Bulletin of the Southern California Academy of Sciences
Open Access journal
ISSN (Print) 0038-3872
Published by Southern California Academy of Sciences [1 journal]
PubDate: Tue, 03 Feb 2015 13:58:02 PST
- Clarifying the Northern Extent of Diamond Stingray (Dasyatis dipterura) in
Authors: Eric Miller et al.
PubDate: Tue, 03 Feb 2015 13:58:00 PST
- Fishes of Marine Protected Areas Near La Jolla, California
Authors: Philip A. Hastings et al.
Abstract: Abstract.—The marine waters surrounding La Jolla, California have a diverse array of habitats and include several marine protected areas (MPAs). We compiled a list of the fish species occurring in the vicinity based on records of specimens archived in the Marine Vertebrate Collection (MVC) of the Scripps Institution of Oceanography (SIO). Collection of fishes from La Jolla in the MVC started in 1905, but greatly accelerated in 1944 when Carl L. Hubbs moved to SIO. By 1964, 90% of the 265 species recorded from the area had been collected and archived in the MVC. The fishes of La Jolla are dominated by species whose center of distribution is north of Point Conception (111 species), or between there and Punta Eugenia (96), with fewer species with southern distributions (57), and one exotic species. Reflecting the diversity of habitats in the area, soft-substrate species number 135, pelagic species 63, canyon-dwelling species 123 (including 35 rockfish species of the genus Sebastes), and hard-bottom species 140. We quantified the abundance of the latter group between 2002 and 2005 by counting visible fishes in transects along the rocky coastline of La Jolla, both within and adjacent to one of the region's MPAs. In 500 transects, we counted over 90,000 fishes representing 51 species. The fish communities inside and outside of the MPA were similar and, typical of southern California kelp forests, numerically dominated by Blacksmith, Chromis punctipinnis (Pomacentridae), and Señorita, Oxyjulis californica (Labridae). Natural history collections such as the MVC are important resources for conservation biology for determining the faunal composition of MPAs and surrounding habitats, and documenting both the disappearance and invasion of species.
PubDate: Tue, 03 Feb 2015 13:57:58 PST
- Avian Predators Target Nocturnal Runs of the Beach-Spawning Marine Fish,
California Grunion, Leuresthes tenuis (Atherinopsidae)
Authors: Karen L M Martin et al.
Abstract: Tidal cycles are important cues for many marine and near-shore animals. Birds that typically feed at the water’s edge during daytime low tides are rarely present on beaches at night. However, we found that several species of diurnal birds reliably attended and preyed upon the nocturnal spawning runs of a marine fish, Leuresthes tenuis, the California Grunion (Teleostei: Atheriopsidae) on the shores of Malibu Lagoon State Beach (MLSB), Los Angeles County, California, USA. Avian hunters of California Grunion included Black-crowned Night Heron Nycticorax nycticorax, Great Blue Heron Ardea herodias, Snowy Egret Egretta thula, and Western Gull Larus occidentalis. Spawning runs of California Grunion are synchronized by tides within a narrow window of time, two hours following the semilunar high tides of full and new moons. These silverside fish aggregate en masse predictably, and further increase their vulnerability by fully emerging from the water while spawning. This allows the birds to capture California Grunion terrestrially. On nights when spawning runs of California Grunion could potentially occur, birds were present on MLSB, often before the fish began to run onto shore. Number of birds was high for the nights of likely runs whether after full or new moons, whether or not the fish appeared, but not on other nights. We suggest that birds rely on tidal cues to anticipate spawning runs of California Grunion, not the amount of moonlight or the actual presence of fish on shore. Shorebirds were more likely to forage at night at sites close to their upland roosting and nesting areas than at sites with less upland habitat. Observers on nearby Will Rogers State Beach and Topanga State Beach saw comparable spawning runs of California Grunion but reported significantly fewer avian predators. At MLSB, when tide conditions were right, avian predators appeared on the beach with even greater predictability than did their potential prey.
PubDate: Tue, 03 Feb 2015 13:57:54 PST
- Pilot California Spiny Lobster Postlarvae Sampling Program: Collector
Authors: Eric Miller
PubDate: Tue, 03 Feb 2015 13:57:53 PST
- Male Mating Posture and Breeding Coloration of the Temperate Marine
Tubesnout Aulorhynchus flavidus
Authors: Michael J. Schram et al.
Abstract: Body posture, vocalizations or coloration play variable roles in the mating success and social dominance of species. Increasing our knowledge of how these specific features function helps improve our understanding of evolutionary trends and the ecological associations of species with their habitats. Through observations and still photography of the temperate marine tubesnout Aulorhynchus flavidus in display at the Aquarium of the Pacific in Long Beach, California during early May, 2013 we documented male mating behavior, a previously uncharacterized aspect of this species. Males position their body in a declined position from tail to head facing a prospective female, undulating their bright red pelvic fins for courtship display. Although male pelvic fins appear to be red year-round, their vibrancy seems to increase during peak breeding. Male heads are dark blue to black with a prominent iridescent blue patch on the snout and similar patches down the length of the body in contrast to females that are a drab brown throughout. While bright colors are often uncommon in temperate systems, it is present in other temperate gasteriform fishes suggesting red coloration may have developed in a common ancestor and has persisted over time. However, research has shown variable success relative to body coloration in other gasteriform species under interspecific competition for nesting space. These results may suggest variable selective pressures for body coloration under differing habitat conditions and may result in fluctuating prominence over evolutionary time.
PubDate: Tue, 03 Feb 2015 13:57:51 PST
- Larval Duration, Settlement, and Larval Growth Rates of the Endangered
Tidewater Goby (Eucyclogobius newberryi) and the Arrow Goby (Clevelandia
ios) (Pisces, Teleostei)
Authors: Brenton T. Spies et al.
Abstract: The early life history of the federally endangered tidewater goby (Eucyclogobius newberryi) and its sister species the arrow goby (Clevelandia ios) has been poorly documented to date. Both are endemic to estuarine habitats throughout the California coast, however, habitat use differs between these two species. The arrow goby is commonly found in fully marine tidal bays and mudflats. The tidewater goby, however, prefers lagoons with some degree of seasonal isolation from the sea. Here, we used otoliths to examine the larval duration, size at settlement, and growth rates of newly settled gobies collected from 18 estuaries in California. The tidewater goby had a larval duration that was ~2 days shorter than the arrow goby (23.95 vs. 26.11 days, respectively), but a larger size at settlement based on back-calculated size (12.38 vs. 10.00 mm SL) due to a faster larval growth rate (2.86 vs. 2.60 μm/day-1). There are several reasons that could explain these differences in larval traits, such as differences in temperature or food resources between the two estuary types, or the faster, annual life cycle of the tidewater goby relative to the arrow goby.
PubDate: Tue, 03 Feb 2015 13:57:49 PST
- Expansion of the non-native Mississippi Silverside, Menidia audens
(Pisces, Atherinopsidae), into fresh and marine waters of coastal southern
Authors: Camm C. Swift et al.
Abstract: Abstract--Mississippi Silversides, Menidia audens, were first recorded in southern California reservoirs and nearby outflows in the late 1980s and early 1990s. In 1997-2000 they were taken in King Harbor, Redondo Beach,and in 2000 in the Santa Ana River. By 2005-2006 they were found in several other coastal drainages from the San Gabriel River in Orange and Los Angeles counties northward to Arroyo Burro, Santa Barbara County. Initial invasion was via the California Aqueduct in the late 1980s and early 1990s and more recently dispersal has taken place along the southern California coast. The records from King Harbor occurred for a relatively short period, mid-1997-mid-2000 (mostly 1997 and 1998) before they were established in coastal drainages. Their impact on native species is not known but on some occasions Mississippi Silversides have outnumbered native Topsmelt, Atherinops affinis, in small coastal lagoons estuaries. Mississippi Silversides are known to prey on eggs and larvae of other fishes and could be increasing predation on small native animals as well as serving as prey for larger piscivores like steelhead and terns. .
PubDate: Tue, 03 Feb 2015 13:57:46 PST
- Notes on Euphoria fascifera (Leconte) (Coleoptera: Scarabaeidae) in
Authors: E. L. Sleeper et al.
PubDate: Thu, 22 Jan 2015 10:10:26 PST
- Notes on Atractocerus brasiliensis Lepeltier & Serville (Coleoptera:
Telegusidae) in Western Mexico
Authors: Elbert L. Sleeper
PubDate: Thu, 22 Jan 2015 10:10:25 PST
- Notes on the Biology of Blepharocera micheneri and Philorus yosemite
(Diptera: Blepharoceridae) in Southern California
Authors: David L. Gibo
PubDate: Thu, 22 Jan 2015 10:10:23 PST
- Observations of the Mating Process of the Spider Crab Pugettia producta
Authors: Jens W. Knudsen
PubDate: Thu, 22 Jan 2015 10:10:22 PST
- First Record of the Extinct Shark, Squalicorax falcatus, from California
Authors: Sheldon P. Applegate
PubDate: Thu, 22 Jan 2015 10:10:22 PST
- Description of a New Genus for Ommatopteryx virescens (Hulst)
(Lepidoptera: Pyraustidae, Glaphyriinae)
Authors: Hahn W. Capps
PubDate: Thu, 22 Jan 2015 10:10:20 PST
- The Northern Yellow Bat in Sinaloa, Mexico
Authors: Richard B. Loomis et al.
PubDate: Thu, 22 Jan 2015 10:10:19 PST
- A Fossil Owl from Santa Rosa Island, California with Comments on the Eared
Owls of Rancho La Brea
Authors: Hildegarde Howard
PubDate: Thu, 22 Jan 2015 10:05:16 PST
- The Southern Yellow Bat in Joshua Tree National Monument, California
Authors: Richard B. Loomis et al.
PubDate: Thu, 22 Jan 2015 10:00:23 PST
- Contributions from the Los Angeles Museum - Channel Islands Biological
Survey 38. Diptera from San Nicolas Island and Point Mugu, California
Authors: Robert R. Sanders
PubDate: Thu, 22 Jan 2015 10:00:22 PST
- Experimental Studies on Factors Involved in Care-Giving Behavior in Three
Species of the Cetacean Family Delphinidae
Authors: Melba C. Caldwell et al.
PubDate: Thu, 22 Jan 2015 10:00:21 PST
- A Preliminary Report on a Miocene Flora from the Barstow Formation,
Authors: Raymond M. Alf
PubDate: Tue, 13 Jan 2015 16:07:55 PST