Reading path: Underwater images and evidence →
Name what the figure contains
Begin by identifying the variables and units, not by announcing what you think the figure proves. State what appears on each axis or what categories the panels compare. Include the population or sample type when the caption identifies it. “The plot compares water temperature in degrees with animal detections per tow across three stations” gives readers a usable map of the visual.
Check the caption for symbols, sample sizes, and the meaning of any bars or shaded regions. If the figure has multiple panels, describe the relevant panel explicitly. The same color may represent a site in one figure and a depth band in another, so use the legend rather than relying on visual intuition.
Describe the pattern literally
Next, state what the plotted values do. Are they generally higher in one group, rising over time, widely variable, or clustered around a similar range? Use calibrated language: “tends to,” “in this sample,” or “the highest values appear” when the pattern is uneven. Avoid explaining the pattern at this stage; a plot can show that two variables move together without showing why.
For example, if counts are higher at a middle depth on three of four dates, say so. That description is more informative than “depth affects abundance,” because it preserves the exception and does not claim a cause. If the visual difference is small relative to variation, mention that rather than treating any visible separation as a decisive ecological effect.
Include a limitation that matters
A useful limitation is specific to the evidence shown. It might be that the data cover only two stations, that the time series spans one season, that the y-axis shows detections rather than total abundance, or that observations are aggregated into averages. Choose a caveat that changes how widely the figure can be interpreted, not a generic statement that more research is needed.
Consider a map of animal observations concentrated near a coastline. The map can show where detections were recorded, but if survey effort was also concentrated there, it cannot by itself establish that animals are less common offshore. A figure summary should note when sampling coverage or observation effort shapes the visible pattern.
Use a three-part sentence
A reliable format is: “This figure shows [variables and unit]; [pattern visible]; [one limit].” For instance: “The figure plots daily temperature against detections per tow; counts are generally higher in the cooler samples; observations come from two stations over five days.” The sentence is concise, yet it tells a reader what evidence the figure contributes and where its reach ends.
Then compare your summary with the paper's text. If the authors make a stronger claim, check whether other panels or analyses supply additional evidence. If your description conflicts with theirs, verify axis direction, units, grouping, and caption notes. Careful summaries make figures easier to discuss and help prevent a memorable visual from being stretched into a conclusion it does not support.
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