Increased Food Availability Research Articles

Comparative Study of Fatty Acid Composition of Muscles of Atlantic Cod (Gadus morhua Linnaeus, 1758) with Natural Diet and Feeding near Salmon Farms

Coastal aquaculture and local fisheries interact in shared marine environments, influencing each other synergistically and/or antagonistically. Salmon farming, notably with open-net sea cages along the Norwegian coast, attracts wild fish due to increased food availability from uneaten feed, but it also exposes wild fish to farm emissions like waste and toxic chemicals (de-lice treatments, antifouling and medical agents). The attraction behaviour of wild fish can impact fatty acid composition in fish tissues, influenced by the high terrestrial fat content in salmon aquafeed. We study how the Atlantic cod, aggregating around salmon farms in a subarctic fjord in Northern Norway, can be affected, potentially altering their natural diet and fatty acid profiles. Our study compares the muscle-tissue fatty acid compositions of cod caught near aquaculture facilities (impact) versus fish caught in neighbouring fjords (control), and we hypothesise decreased omega-3 fatty acids near farms. The analysis revealed no significant differences in the fatty acid concentrations or categories between the impacted and control fish, challenging our initial expectations. However, differences were found for C18:1(n9)t (elaidic acid), with a higher value in the impacted fish. These findings suggest that salmon farming’s influence on cod’s fatty acid profiles in the flesh (i.e., relevant for the nutritional quality of the fillets that consumers eat) may be limited or minimal despite their aggregative behaviours around farms. The threshold levels of salmon feed consumed by wild cod before it affects the quality and survival of, e.g., sperm or other life stages, are not known and require new investigations. This study underscores the complexity of interactions between aquaculture and wild fisheries, impacting both ecological dynamics and consumer perspectives on seafood quality and health benefits.

Migratory lifestyle carries no added overall energy cost in a partial migratory songbird.

Seasonal bird migration may provide energy benefits associated with moving to areas with less physiologically challenging climates or increased food availability, but migratory movements themselves may carry high costs. However, time-dynamic energy profiles of free-living migrants-especially small-bodied songbirds-are challenging to measure. Here we quantify energy output and thermoregulatory costs in partially migratory common blackbirds using implanted heart rate and temperature loggers paired with automated radio telemetry and energetic modelling. Our results show that blackbirds save considerable energy in preparation for migration by decreasing heart rate and body temperature 28 days before departure, potentially dwarfing the energy costs of migratory flights. Yet, in warmer wintering areas, migrants do not appear to decrease total daily energy expenditure despite a substantially reduced cost of thermoregulation. These findings indicate differential metabolic programmes across different wintering strategies despite equivalent overall energy expenditure, suggesting that the maintenance of migration is associated with differences in energy allocation rather than with total energy expenditure.

Wildfire influences species assemblage and habitat utilisation of boreal wildlife after more than a decade in northern Sweden

Fires can strongly change the vegetation structure and the availability of resources for wildlife, but fire suppression has long affected the natural role of fire in shaping boreal ecosystems in northern Europe. Recently, wildfires have increased in frequency, possibly due to global warming. In contrast to the boreal systems in North America, there have been few studies on responses of wildlife to wildfires in northern Europe. Based on the findings from North America, we predict that responses of wildlife to wildfire vary among wildlife species: where mammalian herbivores, such as moose Alces alces and mountain hare Lepus timidus, will be attracted to burnt areas following an increase in food availability, other species, such as reindeer Rangifer tarandus, are negatively impacted due to fire reducing their preferred food. We then tested our predictions by contrasting wildlife utilization of sites that burnt by wildfire in 2006 with nearby unburnt control sites in three areas in northern Sweden. To measure wildlife utilization, we used 72 camera traps, equally divided between the burnt and control sites, with two placement strategies: random and on wildlife trails. The cameras recorded 27 mammal and bird species during summer 2018. Species assemblage differed between burnt and control sites. Fieldfare Turdus pilaris used burnt sites more than control sites, while pine marten Martes martes and western capercaillie Tetrao urogallus used control sites more than burnt sites. We however did not find support for a positive effect of past forest fires on any of the observed wild mammals. We discuss how, due to the impact of forestry, forage‐rich habitat may not be as limiting in Scandinavia as in the North‐American context, potentially leading to recently burnt sites being less attractive to herbivores such as moose.

Urban Agriculture’s ‘Invisible’ Short Food Value Chain: How Small-scale Farming Contributes to Johannesburg Food Security

AbstractUrbanisation into poverty in cities of the global South gives impetus to urban agriculture (UA) as a strategy to improve food security for low-income residents. This study disputes that UA is a trivial sector by arguing through the invisible short food value chain lens that it contributes to food security in local communities. The study adopted the extended case method that immersed researchers for more than a year to understand the practices of 11 farming entities and 20 of their customers in Johannesburg. Open-ended interview guides were administered to key informants from the city, provincial government, and non-governmental organisations. Findings show that UA increases food availability in local communities through the short food value chain. However, the local economy is undocumented and invisible to city stakeholders, negatively affecting their land use planning decisions for the sector. Though stakeholder consensus on UA is still lacking, the City of Johannesburg recognised UA’s potential and allocated both temporary and permanent land access arrangements for farming. Small-scale farmers lack the capacity to supply formal institutions, which can be overcome by intermediaries, such as civil society facilitation. The limitations of UA manifest in its inability to attract labour and keep records which inhibits its potential and support at the city level.

Assessing the Sustainability of Donated Livestock Projects by Operation Wealth Creation to Smallholder Farmers in Mitooma Sub-County Mitooma District

This research assessed the long-term sustainability of Operation Wealth Creation (OWC)'s donated livestock projects for smallholder farmers in Mitooma Sub-County, Uganda. The study uses a mixed-methods approach, incorporating quantitative surveys and qualitative interviews, with smallholder farmers selected through stratified random sampling. A study using structured questionnaires found that only 15% of households receiving donated livestock enterprises still own them, and 85% abandoned them within 9 years, indicating a lack of sustainability in these enterprises. The sustainability of donated livestock enterprises for small-scale farmers is influenced by family size, household income, food security, profitability, awareness of enterprise management practices, perception, culture, education, land tenure system, and age. Results also established that donated livestock enterprises significantly affected households to sell or trade the products (e.g., milk, meat, eggs) (P=0.000), households’ ability to cope with economic shocks or emergencies (P=0.001) and improving access to credit or financial services (P=0.013) and least significant in providing household income (P=0.668). Furthermore, results established donated livestock enterprise were less significant in increasing food availability (P=0.146), improving access to nutritious food, generating income for food purchase (P=0.913), facilitating asset accumulation for food security (P=0.116) and providing alternative coping mechanisms during periods of food scarcity (P=0.351). The study suggests that donated livestock enterprises are not sustainable, as many smallholder farmers abandon them within five years, and recommends enabling input suppliers and providing subsidies for farmers.

Maternal Behavior in Sumatran Orangutans (Pongo abelii) is Modulated by Mother-Offspring Characteristics and Socioecological Factors

AbstractMammalian mothers flexibly invest in their offspring to maximize their lifetime fitness. Flexible maternal investment may be particularly important in large-brained species with prolonged maternal care, e.g., in great apes. We investigated the effects of socioecological factors and mother–offspring characteristics on nine maternal behaviors in wild Sumatran orangutans (Pongo abelii; N = 22 mother-offspring pairs; >11,200 hr of focal data from 2007–2022) using generalized linear mixed models. The behaviors fall under four maternal functions: locomotory support (carrying), skill acquisition support (feeding in proximity, food transfer), protective proximity maintenance (body contact and proximity initiation, following), and independence promotion (body contact and proximity termination, avoiding). Mother’s parity was not significantly associated with any maternal behavior. Mothers were more likely to show locomotory support, skill acquisition support, and protective proximity maintenance toward younger than older offspring, whereas they were more likely to promote independence in older than younger offspring. Mothers with male offspring were more likely to show skill acquisition support to their offspring than those with female offspring. With increasing food availability, skill acquisition support reduced. With increasing association size (i.e., the number of individuals within 50 m of each other), mothers were more likely to show protective proximity maintenance and less likely to promote independence. When males were present, mothers were more likely to show locomotory support to their offspring. Sumatran orangutan mothers thus flexibly adjust offspring-directed behavior in response to prevailing socioecological factors and mother–offspring characteristics. Our findings add support to the evolutionary theory that mammalian mothers flexibly invest in their offspring.

Examination of the effects of excess microalgae availability on the disruption of mussel byssus secretion

The present study evaluated the effects of food availability on byssus secretion in the hard-shelled mussel Mytilus coruscus. Byssus production was evaluated, and foot tissue transcriptomes, the site of byssus production, were generated. The results showed that byssus secretion was disrupted in mussels fed high levels of microalgae (HFL, 88.8 mg/L day−1), compared to the control group (p < 0.05), and that more byssus production occurred in the HFL group during the recovery period. Byssus secretion was not affected in mussels fed low levels of microalgae (8.88 × 10−3 mg/L day−1), but the shedding of byssus filaments was significantly increased compared to the control mussels (p < 0.05). Transcriptome data of the foot tissue revealed that lysosome, FoxO signaling, and autophagy pathways involved in autophagic cell death and apoptosis were significantly affected (p < 0.05) and may explain differences in byssus growth under modified food availability in M. coruscus. High feed levels modified metabolic pathways, such as sphingolipid, tyrosine, and phenylalanine, and downregulated genes coding for mussel foot proteins, which may explain reduced byssus production. The study found that contrary to expectation increased food availability reduced mussel byssus production by altering foot metabolism and promoting autophagy of foot tissue.

Animal Detection based Smart Farming in Animal Repellent Using AI and Deep Learning

The combination of artificial intelligence (AI) and deep learning in agriculture has ushered in a new era in agriculture with new solutions designed to solve many problems. This paper presents an animal killing system for smart agriculture that uses artificial intelligence and deep learning to reduce the growing problem of animal damage. As the world population continues to grow, increasing food availability is important; Therefore, it is critical to protect crops from wild animals and pests. Deforestation due to livestock farming has become one of the largest human-wildlife conflicts due to human interference with habitats and deforestation. Wild animals can kill farmers working in the fields, causing major crop losses. Farmers suffered huge crop losses due to wild animals such as elephants, wild boars and deer attacking agriculture. Protecting crops from wild animals is one of the biggest concerns of today's farmers. There are many ways to solve this problem, both lethal (such as shooting and trapping) and non-lethal. (such as railings, pesticides, organic matter, netting or electric fencing). The sensor rotates around the lens and uses DCNN software to detect the target. If an animal is found, it sends a message to the Animal Repellent Module with information on the type of ultrasound that should be produced based on the animal. The development of drones with controlled flight control, as well as lightweight and powerful hyperspectral snapshot cameras that can be used to calculate crop biomass growth and fertilization status, responds to complex agricultural management strategies. KEYWORDS: Animal detection, VGG-Net, Bi-LSTM, convolutional neural network, activity recognition, video surveillance, wild animal monitoring, alert system.

Coping strategies of food insecure households with children and adolescents in Uruguay, a high-income Latin American country: A qualitative study through the lens of Bourdieu's theories of capitals and practice

Food insecurity has been associated with negative short, medium, and long-term health consequences, which are more detrimental for children and adolescents. These effects may depend on the coping strategies developed to deal with food shortages. The present research aimed at exploring coping strategies in food insecure households with children and adolescents in Uruguay, incorporating sociological theoretical insights from Bourdieu. A qualitative approach based on individual semi-structured interviews was used. A total of 40 interviews were conducted with adults who had parental responsibilities of children and adolescents and who received different types of food assistance, between July and December 2022, in four cities. Results showed that adults tend to develop a wide range of coping strategies aimed at: reducing food expenditure, increasing the availability of money for purchasing food, increasing food availability and/or rationing the food available in the household. Some of the strategies were implemented regardless of the severity of food insecurity, whereas others were characteristic of the moderate and severe levels of the construct. Evidence to support the mediation effect of coping strategies on health outcomes was found. Discourses suggested that lower accumulation of economic and cultural capital may be aligned with the adoption of less socially accepted mechanisms to access to food. Expressions of a specific habitus aimed at securing food were identified among participants with more deprivations. Taken together, the findings suggest that coping strategies may not be a universal or invariant sequence according to the severity of food insecurity and stress the importance of considering households’ resources and local context for the development of strategies to improve access to food.

The spatiotemporal properties of artificial feeding schemes influence the post-fledging movement of Egyptian Vultures

Abstract Many vulture populations have severely declined in the past decades, showing high juvenile mortality. To support these populations, feeding stations are used to increase food availability and to supply food without antibiotics and toxic compounds. Yet, supplying food at feeding stations may affect vulture behavior. We present a large-scale field experiment testing how different food provision schemes affected the movement of Egyptian Vultures (Neophron percnopterus). We used GPS transmitters harnessed to 18 vulture chicks and described their movements post-fledging. We categorized the vultures into 3 groups according to the feeding scheme used at feeding stations near their nests: frequent and spatially dispersed food supply (FD); non-frequent and spatially dispersed food supply (NFD); and frequent food supply, concentrated in one location (FC). We found that birds from all three groups increased their roosting distances from the nest with fledgling age, with the NFD and FC groups showing a greater increase than the FD group. Additionally, all 3 groups increased their daily flight distances, with the NFD group presenting the largest increase and the FD group presenting the smallest increase. Our findings offer new insights into the relevance of spatiotemporal differences in the management of feeding stations and show its effect on movement during birds’ early life stages, creating 2 main movement patterns: local and regional. Our findings can help decide upon the preferable feeding scheme in a way that will either encourage or reduce the early dispersal distances of fledglings, according to long- and short-term conservation objectives. For example, local movements during the post fledging period to known and stable food resources may reduce the risk of anthropogenic-induced mortality, while it may negatively affect long-term survival by hindering foraging, flight, and exploring skills and affect dispersion to future breeding sites.

Abundant resources can trigger reduced consumption: Unveiling the paradox of excessive scrounging

In ecological contexts, it is conventionally expected that increased food availability would boost consumption, particularly when animals prioritize maximizing their food intake. This paper challenges this conventional wisdom by conducting an in-depth game-theoretic analysis of a basic foraging model, in which animals must choose between intensive food searching as producers or moderate searching while relying on group members as scroungers. Our study reveals that, under certain circumstances, increasing food availability can amplify the inclination to scrounge to such an extent that it leads to a reduction in animals' food consumption compared to scenarios with limited food availability. We further illustrate a similar phenomenon in a model capturing free-riding dynamics among workers in a company. We demonstrate that, under certain reward mechanisms, enhancing workers' production capacities can inadvertently trigger a surge in free-riding behavior, leading to both diminished group productivity and reduced individual payoffs. Our findings provide intriguing insights into the complex relationships between individual and group performances, as well as the intricate mechanisms underlying the emergence of free-riding behavior in competitive environments.

Exploring the Effects of Cold Plasma on Preserving and Processing of Foods: A Review

In the current scenario, global food productions need to be incredibly enormous to feed everyone. Though food supply plays a tremendous role in reaching out to the people, meanwhile advancement in food processing technology is a predominant factor in increasing food availability. In the food industry, there was a huge number of technologies for food processing that made food more convenient to eat and might be stable for extended storage. Among the food processing technologies, cold plasma may be one of the novel non-thermal technology that functions at atmospheric pressure or low-pressure processing technology. Cold plasma is an eco-friendly technique involved in food preservation, mainly destructing microbes in food thereby extending its shelf life. Cold plasma processes the food without degrading the physical, chemical, biological, nutritional and sensory qualities of food products. This review elaborates on cold plasma utilization and its quality changes in various foods.

Understanding the Food Environment and Its Impact on Diet and Health in Asia: A Scoping Review.

Food environment (FE), an interface where people interact with a broader food system, is critical to health. Understanding the Asian FE may help to tackle the "triple burden of malnutrition" through informed research and policy. This review identifies FE domains assessed in the Asian context and collates the tools/measures used in these evaluations. We further synthesized the reported associations of FE with diet and health outcomes and identified knowledge gaps. Forty-two articles were reviewed (East Asia, n = 25, 60%; South Asia, n = 8, 19%; and Southeast Asia, n = 9, 21%). The results showed that FE was frequently examined in children, adolescents, or adults, but data were scarce in older adults. Food availability (n = 30) and accessibility (n = 19) were popularly studied domains. Furthermore, FE was measured using geographic information systems (n = 18), market (n = 7), or stakeholder (n = 21) surveys. Twenty-eight (67%) articles assessed associations of FE exposures with diet (n = 12) and health (n = 21). Increased food availability and accessibility were associated with poorer dietary and health outcomes despite nonexisting validity and reliability reporting in 62% of articles. Limited high-quality studies emphasize the need for harmonized definitions, better study designs, and validated FE measures/tools in Asia. Improving the quality of FE research is critical to designing effective interventions to improve public health nutrition in Asia.

Restoration of an Indigenous aquaculture system can increase reef fish density and fisheries harvest in Hawai‘i

AbstractWhile aquaculture is increasingly considered a globally important source of protein, growing fish for human consumption is not new. Indigenous aquaculture systems, such as loko i‘a (fishponds), were successfully implemented in ancient Hawai‘i and represent a technological advancement designed to sustain a growing human population while maintaining—instead of supplanting—natural ecosystem function in the process of increasing food availability. Biocultural restoration efforts in Hawai‘i, aimed at revitalizing Indigenous stewardship, have included restoration of loko i‘a to sustainably increase the availability of local seafood. While it is clear from historical accounts that loko i‘a can augment fish within estuaries, their role as a nursery ground that supplements surrounding fish populations and fisheries harvest (i.e., providing spillover) remains unstudied in the current literature. This study aimed to test the extent to which loko i‘a restoration can supplement fish populations and fisheries harvest both inside the loko i‘a and in the surrounding waters. A food web model was constructed representing nutrients, phytoplankton, fish, and fisheries in three distinct habitats. The model, set in Kāne‘ohe Bay, O‘ahu, Hawai‘i, revealed that there were interactive effects of the area under loko i‘a management, bay fishing effort, and fish dispersal rates on fish density and fisheries harvest. We found that increasing the area under loko i‘a management not only increased loko i‘a fish density and fisheries harvest but also created the potential to supplement bay fish populations and fisheries harvest under certain scenarios. We also identified a trade‐off whereby at high fish dispersal rates, a larger area under loko i‘a management provided maximal benefits to the bay fish population and fisheries harvest, while at low fish dispersal rates, a smaller area under loko i‘a management was more beneficial to bay fish populations and harvest. As expected, loko i‘a also created a surplus of fish within the pond. Our results support the idea that restoration of Indigenous aquaculture systems can positively impact conservation efforts and food security by increasing local fish availability, through both direct production and supplementation of surrounding fish stocks.

BENEFITS OF MANAGING FOOD LOSS AND WASTE FOR SUSTAINABLE RURAL DEVELOPMENT IN INDONESIA

The reduction of food loss and waste (FLW) has become a global priority under the Sustainable Development Goals (SDG). Reports from the United Nations and FAO reveal alarming statistics, with 13.3 percent of the world’s food lost post-harvest and 17 percent wasted at the consumer level. FLW is a problem found in both industrialized nations like the EU and emerging countries like Indonesia. While EU nations have committed to reducing per capita food waste by 2030, Indonesia has only begun addressing FLW. This paper explores the awareness and management of FLW in Indonesia, focusing on food recovery and redistribution strategies and their potential impact on rural sustainability development. It addresses FLW management through literature review with the aim of raising awareness to the urgency of FLW management and to support the circular economy in Indonesia. FLW is closely associated with consumer behaviour, and lessons from the EU suggests that supporting local farmers and improving the supply chain can help reduce FLW. The role of food recovery and redistribution in reducing FLW in Indonesia highlights the successful practices, emphasizing the transformation of „ugly food“ and the redistribution of excess edibles to combat FLW. Non-profit organizations in Indonesia have emerged to combat FLW by redistributing edible leftovers to those in need. Additionally, FLW recovery practices extend to agriculture, involving the reprocessing of unharvested agricultural products onto animal feed or organic fertilizers. These initiatives not only reduce waste, but also contribute to food security and poverty alleviation, especially in rural areas. The study concludes that addressing FLW in Indonesia can lead to increased food availability and sustainability. It recommends the development of national policies, programs, and partnerships to promote FLW management and the well-being of Indonesian communities. Further research is needed to identify specific challenges and opportunities for implementing food recovery and redistribution initiatives effectively. By taking concrete steps to reduce FLW, Indonesia can enhance food security and simultaneously align itself with the global sustainability agenda. Keywords: Food loss and waste (FLW), food recovery, redistribution, sustainable rural development JEL: O31, Q53, R11

Synergistic effect of nitrate exposure and heatwaves on the growth, and metabolic activity of microalgae, Chlamydomonas reinhardtii, and Pseudokirchneriella subcapitata

Aquatic biota are threatened by climate warming as well as other anthropogenic stressors such as eutrophication by phosphates and nitrate. However, it remains unclear how nitrate exposure can alter the resilience of microalgae to climate warming, particularly heatwaves. To get a better understanding of these processes, we investigated the effect of elevated temperature and nitrate pollution on growth, metabolites (sugar and protein), oxidative damage (lipid peroxidation), and antioxidant accumulation (polyphenols, proline) in Chlamydomonas reinhardtii and Pseudokirchneriella subcapitata. The experiment involved a 3 × 3 factorial design, where microalgae were exposed to one of three nitrate levels (5, 50, or 200 mg L−1 NO3−l) at 20 °C for 2 weeks. Subsequently, two heatwave scenarios were imposed: a short and moderate heatwave at 24 °C for 2 weeks, and a long and intense heatwave with an additional 2 weeks at 26 °C. A positive synergistic effect of heatwaves and nitrate on growth and metabolites was observed, but this also led to increased oxidative stress. In the short and moderate heatwave, oxidative damage was controlled by increased antioxidant levels. The high growth, metabolites, and antioxidants combined with low oxidative stress during the short and moderate heatwaves in moderate nitrate (50 mg L−1) led to a sustainable increased food availability to grazers. On the other hand, long and intense heatwaves in high nitrate conditions caused unsustainable growth due to increased oxidative stress and relatively low antioxidant (proline) levels, increasing the risk for massive algal die-offs.

The Association of Family Income, Birth Length, and Energy Intake with The Incidence of Stunting in Cibungbulang Sub-District

Stunting is a developmental disorder in toddlers characterized by H/A index z-score of less than -2SD. Based on the results of SSGI 2022, the prevalence of stunting among toddlers in Bogor Regency reached 24.9 percent. This study aimed to determine the relationship between family income, birth length, and energy intake with the incidence of stunting among toddlers in Cibungbulang District. The sample was 151 toddlers aged 24 – 59 months who were selected by systematic random sampling. Intake data were collected with 24-hour food recall, stunting by measuring heights, and other data were collected by interview using questionnaires. Most of the toddlers were male (57.6%) with fathers aged &gt;35 year (58.3%) and graduated from senior high school (34,4%) and mothers aged 21 – 35 years (70.2%) with high school diploma or its equivalent (34.4%). Most of the children-under-five had families with income below the regional minimum wage (88.1%), normal birth length (80.8%), adequate and excessive energy intake (53.6%). A total of 41.7 percent of toddlers were stunted. There were significant relationships between family income (p=0.022), birth length (p=0.040), and energy intake (p=0.040) with the incidence of stunting in toddlers (p&lt;0.05). It can be concluded that family income, birth length, and energy intake are related to the incidence of stunting in toddlers aged 24 – 59 months in Cibungbulang District. Maternal nutrition intake needs to be monitored carefully during pregnancy and home food gardening program should be promoted to increase food availability and income thus ensuring optimal children development.

Substaminale development in agricultural investments and the food security system

Agricultural investments play a crucial role in boosting productivity, reducing poverty, and enhancing food security. By increasing food availability and stabilizing prices, these investments make essential food more accessible to low-income groups. They also foster rural development through job creation and infrastructure growth, contributing to poverty reduction and consistent food consumption. In the face of challenges like climate change, shrinking land availability, declining fertility, and water scarcity, agricultural investments are vital for sustaining and increasing production. As global population growth heightens food demand, effective investment becomes even more critical to prevent famine. However, expanding agricultural land is limited, so future agricultural growth will rely on productivity improvements driven by investments. It is imperative for governments to create a conducive environment to attract such investments while ensuring that they are allocated efficiently. Mismanagement or ineffective use of investments can lead to negative social and environmental impacts. Therefore, continuous monitoring and analysis of agricultural investments are essential to maximize their effectiveness in ensuring food security.

Movement ecology and minimum density estimates of red foxes in wet grassland habitats used by breeding wading birds

The red fox (Vulpes vulpes) is a widely distributed generalist meso-predator implicated in declines of wading bird populations. In the wet grassland habitats where waders breed, wildlife managers work to mitigate fox predation risk to waders during the nesting period through lethal and non-lethal control methods. However, limited knowledge on fox movement ecology in these habitats makes it difficult to design effective management strategies. We used GPS telemetry to understand fox home range size, daily activity and movement patterns, and how these metrics may vary among wet grassland sites with different management. We caught and GPS-tagged 35 foxes in the March–June wader nesting period on two wet grassland sites in central southern England; Britford during 2016/17 and Somerley during 2018/19. We estimated home range areas from location data using local convex hulls, and from these estimates we derived the minimum fox density at each site and year. Daily activity patterns and movement behaviour of each fox were obtained using both telemetry and trail camera data. Mean fox home range area at Britford (0.21 km2, SE = 0.025) was significantly smaller than at Somerley (0.68 km2, SE = 0.067), and estimated minimum densities were around four times higher (Britford = 10.6 foxes/km2, Somerley = 2.4 foxes/km2). Foxes were more active and moved faster during twilight and night hours, but both telemetry and camera data indicate they were also active for one-third of daylight hours. Distances moved per day were variable between foxes but generally smaller at Britford. We also found evidence for dispersal during spring, with movements of up to 19 km per day. Home ranges at both wet grassland sites were smaller than comparable sites elsewhere. These indicated foxes were living at exceptionally high densities at Britford, where there is no fox control, increased food availability and where waders no longer breed. Spatio-temporal movement patterns were closely related to home range metrics, with higher levels of fox activity at Somerley, where home ranges were larger. The movements of itinerant and dispersing foxes during the nesting period suggests that lethal control would need to be very intensive to be effective. The likely anthropogenic food subsidy of fox density at Britford suggests that controlling access to similar food resources would help reduce predation pressure on breeding waders.

Living in the city: Reproductive and population ecology of Green Iguanas, Iguana iguana (Linnaeus 1758), inhabiting an urban landscape in Colombia

Understanding how species persist in urban landscapes can provide insights into the fate of biodiversityaffected by rapid and unplanned urbanization. While the ecological and conservation implications of urbanization havebeen reasonably well studied for temperate species, relatively little is known for those in tropical latitudes, especiallyNeotropical lizards. We investigated the life history, habitat use, and reproductive seasonality of Green Iguanas (Iguanaiguana) inhabiting an urban area in Colombia. Our analysis of age structure showed that the sex ratio in this populationwas approximately 1:1 at birth and adulthood, suggesting that both sexes are experiencing similar selective pressuresover time. The presence of individuals of all size classes throughout the year is indicative of a stable population. Densityestimates based on linear transect data indicated that iguanas in the studied population occur at higher densities thanthose in rural areas. This increased density might be related to some benefits of urbanization, including human trophicsubsidies and decreased predation and competence. The estimated growth rate was also higher than those reported forpopulations in natural habitats, likely reflecting increased food availability. Iguanas in the study area apparently reproducetwice per year, a pattern that might be explained by rainfall regime. Occupancy modeling revealed that contraryto rural populations, urban Green Iguanas successfully exploit open grassy areas for feeding and basking, with tree coverand built-up areas being key predictors of their occurrence. The ability of urban iguanas to modify some traits of theirbasic ecology to cope with the challenges imposed by urbanization may be crucial for this species to persist or eventhrive in cityscapes.