Bulletin of the Southern California Academy of Sciences
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Open Access journal
ISSN (Print) 0038-3872
Published by Southern California Academy of Sciences [1 journal]
PubDate: Tue, 26 Jan 2016 14:37:57 PST
- A Flora of the Ballona Wetlands and Environs
Authors: Edith A. Read
Abstract: A list of vascular plant taxa is provided for a study area that encompasses the current Ballona Wetlands Ecological Reserve, Ballona Freshwater Wetlands, and areas that were part of the historic Ballona Wetlands and adjacent bluffs. The flora for this area has been documented in unpublished reports and voucher collections but not compiled into a single list. A total of 407 taxa comprise this flora, of which 40% are not indigenous to California. This percentage is higher than the percentage of non-indigenous species in California as a whole (17%). Out of 242 native species reported for the study area, 26 percent (62 species) have not been observed or collected since major hydrological alterations of the watershed began in the 1930s. Restoration planned for the Ballona Wetlands Ecological Reserve offers an opportunity to re-introduce some of the historically native flora, including rare and endangered species.
PubDate: Tue, 26 Jan 2016 14:37:55 PST
- The Bigeye Scad, Selar crumenophthalmus (Bloch, 1793) (Family Carangidae),
New to the California Marine Fauna, with a List to and Keys for All
Authors: Milton S. Love et al.
Abstract: We report on the collection of a Selar crumenophthalmus (Bloch, 1793), the bigeye scad. The fish was captured in the midwaters of a kelp bed (bottom depth 8 m) off northern Rancho Palos Verdes (33°48'N, 118°24'W), southern California. This is the first time this species has been reported from off California. The fish was one of approximately 10 conspecifics that were swimming with a school of juvenile jack mackerel, Trachurus symmetricus (Ayres, 1855). In addition to the report of this capture, we provide a list to and keys for all California carangids.
PubDate: Tue, 26 Jan 2016 14:37:52 PST
- Evidence for negative effects of drought on Baetis sp. (small minnow
mayfly) abundance in a southern California stream
Authors: Elizabeth A. Montgomery et al.
Abstract: Benthic macroinvertebrate (BMI) sampling was conducted at two sites in Topanga Creek from 2003-2014. During this period, Southern California experienced extreme drought conditions (US Drought Monitor 2014). Examining trends in species composition over this period allows for a relatively long-term analysis of potential effects of drought on BMI communities. The Southern California Coastal Index of Biotic Integrity (SCC-IBI; Ode 2007) was applied to BMI samples from Topanga Creek to measure the effects of drought on quantitative biotic integrity. The following trends regarding the BMI community of Topanga Creek emerged during the course of this study: 1) Wet year rainfall in Topanga Creek Watershed positively correlated to relative and per sq. ft. springtime abundance of Baetis sp., relative abundance of Simulium sp. up to 31” rain, and negatively correlated to relative abundnace of Chironomidae n.d., 2) percent algae cover in April and May positvely correlated to abundance per sq. ft. Baetis sp. and Simulium sp., and 3) multiple regression analysis revealed a negative relationship between Chironomid n.d. and Baetis sp. abundance. BMI are an important food source for endangered steelhead trout and other native aquatic and terrestrial insectivorous species of special concern; significant changes to the BMI community could have trophic reprecussions for these and other wildlife. Long-term monitoring is important for tracking the influence of changes in climatic conditions on BMI community.
PubDate: Tue, 26 Jan 2016 14:37:49 PST
- Comparison of the Marine Wood Borer Populations in Los Angeles Harbor in
1950-1951 with the Same Populations in 2013-2014
Authors: Donald J. Reish Dr. et al.
Abstract: A 14 month study was conducted of the marine wood borers present on monthly suspended wooden blocks at nine stations in Los Angeles Harbor in 2013-2014, and compared to the results of a marine borer study conducted in 1950-1951. Many environmental changes have occurred in the harbor over the past 60+ years. The harbor land mass of the outer harbor has been expanded towards the breakwater, channels were deepened, and the water quality improved as a result of pollution abatement. Existing pilings were removed, replaced or covered with two layers of polyethylene. The isopod Limnoria tripunctata and the pelecypod Lyrodus pedicellatus were the principal species and present at nearly all stations. Station C located in the Consolidated Slip area of the inner harbor was the site of 87 and 58 percent of the Limnoria and Lyrodus, respectively, counted during the study. Neither of these species was present at this station in 1950-1951. The dissolved oxygen concentration at this station improved from a mean of 0.1 ppm in 1950-1951 to a mean of 6.7 in 2013-2014 as a result of improved environmental conditions. Larval settlement at Station D numbered in the thousands in 1950-1951 but only 22 were counted during the 2013-2014 survey. This difference was attributed to the effect of piling covering or removal. It is recommended that existing creosoted pilings be covered or removed in the inner harbor area since this was the region of greatest occurrence of wood borers in 2013-2014.
PubDate: Tue, 26 Jan 2016 14:37:47 PST
- The Physical Characteristics of Nearshore Rocky Reefs in The Southern
Authors: Daniel Pondella II et al.
Abstract: We present a GIS method for mapping and characterizing nearshore reef habitats. Utilizing this technique, we were able to successfully map all nearshore (< 30 m depth) rocky reefs in the Southern California Bight and then quickly assess and characterize these data layers with expert opinion. The southern California coastline is 1198 km in length, with the eight Channel Islands and mainland comprising 503 km and 695 km of coastline, respectively. This is approximately the same amount of coastline as the rest of California. Within this region, we identified and characterized 122 natural reefs comprising 49,055 hectares, which is 26.6% of the 184,439 ha of nearshore habitat in the bight, the remainder comprised of soft bottom. Reefs varied appreciably in size ranging from 6 – 2498 ha. We sampled a subset of these reefs using a generalized random tessellation stratified design and quantified their physical characteristics as measured by scuba surveys. The reefs also varied with respect to habitat type and five distinct sub-habitat types varying from sheer oceanic pinnacle reefs to low-lying cobble were observed. The distribution of reef types varied between the mainland and islands. Island reefs were, in general, higher relief and had a greater percentage of rocky substrate. Mainland reefs generally had lower relief and a higher percentage of sand and cobble substrates.
PubDate: Tue, 26 Jan 2016 14:37:41 PST
- The Status of Two Geometrid Names
Authors: Carl W. Kirkwood
PubDate: Tue, 15 Dec 2015 13:36:34 PST
- Australian Leaf-Eating Ladybird Beetle Epilachna vigintioctopunctata
Fabr., as a Possible Agricultural Pest in the U.S.A (Notes on North
American Coleoptera, No. 3)
Authors: Charles S. Papp
PubDate: Tue, 15 Dec 2015 13:36:32 PST
- Notes on the Cicindela praetextata-californica Tiger Beetle Complex.
Description of a New Subspecies from Death Valley, California (Coleoptera
Authors: Norman L. Rumpp
PubDate: Tue, 15 Dec 2015 13:36:31 PST
- Scientific Notes
Authors: John A. Comstock
PubDate: Tue, 15 Dec 2015 13:36:30 PST
- An Undescribed Shore-Bug from Manitoba (Hemiptera, Saldidae)
Authors: Carl J. Drake
PubDate: Tue, 15 Dec 2015 13:36:29 PST
- The Act of Molting in the California Xanthidae, the Pebble Crabs
Authors: Jens W. Knudsen
PubDate: Tue, 15 Dec 2015 13:36:27 PST
- A New Genus of Dexaminid Amphipod (Marine Crustacea) from California
Authors: J. Laurens Barnard
PubDate: Tue, 15 Dec 2015 13:36:26 PST
- Notes on the Amphipod Genus Orchestoidea on the Pacific Coast of North
Authors: E. L. Bousfield
PubDate: Tue, 15 Dec 2015 13:36:25 PST
- On Cyclophorid Snail Shells and Opercula from Geurrero and Yucatan, Mexico
Authors: Robert J. Drake
PubDate: Tue, 15 Dec 2015 13:36:24 PST
- Descriptions of New Species of Marine Mollusks from West Mexico
Authors: Leo G. Hertlein
PubDate: Tue, 15 Dec 2015 13:36:23 PST
- Brief Notes on the Life Histories of Two Arizona Geometrid Moths
Authors: John A. Comstock
PubDate: Tue, 15 Dec 2015 13:36:17 PST
- A Delayed Skin Reaction to Conenose Bug Feeding on Man
Authors: Sherwin F. Wood
PubDate: Tue, 15 Dec 2015 13:36:16 PST
- The Prairie Rattlesnake at Gran Quivira National Monument, New Mexico
Authors: Channing T. Howell et al.
PubDate: Tue, 15 Dec 2015 13:36:14 PST