> ## Content Index
> Fetch the complete content index at: https://intelligence.wildlandseco.com/llms.txt
> Use this file to discover other available public pages before exploring further.

# Madeira marina monitoring shows a long accumulation of introduced species
- URL: https://intelligence.wildlandseco.com/2026-11-02-madeira-marinas-decadal-invasion-accumulation/
- Published: 2026-11-02T15:31:03.000Z
- Updated: 2026-11-02T15:31:03.000Z
- Description: Eleven years of surveys distinguished seasonal richness peaks from continued non-native species buildup.
- Author: Benjamin Worlund
- Tags: Oceans, Wildlife, Governance, #ecological-intelligence, #brief-2026-11-02, #priority-read, #peer-reviewed, #geo-europe

Evidence

Peer-reviewed

Geography

Four marinas, Madeira Archipelago, Portugal

System

Marine marinas; biofouling; non-indigenous species

## WHAT THE EVIDENCE SAYS

Four marinas yielded 71 taxa across 33 surveys and 131 sampling events during 2013–2025\. Cumulative non-indigenous richness climbed to 27–30 species per marina, representing 45–48% of recorded fouling species. Warm-period survey richness differed from cooler-season multi-year assemblage turnover.

## WHY IT MATTERS / OUR READ

A marina is an ongoing biological introduction interface, not an event that can be assessed from one annual inspection.

## CAVEATS / UNCERTAINTY

Recorded taxa do not by themselves quantify offshore ecological harm or distinguish all independent introduction routes. Peer-reviewed accepted version released 2 November; final layout pending.

## SOURCE

Scientific Reports — Ramalhosa et al. (2 Nov 2026; accepted early version)  
[View original evidence ↗](https://doi.org/10.1038/s41598-026-75432-0?ref=intelligence.wildlandseco.com)

From the Morning Brief · 2026-11-02

[Read the full Morning Brief →](https://intelligence.wildlandseco.com/morning-brief-2026-11-02/)