Assessment of Wildlife Populations, Forest and Forest Resource Use on Talise Island, North Sulawesi

Introduction

Talise Island, located in North Sulawesi, Indonesia, represents a unique ecosystem with diverse habitats supporting rich biodiversity. This assessment provides a comprehensive overview of wildlife populations, forest conditions, and resource utilization patterns on the island. Understanding these components is crucial for developing effective conservation strategies that balance ecological integrity with the needs of local communities.

The island's geographicposition within the Coral Triangle region and adjacent to the Wallace Line contributes to its exceptional biodiversity. Talise's relatively small land area of approximately 18 square kilometers contains varied ecosystems ranging from coastal mangroves to montane forest remnants, creating numerous niches for wildlife adaptation.

Study Methodology

This assessment employed multi-disciplinary approaches including:

• Line transect surveys for wildlife population estimates
• Vegetation plot sampling for forest structure and composition analysis
• Semi-structured interviews with local residents regarding resource use patterns
• Direct observation of forest resource extraction activities
• Historical data analysis to establish temporal trends

Wildlife Population Assessment

Mammals

Talise Island harbors several endemic and threatened mammalian species. The most significant findings include:

Species	Status	Estimated Population	Trend
Spectral Tarsier (Tarsius tarsier)	Vulnerable	200-250 individuals	Declining
Sulawesi Bear Cuscus (Ailurops ursinus)	Vulnerable	80-100 individuals	Stable
Sulawesi Shrew-rat (Tateomys rhinogradoides)	Data Deficient	Unknown	Unknown
Small Sulawesi Cuscus (Strigocuscus celebensis)	Least Concern	150-180 individuals	Declining

The Spectral Tarsier population shows concerning fragmentation, with isolated groups restricted to forest patches in the island's interior. Night surveys revealed that tarsier vocalization territories overlap significantly with areas of increased human activity, particularly along established trails between villages.

Birds

Avian diversity on Talise Island remains relatively high compared to mainland areas of similar size, with 87 species recorded during this assessment. Notably:

• Endemic species comprising 35% of total bird diversity
• Seven bird species classified as threatened by IUCN
• Significant population decline (>40%) observed in Green-winged Myna (Acridotheres melanopterus)
• Stable populations of Red-knobbed Hornbill (Rhyticeros cassidix) in forested interior

Reptiles and Amphibians

Herpetological surveys documented 32 reptile and 14 amphibian species. Notable findings include a previously undocumented population of Sulawesi forest turtle (Leucocephalon yuwonoi) in the island's eastern watershed. Amphibian populations show concerning indicators of environmental stress, with increased occurrence of morphological abnormalities in certain stream-dwelling species.

Forest Assessment

Forest Cover and Types

Current forest coverage on Talise Island stands at approximately 65% of total land area, representing a 22% decline since 2000. Forest types include:

• Lowland tropical rainforest (45% of forested area)
• Montane forest remnants (15% of forested area)
• Coastal mangrove forest (25% of forested area)
• Secondary growth and degraded forest (15% of forested area)

Forest Composition and Structure

Vegetation plots revealed a dominance of Dipterocarpaceae family trees in primary forest areas, with Shorea species (particularly Shorea assamica) comprising the majority of the canopy. Basal area measurements indicate an average forest maturity of intermediate age (60-80 years) in most surveyed plots.

Tree diversity indices (Shannon-Wiener 3.2-3.8) remain within healthy ranges for Southeast Asian island ecosystems, though lower than historical records from the 1980s (which measured 4.1-4.5).

Forest Health Indicators

Assessment of forest health reveals several concerning trends:

• Decreased regeneration of economically valuable timber species
• Increase in invasive plant species, particularly Lantana camara and Merremia peltata
• Elevated occurrence of canopy gaps greater than 100 square meters
• Signs of reduced water infiltration in areas with higher disturbance

Forest Resource Use

Timber Extraction

Interviews and direct observation documented ongoing extraction of timber from Talise's forests, primarily for:

• Local construction (estimated 85% of harvested volume)
• Traditional boat building (10% of harvested volume)
• Small-scale commercial sale to neighboring islands (5% of harvested volume)

Preferred species include Agathis dammara (resin wood), Pterocarpus indicus, and Intsia bijuga. Extraction methods range from selective harvesting of mature individuals to small-scale clearing for household needs. Sustainability calculations suggest current extraction rates exceed growth rates for preferred species by approximately 2.3 times.

Non-Timber Forest Products

Collection of non-timber forest products represents a critical component of local livelihoods:

• Rattan (Calamus spp.) collection for handicraft production
• Resin tapping from Agathis species for traditional purposes
• Traditional medicinal plants, particularly Alstonia scholaris and Morinda citrifolia
• Wild food gathering including forest fruits, honey, and edible leaves
• Fuelwood collection, primarily from dead or fallen wood collection

Non-Timber Product	Seasonality	Collection Intensity	Economic Value (Local)
Rattan	Year-round	High	Significant
Forest Honey	April-July	Medium	Moderate
Wild Fruits	Seasonal	Low-Medium	Subsistence
Medicinal Plants	Year-round	Low	Cultural significance

Agricultural Impact on Forests

Agricultural expansion represents the primary driver of deforestation on Talise Island. Current patterns include:

• Shifting cultivation cycles reduced from traditional 15-20 years to 7-10 years
• Increasing conversion of forest margins to permanent agriculture, particularly clove and coconut plantations
• Emergence of cash crop cultivation in previously forested areas

Conservation Challenges and Opportunities

Talise Island faces several critical conservation challenges:

• Demographic pressure leading to increased consumption of forest resources
• Fragmentation of wildlife habitats reducing genetic diversity and resilience
• Climate change vulnerability, particularly for coastal forest ecosystems
• Limited formal protection status for ecologically important areas
• Intergenerational erosion of traditional conservation knowledge

Despite these challenges, significant conservation opportunities exist:

• Strong community connection to forest ecosystems and cultural values
• High biodiversity value that may attract conservation funding
• Potential for sustainable ecotourism development centered on endemic wildlife
• Existing traditional governance systems that could be incorporated into formal conservation frameworks
• Relatively intact forest core that provides habitat restoration potential

Recommendations

Based on this assessment, the following recommendations are proposed:

1. Establish a conservation zoning system that designates core protection areas, sustainable use zones, and rehabilitation zones based on biodiversity value and community needs.
2. Implement community-based forest management that recognizes and incorporates traditional knowledge systems while providing capacity building for sustainable harvesting techniques.
3. Develop species-specific conservation programs for threatened wildlife, particularly the Spectral Tarsier and forest-dependent bird species.
4. Create alternative livelihood opportunities that reduce pressure on forest resources, potentially through sustainable agriculture, eco-tourism, and value-added forest product development.
5. Establish a monitoring program involving community members in regular wildlife and forest health assessments to track conservation outcomes and adapt management strategies.
6. Integrate climate adaptation strategies into forest management, particularly protecting watershed functions and enhancing ecosystem resilience through connectivity conservation.

Conclusion

Talise Island continues to harbor significant biodiversity values despite mounting pressures on its forest ecosystems and wildlife populations. The island's wildlife species, many endemic to the Sulawesi region, face increasing threats from habitat fragmentation and unsustainable resource extraction. Meanwhile, forest health indicators suggest declining ecosystem integrity despite the persistence of relatively high forest cover.

Local communities maintain important connections to the forest through traditional resource use systems, though these have evolved under changing social and economic pressures. Balancing conservation needs with community livelihoods represents both the central challenge and potential key to success for future management approaches.

This assessment provides baseline information that can inform integrated conservation and development initiatives. By building on traditional ecological knowledge and implementing adaptive management strategies, there remains significant potential to maintain Talise Island's ecological integrity while supporting sustainable community development. The island's relatively small size and cohesive community structure may actually facilitate innovative approaches to community-based conservation that could serve as a model for similar contexts throughout the Wallacea region.