Fixed transect monitoring, 16 transects, 1,600 quadrats

Oceanography research poster example

Kelp canopy cover at sixteen fixed reef transects over five consecutive summers, laid out as an A0 landscape board in two rows. The top row carries the method and the figure on a light ground, and the bottom row sets the results in a dark card that pulls the eye down.

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CU
Twenty one points of canopy in five summers: kelp cover at sixteen reef transects
E. Tavares ¹, N. Haruki ¹, D. Callaghan ¹ ²
1 Institute of Marine Science, Calderbay University · 2 Reef Monitoring Programme, Calderbay University
Abstract
Sixteen fixed reef transects were surveyed by divers in five consecutive summers using photo quadrats, twenty quadrats per transect per summer, 1,600 quadrats in total. Mean kelp canopy cover fell from 62% in the first summer to 41% in the fifth, a loss of 21 percentage points. The fall is not uniform with depth: shallow transects between 2 and 6 metres lost 32 points while transects below 12 metres lost 6, and the depth at which cover halves moved upward by about 3 metres across the five years. Fourteen of the sixteen transects fell. The two that did not are the deepest in the set, at 16 and 18 metres, and both moved by under two points either way across the whole period. Mean cover by summer runs 62%, 58%, 51%, 45% and 41%, so the series falls in every year rather than in a single step.
Fixed transects, one method
Canopy cover estimates are notoriously sensitive to method, and much of the published disagreement about kelp decline comes from comparing a drop camera survey with a diver survey, or a summer count with an autumn one. This programme holds all of that constant. The same sixteen transects, marked with permanent pins, are surveyed by divers in the same eight week window each summer with the same quadrat frame, the same camera and the same scoring rule, and the images are scored by a person who cannot see the year. What the design gives up is spatial coverage, since sixteen transects over one 40 kilometre stretch of coast cannot speak for the region. What it buys is a series where a 21 point fall cannot be an artefact of changing the method, which is the single most common alternative explanation.
METHODS
Transects. Sixteen permanent 50 m transects on rocky reef, depths from 2 to 18 m, pins relocated by GPS.
Sampling. Twenty 0.25 square metre photo quadrats per transect per summer, 1,600 quadrats in total.
Timing. The same eight week summer window each year, five consecutive summers.
Scoring. 100 point overlay per image, scored blind to year by a single trained scorer.
Analysis. Transect means then a depth banded comparison; transects are the unit, not quadrats.
21 points
of kelp canopy cover lost
From 62% to 41% across 16 transects and five summers; the shallow band lost 32
%
2021
2025
020406080
Figure 1. Mean kelp canopy cover across the sixteen transects, first summer and fifth.
Source: 1,600 photo quadrats, five consecutive summers.
Results
Mean cover by summer runs 62%, 58%, 51%, 45% and 41%, a fall in every year of the series with the steepest single step between the second and third summers. Fourteen of the sixteen transects fell; the two that did not are the deepest in the set, at 16 and 18 metres, and both moved by under two points in either direction across the whole period. Split by depth band, the picture is a shallow water loss rather than a general one. The 2 to 6 metre band fell from 71% to 39%, a loss of 32 points across six transects. The 6 to 12 metre band fell from 64% to 44%, a loss of 20 points across six transects. The band below 12 metres fell from 44% to 38%, a loss of 6 points across four transects. Reading down the depth gradient in the final summer, cover is 39%, 44% and 38%, so the shallow band has dropped below the mid band for the first time in the series and the old pattern of highest cover in the shallows has inverted. Weighted by the six, six and four transects in the three bands, those figures reproduce the 62% and 41% means. The depth at which cover falls below half its shallow water maximum moved from about 11 metres in the first summer to about 8 in the fifth. Quadrat level variation within a transect was wide throughout, with a standard deviation of 18 to 24 points in every summer, which is why the transect rather than the quadrat is the unit of analysis and why a single quadrat photograph from this series says almost nothing on its own.
What is driving it, and what this design cannot say
A loss concentrated in the shallows and absent below 12 metres points at something that acts from the surface down. Summer sea surface temperature at the nearest moored logger exceeded the local kelp stress threshold on 11 days in the first summer of the series and 34 days in the fifth, and the two worst years for that count are the two years with the steepest cover fall. Urchin barrens were recorded on three of the sixteen transects, all in the mid band, and those three fell no faster than their neighbours, so grazing is unlikely to be the main driver here even though it is elsewhere on this coast. None of that is a test. This design has no control coast, no manipulation and one region, so it can describe a decline and rank the candidate drivers by plausibility, not establish one. Three things would change that and none of them is expensive: a matched set of transects on the cooler coast 200 kilometres south, a logger on each transect rather than one for the region, and a fixed quadrat subset revisited within a summer to put an error bar on the seasonal estimate itself. Cited on this board: Haruki and Tavares 2025, Blind scoring of canopy photo quadrats, Marine Monitoring Methods 14, 55 to 74; Callaghan 2024, Depth stratified kelp loss on temperate reefs, Journal of Coastal Ecology 39, 288 to 309; Oyelaran 2026, Sea surface temperature thresholds for canopy kelp, Calderbay Marine Reports 2026-03.
Conclusion
Kelp canopy cover fell from 62% to 41% across sixteen fixed transects in five summers, with the loss concentrated between 2 and 6 metres, where cover fell 32 points, and the depth at which cover halves moved up by about 3 metres. Below 12 metres the same reef lost 6 points over the same five summers, so whatever is acting here is acting from the surface downward rather than across the reef as a whole.
Cover fell 62% to 41% across five consecutive summers
Shallow band lost 32 points, deep band lost 6
1,600 photo quadrats, scored blind to year
Days above the local stress threshold rose from 11 to 34

Block by block

What each block on the board is for, in the order a reader walks it.

Title band, three authors and a QR code
The title states the result and the effort: twenty one points of canopy in five summers, kelp cover at sixteen reef transects. Three authors carry superscripts over an institute and a monitoring programme, with the QR code at the right.
Abstract
Sixteen fixed transects surveyed by divers in five consecutive summers, twenty photo quadrats each per summer, 1,600 in total. Mean cover fell from 62% to 41%, the shallow band lost 32 points and the deep band 6, and fourteen of the sixteen transects fell.
Fixed transects, one method
The block explains what is held constant and what that costs: the same pins, window, frame, camera and scoring rule against a spatial coverage of sixteen transects on one 40 kilometre stretch. The trade buys a series where the fall cannot be a method artefact.
Methods as a labelled protocol
Five entries: sixteen permanent 50 metre transects at 2 to 18 metres relocated by GPS, twenty 0.25 square metre photo quadrats each summer, the same eight week window, a 100 point overlay scored blind to year, and the transect rather than the quadrat as the unit.
Key number and figure
A key number block reads 21 points of kelp canopy cover lost, with the detail line giving the 62% to 41% move, the sixteen transects and the 32 point shallow loss. The figure beside it plots the first and last summers as two bars.
Results
Yearly means of 62, 58, 51, 45 and 41 per cent, the fourteen transects that fell and the two deepest that did not, the three depth bands with their start and end figures, the inversion of the shallow and mid bands, and the quadrat level spread that sets the unit of analysis.
Drivers, limits and citations
Temperature days rose from 11 to 34 and the two worst years match the steepest falls, while urchin barrens on three transects did not. The board states that this design has no control coast and lists three cheap improvements, closing with three citations in the text.

What makes this board work

The method is held constant and says so

Same transects, same pins, same eight week window, same frame, same camera, same scoring rule, and a scorer blind to the year. A 21 point fall is only interesting once a reader can rule out the method changing under it.

The depth split is the finding

A shallow loss of 32 points against 6 below twelve metres, with the shallow band dropping under the mid band for the first time. The headline 21 point mean would have hidden a result that points directly at a surface driven mechanism.

Candidate drivers are ranked, not claimed

Temperature days rose from 11 to 34 and the two worst years match the two steepest falls, while urchin barrens on three transects fell no faster than their neighbours. The board states plainly that none of that is a test.

Questions people ask

What goes on an oceanography research poster?

The sites and how they are fixed, the survey method and its window, the sampling effort, the scoring rule and who applied it, the change with its depth or spatial structure, and the candidate drivers. Monitoring posters stand on method constancy, so say what was held fixed.

How do I show a five year series without five bars?

Give the full series in the results text and spend the figure on the endpoints. This board lists 62, 58, 51, 45 and 41 per cent in the text and plots the first and last summers, which keeps the axis to two labels that read at a metre.

Can a poster block sit on a dark card?

Yes for text, and this layout puts the results, discussion and conclusion on a dark foot card that reads well. Avoid putting a chart on a dark card, because the chart tick labels take the page text colour rather than the theme axis colour and can vanish.

What text size does a monitoring poster need?

Body text here is near 24 pixels on the 2340 by 1656 canvas, about 12 millimetres printed, readable at a metre. On a dark card the same size reads slightly smaller, so keep those blocks to the text that rewards standing closer.

How do I handle citations with no reference block?

This layout has no reference block, so the three citations sit at the end of the discussion text in full journal style. That is a legitimate fallback, and it is better than dropping the citations or shrinking a reference list into a margin.

How do I adapt this to my own transects?

Retype the title, abstract and five method entries, edit the figure categories and values, and rewrite the results and discussion text. The key number block takes a value, a label and a detail line, and the four checked points at the foot are a list component.

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Sources

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