📄 earth_science

Operationalizing the Urban Biotechnosphere Framework for Coastal Resilience Assessment: A Case Study of Manta, Ecuador

This paper applies the urban biotechnosphere framework to Manta, Ecuador, revealing that between 2010 and 2024, integrated urban development exceeded the city's natural-regulating capacity by 24.80% due to significant declines in spatial-environmental quality and natural components, thereby highlighting the urgent need for a coordinated territorial agenda to restore ecological equilibrium.

Original authors: Diana Zuleta-Mediavilla, Natalia Alvarado-Arias, Patricio Simbaña-Escobar, Mayte Cuesta-Tabares

Published 2026-07-03

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CC BY 4.0

Original authors: Diana Zuleta-Mediavilla, Natalia Alvarado-Arias, Patricio Simbaña-Escobar, Mayte Cuesta-Tabares

Original paper licensed under CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/). ✨ This is an AI-generated explanation of the paper below. It is not written or endorsed by the authors. For technical accuracy, refer to the original paper. Read full disclaimer

The Big Picture: A City on a Tightrope

Imagine the city of Manta, Ecuador, as a person walking a tightrope. On one side of the rope is Human Growth (more people, more buildings, better roads, and more jobs). On the other side is Nature's Support System (trees, mangroves, clean water, and the land's ability to absorb pollution and storms).

For a city to be safe and resilient, these two sides need to be balanced. If the "Human Growth" side gets too heavy while the "Nature" side gets too weak, the person falls off the tightrope. This paper is a report card on how well Manta has been balancing on that rope between 2010 and 2024.

The Tool: The "Urban Biotechnosphere" Scale

The researchers used a special measuring tool called the Urban Biotechnosphere Framework. Think of this like a smart home thermostat for the city. Instead of just measuring the temperature, it measures five different "rooms" in the city's house to see if the whole system is comfortable:

The Natural Room (KP): How much nature is left? (Trees, mangroves, clean air).
The People Room (KSE): How many people are there, and are they poor or employed?
The Service Room (KF): Do we have working toilets, clean water, and sewers?
The Access Room (KD): Can people easily get to schools, hospitals, and buses?
The Space Room (KOSE): Is the city green and organized, or is it a concrete jungle with no room to breathe?

What They Found: The "Imbalance" Alarm

The researchers calculated a score called the Biotechnosphere Equilibrium Ratio (BER).

A score of 1.0 means the city is perfectly balanced (Nature and Growth are equal).
A score above 1.0 means the city is growing faster than nature can handle.

The Results for Manta in 2024:

The Score: Manta's score was 1.2480.
What it means: The city is currently 24.8% heavier on the "Human Growth" side than the "Nature" side. It has slipped off the perfect balance point into a state of "low-to-moderate imbalance."

The Good News (The Upward Trend):
The "Service Room" (water/sewage) and the "Access Room" (roads/schools) got much better. It's like the city built a new, stronger floor and added better elevators. People have better access to things than they did in 2010.

The Bad News (The Downward Trend):
While the city got better at serving people, the "Nature Room" and the "Space Room" got worse.

Nature (KP): Dropped by about 6%. The land is less able to absorb shocks.
Space (KOSE): Dropped by a huge 21.6%. This is the biggest problem. The city became more crowded with concrete, lost green areas, and became less organized.

The Analogy: Imagine you are building a bigger house (adding rooms and better plumbing). But while you are doing that, you are also tearing down the foundation and removing the garden that keeps the house cool. The house is bigger and has better pipes, but it is sitting on a sinking foundation.

The Future: Where is the City Going?

The researchers looked at the trend and asked, "If Manta keeps doing exactly what it is doing now, what happens in 2030?"

The Prediction: By 2030, the imbalance score will rise to 1.3520.
The Meaning: The city will be even further out of balance. The "Human Growth" side will get heavier, and the "Nature" side won't catch up. It's like walking further out on the tightrope without fixing the wobble.

The Solution: How to Get Back on the Rope

The paper argues that you can't just keep building more roads or sewers to fix this. To get back to a score of 1.0 (balance), Manta needs to treat nature and space as seriously as it treats construction.

The recipe for balance includes:

Fixing the Foundation: Restoring mangroves and coastal vegetation so the land can handle storms and pollution again.
Stopping the Concrete Spread: Controlling how fast the city spreads out and making sure there is more green space for every person.
Smarter Infrastructure: Building sewage and water systems that actually clean the environment, rather than just moving the waste around.

The Bottom Line

Manta is a city that is growing and improving its services, but it is doing so at the expense of its natural safety net. The paper warns that if the city doesn't stop prioritizing only growth and start prioritizing balance, it will become less resilient to climate change and environmental disasters. The goal isn't to stop growing, but to grow in a way that doesn't break the floor beneath it.

Technical Summary: Operationalizing the Urban Biotechnosphere Framework for Coastal Resilience Assessment in Manta, Ecuador

Problem Statement
Coastal port cities face a complex tension between rapid urban growth, strategic infrastructure demands, and fragile ecosystems. In intermediate Latin American cities like Manta, Ecuador, planning decisions are often made with incomplete data, leading to a cumulative imbalance where demographic and infrastructural expansion outpaces the territory's natural-regulating capacity. Existing frameworks often treat urban growth, infrastructure, and ecological degradation as separate layers. This paper addresses the need for an integrated diagnostic tool capable of measuring the proportionality between integrated urban development and the natural systems that sustain it, specifically in contexts where continuous, high-resolution environmental data is scarce.

Methodology
The study applies the Urban Biotechnosphere Framework to Manta for the period 2010–2024. The methodology is a multivariable, diagnostic composite-index approach designed to be transparent and replicable despite data constraints.

Indicator System: The framework operationalizes five components:
- KP (Natural Component): The regulating capacity (vegetation, mangroves, ecosystem condition).
- KSE (Socio-Economic Component): Human demand (population, density, poverty, employment).
- KF (Functional Component): Infrastructure capacity (water, sanitation, wastewater treatment).
- KD (Accessibility Component): Access to vital services (health, education, transport).
- KOSE (Spatial-Environmental Quality Component): Urban form and environmental quality (green area per capita, built-up expansion, impervious surfaces).
Data Treatment: Recognizing the lack of continuous annual municipal data, the authors utilized a mix of observed, interpolated, proxy, institutional, and spatially derived (GIS/satellite) data. All indicators were normalized to a [0,1] scale using min-max normalization.
Weighting and Aggregation: An Analytic Hierarchy Process (AHP) was used to assign theoretical weights based on the framework's internal logic (KP = 0.35, KF = 0.25, KSE = 0.18, KOSE = 0.12, KD = 0.10).
- An Integrated Urban Development Index ( $K_{urban}$ ) was calculated as the weighted average of the four non-natural components (KSE, KF, KD, KOSE).
- The Biotechnosphere Equilibrium Ratio (BER) was derived as the ratio of the urban index to the natural component: $BER = K_{urban} / KP$ .
Classification: The study proposes an operational scale for BER:
- C1 (Equilibrium): BER $\approx$ 1.
- C2 (Imbalance): BER > 1 (Urban pressure exceeds natural capacity).
- C3 (Reserve): BER < 1 (Natural capacity exceeds urban pressure).

Key Results

Divergent Trends: Between 2010 and 2024, Manta's socio-economic (KSE +26.02%), functional (KF +27.89%), and accessibility (KD +21.07%) components improved. Conversely, the natural component (KP) declined by 6.10%, and the spatial-environmental quality component (KOSE) deteriorated significantly by 21.60%.
Equilibrium Status: In 2024, the BER reached 1.2480. This indicates that integrated urban development exceeded the estimated natural-regulating capacity by 24.80%.
Classification: Manta is classified as C2 (Low-to-Moderate Imbalance). The primary driver of this imbalance is the sharp decline in spatial-environmental quality (KOSE), followed by the weakening of natural-regulating capacity (KP). Improvements in infrastructure and accessibility did not compensate for these environmental losses.
2030 Projection: Under a continuation scenario based on the observed linear trend, the BER is projected to rise to 1.3520 by 2030, moving the city further from equilibrium.

Key Contributions

Operationalization of Theory: The paper translates the conceptual Urban Biotechnosphere framework into a measurable, planning-oriented diagnostic indicator (BER) applicable to data-constrained coastal cities.
Relational Diagnosis: It demonstrates that urban resilience cannot be assessed solely by infrastructure improvements. The study reveals that a city can simultaneously improve accessibility and services while losing the spatial and natural foundations required for long-term habitability.
Methodological Transparency: The study provides a replicable structure for handling heterogeneous data sources (interpolated, proxy, satellite-derived) common in Latin American urban planning, explicitly documenting data treatment categories to ensure robustness.
Policy Integration: The framework links specific planning dimensions—sanitation, port-city management, land-use control, and ecosystem restoration—into a single territorial agenda aligned with SDGs 11, 13, 14, and 15.

Significance and Claims
The authors claim that the primary value of this research lies in its ability to force a systemic interpretation of urban-coastal dynamics. By quantifying the gap between urban development and natural regulation, the BER serves as an early-warning indicator. The study argues that for Manta, and similar intermediate cities, returning to equilibrium (C1) requires more than isolated sectoral actions; it demands a coordinated strategy that treats spatial-environmental quality and natural-regulating capacity as central planning variables equal in importance to economic and infrastructural growth. The paper concludes that while Manta is not yet in a critical state of structural imbalance, the current trajectory is unsustainable without intervention to restore natural capacity and improve spatial order.