Asa Wright: what it takes to measure a forest

Asa Wright Nature Centre sits in the rainforest of Trinidad’s Northern Range, on some 1,300 acres protected since 1967 ¹. Its reputation rests on birds — more than 170 species recorded — and on the oilbirds of Dunston Cave ¹. Spring Hill, the planter’s house built in 1906–08, still anchors the property; since 2023 its 29-room lodge has been run under a concession by HADCO Experiences ¹. Those facts describe a protected place. They do not yet describe the condition of the forest, and the gap between the two is the subject of this piece.

The range around the valley

The Northern Range runs along Trinidad’s northern edge as a geological continuation of the coastal mountains of Venezuela’s Paria Peninsula, rising to 925 metres ⁶. Its forests do more than shelter birds. The range’s watersheds are the most significant contributors to Trinidad’s freshwater supply, and they help to limit flooding in the low-lying foothills below ⁷. Six Key Biodiversity Areas have been identified across the wider range, covering more than 36,000 hectares; and the range holds the entire known population of the Trinidad piping-guan ⁶.

The pressures are long documented. The Northern Range Assessment, run from 2003 to 2005 by the Cropper Foundation and the University of the West Indies as part of the global Millennium Ecosystem Assessment, and published as the country’s State of Environment Report, found that forests had declined in extent and quality of cover, especially in the west, that housing and agriculture were encroaching in the east, and that fires were reaching primary forest ⁸. A 2021 Trinidad Guardian investigation cited an Environmental Management Authority report from about a decade earlier that put forest cover loss at 32%, at 0.31% a year, and noted that no recent national figure existed ⁷. It named quarry operators, slash-and-burn farmers and squatters as the main causes, with clearing accelerating during the pandemic ⁷.

From planter’s house to land trust

Asa Wright, born in Iceland in 1892, and her husband Newcome Wright bought Spring Hill in 1946 and ran it, with difficulty, as a cocoa, coffee and citrus estate at about 350 metres in the Arima Valley ². When the naturalist William Beebe bought the neighbouring Simla estate in 1949, scientists followed him to the valley, and Asa Wright began to host them ². In 1967 repeat guests and local supporters raised the money to buy the estate, and the Centre was set up in trust as a wildlife sanctuary ²³. In 1975 the New York Zoological Society gave it the Simla research station ².

Over time the Centre became a land conservation trust for forest in the lower Arima Valley and the neighbouring Aripo Valley. In 1995 the government granted it a 99-year lease on land inside the Northern Range Forest Reserve, as compensation for encroachment by a state-owned quarry ². Quarrying has stayed close. The Trinidad Express reported the Centre’s chair objecting to a rush to take control of the state-owned Scott’s Quarry, one of four large limestone quarries in the Arima Valley, and listing the risks: noise and blasting near the oilbird caves, polluted watercourses, and worked-out pits left without replanting ⁹. In 2023 Caribbean Beat reported that National Quarries had begun staggered blasting and was said to be moving towards gentler excavation methods ³.

Closure and a concession

The pandemic nearly ended the lodge. The Centre was closed for almost three years, with no visitors, no revenue, no endowment and no direct government assistance, and in 2021 it closed the lodge business and let its staff go ⁴. In September 2021 the board invited proposals to run the lodge, so that the trust could concentrate on what it called its “core mission of conservation, education and scientific research”, and chose HADCO ⁵. HADCO’s ten-year concession began on 1 January 2023, with about TT$14 million invested in renovation; the trust kept the conservation and research work ⁴. The split matters for measurement. The forest, the trails and the lodge are now looked after by two organisations, and evidence about the forest’s condition has to come from both.

A baseline, reported

As it works towards Regenera Luxury certification, the Centre has reported a set of baseline indicators: 100% local employees, 100% local senior management, 90% of operations free of single-use plastic, 80% renewable energy and 75% biodegradable cleaning products ¹. Every one of these figures is reported by the property and pending verification; on our scale they are documented but not yet verified ¹.

What the measurement has already found

The more interesting findings are the uncomfortable ones. A Green Key audit in November 2025 flagged high levels of chemical and biochemical oxygen demand — COD and BOD5, two measures of organic load — in the Centre’s wastewater, and a retest was due within 90 days ¹. In a valley where pollution of watercourses and the Arima River was already a concern in the quarry dispute ⁹, that is not a trivial finding. Biodiversity baselines, the obvious headline for a place famous for its birds, are still being established; biodiversity indicators are listed as in measurement ¹. At baseline the Centre also had no regeneration committee and no master plan; both are now being built, alongside named KPI owners, an evidence library and a monthly review ¹.

What measuring a forest actually requires

A species list is not a baseline. Knowing that a valley has recorded more than 170 bird species says what has been seen over decades, not whether populations are stable, rising or falling. A baseline that can show change needs fixed survey points or transects, repeated in the same season with the same method, with the raw data kept; counts at indicator sites such as the oilbird colony; measures of forest structure and canopy; and, for a watershed property, regular water-quality sampling in the streams as well as at the outfall. It also needs someone to own the data when staff and operators change. None of it is exotic, only slower and less photogenic than a bird list.

The Centre’s own pathway reflects that order. Biodiversity baselines sit in the current governance-and-evidence step; the wastewater retest and verification come next; an independent audit is the final step ¹. Biodiversity, water and circularity are all listed as still being measured ¹.

The awards data helps only at a distance. The case study lists no awards assessment for Asa Wright ¹. The one scored property in the same operator’s portfolio is Mt. Plaisir Estate Hotel at Grande Riviere, whose weakest biodiversity dimension was monitoring, indicators and scientific credibility, at 2.90 out of 5 ¹⁰. That is a different place and a different ecosystem, so it says nothing about the Arima Valley’s forest. It does suggest that monitoring is the common gap, not a local accident.

Where it stands

The Centre is on Regenera Luxury’s Signature pathway, at step 5 of 7, with a target of 150 KPIs; its strongest sections so far are operations, environmental benefits, local economic regeneration and monitoring ¹. Section scores will not be published until a reassessment three months in ¹.

Why it matters for destinations

Protected land is not the same as measured recovery. The Northern Range’s forests are among Trinidad’s defining assets, and a nature centre with six decades of protection behind it is precisely where one would expect the evidence to be strongest. That the first rigorous pass found a wastewater problem and missing biodiversity baselines is not a failure; it is what honest measurement looks like at the start. For the wider range, where national forest-cover data is itself a decade old ⁷, a single valley with repeatable, published counts would be worth more than its size suggests. The test will be whether the retests, baselines and audit results are published as promised. Our Trinidad and Tobago profile follows the islands’ wider conservation record.