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A biological survey of Bahia de Las Angeles, Gulf of California, Mexico, II. Benthic polychaetous annelids

1968; Volume: 15; Linguagem: Inglês

10.5962/bhl.part.12054

0080-5947

Benthic Polychaetous, Annelids Donald, J Reish, Jose San, Kinberg Hartman, Espiritu Isla, Riojai Microphthalmus, Rioja, Topolobampo Pulmo, Oxydronms Brunnea, Hartman "', O Arenicolus Glabrus, Syllidia Liniata, Hartmann-Schroder Pilargidae, Ancistrosyllis Bassi, Loandalia Fanieli, Pilargh Hamatus, Hartman Syllidae, Moore Rioja, Paz La, Pionosyllis Gi, Sphaerosyllis Erinaceus, La Gulf, Neantbes, Leuckart Frey, Topolobampo Estero De Agiabampo, Nereis Gritbei kinberg, N Procera Ehlers, Ehlers Rata, Berkeley Berkeley, Isla, Espiritu Santo, Grube Riisei, Fauvel, Malmgren Zonata, Esteban San, M Sangumea, Montagu Hartman, Jorge Angel, M Stylobranchiata, Nicidhm Cariboea, Grube Hartman,

Marine Biology and Ecology Research

The benthic polychaetous annelids of Bahia de los Angeles were studied quantitatively in April 1962 and October 1963.Distribution and sediment preferences of the principal species are summarized.Of the 112 species encountered, ninety were previously unreported from the Gulf ol California.Six new species are described: Microphthalmus riojai, sp.n., Aricidea {Aricidea) rosea sp.n., Prionospio longibranchiata sp.n., Pectinaria (Pectinaria) hartmanae sp.n., Euchone barnardi sp.n., and Euchone cortezi sp.n.In April 1962, 3 9,470 specimens were collected; in October 1963, 7,100.The cause of this reduction is unknown, but high summer water temperatures may be involved.Previous reports of polychaetes from the Gulf of California are summarized.Resumen.Los Anelidos Poliquetos bentonicos de la Bahia de los Angeles fueron estudiados cuantitativamente durante Abril de 1962 y Octubre de 1963.Se detalla la distribucion de las especies principales, y las preferencias que presentan respecto a los distintos sedimentos.De las 112 especies registradas, solamente 22 han sido observadas previamente en el Golfo de California.Se incluye la descripcion de seis especies nuevas: Microphthalmus riojai sp.n., Aricidea (Aricidea) rosea sp.n.Prionospio longibranchiata sp.n., Pectinaria (Pectinaria) hartmanae sp.n., Euchone barnardi sp.n., y Euchone cortezi sp.n.En Abril de 1962 se obtuvieron 3 9,470 ejemplares, y solamente 7,100 en Octubre de 1963.Se desconocen los factores causantes de esta enorme diferencia numerica; sin embargo, se considera que las temperaturas elevadas registradas durante el verano, pudieron ejercer una definida influencia en ese fenomeno.Tambien se incluyen las observaciones previas correspondientes a los Poliquetos del Golfo de California.Early accounts of polychaetes from the Gulf of California have been summarized by Rioja (1941).Subsequent information has been added by Rioja (1943; 1947a, b), Hartman (1944a, 1950), Treadwell (1942), Fauvel (1943), Woodwick (1961), and Parker (1963).However, no quantitative studies have been made.Previous quantitative studies of eastern Pacific polychaetes by Reish (see references) have dealt with nearly all the principal bays from Morro Bay, in central California, south to Bahia de San Quintin, Baja California.This paper, which summarizes the quantitative data on the distribution of polychaetes in Bahia de los Angeles, a small bay on the west side of the Gulf of California, and compares the fauna ecologically and zoogeographically with that of similar areas in southern California, extends the area of quantitative studies into a geographically disjunct area.Preference for sand: