Low Disturbance Research Articles

Assessing the Solar Activity and Geomagnetic Disturbance during Minimum Phase of Solar Cycle 24 across the Globe.

Understanding solar activity and its implications on the Earth’s environment has become necessary. Most importantly, events that characterized the minimum phase of solar cycle 24 (2019) and geomagnetic disturbance experienced during this period calls for an assessment. To assess this, the study has therefore used INTERMAGNET data from geomagnetic stations across the globe during the solar minimum year of solar cycle 24. A total of nine geomagnetic stations data of five disturbed days in a month were used, and were averaged in a minute interval for year 2019. The stations were selected with reference to their geomagnetic locations (latitudes and longitudes) as well as analyzing their horizontal magnetic field (H-Component) from the X and Y component of the geomagnetic field to reveal the variance in the global pattern of solar variations. The seasonal variations were studied across various latitudes and longitudes to understand the impact of solar activities on the earth surface as a result of geomagnetic field disturbance on Earth’s magnetosphere at the end of cycle 24 (2019). The results of stations revealed ABK and DRV with 350nT and 150nT of H component respectively which are the highest while other stations have 60nT below. This study shows that low geomagnetic disturbance was witnessed during the end of the cycle due to the minimum solar activity which was as a result of low number of sunspot during this period.

Biomorphological traits and leaf dry matter content are important to plant persistence in a highly unstable volcanic ground

The colonisation of newly formed territories by plants during primary succession is a crucial stage in the formation of ecosystems. Adaptations of species to withstand harsh environment allow them to survive and form pioneer communities. We analysed ten categorical and quantitative plant traits to examine their role in plant resistance to substrate instability in primary volcanic habitats. The research questions were: 1) which plant traits enable plants to persist under the most unstable ground conditions?; 2) what are the ecological strategies of species that grow under the condition of stress, such as low mineral nutrition, coupled with intense disturbance, such as unstable ground? The research was conducted on the Tolbachinsky Dol plateau in Kamchatka, Russia, on loose volcanic sediments of the 1975 eruption. At altitudes ranging from 700 m a.s.l. to 1000 m a.s.l., 40 sample plots were established along the gradients of altitude and degrees of ground instability. The species composition of vascular plants and the percentage cover of species, as well as other habitat characteristics, were assessed. Linear models were used to investigate the relationship between traits and ground instability. The principal component analysis was used to identify groups of characteristic traits. Leaf dry matter content (LDMC) had the largest explained variance. The LDMC community weighted means decreased with increasing disturbance (ground instability). A whole set of categorical traits, i.e. plant functional types, characterised the adaptation of plants to unstable ground. These characteristics include life-form (according to Serebryakov classification), density of shoots arrangement, morphology of underground organs, and, to a lesser extent, dispersal mode. The study analysed 45 species, and it was found that only four of them were adapted to perform under conditions of high substrate instability. The study showed that the mutual interaction of a suite of biomorphological traits and leaf density characteristics formed a syndrome of pioneer species adapted to unstable ground. The ecological strategies of the majority of species in the studied communities were characterised by the predominance of the stress-tolerant strategy, explained by the extremely poor mineral nutrition in the primary habitats. Under conditions of both low nutrient availability and high disturbance intensity, species with a mixed stress-tolerant-ruderal strategy are favoured. In the gradient of increasing disturbance, the role of the ruderal axis increased while stress tolerance decreased. However, the role of ecological strategy may be weakened by the presence of other important adaptive traits.

Эколого-экономическая оценка эффективности технико-технологических решений для ресурсосберегающих технологий возделывания зерновых культур в Сибири

The article analyzes and evaluates the effectiveness of grain cultivation in Siberia. The high energy intensity and poor execution of technological processes leading to their low efficiency and disturbance of the ecological balance have been revealed. It is necessary to improve the methodological approach and develop new mathematical models for the ecological and economic assessment of technological and technical solutions that reduce energy intensity as the main indicator with the predominant use of extensive technologies and reduce the anthropogenic load on the soil. Methodological and technical and technological solutions are proposed to assess the anthropogenic impact on the environment and reduce material costs in resource-saving technologies for the cultivation of grain crops in Siberia. The main economic indicators of the efficiency of cultivation of agricultural land are considered. The conditions of yield growth as a random variable and the main indicator of agricultural efficiency are shown. The rational structure of the three levels of technology intensity recommended for the conditions of the SFO is determined, and the model of mathematical expectation of full expenditures is substantiated. The functions of useful work and time losses are determined; the ration structure of technological processes of basic tillage is proposed. The prospects of using flexible tillage complexes are considered. For each specific case, an algorithm for the ecological and economic assessment of technological and technical solutions is proposed, taking into account the main economic indicators, including energy supply and the quality of the technological processes performed. To reduce energy intensity and improve the environmental situation, a rational structure of recommended levels of technology intensity for the conditions of the Siberian Federal District with an appropriate set of technical support for basic tillage processes is proposed.

Incidence of Violence and Sexual Dysfunction among Infertile Women Attending Women's Health Hospital, Assiut University

In the present day, people view infertility as a social issue that can result in psychological instability, relationship problems, and divorce. Consequences of infertility, such as low self-esteem, anxiety, and sexual relationship disturbances associated with failure in reproduction, have a major impact on sexual satisfaction. Aim:This study aims to assess the incidence of violence and sexual dysfunction among infertile women. Methods:Apurposive sample of 60 infertile women was enrolled; a cohort design was used. The outpatient gynecological clinic and ARTunit at Women's Health Hospital, Assiut University served as the study's sites. Data collection tools include a structured interview questionnaire, the Arabic version of the female sexual dysfunction index, and the WHO women domestic violence scale. Results:The study findings illustrate that the majority (85%) of infertile women experience violence, and a vast majority (93.3%) of them have sexual dysfunction. a highly statistically significant relationship between exposure to violence and occupation (p= 0.004) as well as type of family (p=0.001). Another highly statistically significant relationship exists between sexual dysfunction and occupation (p=0.004), in addition to educational level (p=0.009). Conclusion:Various forms of intimate partner violence and sexual dysfunction afflict infertile women. So, nurses should consider routine screening for domestic violence victims in infertility clinics. Recommendation:Providing marital counseling as a general course in higher institutions of learning to prepare couples to have positive sexual behaviour.

Sleep Disturbance among Chronic Low Back Patients: A Short Survey

Introduction: In the realm of modern health challenges, Chronic Low Back Pain (CLBP) and sleep disturbances is an issue of concern, casting a shadow over millions worldwide CLBP has a direct impact on the sleep disturbance leading to physical and mental disabilities. Physiotherapy is pivotal in management of Primary and secondary complications like sleep disturbances associated with CLBP. Aim: To evaluate and analyse various domains of sleep hygiene among CLBP patients through Pittsburgh Sleep Quality Index (PSQI). Materials and Methods: A survey using the gold standard method was conducted in the Department of Physiotherapy, Maharishi Markandeshwar Institute of Physiotherapy and Rehabilitation, Maharishi Markandeshwar (Deemed to be University), Mullana, Ambala, Haryana, India, among 8 patients with CLBP and the sleep was evaluated through PSQI which serves as a seven component subjective questionnaire that evaluated the state of sleep and interruptions during a one-month period. Results: Data analysis showed that PSQI has significant improvements (p<0.05) after manual and conventional physiotherapy. Conclusion: Physiotherapy plays a crucial role in management of chronic low back pain and secondary complications such as sleep disturbance associated with it. Using both manual and conventional physiotherapy techniques greatly improves the outcome of treating CLBP.

Laboratory simulation of natural gas hydrate formation and low disturbance drilling

Obtaining real natural gas hydrate pressure-retaining samples is challenging, necessitating the study of in-situ condition preserved coring (ICP-Coring) technology. In this paper, we simulated the in-situ formation of natural gas hydrate using a high pressure cooling method within a self-developed formation environment simulation chamber. Drilling experiments were conducted to examine the influence of drilling parameters on low disturbance drilling processes. Our findings indicate that the feed rate of the drill pipe primarily affects the force magnitude on the drill pipe, while the rotational speed of the drill pipe significantly impacts the stability of this force, with slightly higher rotational speeds resulting in less disturbance.

NILE CROCODILE NESTING ECOLOGY UNDER VARYING HUMAN DISTURBANCE INTENSITIES ALONG LOWER RIVER TANA, KENYA

The Nile crocodile (Crocodylus niloticus, Laurenti, 1768) supports important ecological and socio-economic functions; however, its survival in most of its ranges in Africa continues to be threatened by anthropogenic activities. Here, we compared selected attributes of Nile crocodile nests (abundance, clutch size, distance from water, and presence or absence of eggs, tending and predation) across three human disturbance regimes (low, intermediate and high), indexed by coverage of cropland and settlement, along lower River Tana, Kenya. We conducted a crocodile nest survey in January 2019 and overlaid the resultant data on the most recent land cover map of a 1-km wide strip on both sides of the river, segmented into the different disturbance regimes using remote sensing and geographical information system techniques. The low, intermediate and high disturbance regimes comprised combined cropland and settlement coverage of 2%, 9% and 15%, respectively, and covered 28%, 27% and 47% of the surveyed river segment. We counted a total of 99 nests, with 45, 34 and 20 nests located in low, intermediate and high disturbance regimes, respectively. Nests were 56% less frequent than expected under high disturbance, whereas they were 69% more frequent than expected under low disturbance and showed expected frequency under intermediate disturbance. In addition, nests were 56% and 41% less frequent under high disturbance compared to low and intermediate disturbance, respectively. However, nest abundance was statistically similar between the latter two regimes. No significant differences were observed in other assessed attributes across disturbance regimes. Our study underscores the importance of minimizing land conversion in such human-dominated landscapes for enhanced sustainable utilization and conservation of crocodiles.

Coexistence mechanisms of small carnivores in a near-pristine area within the mountains of Southwest China

Biodiversity is a vital aspect of an ecosystem and investigating its formation and maintenance is vital. Maintaining biodiversity notably requires a clear understanding of the mechanisms underlying species coexistence. However, in the Anthropocene, the absence of large carnivores in most areas has reduced the number of relatively intact ecosystems suitable for coexistence research. The mountains of Southwest China, a biodiversity hotspot with relatively low anthropogenic disturbance, offer a potentially suitable area for studying carnivore coexistence, especially in the Xinlong region in Sichuan. To understand the mechanisms underlying the coexistence of small carnivores, we used infrared cameras to investigate their spatiotemporal activity. We explored interspecific niche differentiation and small carnivore' responses to top predators and human disturbances using occupancy modeling and avoidance-attraction ratios (AARs). The results were as follows: (1) different small carnivores exhibited unique spatial and temporal responses to top predators, with leopard cats (Prionailurus bengalensis) preferring to occupy areas occupied by leopards (Panthera pardus), whereas yellow-throated martens (Martes flavigula) and red foxes (Vulpes vulpes) remained spatially independent of leopards; (2) human activities did not significantly affect the spatial activities of small carnivores, but small carnivores exhibited time-resistant behavior toward humans and domestic cattle; and (3) we observed temporal and spatial avoidance between leopard cats and other small carnivores (yellow-throated martens and red foxes). Overall, our study highlights the complex and unexpected behavioral responses and survival strategies of animals within an integrated community. In the future, we aim to further investigate the mechanisms underlying the formation of wildlife communities in this region and to elucidate the potential roles of human activities within this ecological community.

A hybrid domain-based watermarking for vector maps utilizing a complementary advantage of discrete fourier transform and singular value decomposition

Digital watermarking plays a crucial role in the copyright protecting of vector maps. Due to its solid theoretical foundation, Discrete Fourier transform (DFT) is frequently used in the construction of watermarking scheme for diverse electronic data. However, when applied to vector maps, DFT is particularly vulnerable to local changes in coordinate points, posing challenges in surviving coordinate point attacks and limiting its practicality. Furthermore, its resistance against geometric attacks is quite weak. To address these issues, we propose an algorithmic complementary strategy that enhances the performance of DFT-based vector map watermarking scheme. The proposed scheme is founded upon a hybrid transform domain consisting of DFT and singular value decomposition (SVD). The first step is to extract feature points using the Douglas Peucker algorithm, with the distance threshold set to a relative value to ensure synchronization of feature points throughout scaling. The feature points are then subjected to DFT to obtain magnitude coefficients, which are then further transformed using SVD. By combining the geometric invariance of magnitude coefficients with the singular vectors of SVD, an invariant with rotation, scaling, and translation invariance can be generated. For watermark embedding, the invariant serves as an embedding domain and are multiplied to minimize the impact on the host vector maps. The experimental results reveal that the proposed vector map watermarking has very low disturbance, substantially lower than the comparing algorithms, deriving in excellent invisibility. The scheme can extract watermark images with a normalized correlation value of 1 under a variety of attacks, including rotation, scaling, translation, vertex addition, simplification, and map cropping, and it can even extract identifiable copyright information under a 10% vertex deletion, demonstrating very comprehensive robustness.

Highly Efficient Storage of 25-Dimensional Photonic Qudit in a Cold-Atom-Based Quantum Memory.

Building an efficient quantum memory in high-dimensional Hilbert spaces is one of the fundamental requirements for establishing high-dimensional quantum repeaters, where it offers many advantages over two-dimensional quantum systems, such as a larger information capacity and enhanced noise resilience. To date, it remains a challenge to develop an efficient high-dimensional quantum memory. Here, we experimentally realize a quantum memory that is operational in Hilbert spaces of up to 25 dimensions with a storage efficiency of close to 60% and a fidelity of 84.2±0.6%. The proposed approach exploits the spatial-mode-independent interaction between atoms and photons which are encoded in transverse-size-invariant vortex modes. In particular, our memory features uniform storage efficiency and low crosstalk disturbance for 25 individual spatial modes of photons, thus allowing the storing of qudit states programmed from 25 eigenstates within the high-dimensional Hilbert spaces. These results have great prospects for the implementation of long-distance high-dimensional quantum networks and quantum information processing.

Composition and Diversity of Bird Community in the Chemoga Wetland and the Associated Human-Modified Landscapes, East Gojjam, Ethiopia

Wetlands and their surrounding habitats are rich in avian communities. However, the desire for human needs has degraded these ecosystems. The current study was carried out in the Chemoga wetland and its associated human-modified landscapes in East Gojjam, Ethiopia, during both the dry and wet seasons from December 2020 to August 2021. The study aims to investigate the species composition and diversity of the bird community. A line transect sampling technique was used in the human-modified landscapes, whereas the total counting method was used to study the wetland habitat. PAST software and Microsoft Excel were used for data analysis. Using a paired diversity T-test, the effect of seasons and habitats on species richness and abundance was compared. In total, 3890 individuals, 76 species, 31 families, and 13 orders were recorded from the studied habitats. Our results showed that the Chemoga wetland with low human disturbance had a greater number of birds and abundance than the human-modified habitats at P < 0.05. Moreover, in both wet and dry seasons, the Chemoga wetland ( P < 0.05) shows significant difference in the abundance of avian species. But, in the human-modified habitat, there is no significant difference in the abundance of avian species ( P > 0.05). The majority of birds scored frequent and common on the ordinal scale in both habitats and seasons. This study confirms that the studied habitats are important for the conservation of birds. Conservation measures are thus required to limit disturbances and foster species survival in the area.

Alternative fatigue–creep performance of rock‐backfill composite structure material in mine stopes under high static stress: Disturbed amplitude effect

AbstractThis work aims to investigate the dynamic stress amplitude on the mechanical responses of rock‐backfill composite structure material under alternative low‐cycle fatigue loading and creep loading tests. Results show that deformation, damage propagation, and failure pattern are all impacted by the stress amplitude, and volumetric deformation is the largest for a sample subjected to strong stress disturbance. The equivalent lifetime decreases with the increase of disturbed amplitude. A notable positive interaction between the fatigue damage and time‐dependent damage is found, and they promote each other. Additionally, a novel damage evolution model is proposed by the irreversible radial strain, and the model matches well with the testing data. Moreover, post‐test computed tomography imaging reveals that cracks at rock‐backfill interfaces are relatively easy to be stimulated under low stress disturbance, and it is suggested that tension‐splitting failure is more likely to occur within the surrounding rock, and shear failure seems to occur within the cemented tailings backfill for all the tested samples.

Technical advances in high-speed atomic force microscopy.

It has been 30years since the outset of developing high-speed atomic force microscopy (HS-AFM), and 15years have passed since its establishment in 2008. This advanced microscopy is capable of directly visualizing individual biological macromolecules in dynamic action and has been widely used to answer important questions that are inaccessible by other approaches. The number of publications on the bioapplications of HS-AFM has rapidly increased in recent years and has already exceeded 350. Although less visible than these biological studies, efforts have been made for further technical developments aimed at enhancing the fundamental performance of HS-AFM, such as imaging speed, low sample disturbance, and scan size, as well as expanding its functionalities, such as correlative microscopy, temperature control, buffer exchange, and sample manipulations. These techniques can expand the range of HS-AFM applications. After summarizing the key technologies underlying HS-AFM, this article focuses on recent technical advances and discusses next-generation HS-AFM.

Numerical simulation of laminar-turbulent transition in a supersonic boundary layer under the action of acoustic disturbances

In low disturbance environment, laminar-turbulent transition (LTT) is associated with excitation of unstable normal modes of small initial amplitudes (receptivity problem). These modes grow exponentially to a critical amplitude in accord with the linear stability theory (LST) and trigger the nonlinear breakdown. In the current study numerical simulation of laminar-turbulent transition (LTT) in the boundary layer on the upper surface of a flat plate in a supersonic free stream of Mach number M∞=3 and Reynolds number Re∞=2 × 107 is carried out. The flow is perturbed by fast or slow acoustic waves of low intensity, which excite unstable waves of the first mode. The latter have frequencies corresponding to the integral amplification N ≈ 9.16 typical for flight conditions. Two cases are considered: the angle of attack AoA=0° at which acoustic waves pass through a weak shock induced by viscous-inviscid interaction; AoA=5° at which acoustic waves pass through the expansion fan emanating from the plate leading edge. A holistic modeling of all stages of the transition from receptivity to the birth of turbulent spots is performed using direct numerical simulations. Linear stability theory is used to interpret the results. Feasibility of practical implementation of the amplitude method for predictions of the LTT onset in the considered and similar cases is discussed. It has been shown that to realize the amplitude method in the considered and similar cases, it is sufficient: to calculate the initial amplitudes of instability in a small vicinity of the leading edge and the propagation of instability from the leading edge to the station where the instability reaches the critical amplitude u′max≈4%. Analysis of known numerical and experimental data showed that this criterion weakly depends on the local Mach number in the range 0<Me<7, and it is acceptable for practical predictions of the transition onset points.

A novel fuzzy extended state observer-based control for electro-optical tracking system with disturbances and measurement noises: Design, analysis and experiments

In the electro-optical tracking system (ETS), the stability of line-of-sight (LOS) is usually limited by low and medium-frequency disturbances and measurement noises. Conventionally, the active disturbance rejection control (ADRC) strategy is an effective method to improve the stability of LOS; however, it is limited by the fixed observer bandwidth, which is the parameter of the extended state observer (ESO). Besides that, for conventional ESO, the conflict exists between disturbance rejection ability and noise attenuation ability. In this paper, this problem is tackled by transforming the ESO which is the core element of ADRC, into a novel fuzzy self-tuning observer structure. The proposed method is experimentally validated to effectively ensure the stability of the LOS after obtaining an optimal trade-off between disturbance rejection ability and noise attenuation ability.

Effect of unsteady supersonic flow on detonation under different hot jet initiation conditions

To understand the actual operation of detonation engines, it is of great significance to simulate the detonation characteristics after being affected by unsteady supersonic flow. Adaptive mesh refinement method and single-step chemical reaction model were used for simulation calculations. The Navier–Stokes equations and hybrid sixth-order weighted essentially non-oscillatory centered difference scheme was adopted in this study. Three different amplitudes of disturbances (0.1, 0.2, and 0.3) and two hot jet injection times were analyzed. The results showed that a moderate disturbance can improve the stability of detonation wave under the ideal hot jet injection time. It allows detonation wave to stay in the combustion chamber for a longer time, which is beneficial for the release of thrust performance. Although the stability of detonation wave is significantly different between the low and high-amplitude disturbances, the residence time of detonation wave is close to the steady flow case under ideal initiation conditions. When the ignition time is insufficient, successful detonation can occur with low and medium-amplitude disturbances. However, the ignition delay was significantly prolonged with medium-amplitude disturbance. There was also greater instability, which is detrimental to the thrust release. When the inflow has a high-amplitude disturbance, the detonation wave fails to ignite due to insufficient energy.

Species preference for seagrass restoration using vertical distribution model in Tidung Island, Indonesia

Tidung Island is one of the small inhabited islands and a tourist destination that allows the degradation of seagrass meadow and requires physical restoration using transplantation techniques. The seagrass species’ preference suitability needs to assess with this island for this case. This study aims to provide information on species that are possible to choose in seagrass transplantation based on their growth zones. The number of seagrass species, depths, and types of substrates was taken using seagrasswatch guideline by line transects along the coast to the reef slope with 10% plot intervals from the total length of the transect. Seagrass growth is divided into three zones: near the coast (back), middle, and near the reef slope (front). Enhalus acoroides, Cymodocea rotundata, and Thalassia hemprichii were found in almost all zones. Halophila ovalis, Halophila minor, and Halodule uninervis were distributed in the middle to front zone, while Syringodium isoetifolium was only in the middle zone. These findings suggest that transplant areas with high anthropogenic disturbances can use Enhalus acoroides and Thalassia hemprichii because they have the persistent trait. Meanwhile, the areas with low anthropogenic disturbance and low nutrients can use Halophila spp. and Halodule spp., because they can grow shoots and recover quickly.

Seasonal variations in the diversity and benthic community structure of subtidal artificial oyster reefs adjacent to the Luanhe River Estuary, Bohai Sea

Artificial oyster reefs provide important spawning and nursery grounds for a variety of fishes and large mobile crustaceans. Between July 2016 and May 2017, seasonal surveys of species composition and community structure were performed in the artificial oyster reef area and control area adjacent to the Luanhe River Estuary in China. During the survey year, 56 species belonging to 50 genera, 45 families, and 19 orders were recorded. The dominant economically important fish and mobile crustaceans were Hexagrammos otakii, Pholis fangi, Sebastes schlegelii, Charybdis japonica, and Oratosquilla oratoria. Resident fishes belonged to the Cynoglossidae, Paralichthyidae, Pleuronectidae, and Gobiidae families. Seasonally important fish species included Lateolabrax japonicus, Konosirus punctatus, Thryssa kammalensis, Hexagrammos agrammus, and Acanthopagrus schlegelii. The ranges of H' values among stations were 1.18–2.16, 0.65–1.75, 1.18–2.06, and 0.62–1.92 in spring, summer, autumn, and winter, respectively. The benthic organisms present in the community of artificial oyster reef areas can be classified into groups according to month and season. The abundance biomass curves showed that the oyster reef area in spring, autumn, and winter experienced low disturbance, whereas the community structure in summer was subject to large variations from external disturbance. We also found that as the age of the oyster reefs increased, the percentage of oysters in the low shell height group (< 40 mm) decreased. The oyster density was 324 ind/m2 for the reef created in 2016, 724 ind/m2 for the reef created in 2015, and 364 ind/m2 for the reef created in 2013. These findings can be used to develop suitable management strategies for the sustainable maintenance of artificial oyster reef ecosystems.

Effects of environmental factors on the river water quality on the Tibetan Plateau: a case study of the Xoirong River, China.

Climate, topography, and landscape patterns affect river water quality through processes that influence non-point source pollution. However, little is known about the response of the water quality of rivers on China's Tibetan Plateau to these environmental factors. Based on the water quality parameters data of the Xoirong River on the Tibetan Plateau in western China, the redundancy analysis and variation partitioning analysis were adopted to determine the main influencing factors affecting river water quality and their spatial scale effects. The major water pollutants were further analyzed using the partial least square-structural equation modeling (PLS-SEM). Another mountainous river with a similar latitude, the same stream order, and low anthropogenic disturbance in central China, the Jinshui River, was also selected for comparative discussion. The results indicated that the overall river water quality on the Tibetan Plateau was superior to that of the Jinshui River. At the catchment scale, the cumulative explanatory powers of the influencing factors of both rivers were greatest. Landscape composition and configuration were the determinant factors for the overall water quality of the two rivers, while the river on the Tibetan Plateau was also significantly affected by climatic and topographical factors. Regarding the main water quality issue, i.e., total nitrogen, agricultural production activities might be the main cause of the river on the Tibetan Plateau. This study unveiled that the river water quality on the Tibetan Plateau is sensitive to climate and topography through comparative studies.

Trophic interactions between two sympatric mesocarnivores in an anthropized landscape from the Mexican highlands

The study of diets in North American carnivores has been assessed from different methods, essentially analyzing the composition of their diet, and classifying the species based on the breadth of their trophic niche. Still, studies that explore aspects of their interactions are limited. This work studies the predator-prey relationship through an interaction network analysis approach, nesting, and the analysis of core vs peripheral individuals, for two sympatric species of the Mexican highlands, the bobcat (Lynx rufus) and the coyote (Canis latrans). In addition, the effect on the structure of the interaction networks under two conditions of environmental disturbance was evaluated. In environments with high disturbance: A network was obtained for 46 bobcats and 18 coyotes, identifying six bobcats and five core coyotes; and in environments with low disturbance, the network was obtained for 134 bobcats and 38 coyotes, identifying 30 bobcats and eight core coyotes. Three of the analyzed networks presented a nested pattern with the WNOFD metric (High disturbance: L. rufus: Nesting = 0.51, p < 0.05, C. latrans: 4.13, p < 0.05; Low disturbance: L. rufus, 0.91, p < 0.05) and only one network with the NOFD metric was nested (Low disturbance = C. latrans, 19.51, p < 0.05). There was an effect of environmental disturbance on the evaluated networks; in highly disturbed environments, the structure and composition of the interactions are different for both species. Unlike conventional methods for studying the diet of carnivores, our results provide a different methodology that allows characterizing the network of trophic relationships between predators and their prey, evaluating whether their relationships are nested, and analyzing information at the level of individuals and sexes. In subsequent studies, it is relevant to investigate the fragility of the network due to the loss of essential components of its structure, which will allow establishing measures for its conservation. Also, presents for the first time the structure of the trophic interaction network for two sympatric mesocarnivores from the Mexican highlands, as a tool to study their relationships and show mechanisms of their coexistence.