International Journal of Molecular Ecology and Conservation 2024, Vol.14, No.2, 109-121 http://ecoevopublisher.com/index.php/ijmec 112 hormonal regulation critical for reproduction. High temperatures have been linked to reduced sperm quality and altered ovarian cycles in some primate species, leading to lower reproductive success. For example, environmental stressors related to climate change can interfere with the hypothalamic-pituitary-gonadal axis, affecting the release of hormones that are essential for reproductive activities (ShikhMaidin, 2021). Additionally, prolonged exposure to heat stress during gestation can negatively impact fetal development, resulting in lower birth weights or higher infant mortality rates. These reproductive challenges are compounded by other factors such as habitat fragmentation and food scarcity, which are exacerbated by climate change. As a result, primates may experience longer interbirth intervals and decreased population growth, further threatening their survival. 4.3 Changes in disease patterns and their impact on primate health Climate change is altering the distribution and prevalence of infectious diseases, posing new health risks to primate populations. Warmer temperatures and changing precipitation patterns can expand the range of disease vectors such as mosquitoes and ticks, increasing primate exposure to diseases like malaria, dengue, and Lyme disease. For instance, shifts in temperature and humidity can enhance the survival and reproduction rates of these vectors, leading to more frequent outbreaks of vector-borne diseases (Lacetera, 2018). Moreover, primates living in fragmented habitats may face heightened disease transmission due to closer proximity to human settlements and livestock, which are reservoirs for various pathogens. The resulting increase in disease burden can lead to higher mortality rates, reduced reproductive success, and overall population declines. Climate-induced changes in disease dynamics not only threaten individual primates but also have broader implications for the stability and resilience of entire ecosystems. As diseases become more prevalent and spread to new areas, the long-term viability of many primate species may be at risk. 5 Impact on Primate Food Resources 5.1 How climate change affects the availability of food resources Climate change is altering the availability of food resources for primates by impacting the growth, distribution, and abundance of plant species that provide critical food sources. Rising temperatures, changes in precipitation patterns, and increased frequency of extreme weather events are causing shifts in the phenology of fruiting and flowering plants, leading to a mismatch between the timing of food availability and primate dietary needs. For example, studies have shown that fruit production in tropical forests is becoming more unpredictable, with some key fruit species producing less frequently or outside the usual seasons due to climatic shifts (Mendoza et al., 2017). These changes can lead to periods of food scarcity, forcing primates to adapt their foraging strategies, which may result in increased energy expenditure and reduced nutritional intake. In areas like Madagascar, where primates such as the black-and-white ruffed lemur (Varecia variegata) are highly dependent on specific fruiting patterns, the increased unpredictability of food resources could threaten their survival (Beeby et al., 2023). The overall impact of climate change on food availability is likely to vary across different primate habitats, but the trend towards greater unpredictability poses a significant risk to species that rely on consistent and abundant food supplies. 5.2 Shifts in fruiting patterns and plant phenology Climate change is driving significant shifts in the phenology of plants, particularly in the timing of fruiting and flowering, which directly impacts primates that rely on these resources. The seasonal availability of fruits is crucial for frugivorous primates, and any alteration in fruiting patterns can have cascading effects on their health and reproduction. Research has documented that in some tropical forests, fruiting events are becoming less synchronized, with fewer species fruiting simultaneously, leading to a reduced abundance of available fruits at any given time (Mendoza et al., 2017). Additionally, the phenology of fruit trees is increasingly influenced by climatic factors such as temperature and rainfall variability, which can lead to delayed or advanced fruiting seasons. For example, the Hainan gibbon (Nomascus hainanus) faces severe food scarcity during certain times of the year due to shifts in the fruiting phenology of its primary food sources, exacerbated by climate change (Xue et al.,
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