundance. 恢复后的橡树林地中复杂而高饱和度的声音景观反映了鸟类的丰富性和多样性。

IF 2.3 2区环境科学与生态学

Oecologia Pub Date : 2024-08-01 Epub Date: 2024-07-23 DOI: 10.1007/s00442-024-05598-9

Maia E Persche, H S Sathya Chandra Sagar, Zuzana Burivalova, Anna M Pidgeon

{"title":"Complex and highly saturated soundscapes in restored oak woodlands reflect avian richness and abundance.","authors":"Maia E Persche, H S Sathya Chandra Sagar, Zuzana Burivalova, Anna M Pidgeon","doi":"10.1007/s00442-024-05598-9","DOIUrl":"10.1007/s00442-024-05598-9","url":null,"abstract":"Temperate woodlands are biodiverse natural communities threatened by land use change and fire suppression. Excluding historic disturbance regimes of periodic groundfires from woodlands causes degradation, resulting from changes in the plant community and subsequent biodiversity loss. Restoration, through prescribed fire and tree thinning, can reverse biodiversity losses, however, because the diversity of woodland species spans many taxa, efficiently quantifying biodiversity can be challenging. We assessed whether soundscapes in an eastern North American woodland reflect biodiversity changes during restoration measured in a concurrent multitrophic field study. In five restored and five degraded woodland sites in Wisconsin, USA, we sampled vegetation, measured arthropod biomass, conducted bird surveys, and recorded soundscapes for five days of every 15-day period from May to August 2022. We calculated two complementary acoustic indices: Soundscape Saturation, which focuses on all acoustically active species, and Acoustic Complexity Index (ACI), which was developed to study vocalizing birds. We used generalized additive models to predict both indices based on Julian date, time of day, and level of habitat degradation. We found that restored woodlands had higher arthropod biomass, and higher richness and abundance of breeding birds. Additionally, soundscapes in restored sites had higher mean Soundscape Saturation and higher mean ACI. Restored woodland acoustic indices exhibited greater magnitudes of daily and seasonal peaks. We conclude that woodland restoration results in higher soundscape saturation and complexity, due to greater richness and abundance of vocalizing animals. This bioacoustic signature of restoration offers a promising monitoring tool for efficiently documenting differences in woodland biodiversity.","PeriodicalId":19473,"journal":{"name":"Oecologia","volume":" ","pages":"597-612"},"PeriodicalIF":2.3,"publicationDate":"2024-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141748805","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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}

引用次数: 0

Effects of individual traits vs. trait syndromes on assemblages of various herbivore guilds associated with central European Salix. 个体性状与性状综合体对与中欧莎草相关的各种食草动物群的影响。

IF 2.3 2区环境科学与生态学

Oecologia Pub Date : 2024-08-01 Epub Date: 2024-06-03 DOI: 10.1007/s00442-024-05569-0

Jing V Leong, Priscila Mezzomo, Petr Kozel, Tereza Volfová, Paola de Lima Ferreira, Carlo L Seifert, Phillip T Butterill, Inga Freiberga, Jan Michálek, Pável Matos-Maraví, Alexander Weinhold, Marica T Engström, Juha-Pekka Salminen, Simon T Segar, Brian E Sedio, Martin Volf

{"title":"Effects of individual traits vs. trait syndromes on assemblages of various herbivore guilds associated with central European Salix.","authors":"Jing V Leong, Priscila Mezzomo, Petr Kozel, Tereza Volfová, Paola de Lima Ferreira, Carlo L Seifert, Phillip T Butterill, Inga Freiberga, Jan Michálek, Pável Matos-Maraví, Alexander Weinhold, Marica T Engström, Juha-Pekka Salminen, Simon T Segar, Brian E Sedio, Martin Volf","doi":"10.1007/s00442-024-05569-0","DOIUrl":"10.1007/s00442-024-05569-0","url":null,"abstract":"Plants employ diverse anti-herbivore defences that can covary to form syndromes consisting of multiple traits. Such syndromes are hypothesized to impact herbivores more than individual defences. We studied 16 species of lowland willows occurring in central Europe and explored if their chemical and physical traits form detectable syndromes. We tested for phylogenetic trends in the syndromes and explored whether three herbivore guilds (i.e., generalist leaf-chewers, specialist leaf-chewers, and gallers) are affected more by the detected syndromes or individual traits. The recovered syndromes showed low phylogenetic signal and were mainly defined by investment in concentration, richness, or uniqueness of structurally related phenolic metabolites. Resource acquisition traits or inducible volatile organic compounds exhibited a limited correlation with the syndromes. Individual traits composing the syndromes showed various correlations to the assemblages of herbivores from the three studied guilds. In turn, we found some support for the hypothesis that defence syndromes are composed of traits that provide defence against various herbivores. However, individual traits rather than trait syndromes explained more variation for all studied herbivore assemblages. The detected negative correlations between various phenolics suggest that investment trade-offs may occur primarily among plant metabolites with shared metabolic pathways that may compete for their precursors. Moreover, several traits characterizing the recovered syndromes play additional roles in willows other than defence from herbivory. Taken together, our findings suggest that the detected syndromes did not solely evolve as an anti-herbivore defence.","PeriodicalId":19473,"journal":{"name":"Oecologia","volume":" ","pages":"725-737"},"PeriodicalIF":2.3,"publicationDate":"2024-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141200416","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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}

引用次数: 0

Incorporation of the ¹⁵N-labeled simulated arthropod rain in the soil food web. 15N 标记的模拟节肢动物雨融入土壤食物网。

IF 2.3 2区环境科学与生态学

Oecologia Pub Date : 2024-08-01 Epub Date: 2024-07-18 DOI: 10.1007/s00442-024-05595-y

Oksana L Rozanova, Sergey M Tsurikov, Alexey A Kudrin, Vladislav D Leonov, Marina G Krivosheina, Dmitry N Fedorenko, Andrei V Tanasevitch, Leonid B Rybalov, Alexei V Tiunov

{"title":"Incorporation of the 15N-labeled simulated arthropod rain in the soil food web.","authors":"Oksana L Rozanova, Sergey M Tsurikov, Alexey A Kudrin, Vladislav D Leonov, Marina G Krivosheina, Dmitry N Fedorenko, Andrei V Tanasevitch, Leonid B Rybalov, Alexei V Tiunov","doi":"10.1007/s00442-024-05595-y","DOIUrl":"10.1007/s00442-024-05595-y","url":null,"abstract":"Direct trophic links between aboveground and belowground animal communities are rarely considered in food web models. Most invertebrate animals inhabiting aboveground space eventually become prey of soil predators and scavengers forming a gravity-driven spatial subsidy to detrital food webs, but its importance remains unquantified. We used laboratory-grown 15N-labeled Collembola to trace the incorporation of arthropod rain into soil food webs. Live or euthanized Collembola were supplemented once to field mesocosms in the amount equivalent to the mean daily input of the arthropod rain (19 mg d.w. m-2). After the addition of live Collembola, the isotopic label was found most often in predatory Trombidiformes (83% of samples) and Mesostigmata mites (85%), followed by Araneae (58%), Chilopoda (45%), and Coleoptera (29%). Among non-predatory groups, the isotopic label was recorded in Thysanoptera (27%), Collembola (24%), and Oribatida (18%). The 15N-label was also detected in Symphyla, Formicidae, Diplura, Diplopoda, Opiliones, Diptera, Hemiptera, Oligochaeta, and Nematoda. There was a positive correlation between natural 15N abundance and the frequency of the isotopic label among predators, but not among decomposers. In the non-replicated treatment, in which dead collembolans were added, the label was found in predators and decomposers in approximately equal proportions (21-25%). Unlike other forms of the aboveground subsidy (such as leaf litter, frass, or honeydew) that are primarily processed by microorganisms, arthropod rain is assimilated directly by the animals. The high frequency of consumption of the aboveground subsidy suggests that it plays a significant role in maintaining the abundance of soil predators.","PeriodicalId":19473,"journal":{"name":"Oecologia","volume":" ","pages":"587-596"},"PeriodicalIF":2.3,"publicationDate":"2024-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141724045","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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}

引用次数: 0

IGF-1 induces sex-specific oxidative damage and mortality in a songbird. IGF-1 可诱导鸣禽发生性别特异性氧化损伤和死亡。

IF 2.3 2区环境科学与生态学

Oecologia Pub Date : 2024-08-01 Epub Date: 2024-07-16 DOI: 10.1007/s00442-024-05587-y

Ádám Z Lendvai, Zsófia Tóth, Katharina Mahr, Janka Pénzes, Sarah Vogel-Kindgen, Bruno A Gander, Csongor I Vágási

{"title":"IGF-1 induces sex-specific oxidative damage and mortality in a songbird.","authors":"Ádám Z Lendvai, Zsófia Tóth, Katharina Mahr, Janka Pénzes, Sarah Vogel-Kindgen, Bruno A Gander, Csongor I Vágási","doi":"10.1007/s00442-024-05587-y","DOIUrl":"10.1007/s00442-024-05587-y","url":null,"abstract":"The insulin-like growth factor 1 (IGF-1) is a pleiotropic hormone that regulates essential life-history traits and is known for its major contribution to determining individual ageing processes. High levels of IGF-1 have been linked to increased mortality and are hypothesised to cause oxidative stress. This effect has been observed in laboratory animals, but whether it pertains to wild vertebrates has not been tested. This is surprising because studying the mechanisms that shape individual differences in lifespan is important to understanding mortality patterns in populations of free-living animals. We tested this hypothesis under semi-natural conditions by simulating elevated IGF-1 levels in captive bearded reedlings, a songbird species with an exceptionally fast pace of life. We subcutaneously injected slow-release biodegradable microspheres loaded with IGF-1 and achieved a systemic 3.7-fold increase of the hormone within the natural range for at least 24 h. Oxidative damage to lipids showed marked sexual differences: it significantly increased the day after the manipulation in treated males and returned to baseline levels four days post-treatment, while no treatment effect was apparent in females. Although there was no overall difference in survival between the treatment groups, high initial (pre-treatment) IGF-1 and low post-treatment plasma malondialdehyde levels were associated with enhanced survival prospects in males. These results suggest that males may be more susceptible to IGF-1-induced oxidative stress than females and quickly restoring oxidative balance may be related to fitness. IGF-1 levels evolve under opposing selection forces, and natural variation in this hormone's level may reflect the outcome of individual optimization.","PeriodicalId":19473,"journal":{"name":"Oecologia","volume":" ","pages":"561-570"},"PeriodicalIF":2.3,"publicationDate":"2024-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11358184/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141627266","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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}

引用次数: 0

Does host migration affect host-parasite interaction? Migrant birds harbor exclusive parasites but have similar roles in parasite-host networks. 宿主迁移会影响宿主与寄生虫之间的相互作用吗？迁徙鸟类携带的寄生虫各不相同，但在寄生虫-宿主网络中的作用却相似。

IF 2.3 2区环境科学与生态学

Oecologia Pub Date : 2024-08-01 Epub Date: 2024-08-05 DOI: 10.1007/s00442-024-05603-1

Daniela de Angeli Dutra, Raquel Andrade Rodrigues, Mauro Pichorim, Patrícia de Abreu Moreira, Érika Martins Braga

{"title":"Does host migration affect host-parasite interaction? Migrant birds harbor exclusive parasites but have similar roles in parasite-host networks.","authors":"Daniela de Angeli Dutra, Raquel Andrade Rodrigues, Mauro Pichorim, Patrícia de Abreu Moreira, Érika Martins Braga","doi":"10.1007/s00442-024-05603-1","DOIUrl":"10.1007/s00442-024-05603-1","url":null,"abstract":"Parasites comprise a substantial portion of global biodiversity and play critical roles in shaping ecosystems by modulating trophic networks and affecting their hosts' abundance and distribution. The dynamics of host migration introduce new complexity to these relationships. From the host perspective, migratory behavior can either act as a defense mechanism or augment exposure to a broader spectrum of pathogens. Conversely, for parasites, host migration represents a mechanism for their dispersion and an opportunity to infect new host species. This study investigates the complex interplay between migration and parasite-host interactions, focusing on the interaction between hosts and avian malaria and malaria-like parasites in the Brazilian Atlantic Rain Forest. We captured 1466 birds representing 70 different species, uncovering 322 infections with Plasmodium/Haemoproteus parasites. We observed variations in migration timing and fluctuations in host abundance across months. By comparing the observed patterns of interaction of migratory and non-migratory birds to patterns of interaction expected at random, we show that migration affects the roles hosts take in the parasite-host network. Interestingly, despite the fact migratory species hosted more exclusive and distinct parasites, migrants did not occupy central network positions, which are mostly occupied by resident birds. Overall, we highlight the role of resident birds as a key species within parasite-host communities and the high specialization among avian haemosporidians and their hosts.","PeriodicalId":19473,"journal":{"name":"Oecologia","volume":" ","pages":"681-689"},"PeriodicalIF":2.3,"publicationDate":"2024-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141889810","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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}

引用次数: 0