Research Paper Writing Assistant

Section 1: Sharpening Your Topic

I'll go through the five sections one at a time. Your answer to the question at the end of this section affects what I'd recommend in the later ones.

Why your current question needs narrowing

"How do microplastic concentrations in urban stream sediments affect macroinvertebrate biodiversity in the Pacific Northwest?" is a good starting point, but it has three problems for a 3,000-word paper:

• It's descriptive, not arguable. "How does X affect Y" invites a summary. A strong paper takes a position that a reasonable scholar could dispute.
• "Affect" implies causation the evidence may not support. Most causal evidence comes from lab exposures, often at concentrations far above field levels. Most field evidence is correlational. That gap is worth writing about, not hiding.
• Urban stressors are confounded. Urban streams show "urban stream syndrome" (Walsh et al., 2005). Impervious cover, flashy hydrology, warming, metals, PAHs, and fine sediment all rise alongside microplastics. Isolating a microplastic signal is very hard, and a sophisticated paper acknowledges that directly.

Scoping moves that make it defensible

• Geography: Narrow "Pacific Northwest" to the Puget Sound lowlands. That region has a long-term benthic dataset, the Puget Sound Stream Benthos database, which uses the B-IBI (Benthic Index of Biotic Integrity) scoring system.
• Biodiversity metric: Pick one, such as B-IBI, EPT richness (mayflies, stoneflies, caddisflies), or functional feeding groups. "Biodiversity" alone is too vague.
• Particle type: Consider tire wear particles (TWP), a regionally significant microplastic-adjacent pollutant. This is where PNW research is strongest, after the discovery that 6PPD-quinone, a tire-derived chemical, drives coho salmon urban runoff mortality (Tian et al., 2021, Science).

Verify every citation I mention yourself before using it. Treat them as leads, not confirmed references.

Three candidate research questions

Option A: Evidence-weighing synthesis

RQ: Does current evidence support sediment microplastics as an independent driver of macroinvertebrate decline in urban Puget Sound streams, or are they better understood as a secondary stressor within urban stream syndrome?

Possible thesis: Although laboratory studies show harm to benthic taxa, the mismatch between experimental and environmental concentrations, plus confounding urban stressors, means microplastics are currently best characterized as a plausible but unproven contributor to biodiversity loss. Monitoring should prioritize particle types with demonstrated toxicity, such as tire wear particles.

Option B: Trait-based vulnerability argument

RQ: Which macroinvertebrate functional feeding groups are most exposed and most sensitive to sediment-bound microplastics, and what does this predict for B-IBI scores in urban streams?

Possible thesis: Collector-gatherers and burrowers face the highest exposure, but those groups (e.g., chironomids, oligochaetes) are already pollution-tolerant. This suggests microplastic impacts on B-IBI may be muted or masked, which is a paradox with monitoring implications.

Option C: Tire wear particles as a distinct stressor

RQ: Should tire wear particles be treated separately from conventional microplastics when assessing risk to macroinvertebrates in Puget Sound urban streams?

Possible thesis: Tire wear particles differ from conventional microplastics in abundance, source pathway (road runoff), and chemical toxicity (leachates such as 6PPD-quinone). Lumping them together obscures the most likely microplastic-related threat to urban stream invertebrates.

My recommendation

Option A is the safest strong choice. It's clearly arguable, draws on abundant literature, and shows critical thinking about evidence quality, which instructors reward at your level. If you want to stand out, fold C into A by making tire wear particles your case study in the final body section.

A quick test for any thesis: Could a published researcher disagree with it using evidence? If not, it's a summary, not an argument.

❓ Question before Section 2

Is this a literature-based paper, or will you be collecting or analyzing data, such as field samples, a class dataset, or public B-IBI records?

This changes your sources, your outline (a synthesis-style review vs. an IMRaD structure with Methods and Results), and your timeline, so I'll wait for your answer before building the research strategy. If you already lean toward A, B, or C, tell me that too.