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RANGE EXTENSION OF CUTLERIA HANCOCKII (CUTLERIALES; PHAEOPHYTA) TO THE SOUTHWESTERN GULF OF CALIFORNIA, MÉXICO

2000; Wiley; Volume: 36; Issue: s3 Linguagem: Inglês

10.1046/j.1529-8817.1999.00001-171.x

1529-8817

Rafael Riosmena‐Rodríguez, L. Paul‐Chávez, Gustavo Hinojosa‐Arango,

Botany, Ecology, and Taxonomy Studies

A range extension of Cutleria hancockii Dawson to the southern portion of the Gulf of California is presented based on collections in Concepción Bay, La Paz Bay and Muertos Bay between March, 1996 and May, 2000. Mature gametangial and sporangial plants were collected in several localities in the low intertidial zone and in subtidial areas. The present records represent a range extension of 500 km for the species with the new southern limit in Punta Perico in Los Muertos Bay. The plants mostly were observed in low intertidial‐shallow subtidial areas associated with Sargassum forest, but also were observed at depths of 30 ft. Based on analysis of the basic morphological and anatomial features of the plants, significant differences within geographic position and depth distribution were noted. Our data suggest that the temperature may be the determining factor in the distribution of this species.