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Developing and understanding the biodegradation behavior of environmentally friendly alternatives, such as bioplastics, is therefore crucial to mitigate this problem. In this context, the degradation of PHBV-based biocomposites containing purified cellulose (TC), wood flour (WF), and almond shell (AS) fibers have been investigated and compared with neat PHBV in two Mediterranean marine locations\u2014a port and the open sea, within the same geographic region. Changes in weight, surface morphology, surface roughness, surface chemistry, and mechanical properties were monitored and periodically evaluated over 18\u00a0months of seawater exposure at the two sites. After 18\u00a0months of immersion, PHBV\/AS showed the highest disintegration degree (88% for 150\u00a0\u00b5m films and 33% for 500\u00a0\u00b5m sheets), with the port environment promoting up to a two- to three-fold higher biodegradation rate compared to the open sea. Additionally, mineralization was studied in lab-simulated marine conditions by tracking CO\n                    <jats:sub>2<\/jats:sub>\n                    release in order to study the actual effect of the fibers on the biodegradation rate of the PHBV. The research highlighted the significant influence of habitat-specific factors on biodegradation, with the port environment exhibiting a more pronounced impact on bacterial adhesion, weight loss, and the deterioration of mechanical properties compared to the open sea. Lignocellulosic fillers, regardless of type, promoted PHBV biodegradation in both conditions. In particular, PHBV\/AS exhibited the highest disintegration degree, followed by PHBV\/TC and PHBV\/WF. Fiber characteristics such as size, shape, and porosity predominantly governed biocomposite disintegrability. Almond shell was revealed as the most favorable fiber for PHBV biodegradation during mineralization test. Under laboratory-simulated marine conditions, the composites reached 50% mineralization between 55 and 70% faster than neat PHBV, confirming the accelerating effect of the fibers on the biodegradation kinetics. This study aims to shed light on the understanding of the biodegradation mechanism of biodegradable polymers and the effect of cellulosic fillers on this natural process. Additionally, the study includes tests and measurements of biodegradation under real conditions, which will provide further insights into the kinetics of this process. This knowledge is of interest for designing biodegradable products and predicting their biodegradation time.\n                  <\/jats:p>","DOI":"10.1007\/s10532-025-10231-4","type":"journal-article","created":{"date-parts":[[2025,12,9]],"date-time":"2025-12-09T14:17:13Z","timestamp":1765289833000},"update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":3,"title":["Biodegradation of PHBV-based biocomposites in two different marine environments of the Mediterranean Sea"],"prefix":"10.1007","volume":"37","author":[{"given":"Patricia","family":"Feijoo","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Anna","family":"Mar\u00edn","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Jos\u00e9","family":"Tena-Medialdea","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Jos\u00e9 Rafael","family":"Garc\u00eda-March","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Jos\u00e9","family":"G\u00e1mez-P\u00e9rez","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Luis","family":"Cabedo","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"297","published-online":{"date-parts":[[2025,12,9]]},"reference":[{"key":"10231_CR1","doi-asserted-by":"publisher","DOI":"10.3390\/polym14194140","author":"M Abbasi","year":"2022","unstructured":"Abbasi M, Pokhrel D, Coats ER, Guho NM, McDonald AG (2022) Effect of 3-hydroxyvalerate content on thermal, mechanical, and rheological properties of poly(3-hydroxybutyrate-co-3-hydroxyvalerate) biopolymers produced from fermented dairy manure. 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