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Full-Text Articles in Life Sciences

Developmental Mode In Opisthobranch Molluscs From The Northeast Pacific Ocean: Additional Species From Southern California And Supplemental Data, Jeffrey H. R. Goddard, Brenna Green Sep 2013

Developmental Mode In Opisthobranch Molluscs From The Northeast Pacific Ocean: Additional Species From Southern California And Supplemental Data, Jeffrey H. R. Goddard, Brenna Green

Bulletin of the Southern California Academy of Sciences

We document development type for 33 species of benthic opisthobranch gastropods – 15 for the first time – collected mainly from the Southern California Bight. Fourteen of the newly examined species had planktotrophic development, while the dorid nudibranch Atagema alba had capsular metamorphic development, the first example of direct development in a non-dendrodoridid nudibranch known from the northeast Pacific Ocean. For the remaining 18 species our new data are either consistent with earlier determinations of development type, or confirm previous inferences. The new data also broaden geographic coverage for some species, and for the sacoglossan Stiliger fuscovittatus and the nudibranch Melibe leonina ...


Recent Mass Mortality Of Strongylocentrotus Purpuratus (Echinodermata: Echinoidea) At Malibu And A Review Of Purple Sea Urchin Kills Elsewhere In California, Gordon Hendler Apr 2013

Recent Mass Mortality Of Strongylocentrotus Purpuratus (Echinodermata: Echinoidea) At Malibu And A Review Of Purple Sea Urchin Kills Elsewhere In California, Gordon Hendler

Bulletin of the Southern California Academy of Sciences

Mass mortalities of intertidal purple sea urchins, Strongylocentrotus purpuratus occurred at Malibu Lagoon State Beach, California, in 2010 and 2011. Both events followed the first heavy rain of the season, and coincided with an illegal breaching of the lagoon. Osmotic shock from low-salinity lagoon water, the likely cause of death, may have acted jointly with stress from exposure during especially low tides. Comparable die-offs of purple sea urchins have occurred at other localities after exposure to brackish water or thermal shock. Annually recurring lagoon ruptures at Malibu, combined with predation by western gulls, can have a profound impact on the ...


Genetic Structure Of Polycera Alabe And P. Atra (Mollusca: Opistobranchia: Nudibranchia) In The Pacific Coast Of North America, Monica Santander, Angel Valdes Jan 2013

Genetic Structure Of Polycera Alabe And P. Atra (Mollusca: Opistobranchia: Nudibranchia) In The Pacific Coast Of North America, Monica Santander, Angel Valdes

Bulletin of the Southern California Academy of Sciences

Polycera alabe and Polycera atra are closely related opisthobranch sea slugs found in coastal habitats along the eastern Pacific. Both species are extremely variable in external coloration and some of this variation appears to be correlated with geographic range. To determine the phylogenetic relationships and genetic structure of P. alabe and P. atra molecular phylogenies were generated using two genes: H3 (nuclear) and 16S (mitochondrial). Sequence data indicate that populations of P. atra are genetically homogeneous and lack geographic structure along the range of the species. In contrast, Polycera alabe consists of three previously unrecognized, distinct clades with overlapping ranges ...


Correction Of Locality Records For The Endangered Arroyo Toad (Anaxyrus Californicus) From The Desert Region Of Southern California, Edward L. Ervin, Kent R. Beaman, Robert N. Fisher Jan 2013

Correction Of Locality Records For The Endangered Arroyo Toad (Anaxyrus Californicus) From The Desert Region Of Southern California, Edward L. Ervin, Kent R. Beaman, Robert N. Fisher

Bulletin of the Southern California Academy of Sciences

The recovery strategy for an endangered species requires accurate knowledge of its distribution and geographic range. Although the best available information is used when developing a recovery plan, uncertainty often remains in regard to a species actual geographic extent. The arroyo toad (Anaxyrus californicus) occurs almost exclusively in coastal drainages, from Monterey County, California, south into northwestern Baja California, Mexico. Through field reconnaissance and the study of preserved museum specimens we determined that the four reported populations of the arroyo toad from the Sonoran Desert region of Riverside, San Diego, and Imperial counties, California are in error. Two additional sites ...


Distribution Of The Coast Horned Lizard, Phrynosoma Coronatum, In Southern California, Bayard H. Brattstrom Jan 2013

Distribution Of The Coast Horned Lizard, Phrynosoma Coronatum, In Southern California, Bayard H. Brattstrom

Bulletin of the Southern California Academy of Sciences

In order to access the endangered species status of any organism it is essential to know its past and present distribution. The Coast Lizard, Phrynosoma coronatum , was presumed to be threatened by habitat destruction due to human activities. I used historical literature and museum records to access past, and lizard survey teams to access current range and population numbers of P. coronatum in the five counties of Southern California between 1989-1991. The species occurs from sea level to 8,000’ (2440m) in a wide variety of habitats. Fieldwork and questionnaires increased by a third the number of locations (from 672 ...