Copyright (c) 2013 Occidental College All rights reserved. http://scholar.oxy.edu/scas Recent documents in Bulletin of the Southern California Academy of Sciences en-us Thu, 23 May 2013 01:46:39 PDT 3600 http://scholar.oxy.edu/scas/vol98/iss2/1 http://scholar.oxy.edu/scas/vol98/iss2/1 Wed, 22 May 2013 13:18:09 PDT http://scholar.oxy.edu/scas/vol99/iss3/6 http://scholar.oxy.edu/scas/vol99/iss3/6 Wed, 22 May 2013 13:11:19 PDT Ricardo T. Pereyna et al. http://scholar.oxy.edu/scas/vol99/iss3/5 http://scholar.oxy.edu/scas/vol99/iss3/5 Wed, 22 May 2013 13:11:18 PDT The striped shore crab, Pachygrapsus crassipes, Hves in both protected embayments and exposed nearshore coastal habitats and larvae may develop in either setting. This study compared survivorship and development of Pachygrap- sus crassipes zoeae brooded in two southern California embayments and an ex- posed coastal habitat and cultured in corresponding waters under laboratory con- ditions. Larvae cultured in nearshore coastal seawater experienced higher survi- vorship during zoeal development, exhibited a higher percentage of stage VI zoeae surviving to the post-larval megalopal stage, and yielded a larger percentage of viable megalopae than larvae reared in seawater collected from either San Diego Bay or Mission Bay. This study suggests that brood site and culture water source will influence P. crassipes ' rate of development and survivorship.

]]> Claudio DiBacco http://scholar.oxy.edu/scas/vol99/iss3/4 http://scholar.oxy.edu/scas/vol99/iss3/4 Wed, 22 May 2013 13:11:16 PDT Prior to 1976 red tides of the dinoflagellate Lingulodinium polyedra usually developed during the fall of the year. From 1976 until 1994 there was an hiatus of red tide blooms. In the winter of 1995 an extensive red tide, dominated by L. polyedra, developed along the entire Southern California Bight. This new pattern of winter and spring red tides continued through 1996 and 1997. In ad- dition, a localized red tide persisted at the Los Angeles River mouth from winter through summer. During post-bloom conditions, L. polyedra cells were observed erupting from their cell walls, taking on a naked amoeboid form.

]]> Dominic E. Gregorio et al. http://scholar.oxy.edu/scas/vol99/iss3/3 http://scholar.oxy.edu/scas/vol99/iss3/3 Wed, 22 May 2013 13:11:15 PDT A twenty-year dataset on the subtidal benthic macrofauna within Mis- sion Bay, San Diego, reveals distinct differences in community structure along a back-bay/front-bay gradient. Assemblages in the extreme back bay are character- ized by low diversities and abundances, and are dominated by an exotic mussel, Musculista senhousia. Species richness increases toward the mouth, and because of the very high densities of M. senhousia at a station intermediate in the spatial gradient, total abundance and biomass show sharp peaks in this region. Despite the dramatically increased dominance M. senhousia has achieved in the bay, few negative effects of this invasion on subtidal macrofauna are evident.

]]> Deborah M. Dexter et al. http://scholar.oxy.edu/scas/vol99/iss3/2 http://scholar.oxy.edu/scas/vol99/iss3/2 Wed, 22 May 2013 13:11:14 PDT The delta of the Colorado River, praised for its wealth of wildlife, has been dramatically altered by agriculture. In this article we provide a basic over- view of the status of the aquatic wildlife of this area. Overall there is a great lack of knowledge on the status of the different aquatic species in the area, but negative impacts include the disappearance of the massive riparian forests, a reduction in the populations of native fish (very severe), a number of birds, two mammals, and possibly one amphibian and two reptiles. Conversely, habitat transformation might have benefited some amphibians, some birds, and one mammal. Alien aquatic taxa that have been introduced to the area or have colonized it include some plants, 4 invertebrates, more than 20 fish species, 3 amphibians, 3 reptiles, and 1 bird. We conclude that the area is far from being biologically intact, and that it does not meet the legal criteria for being a Biosphere Reserve, as it has been declared. Listing of some of the species as at risk is unsupported. Although the area is biologically very modified, it can provide important opportunities for the conservation of wetland taxa.

]]> E. Mellink et al. http://scholar.oxy.edu/scas/vol99/iss3/1 http://scholar.oxy.edu/scas/vol99/iss3/1 Wed, 22 May 2013 13:11:12 PDT http://scholar.oxy.edu/scas/vol99/iss2/6 http://scholar.oxy.edu/scas/vol99/iss2/6 Wed, 22 May 2013 11:42:15 PDT Jorge A. Rosales-Casian http://scholar.oxy.edu/scas/vol99/iss2/5 http://scholar.oxy.edu/scas/vol99/iss2/5 Wed, 22 May 2013 11:42:14 PDT Stephen R. Goldberg http://scholar.oxy.edu/scas/vol99/iss2/4 http://scholar.oxy.edu/scas/vol99/iss2/4 Wed, 22 May 2013 11:42:12 PDT Stephen R. Goldberg http://scholar.oxy.edu/scas/vol99/iss2/3 http://scholar.oxy.edu/scas/vol99/iss2/3 Wed, 22 May 2013 11:34:34 PDT Range extensions are presented for 14 symbiotic shrimp or obligate invertebrate predators that live with echinoderms, gorgonians, antipatharians or corals. Tulearocaris holthuisi Hipeau-Jacquotte, previously reported from the Indo-Pacific region, is reported for the first time from the eastern Pacific. Host records are given for the first time for Chacella tricornuta Hendrickx and Pseu- docoutierea elegans Holthuis. Harpiliopsis spinigera (Ortmann) co-occurs with H. depressa (Stimpson) in the eastern Pacific. The former has been considered to be a synonym of the latter, but they can be differentiated by morphology and living color. Like the Indo-Pacific region, the tropical eastern Pacific has shrimp that live among corals of the genus Pocillopora and on echinoids and starfishes. Unlike the Caribbean and western Atlantic, there are few species that associate with sea anemones, crinoids or sponges. Species of Chacella and Veleronia are endemic to the eastern Pacific.

]]> Mary K. Wicksten et al. http://scholar.oxy.edu/scas/vol99/iss2/2 http://scholar.oxy.edu/scas/vol99/iss2/2 Wed, 22 May 2013 11:34:33 PDT The ecological and distributional status of the continental fishes of northwestern Baja California, Mexico, was seasonally monitored between Feb- ruary 1996 and March 1997. A review of records in literature and of specimens collected between 1983 and 1995 in the study area, provide the data upon which this report is based. A total of 23 species (19 native and 4 exotic) belonging to 22 genera and 15 families was registered. This fish fauna is ecologically composed of species of marine derivation (78.9% sporadic and 21.1% diadromous) and by 8 permanent species (34.8%), 9 tidal visitors (39.1%) and 6 occasional visitors (26.1%). From the ichthyogeographical point of view, most of the species are of Calif omian affinity (68.4%) and the remaining related to northeastern Pacific (15.7%), Holarctic (5.3%) and circumtropical (5.3%) regions. Only one taxon {Oncorhynchus mykiss nelsoni) is endemic (5.3%) to the study region. Ten species are new continental records for Baja California [Norte], and seven taxa reach their southernmost continental ranges in northwestern Baja California. The conserva- tion status of Gasterosteus aculeatus microcephalus is considered as threatened. The main problem that affects the ecosystemic integrity of the streams of this region is the progressive alteration of the aquatic and riparian habitats caused by anthropogenic impact.

]]> Gorgonio Ruiz-Campos et al. http://scholar.oxy.edu/scas/vol99/iss2/1 http://scholar.oxy.edu/scas/vol99/iss2/1 Wed, 22 May 2013 11:34:31 PDT