---
name: gcb-topic-selection
description: Use when deciding whether a research idea fits Global Change Biology (GCB) and how to frame its significance. GCB wants a mechanistic link between a global-change driver and a biological response, of broad relevance across systems. Tests fit and sharpens the question; it does not generate data or guarantee acceptance.
---

# Topic Selection & Fit (gcb-topic-selection)

GCB's remit is the **interface between global environmental change and biological systems**. A paper
fits when it shows **how a driver of global change affects (or is affected by) living systems** — and
why that matters beyond a single site or species. This skill tests fit and sharpens the framing before
you invest in design.

## When to trigger

- Deciding whether an idea belongs in GCB versus a regional, taxon-specific, or conservation-practice journal
- Framing the global-change **significance** and the **mechanism** up front
- Choosing the article type (Primary Research Article, Technical Advance, Review, Opinion/Perspective)

## The GCB fit test

1. **Is there a global-change driver?** Climate warming, drought, rising CO2 / tropospheric ozone,
   nitrogen deposition, land-use change, ocean change — an aspect of change that affects a substantial
   part of the globe.
2. **Is there a biological response or feedback?** A response or feedback in a biological system, at any
   level from **molecular to biome**, aquatic or terrestrial, managed or natural.
3. **Is the link mechanistic?** GCB rewards *why/how*, not just *that* a correlation exists.
4. **Is it broadly relevant?** The finding should generalize or transfer beyond one local context.
5. **Is the evidence commensurate?** Manipulation, observation/gradient, or modelling that can actually
   support a global-change claim at the stated scale.

## Sharpening the question

- State the driver, the response, the system, and the scale in one sentence.
- Name the **mechanism** you will test and the alternative explanations you will rule out.
- Decide whether the contribution is **empirical** (new mechanism/data), **methodological** (Technical
  Advance), or **synthetic** (Research Review) — that sets the article type.

## Fit triage at a glance

Run a candidate idea through this triage before committing. The verdict column reflects how GCB's scope
screen tends to treat each pattern; it is guidance, not a guarantee.

| Idea pattern | Driver? | Mechanism? | Broad reach? | Likely verdict |
|--------------|---------|------------|--------------|----------------|
| Warming alters microbial carbon cycling across biomes | Yes | Yes | Yes | Strong fit |
| Single-site phenology record, no mechanism | Weak | No | No | Reframe or redirect |
| Conservation action plan for one reserve | No | No | No | Out of scope |
| New flux-partitioning method tested globally | Implicit | Methodological | Yes | Technical Advance |
| Synthesis of eCO2 effects on N cycling | Yes | Yes | Yes | Research Review |

## Worked micro-example (illustrative)

An idea: "drought reduced tree growth in our forest plot." As stated it is a local description — likely
out of scope. Sharpened for GCB: "we test whether drought-induced growth decline is driven by hydraulic
failure versus carbon starvation, and whether the threshold transfers across an aridity gradient from
temperate to semi-arid forests." Now there is a named driver (drought), a contested mechanism (hydraulic
vs carbon), and cross-system reach (the aridity gradient). The same data, reframed around mechanism and
generality, becomes a candidate Primary Research Article. The framing is illustrative.

## Reframing pushback patterns

- "No mechanism, just a pattern" → state the competing mechanisms and which one the study adjudicates.
- "Reads as conservation practice" → recast the question as an ecosystem process or global-change
  feedback, not a management recommendation.
- "Relevant only to your site" → identify the gradient, biome, or system class over which the result is
  expected to generalize.

## Anti-patterns

- A local description with no global-change driver or broad relevance
- A conservation-management or policy plan with no mechanism (that is a different journal — GCB is
  global-change mechanisms and ecosystem processes, not conservation practice)
- "Climate change is important" framing with no specific driver-response mechanism tested
- A taxonomy/systematics or pure-methods piece with no global-change motivation

## Output format

```
【One-sentence fit】driver → response, system, scale
【Mechanism】what is being explained, not just correlated
【Broad relevance】why it matters beyond one site/species
【Evidence type】manipulation / observation / modelling / synthesis
【Article type】Primary Research Article / Technical Advance / Research Review / Opinion / Perspective
【Fit verdict】strong / needs reframing / out of scope → why
【Next】gcb-literature-positioning
```

## Supplementary resources

- [`../../resources/external_tools.md`](../../resources/external_tools.md) — global-change data sources by driver/system
- [`../../resources/official-source-map.md`](../../resources/official-source-map.md) — GCB aims-and-scope and article types