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Nitrogen Dynamics and Use Efficiency in Pasture-Based Grazing Systems: A Synthesis of Ecological and Ruminant Nutrition Perspectives
Bashiri Iddy Muzzo*
Posted: 03 December 2025
Venice’s Hidden Time Capsule: Lazzaretto Vecchio as a 300-Year Molecular Archive of Epidemic Pathogens
Andrea Vianello
,Robert H Tykot
,Swamy R Adapa
,Gloria C Ferreira
,Gregory O'Corry-Crowe
,Rays H.Y. Jiang
Posted: 03 December 2025
Memories of Eden?-The Fruit Tree Forest of Central Asia
Linda Susan Olsvig-Whittaker
Posted: 02 December 2025
African Grass Invasion Threatens Tropical Wetland Biodiversity: Experimental Evidence from Echinochloa pyramidalis Invasion in a Mexican Ramsar Site
Hugo López Rosas
,Patricia Moreno-Casasola
African grasses deliberately introduced for cattle forage have become among the most destructive invaders of tropical wetlands globally, yet invasion mechanisms and management strategies remain poorly understood. We conducted field experiments examining competition dynamics between the invasive African grass Echinochloa pyramidalis and native wetland species in La Mancha, Mexico—a Ramsar site of international importance. Experiment 1 tested invasion potential within native Sagittaria lancifolia zones using four treatments: control, herbicide removal, E. pyramidalis transplant, and combined removal + transplant. Repeated measures ANOVA showed significant treatment and time effects on invasion success, with vegetation removal facilitating invasion (relative importance value increasing from 0 to 149.4 ± 26.6 after 18 months) while transplants alone failed to establish (RIV < 7.0). Sagittaria maintained 35-48% biomass across treatments, demonstrating coexistence capacity. Experiment 2 examined natural invasion of the vegetation ecotone over 49 months. Mixed-effects models revealed that E. pyramidalis increased dominance in its zone (β = 9.98, z = 4.77, p < 0.001) but showed minimal expansion into adjacent Sagittaria habitat, indicating propagule limitation rather than competitive exclusion as the invasion constraint. Sagittaria removal within E. pyramidalis zones significantly reduced invasion temporal increase (β = -6.44, z = -2.18, p = 0.030), suggesting biotic resistance. Results demonstrate that E. pyramidalis possesses invasion potential but requires disturbance to overcome establishment barriers. These findings support prevention-based management prioritizing disturbance limitation in intact wetlands and demonstrate that hydrological management maintaining permanent flooding (>30 cm depth) can effectively control established invasions by exploiting C4 photosynthetic limitations. Conservation implications for Mexican coastal wetlands—which lack legal protection equivalent to mangroves despite comparable ecosystem services—are discussed. These findings inform evidence-based management of African grass invasions in tropical wetlands worldwide.
African grasses deliberately introduced for cattle forage have become among the most destructive invaders of tropical wetlands globally, yet invasion mechanisms and management strategies remain poorly understood. We conducted field experiments examining competition dynamics between the invasive African grass Echinochloa pyramidalis and native wetland species in La Mancha, Mexico—a Ramsar site of international importance. Experiment 1 tested invasion potential within native Sagittaria lancifolia zones using four treatments: control, herbicide removal, E. pyramidalis transplant, and combined removal + transplant. Repeated measures ANOVA showed significant treatment and time effects on invasion success, with vegetation removal facilitating invasion (relative importance value increasing from 0 to 149.4 ± 26.6 after 18 months) while transplants alone failed to establish (RIV < 7.0). Sagittaria maintained 35-48% biomass across treatments, demonstrating coexistence capacity. Experiment 2 examined natural invasion of the vegetation ecotone over 49 months. Mixed-effects models revealed that E. pyramidalis increased dominance in its zone (β = 9.98, z = 4.77, p < 0.001) but showed minimal expansion into adjacent Sagittaria habitat, indicating propagule limitation rather than competitive exclusion as the invasion constraint. Sagittaria removal within E. pyramidalis zones significantly reduced invasion temporal increase (β = -6.44, z = -2.18, p = 0.030), suggesting biotic resistance. Results demonstrate that E. pyramidalis possesses invasion potential but requires disturbance to overcome establishment barriers. These findings support prevention-based management prioritizing disturbance limitation in intact wetlands and demonstrate that hydrological management maintaining permanent flooding (>30 cm depth) can effectively control established invasions by exploiting C4 photosynthetic limitations. Conservation implications for Mexican coastal wetlands—which lack legal protection equivalent to mangroves despite comparable ecosystem services—are discussed. These findings inform evidence-based management of African grass invasions in tropical wetlands worldwide.
Posted: 02 December 2025
Ethological Insights into the Ecology and Movements of the Blacktip Reef Shark (Carcharhinus melanopterus) in an Undisturbed Reef Community
Ila France Porcher
,Brian W. Darvell
Posted: 28 November 2025
New Breeding Information on the Pinto’s Spinetail Synallaxis infuscata in the Atlantic Rainforest of Northeastern Brazil
Anita Studer
,Leïla Perroulaz
Posted: 28 November 2025
Three Cases Revealing Remarkable Genetic Similarity Between Vent-Endemic Rimicaris Shrimps Across Distant Geographic Regions: Toward a New Conservation Perspective
Won-Kyung Lee
,Soo-Yeon Cho
,Se-Jong Ju
,Se-Joo Kim
Deep-sea hydrothermal vent fauna is often regarded as highly endemic, although exceptions have been reported. We examined genetic connectivity across broad spatial scales within the alvinocaridid genus Rimicaris, which has undergone substantial adaptive radiation worldwide. We analyzed six Rimicaris species using three genetic markers (COI, 16S, and H3) and complete mitogenomes, using newly generated sequences combined with publicly available sequence data. Genetic tree and haplotype networks were constructed, and divergence analyses were performed. As a result, three clades of paired Rimicaris species were identified, each comprising taxa from different oceanic regions, but showing relatively low COI divergence (0.35–1.90%). In Clade I, Rimicaris chacei and Rimicaris hybisae are morphologically similar and exhibit bidirectional gene flow, suggesting a dispersal route between the Mid-Atlantic Ridge and Mid-Cayman Spreading Center. In Clade II, Rimicaris exoculata and Rimicaris kairei are morphologically, genetically, and ecologically distinct, reflecting restricted connectivity between the Mid-Atlantic Ridge and Carlsberg Ridge–Central Indian Ridge. In Clade III, Rimicaris variabilis and Rimicaris cf. variabilis differ in nutritional strategies, showing a unidirectional dispersal route from the northern Central Indian Ridge to the southwestern Pacific, but morphological data to distinguish them are currently lacking. Some Rimicaris lineages maintain connectivity across distinct oceanic regions while others still form unique regional populations. This finding highlights the need for conservation strategies that incorporate both global-scale connectivity and regional endemism, rather than treating vent ecosystems as a single homogeneous management unit.
Deep-sea hydrothermal vent fauna is often regarded as highly endemic, although exceptions have been reported. We examined genetic connectivity across broad spatial scales within the alvinocaridid genus Rimicaris, which has undergone substantial adaptive radiation worldwide. We analyzed six Rimicaris species using three genetic markers (COI, 16S, and H3) and complete mitogenomes, using newly generated sequences combined with publicly available sequence data. Genetic tree and haplotype networks were constructed, and divergence analyses were performed. As a result, three clades of paired Rimicaris species were identified, each comprising taxa from different oceanic regions, but showing relatively low COI divergence (0.35–1.90%). In Clade I, Rimicaris chacei and Rimicaris hybisae are morphologically similar and exhibit bidirectional gene flow, suggesting a dispersal route between the Mid-Atlantic Ridge and Mid-Cayman Spreading Center. In Clade II, Rimicaris exoculata and Rimicaris kairei are morphologically, genetically, and ecologically distinct, reflecting restricted connectivity between the Mid-Atlantic Ridge and Carlsberg Ridge–Central Indian Ridge. In Clade III, Rimicaris variabilis and Rimicaris cf. variabilis differ in nutritional strategies, showing a unidirectional dispersal route from the northern Central Indian Ridge to the southwestern Pacific, but morphological data to distinguish them are currently lacking. Some Rimicaris lineages maintain connectivity across distinct oceanic regions while others still form unique regional populations. This finding highlights the need for conservation strategies that incorporate both global-scale connectivity and regional endemism, rather than treating vent ecosystems as a single homogeneous management unit.
Posted: 28 November 2025
The Carbon-Based Evolutionary Theory: Extending Darwinian Theory to Unify Chemical, Biological, and Social Evolution
Ji-Ming Chen
,Ji-Wang Chen
Posted: 27 November 2025
Geographical Traceability of Anguilla japonica from Different Habitats Successfully Achieved Using Muscle Elemental Fingerprint Analysis
Chao Song
,Chengyao Yang
,Yijia Li
,Dongyu Song
,Xiaorong Huang
,Sikai Wang
,Feng Zhao
,Hong Tao
Posted: 26 November 2025
Endozoochory by Goats and White-Tailed Deer: Type of Ruminant Affect Recovery and Germination of Neltuma pallida Seeds
Jorge Salinas-Marcos
,Juancarlos Cruz-Luis
,Lucrecia Aguirre
The “algarrobo”, Neltuma pallida is a key tree species in the seasonally dry tropical forests in Equatorial Pacific South America, currently at risk. Its regeneration depends on endozoochorous seed dispersal, in which seeds are ingested and later defecated by animals, helping to release and scarify them. This study compared the role of the native white-tailed deer (Odocoileus virginianus) and the introduced goat (Capra hircus) in seed dispersal. Seeds were recovered from the dung of both species after experimental feeding and from free-ranging goats grazing in fruiting N. pallida forests. Seed recovery was higher in deer dung (9.4%) than in goat dung (3.1%). Retention time was also shorter in deer (peak at 48 hours) than in goats (peak at 84 hours). Only deer scarification significantly improved germination percentage (Tukey test, p < 0.001) and germination speed (T25 = 8.98 days). Goats reduced germination speed under experimental conditions (T25 = 19.25 days), but slightly improved it under forest conditions (T25 = 12.81 days). These differences are attributed to the morphophysiological traits of each species. Although goats did not enhance overall germination, they maintained it at ~44% and contributed to seed dispersal and dormancy release.
The “algarrobo”, Neltuma pallida is a key tree species in the seasonally dry tropical forests in Equatorial Pacific South America, currently at risk. Its regeneration depends on endozoochorous seed dispersal, in which seeds are ingested and later defecated by animals, helping to release and scarify them. This study compared the role of the native white-tailed deer (Odocoileus virginianus) and the introduced goat (Capra hircus) in seed dispersal. Seeds were recovered from the dung of both species after experimental feeding and from free-ranging goats grazing in fruiting N. pallida forests. Seed recovery was higher in deer dung (9.4%) than in goat dung (3.1%). Retention time was also shorter in deer (peak at 48 hours) than in goats (peak at 84 hours). Only deer scarification significantly improved germination percentage (Tukey test, p < 0.001) and germination speed (T25 = 8.98 days). Goats reduced germination speed under experimental conditions (T25 = 19.25 days), but slightly improved it under forest conditions (T25 = 12.81 days). These differences are attributed to the morphophysiological traits of each species. Although goats did not enhance overall germination, they maintained it at ~44% and contributed to seed dispersal and dormancy release.
Posted: 25 November 2025
Zoonotic Barrier Disruption and the Rise of the Third Plague Pandemic: A One Health Analysis of 19th-Century Yunnan and the Emergence of Yersinia Pestis Strain 1.ORI
Raymond Edward Ruhaak
,Victor Vasilyevich Suntsov
,Li Yang
The emergence of the Third Plague Pandemic in 19th-century Yunnan, linked to Yersinia pestis strain 1.ORI, remains incompletely understood. Applying a One Health framework, this study investigates how human-driven ecological and societal disruptions during the 19th century compromised zoonotic barriers, facilitating initial spillover and a bottleneck event that enabled global spread. Our interdisciplinary methodology analyzes Qing dynasty gazetteers, historical medical records, and environmental data, integrated with biological evidence on transmission dynamics involving commensal rats and the flea vector Xenopsylla cheopis. Results indicate that convergent factors—including widespread deforestation, intensified mining/agriculture, population growth, high synanthropic rat densities, and the disruptions of the Panthay Rebellion—collectively created a high-risk interface for zoonotic transfer. Critically, comorbidities such as malnutrition, heavy metal exposure, and opium use likely eroded host immune resilience in both rodent and human populations, amplifying transmission. Yunnan’s rapid socio-ecological transformation was thus a critical catalyst for pandemic emergence. This analysis underscores how historical land-use, demographic shifts, and public health conditions shaped zoonotic risk. Crucially, a One Health assessment must analyze interactions across time and space, recognizing that environmental, biological, and socioeconomic changes occur on non-uniform temporal scales. This spatiotemporal perspective provides a framework that offers deeper insight into past pandemic origins and for anticipating contemporary vulnerabilities.
The emergence of the Third Plague Pandemic in 19th-century Yunnan, linked to Yersinia pestis strain 1.ORI, remains incompletely understood. Applying a One Health framework, this study investigates how human-driven ecological and societal disruptions during the 19th century compromised zoonotic barriers, facilitating initial spillover and a bottleneck event that enabled global spread. Our interdisciplinary methodology analyzes Qing dynasty gazetteers, historical medical records, and environmental data, integrated with biological evidence on transmission dynamics involving commensal rats and the flea vector Xenopsylla cheopis. Results indicate that convergent factors—including widespread deforestation, intensified mining/agriculture, population growth, high synanthropic rat densities, and the disruptions of the Panthay Rebellion—collectively created a high-risk interface for zoonotic transfer. Critically, comorbidities such as malnutrition, heavy metal exposure, and opium use likely eroded host immune resilience in both rodent and human populations, amplifying transmission. Yunnan’s rapid socio-ecological transformation was thus a critical catalyst for pandemic emergence. This analysis underscores how historical land-use, demographic shifts, and public health conditions shaped zoonotic risk. Crucially, a One Health assessment must analyze interactions across time and space, recognizing that environmental, biological, and socioeconomic changes occur on non-uniform temporal scales. This spatiotemporal perspective provides a framework that offers deeper insight into past pandemic origins and for anticipating contemporary vulnerabilities.
Posted: 24 November 2025
The Evolution of Large Organism Size: Disparate Physiologies Share a Foundation at the Smallest Physical Scales
Simon Pierce
Posted: 24 November 2025
Beta Diversity Analyses of Mammal Fauna in Ağrı Province Across Different Geographical Regions in Türkiye
Servet Ulutürk
Posted: 20 November 2025
Evolution of Insect Pollination Before Angiosperms and Lessons for Modern Ecosystems
Ilaria Negri
,Mario E. Toledo
Posted: 18 November 2025
Genome-Scale Phylogenetic Analyses Provide Insights of the Evolutionary History of Species Complexes in the Genus Fusarium
Shunsuke Nozawa
,Yosuke Seto
,Kyoko Watanabe
Posted: 18 November 2025
SEQUENTION and the Superorganism: A Timeless, Projection-Based Framework for Collective Animal Behavior
Henry Arellano
Posted: 17 November 2025
The Branching Process: A General Conceptual Framework for Addressing Current Ecological and Evolutionary Questions
Xuhua Xia
Posted: 17 November 2025
Linking Soil Nutrients and Non-Herbaceous Plant Communities with Bat Diversity in a Tropical Agricultural Landscape in Ecuador
Magaly I. Aulestia - Herrera
,Wilmer E. Pozo-Rivera
Posted: 12 November 2025
The Effects of Different Concentrations of Microplastics on the Physiology and Behavior of Sebastes schlegelii
Shimeng Wang
,Shengkai Lin
,Tao Tian
,Jiamin Yan
,Ziyi Han
,Xiaoming Yu
,Zhongxin Wu
Posted: 10 November 2025
Diversity of Sordariales Fungi: Identification of Seven New Species of Naviculisporaceae Through Morphological Analyses and Genome Sequencing
Narumon Tangthirasunun
,Valérie Gautier
,Christophe Lalanne
,Lucas Bonometti
,Sandrine Cros-Arteil
,Richard Hayes
,Sarah Calhoun
,Robert Riley
,Jasmyn Pangilinan
,Anna Lipzen
+5 authors
Posted: 06 November 2025
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