Relationship Between Sea Surface Temperature, Weather Events, and Location and the Morphology of Ceratodictyon (Lomentariaceae, Rhodophyta) on Primarily Mexican Pacific-Based Herbarium Data
2025
Nataly Quiroz-González | Luz Elena Mateo-Cid | Angela Catalina Mendoza-González | Luis Gabriel Aguilar-Estrada | Bernardo Córdova-Cárdenas | Oscar Ochoa-Rodríguez
Temperature affects the morphology, physiology, and distribution of marine macroalgae, as supported by studies that used long-term data from herbaria. In the present study, sea surface temperature (SST), latitudinal distribution, and La Niñ:a or El Niñ:o years were correlated to the morphology of two macroalgal species of the Mexican Pacific: Ceratodictyon tenue and C. variabile. Twenty-four morphological characteristics were evaluated, and 95 samples from 1965 to 2013 in the Escuela Nacional de Ciencias Bioló:gicas herbarium were reviewed. In 2017, 2023, and 2024, 12 specimens were sampled at three locations. Low positive correlations were found between thallus diameter and SST for C. tenue, while low positive correlations were detected for thallus length and medullary cell diameter vs. SST and medullary cell length vs. year for C. variabile. Significant relationships were found between the thallus length and cortical cell diameter of C. variabile with latitude and SST. It is concluded that SST contributes to changes in morphology, but is not the only factor that affects them. For the first time in a tropical area, the present study explores whether there is a relationship between SST, latitudinal distribution, and El Niñ:o and La Niñ:a years and the morphology of a genus of red algae.
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