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: Mon, 28 Sep 2015 07:51:24 PDT
- Food Selection of Coexisting Western Gray Squirrels and Eastern Fox
Squirrels in a Native California Botanic Garden in Claremont, California
Authors: Janel L. Ortiz et al.
Abstract: The Eastern Fox Squirrel (Sciurus niger) has been introduced to many areas within California. Over time, the fox squirrel has expanded its geographic range and has displaced the native Western Gray Squirrel (Sciurus griseus) in many urban/suburban habitats. Reasons for displacement could be similarities in habitat, space, and/or resource use by each species. A food preferences study was conducted in Claremont, CA at a native California botanic garden. Food items consumed by each species were recorded for one year. Species ate different food items with fox squirrels utilizing more natural foods totaling to 22 items. The gray squirrel utilized 18 food items with 11 of those overlapping with the fox squirrel. The fox squirrel also utilized several plant and tree species whereas the gray squirrel remained with only 3 plant/tree species yet consumed many different reproductive structures such as fruits, catkins, and buds. This study provides information on coexistence of gray and fox squirrels and potential reasons for gray squirrel displacement.
PubDate: Mon, 28 Sep 2015 07:51:22 PDT
- Asian Fish Tapeworm (Bothriocephalus acheilognathi) Infecting a Wild
Population of Convict Cichlid (Archocentrus nigrofasciatus) in
Authors: Victoria E. Matey et al.
Abstract: Abstract. — In September 2007 and May 2014, the Asian fish tapeworm, Bothriocephalus acheilognathi Yamaguti,1934 (Cestoda: Bothriocephalidea), was found in populations of the non-native convict cichlid (Archocentrus nigrofasciatus) and mosquitofish (Gambusia affinis) collected from the discharge channel of a water treatment plant in Los Angeles County. Prevalence and mean intensity of infection of 450 convict cichlids and 70 mosquitofish were 55.3%/9.3 and 11%/1.4, respectively. Overall prevalence and mean intensity of infection in the convict cichlid was higher in 2007 (92%/12.3) than in 2014 (37%/5.4). In 2007, parameters of infection were size-dependent. The highest prevalence/mean intensity of infection was revealed in small fish (100%/15.5) and the lowest in large fish (66.7%/1.5). No statistically significant differences in infection parameters were found in convict cichlids of different size classes in 2014. This paper provides the first documented record of the Asian fish tapeworm infecting a wild population of the convict cichlid in the U.S.
PubDate: Mon, 28 Sep 2015 07:51:21 PDT
- Salt Marsh Reduces Fecal Indicator Bacteria Input to Coastal Waters in
Authors: Monique Myers et al.
Abstract: We investigated fecal indicator bacteria (FIB) concentrations in water and sediment from Carpinteria Salt Marsh, a medium-sized (93 ha), mostly natural southern California coastal wetland. High FIB concentrations, exceeding recreational water quality standards, were found at inlet sites after winter storm events and during a summer dry weather sampling event. Runoff entering the wetland had the highest concentrations of FIB after large rain events and after rain events following extended periods without rain. The watersheds with the greatest agricultural and urban development draining into the wetland generally contributed the highest loads of FIB, while the largest and least developed watershed contributed the lowest FIB concentrations. Surface water exiting the wetland at the ocean contained relatively low concentrations of FIB and only exceeded recreational water quality standards after the largest rain event of the year. Bacterial concentrations in sediment were only elevated after rain events, suggesting wetland sediment was not a reservoir for bacteria. Our results provide evidence that moderate-sized tidal wetlands at the base of moderately urbanized watersheds can attenuate FIB, improving coastal water quality.
PubDate: Mon, 28 Sep 2015 07:51:19 PDT
- Effects of Ocean Recreational Users on Bottlenose Dolphins (Tursiops
truncatus) in the Santa Monica Bay, California
Authors: Amber D. Fandel et al.
Abstract: Coastal bottlenose dolphins (Tursiops truncatus) have been observed in proximity to swimmers, kayakers, stand-up paddle boarders and surfers along near-shore corridors in the Santa Monica Bay, California. From 1997 to 2012, a total of 220 coastal boat-based focal follows of dolphin schools were conducted in this area to determine a) the type and proximity of encounters between ocean recreational users and coastal dolphins, and b) the effects of these encounters on bottlenose dolphins’ behavior. The majority of encounters involved dolphins and surfers (77.93%, n=145 encounters), and overall, neutral reactions were observed in response to encounters (61.93%, n=176 behavioral responses). Interactions between bottlenose dolphins and recreational users were recorded only once, and changes in dolphin behavior were observed more frequently when recreational users were at distances of less than three meters from a school. Although the current impact of human activities on coastal bottlenose dolphin behavior does not appear to be significant in the Santa Monica Bay, there is a need to: 1) adopt a precautionary approach in view of the increasing presence of ocean recreational users along this coastline, and 2) regularly monitor these encounters to determine potential changes in the type and proximity of encounters, as well as changes in dolphin behavioral responses
PubDate: Mon, 28 Sep 2015 07:51:17 PDT
- Mammal Trackways from the Barstow Formation, California
Authors: Raymond M. Alf
PubDate: Fri, 18 Sep 2015 11:51:12 PDT
- A Study of the Zygopinae (Coleoptera: Curculionidae) of America North of
Authors: Elbert L. Sleeper
PubDate: Fri, 18 Sep 2015 11:49:20 PDT
- Notes on the Ova of Six California Moths
Authors: John Adams Comstock
PubDate: Fri, 18 Sep 2015 11:49:19 PDT
- Contributions from the Los Angeles Museum-Channel Islands Biological
Survey 37. Brachydont Desmostylian from Miocene of San Clemente Island,
Authors: Edw. D. Mitchell Jr.
PubDate: Fri, 18 Sep 2015 11:49:18 PDT
- Birds and Indians in the West
Authors: Loye Miller
PubDate: Fri, 18 Sep 2015 11:49:17 PDT
- The Number of Conenose Bugs, Triatoma, Infected by One Engorgement on a
Mouse with Trypanosoma Cruzi
Authors: Sherwin F. Wood
PubDate: Fri, 18 Sep 2015 11:49:15 PDT
- An Experimental Study of the Echolocation Ability of a California Sea
Lion, Zalophus californianus (Lesson)
Authors: William E. Evans et al.
PubDate: Fri, 18 Sep 2015 11:49:14 PDT
PubDate: Fri, 18 Sep 2015 11:49:13 PDT
- New Information on the Structure of Permian Lepospondylous Vertebrate-
from an Unusual Source
Authors: Peter Paul Vaughn
PubDate: Fri, 18 Sep 2015 11:49:08 PDT
- New Species of Hyperodes Jekel and a Key to the Nearctic Species of the
Genus. (Coleoptera: Curculionidae)
Authors: William D. Stockton
PubDate: Fri, 18 Sep 2015 11:49:07 PDT
- Comparison of Boccardia columbiana Berkeley and Boccardia proboscidea
Hartman (Annelida, Polychaeta)
Authors: Keith H. Woodwick
PubDate: Fri, 18 Sep 2015 11:49:06 PDT
- Notes on the Barnacle Lepas fascicularis Found Attached to the Jellyfish
Authors: Jens W. Knudsen
PubDate: Fri, 18 Sep 2015 11:49:05 PDT
- Attraction of Insects to Exudates of Verbesina encelioides and IV A
Authors: E. G. Linsley et al.
PubDate: Fri, 18 Sep 2015 11:48:59 PDT
- Molluscs from Pacific Northwest Archaeological Sites, 2. Washington:
45-CA-30, a Coastal Shellmidden in the Ozette Area
Authors: Robert J. Drake
PubDate: Fri, 18 Sep 2015 11:48:58 PDT
- Surf-Riding by the California Gray Whale
Authors: David K. Caldwell et al.
PubDate: Fri, 18 Sep 2015 11:48:57 PDT