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The Role of Lion-Tailed Macaques in Seed Dispersal

Discover how lion-tailed macaques aid the growth of forests through seed dispersal.

K Bindu, Honnavalli N. Kumara, Rohit Naniwadekar

― 5 min read


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Table of Contents

Seed Dispersal is a crucial part of nature that helps plants grow in various areas. It involves moving seeds from one place to another, which can happen in different ways. In tropical regions, animals like monkeys, birds, and other creatures play a significant role in spreading seeds. This is especially true for lion-tailed macaques, which are interesting animals that not only eat Fruits but also help in planting new trees by dispersing seeds.

Who Are Lion-Tailed Macaques?

Lion-tailed macaques are a special type of monkey found in the Western Ghats mountains of India. They are known for their distinctive look, which includes a mane that resembles a lion. These monkeys mainly eat fruits, which make up about 70% of their diet. They have a hierarchical social structure, with different roles and ranks among group members.

The Importance of Fruit in Their Diet

These monkeys enjoy a variety of fruits, including native species like jackfruit and fig, and they also munch on some exotic fruits that have made their way into their habitat. While they are good at eating a range of fruits, their eating habits can vary based on their age and sex. For example, younger monkeys might be more adventurous in trying new fruits compared to the older ones.

How Do They Disperse Seeds?

So, how do these monkeys contribute to the spread of seeds? When macaques eat fruits, they often don’t digest the seeds completely. Some seeds are spat out, while others pass through their system and are deposited in their droppings. This process can help seeds travel further away from the parent plant, giving them a chance to grow in a new location.

The Social Side of Dispersal

The social structure of the lion-tailed macaques also affects how efficiently they disperse seeds. Males tend to dominate female monkeys, and this can influence which fruits they eat and how they behave while foraging. Some younger monkeys might be less assertive, leading them to consume different types of fruits compared to the dominant adult males.

Evidence of Differences in Diet

Research shows that different age and sex groups within these monkeys consume different amounts and types of fruits. Younger males might have a more varied diet, while dominant females might stick to specific fruits that are easier for them to access. These variations are important because they can affect the type of seeds that get dispersed and where they get planted.

Fruit Diversity and Preferences

Studies have recorded a variety of fruits that lion-tailed macaques consume, showing that their Diets include both native and non-native species. For instance, adult females might prefer certain non-native fruits due to their high energy content, while younger males may try a wider range of fruits. This preference affects the types of seeds that are spread around their habitat.

Tracking Movements and Seed Dispersal

To understand how far these monkeys travel and how many seeds they disperse, scientists track their movements and observe their feeding behaviors. They use GPS devices to monitor the daily distance traveled by the monkeys. Surprisingly, studies show that there is not much difference in the distances traveled by the different age and sex categories of these monkeys.

The Quality of Seed Dispersal

The effectiveness of seed dispersal is determined not only by the number of seeds spread but also by how and where they are deposited. The type of substrate, or surface, where the seeds land, can significantly affect their chances of germination. It turns out that male monkeys often deposit seeds in trees, which is actually a better spot for Ficus seeds to grow.

The Role of Invasive Species

In their disturbed habitats, lion-tailed macaques often encounter a lot of invasive plant species. These are plants that were introduced and are not native to the area. Interestingly, the monkeys tend to eat these invasive fruits just as much as, if not more than, native fruits. This raises important questions about how these monkeys contribute to the spread of unwanted plants in their environment.

Exploring Social Influence on Diet

The dynamics of their social hierarchy greatly influence which fruits the monkeys eat. Dominant males might consume more energy-rich fruits, while females and younger males may have a more varied diet. Understanding these interactions sheds light on how these primates impact their ecosystem and contribute to seed dispersal in different ways.

Implications for Forest Health

The food preferences of lion-tailed macaques highlight a fascinating aspect of frugivory—when animals eat fruits—and seed dispersal. By studying these monkeys, we can gain insights into how their behaviors affect plant diversity in tropical forests. If certain species are favored more than others, it could have downstream effects on which plants thrive in degraded areas.

Future Directions for Research

While current studies have provided valuable insights, there is much more to learn about the intraspecific differences in lion-tailed macaques. Future research could focus on how seasonal changes impact their dietary preferences and seed dispersal behaviors. It would also be intriguing to study the monkeys in more intact and undisturbed forests, allowing researchers to understand seed dispersal in healthier ecosystems.

Conclusion

In summary, lion-tailed macaques play an essential role in their ecosystem as seed dispersers. Their varied diets and behaviors help shape the plant communities in the forests they inhabit. By understanding their role better, we not only appreciate these fascinating creatures but also gain insights into the health and future of tropical forests. So next time you see a fruit-loving monkey, remember that it might just be a gardener in disguise, planting the seeds for tomorrow!

Original Source

Title: Age and sex influence seed dispersal of native and non-native plants by Lion-tailed Macaques Macaca silenus

Abstract: While interspecific variation in seed dispersal, a critical ecosystem process in tropical forests, is relatively well-studied, intraspecific variation as a consequence of differences in body size, foraging behaviours, and ranging patterns among age-sex categories within a species is relatively understudied. Among vertebrates, primates play a critical role in seed dispersal and exhibit behavioural differences between age and sex categories, making them a suitable study system for intraspecific variation in seed dispersal. Lion-tailed macaques Macaca silenus, an endemic and predominantly frugivorous primate species in the Western Ghats Biodiversity Hotspot, provide an excellent model for such studies. We examined the influence of age and sex on 1) the diversity and 2) the quantity of native and non-native fruits consumed, 3) the number of seeds dispersed, 4) seed dispersal distance, and 5) seed deposition substrates in lion-tailed macaques. We conducted over 375 hours of focal animal watches, distributed evenly across adult males, females, and subadults. Our findings showed that subadults consumed a higher diversity of native and non-native fruits than females and males. They dispersed fewer Ficus seeds than females. We found differences in the proportions of non-native fruits in the diets of different age- sex categories. Males consumed more Coffea liberica, whereas females and subadults fed on Coffea and Lantana. We found weak evidence suggesting that males were more likely to disperse Ficus seeds on trees, which are suitable substrates for Ficus establishment. Our study highlights that age and sex significantly influence seed dispersal patterns of native and non- native species by an endemic, frugivorous primate species with potential influence on recruitment.

Authors: K Bindu, Honnavalli N. Kumara, Rohit Naniwadekar

Last Update: 2024-12-13 00:00:00

Language: English

Source URL: https://www.biorxiv.org/content/10.1101/2024.12.09.627456

Source PDF: https://www.biorxiv.org/content/10.1101/2024.12.09.627456.full.pdf

Licence: https://creativecommons.org/licenses/by/4.0/

Changes: This summary was created with assistance from AI and may have inaccuracies. For accurate information, please refer to the original source documents linked here.

Thank you to biorxiv for use of its open access interoperability.

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