Bulletin (Southern California Academy of Sciences) articles from August 2002

Bulletin (Southern California Academy of Sciences) archives from August 2002

Structure and standing stock of the fish assemblages of San Diego Bay, California from 1994 to 1999.(Statistical Data Included)
August 1, 2002... Abstract.--Twenty quarterly samples were taken of the fish assemblages of San Diego Bay from July 1994 to April 1999. Each quarter, four stations were occupied using a variety of sampling methods (large seine, small seines, square enclosure,...

An evaluation of the distribution and abundance of Common Ravens at Joshua Tree National Park.(Statistical Data Included)
August 1, 2002... Abstract. -- We located and evaluated data from the past 100 years to assess the historical and contemporary abundance and distribution of Common Ravens (Corvus corax) at and near Joshua Tree National Park in southern California. We found...

Student award winners at 2002 Annual Meeting.
August 1, 2002... At the 2002 Annual Meeting, held June 7-8 at Claremont McKenna College, Claremont, California, the following student papers and posters won awards. Awarded by the American Institute of Fishery Research Biologists Best Paper Daniel...

Sediment Toxicity in the Southern California Bight: 1998 regional monitoring. (Abstracts).(Brief Article)
August 1, 2002... Sediment from 303 sites on the continental shelf between Point Conception, California, and the United States-Mexico international border was sampled in 1998 using a stratified random design. Toxicity was evaluated using three methods: amphipod...

Identification of contaminated sediments in the So. Calif. Bight using a biomarker assay (RGS; EPA Method 4425). (Abstracts).(Brief Article)
August 1, 2002... Samples from Bight '98 were extracted at the SCCWRP laboratory and extracts from 267 stations were sent to Columbia Analytical Services for testing with the human reporter gene system (HRGS), now called EPA method 4425. Small amounts (2-20: L)...

The spatial distribution of sediment contamination in the Southern California Bight. (Abstracts).(Brief Article)
August 1, 2002... The results from the sediment chemistry analyses performed as part of the 1998 Regional Marine Monitoring Study are presented. A total of 361 samples of surface sediments (0-2 cm) were collected; including 290 stations in United States waters...

A historical view of marine sediment contamination surveys in Southern California from 1977 to 1998. (Abstracts).(Brief Article)
August 1, 2002... Selected stations from the near-coastal marine sediments of Southern California were surveyed periodically for trace contaminant levels in 1977, 1985, 1990, 1994, and 1998 as part of the Southern California Coastal Water Research Project's...

Mussel Mania: longterm contaminant trends in the Southern California Bight. (Abstracts).(Brief Article)
August 1, 2002... Twenty one of the over 260 inter-tidal NOAA National Mussel Watch stations are located in the Southern California Bight and most are located adjacent to regional monitoring grids. Mussels have been collected and analyzed annually or biennially...

A review of the kelp beds of Orange and San Diego Counties and their response to El Ninos and La Ninas from 1967 to 2001. (Abstracts).(Brief Article)
August 1, 2002... In 1985, the San Diego Regional Water Quality Control Board (Board) stipulated in permits it issued that kelp beds near each major discharger into the Pacific Ocean be photographed annually by means of vertical and aerial infrared photography,...

Large scale oceanographic studies of the continental shelf of the Southern California Bight: the example of Bight 98 and future approaches. (Abstracts).(Brief Article)
August 1, 2002... Stormwater runoff, sewage discharge, aeolian input, and other sources contribute to the contamination of our coastal waters in the Southern California Bight. The Water Quality Group of the Bight 98 project undertook the task of examining the...

A half century of physical and biological oceanography in the Southern California Bight with emphasis on fish species, temperature and zooplankton. (Abstracts).(Brief Article)
August 1, 2002... The California Cooperative Fisheries Investigations sea surveys have collected, identified, and curated fish larvae from 40,000 quantitative ichthyoplankton samples. The majority of the common fishes represented as larvae in the CalCOFI...

Assessment of demersal fish and invertebrate assemblages on the Southern California shelf in 1998. (Abstracts).(Brief Article)
August 1, 2002... A regional synoptic survey of demersal fish and invertebrates was conducted in 1998 on the continental shelf of the mainland (including bays) and islands of southern California. The objective of this study was to assess the status and health of...

Pah exposure and DNA damage in flatfish from Southern California Bays and Harbors, and Channel Islands. (Abstracts).(Brief Article)
August 1, 2002... Two species of flatfish from southern California were evaluated for exposure to polynuclear aromatic hydrocarbons (PAHs), and DNA damage. California halibut (Paralichthys californicus) were collected from eight bays and harbors (Ventura Harbor,...

Ports of Long Beach and Los Angeles biological monitoring of San Pedro Bay. (Abstracts).(Brief Article)
August 1, 2002... Comprehensive surveys of Long Beach and Los Angeles Harbors in San Pedro Bay were conducted in the year 2000. These surveys represent the first harbor-wide examination of biological resources since the extensive studies of the 1970s. The...

Soft-bottom benthic invertebrate assemblages of the Southern California Bight. (Abstracts).(Brief Article)
August 1, 2002... We identified benthic assemblages and their associated habitat differences using data from 278 uncontaminated sites sampled in the Southern California Bight in 1998. Previously, two open coastal assemblages were identified from 1994 regional...

Diversity-abundance relationships in benthic habitats of the Southern California Bight. (Abstracts).(Brief Article)
August 1, 2002... For a comparison of benthic diversity-abundance relationships in three soft-bottom habitats, 321 samples were collected at random from southern California embayments, the coastal shelf and Channel Islands. Diversity was highest in the Channel...

How important are nonindigenous species to the benthos of Southern California embayments? (Abstracts).(Brief Article)
August 1, 2002... As part of the Bight '98 Regional Monitoring Program, 113 benthic samples were collected in southern California embayments to assess the prevalence and evaluate the effects of nonindigenous species. We found that nonindigenous species were...

Marine-the multi-agency rocky intertidal network. (Abstracts).(Brief Article)
August 1, 2002... Regional, long-term monitoring programs provide data needed by a wide range of groups from the public and private sector. Coordinated programs provide the added benefits of a diversified funding source, better coordination among field...

Post-restoration long-term monitoring for the Batiquitos Lagoon enhangement project. (Abstracts).(Brief Article)
August 1, 2002... Batiquitos Lagoon, a 234ha. closed, eutrophic lagoon in Carlsbad California was restored through a management partnership between the Port of Los Angeles and City of Carlsbad. Since the December 1996 opening of the restored lagoon to tidal....

Atmospheric deposition of trace metals to Santa Monica Bay. (Abstracts).(Brief Article)
August 1, 2002... There are numerous sources that contribute pollutants to Santa Monica Bay. Some sources (i.e. POTWs) are well-characterized and inputs to the Bay are well-known. Other sources, such as atmospheric deposition, have not been well-characterized...

Characteristics, formation mechanisms and chemical composition of ultrafine particles in various locations of the Los Angeles Basin. (Abstracts).(Brief Article)
August 1, 2002... Ultrafine particulate matter (PM) consists of particles mostly emitted by combustion sources as well as formed during gas-to-particle formation processes in the atmosphere. Various studies have shown these particles to be particularly toxic....

Autotomy: novel protection from mercury toxicity in aquatic oligochaete worms. (Abstracts).(Brief Article)
August 1, 2002... Aquatic oligochaete worms are commonly used as tools in toxicity testing as well as in sediment's health assessments. Oligochaete worms are generally considered pollution tolerant, but little research has been made to help us understand the...

Equal loads of nutrients administered to macroalgae via pulses of differing frequency and magnitude affect growth and tissue nutrients of Enteromorpha interstinalis and Ulva expansa. (Abstracts).(Brief Article)
August 1, 2002... Macroalgae such as Enteromorpha intestinalis and Ulva expansa are highly successful in estuarine systems, in which nutrient inputs can range from chronic, daily loads to episodic pulses. We investigated the effect of the timing of nitrogen (N)...

Morphological variation and patterns of reproduction and recruitment in lower intertidal populations of the kelp Egregia menziesii (Turner) areschoug. (Abstracts).(Brief Article)
August 1, 2002... Egregia menziesii (O. Laminariales) is an important habitat-structuring component of shallow, benthic communities throughout central and southern California. Morphological variation in this species is high, particularly in the lateral blades...

Habitat associations of steelhead trout in a small stream near the Southern extent of their range. (Abstract).(Brief Article)
August 1, 2002... Habitat associations of steelhead trout Oncorhynchus mykiss are generally well known for populations in northern territories, but nearly nothing has been documented concerning habitat associations of steelhead in southern landscapes. I assessed...

In situ monitoring of gastric pH changes associated with feeding in leopard sharks. (Abstracts).(Brief Article)
August 1, 2002... Surprisingly little is known about feeding periodicity in sharks. We monitored changes in gastric pH as a possible indicator of feeding in leopard sharks (Triakis semifasciata). An adult leopard shark was fed a pressure insensitive pH probe...

Ontogenetic responses to terrestrial diets in a neotropical fish: gut morphology and digestive enzyme activity in Brycon guatemalensis (Characidae). (Abstracts).(Brief Article)
August 1, 2002... The characid fish Brycon guatemalensis consumes insects as juveniles and fruits and leaves as adults. Gut structure and function may be expected to change with this ontogenetic shift from carnivory to herbivory. So, we compared gut length (in...

Diel movement patterns of the ocean sunfish, Mola mola: a preliminary report. (Abstracts).(Brief Article)
August 1, 2002... We used temperature and depth-sensing acoustic transmitters to track the movements of four ocean sunfish near Catalina Island, California. We tracked fish continuously for 24-48 h periods, and concurrently deployed a CTD every 90 minutes to...

Incidence of Salmonella in free ranging iguanid lizards of Southern California. (Abstracts).(Brief Article)
August 1, 2002... Considerable study has been devoted to investigating the incidence of Salmonella in the gut of captive reptiles, however limited data are available for free ranging populations. This study investigated the frequency of Salmonella in cloacal...

Oil impact on growth of Salicornia virginia under controlled tidal conditions. (Abstracts).(Brief Article)
August 1, 2002... Salicornia virginica is a slow growing salt marsh plant species that grows at the lower marsh elevations. In a greenhouse experiment, S. virginica plants were exposed to an oil treatment of 2 L/[m.sup.2] in a microcosm that included a tidal...

Examination of recruitment patterns in kelpbass, Paralabrax clathratus, by the analysis of mitochondrial DNA control region sequences. (Abstracts).(Brief Article)
August 1, 2002... Potential benefits of marine protected areas (MPA) include increased biomass, species diversity, and enhanced recruitment to the MPA and to adjacent non-protected areas. Whereas MPAs can increase biomass and species diversity within their...

Behavioral responses of scalloped hammerhead sharks, Sphyrna lewini, and leopard sharks, Triakis semifasciata, to pulsed, direct current electrical fields. (Abstracts).(Brief Article)
August 1, 2002... Electrical shark deterrents might be a less harmful way to protect people and equipment than meshing beaches or fishing for sharks. The use of strong electrical fields as a shark deterrent has shown promise, but has been poorly documented....

Phylogeny and biogeography of the serannid fish genus Epinephelus. (Abstracts).(Brief Article)
August 1, 2002... The genus Epinephelus is comprised of 99 species of perciform fishes commonly known as groupers. This large and diverse group of fishes is distributed in tropical and sub-tropical waters worldwide. Although being recognized in the taxonomic...

Fish species composition from the Seafood Market of Ensenada, Baja California, Mexico (2000-2001). (Abstract).(Brief Article)
August 1, 2002... From October 2000 to September 2001 we study the specific composition of commercialized fish species in the Seafood Market of Ensenada, Baja California, Mexico. Our objectives were to determine the fish species, the number of individuals, the...

Polychaetous annelid assemblages associated with sediments near seven shallow wastewater outfalls along the Tijuana-Ensenada costal corridor in Northern Baja California, Mexico. (Abstracts).(Brief Article)
August 1, 2002... In July 2001, 21 benthic stations were sampled at depths between 5 and 13m, ranging from Tijuana to Punta Banda, Baja California, Mexico. The aim of this study was to describe the species distribution and structure of the polychaete communities...

Population systematics of the Carolina anole, Anolis carolinensis voigt (Iguanidae: Polychrotinae): geographic variation in morphology. (Abstracts).(Brief Article)
August 1, 2002... The Carolina or green anole, Anolis carolinensis, has an extensive range throughout the Coastal Plain and contiguous regions of the southeastern United States. A considerable amount of morphological variation has been reported for this species...

Salt tolerance and remediation potential of Salix lasiolepis: a native California willow. (Abstracts).(Brief Article)
August 1, 2002... Urbanization and agricultural practices have increased salinity levels in many S. California rivers/streams. Increased salinity levels may limit the success of trees commonly used to remediate degraded wetlands and riparian areas. We are...

Northern Orange County fall 2001 weather summary. (Astracts).(Brief Article)
August 1, 2002... This poster displays the fall 2001 maximum and minimum daily air temperatures and the monthly average maximum air temperatures recorded at Yorba Linda, California, for the years 1988 through 2001. Also shown are the fall 2001 monthly surface...

Trophic levels and heavy metal concentrations of Terns at two California nesting colonies. (Abstracts).(Brief Article)
August 1, 2002... We determined the stable carbon and nitrogen isotope values and heavy metal concentrations for Caspian Tern (Sterna caspia), Elegant Tern (Sterna elegans) and Forster's Tern (Sterna forsteri) and their fish prey at the Bolsa Chica Ecological...

Acanthochondria sp. A, a new species of parasitic copepod (Poecilos-Tomatoida: Chondracanthidae) on the California halibut, Paralichthys californicus, from Santa Monica Bay, California. (Abstracts).(Brief Article)
August 1, 2002... A new species of parasitic copepod, Acanthochondria sp. A, is described from the California halibut, Paralichthys californicus (Ayers), collected from Santa Monica Bay, California. A total of 7 nono-vigerous and 22 ovigerous females (each...

Parasite-mediated sexuel selection of Green Swordtails, Xiphophorus helleri. (Abstracts).(Abstract)
August 1, 2002... Hamilton and Zuk (1982) introduced the concept of parasite-mediated sexual selection using the "good gene" theory, proposing that females preferred males with more pronounced secondary sexual characteristics because they were indicators of...

The benthic community of San Diego Bay. (Abstracts).(Abstract)
August 1, 2002... Benthic infauna and sediment samples were collected at 46 stations in San Diego Bay, California as part of the coastal ecology component of the Southern California Bight 1998 Regional Monitoring Survey (Bight '98). All stations were selected...

Probable laterite in the Paleocene Las Virgenes Sandstone, solstice canyon, Santa Monica Mountains, California. (Abstracts).(Abstract)
August 1, 2002... A nine-meter thick Paleocene paleosol present in the Las Virgenes Sandstone, Santa Monica Mountains, California, probably represents an ancient soil formed in a tropical climate. The paleosol is interbedded with sandstones and mudstones...

Assessment of the health of kelp habitats along the north coast of Santa Monica Bay. (Abstracts).(Abstract)
August 1, 2002... The distribution and abundance of kelp forests flanking Santa Monica Bay are spatially and temporally patchy, especially along Malibu, and have shown a decline over the past 20 years. To assess the health of kelp habitats, a suite of physical...

Soil microbial activity and mycorrhizal associations in a Southern Californian salt marsh. (Abstracts).(Abstract)
August 1, 2002... Traditionally, wetland restoration projects have focused on restoring the natural vegetation and hydrology of the ecosystem. However, often overlooked are the subsurface soil components of the system that are crucial to nutrient cycling, as...

Occurrence of Gyrodactylus perforatus (Monogenea) on its fish host Clevelandia IOS (Gobiidae) from Bodega Bay and Tomales Bay, California. (Abstracts).(Abstract)
August 1, 2002... The monogenetic trematode Gyrodactylus perforarus was previously reported to infect populations of the arrow goby, Clevelandia ios, from Bodega Bay, California. Clevelandia ios were sampled from Bodega Bay and nearby Tomales Bay using two...

Management of the California Least Tern breeding population. (Abstracts).(Abstract)
August 1, 2002... The California Least Tern (Sterna antillarum browni) breeds from April through August at nesting areas along the coast from the San Francisco Bay, California to lower Baja California, Mexico. Prior to its listing as endangered under both the...

Conservation of the endangered Southern California Steelhead in the Ventura River: an update on the proposed removal of Matilija Dam. (Abstracts).(Abstract)
August 1, 2002... In 1997, the National Marine Fisheries Service added the Southern California Steelhead (Oncorhynchus mykiss) to the endangered species list. It is estimated that annual steelhead runs in southern California streams declined from 55,000 to less...

Conservation dilemmas involving endangered species in three Southern California habitats: San Miguel Island, Bolsa Chica wetlands and Riparian Woodlands. (Abstracts).(Abstract)
August 1, 2002... Protection of endangered species often leads to policies that may cause problems for other species, or require habitat manipulation. Three examples of this are presented. Reintroduction of bald eagles to the northern Channel Islands may harm...

The importance of management of the native parasitic plant Cuscuta salina in Southern California salt marsh habitat. (Abstracts).(Abstract)
August 1, 2002... The disappearing coastal salt marsh habitat of California has a small number of native, specialized plant species, which include a native plant parasite, alkali dodder (Cuscut salina). Though little is known about the ecology of parasitic...

Avian populations in diminishing open space: a survey of the birds of Signal Hill, CA. (Abstracts).(Brief Article)
August 1, 2002... It is the nature of environments to change. Entire epochs of our earth's history are marked by massive, and sometimes devastating, environmental changes. Modern society often brings about rapid change, and the urbanization of our landscape has...

Are Southern California's changing coastal waters and nearshore biological communities becoming more susceptible to invasion by exotic sea weeds? (Abstracts).
August 1, 2002... Evidence suggests that invasive species may impose increasing threats to biodiversity because of global change. For example, increased sea temperatures can alter the distributions of marine species, and make northern regions more susceptible to...

What is nonindigenous and is it all bad? (Abstracts).(Brief Article)
August 1, 2002... The present symposium and numerous publications document the negative ecological impacts and economic costs associated with the numerous nonindigenous forms of many taxa that have been introduced around the world. The normally accepted...

The marine invaders of California: lessons from San Francisco and San Diego. (Abstracts).(Brief Article)
August 1, 2002... Invasions of exotic species continue to alter the structure and functioning of ecosystems worldwide, and the coastal embayments of California now harbor a wide variety of introduced plants and animals. While San Francisco Bay has a...

U.S. response to potential ecological threat to Southern California ecosystems by the introduced Marine Chlorophyte Caulerpa taxifolia. (Abstracts).(Brief Article)
August 1, 2002... In 2000, the invasive strain of the seeweed Caulerpa taxifolia was documented at two southern California sites. A clone of this strain inadvertently introduced into the Mediterranean in the 1980's is reported to currently blanket over 13,000h...

Exotic aquatic turtles on the west coast: considerations and implications. (Abstracts).(Brief Article)
August 1, 2002... In the states of California, Oregon, and Washington, at least 27 species of exotic (non-native) aquatic or semi-aquatic turtles from 20 genera and 5 different families have been recovered or reliably reported from within the range of 3 native...

Exotic fish species and their impacts on small coastal lagoons in Southern California. (Abstracts).(Brief Article)
August 1, 2002... Both freshwater and estuarine exotic (non-native) fish species impact small souther California coastal lagoons. In the seven small lagoons (0.5-50 hectares) on Marine Corps Base Camp Pendleton, the larger of these lagoons are more impacted by...

Invader in the open sea! The New Zealand marine snail Philine auriformis in Southern California coastal waters. (Abstracts).(Brief Article)
August 1, 2002... Sometime in late 1994 Philine auriformis, a clam predator from New Zealand, first appeared in Southern California Bight (SCB) coastal waters. This is one of a few documented introductions to shelf communities; most exotic species are reported...

Interaction netween native fish, habitat, and exotic fish species in the middle Santa Ana River, Southern California. (Abstracts).(Brief Article)
August 1, 2002... Two native fish species, Santa Ana sucker and arroyo chub, occur in about 55 km of the middle Santa Ana River. The upstream 9 km with higher gradient, rocky and gravelly, substrate, and artificially fluctuating flow supports populations of each...

Monitoring of nearshore marine habitats following beach replenishment activities. (Abstracts).(Brief Article)
August 1, 2002... The San Diego Regional Beach Sand Project dredged just over two million cubic yards of sand from four offshore borrow sites and replenished 12 beaches along the coast of San Diego County from Oceanside to Imperial Beach. Surveys conducted...

Analysis of aerial photographs to determine the effects of the Diablo Canyon Power Plant thermal discharge on kelp canopies. (Abstracts).(Brief Article)
August 1, 2002... We analyzed aerial photographs taken in summer/fall of 1969-91 and 1997-98 to determine the effects of the Diablo Canyon Power Plant thermal discharge on the surface canopies of giant kelp, Macrocystis, and bull kelp, Nereocystis. During each...

Interpreting historical records of sizes of kelp beds. (Abstracts).(Brief Article)
August 1, 2002... Many of the 24 kelp (Macrocystis) beds of San Diego and Orange Counties appear to have been nutrient-limited during most of the past two decades, based on canopy histories as determined by aerial photography. Frequent occurrences of...

Update on the San Clemente Artificial Reef program. (Abstracts).(Brief Article)
August 1, 2002... The second year of monitoring the 22.4-acre San Clemente Kelp Experimental Artificial Reef (SCAR) has been completed. This study is directed by the California Coastal Commission, conducted mainly by the Marine Science Institute of the...

Reef-a volunteer fish monitoring program in California. (Abstracts).(Brief Article)
August 1, 2002... The REEF Fish Survey Project is a volunteer fish-monitoring program developed by the Reef Environmental Education Foundation (REEF). REEF volunteers collect marine fish distribution and abundance data using a standardized visual method during...

Long-term changes in fish populations in the vicinity of Diablo Canyon Power Plant, Central California. (Abstracts).(Brief Article)
August 1, 2002... The Diablo Canyon Power Plant is a 2200 MW nuclear facility located midway along a 20 km (12 mi) reach of rocky coastline in central California. We studied the effects of heated seawater from the cooling water discharge on fish populations in...

Declines in rocky reef fish populations: have different species responded similarly to environmental change? (Abstracts).(Brief Article)
August 1, 2002... There is compelling evidence that the abundances of many coastal species off southern California have undergone dramatic declines over the past two decades concurrent with declines in productivity. The decline in productivity represents a...

Longterm decline of ichthyoplankton abundance in Santa Monica Bay. (Abstracts).(Brief Article)
August 1, 2002... From 1974 to the present, the Vantuna Research Group at Occidental College has monitored the ichthyoplankton of King Harbor, Redondo Beach. Ichthyoplankton tows have been conducted monthly during this period. This database enables us to infer...

Regime Shifts in California current zooplankton assemblages. (Abstracts).(Brief Article)
August 1, 2002... The CalCOFI zooplankton time series extends from 1949 to present, providing an unprecedented opportunity to assess long-term variability in North Pacific pelagic assemblages and the links of such variations to climatic forcing. Although El...

Monitoring subtidal community changes at Survey Rock, Anacapa Island: forty years and still counting. (Abstracts).(Brief Article)
August 1, 2002... In the early 1960s, Neushul et al. studied the distribution of organisms on the south side of East Anacapa Island, CA. Their 3-year study mapped the occurrences of common macroinvertebrate and kelp species from the lower limits of the...

The nearshore fish assemblage of the San Diego/La Jolla Ecological Reserve. (Abstracts).(Brief Article)
August 1, 2002... Marine reserves such as the San Diego-La Jolla Ecological Reserve (SDLJER) are quickly becoming a primary tool in the management of coastal marine ecosystems in California. The San Diego-La Jolla Ecological Reserve was proposed in 1961 and...

Remote tracking of giant sea bass (Stereolepis Gigas) using an acoustic sensory array around Anacapa Island. (Abstracts).(Abstract)
August 1, 2002... It is thought that giant sea bass form a spawning aggregation at Anacapa Island during summer months. Attempts to observe and document this event using traditional underwater monitoring and observation techniques have not been entirely...

Sexual dichromatism and spawning behavior of the kelp bass, Paralabrax clathratus, from Santa Catalina Island, California. (Abstracts).(Abstract)
August 1, 2002... The kelp bass, Paralabrax clathratus, is a common nearshore reef fish of the Southern California Bight, being abundant on both the mainland and the Channel Islands. Although the biology of kelp bass has been well studied, aspects concerning its...

Reproductive behavior and mating system of the temperate wrasse, Halichoeres semicinctus. (Abstracts).(Abstract)
August 1, 2002... The reproductive biology of the southern California labrid fishes has been studied extensively in the past and has led to further study of their behavior and ecology. The reproductive behavior and mating system of the rock wrasse (Halichoeres...

Putative function of Tyrosine D of photosystem II probed by fluorescence and optical absorbance spectroscopy. (Abstracts).(Abstract)
August 1, 2002... Photosystem II of the photosynthetic light reactions contains two redox-active tyrosine residues ([Y.sub.z] and [Y.sub.D]). Tyrosine [Y.sub.z] shuttles electrons from the Mn cluster of the oxygen evolving complex to the oxidized reaction center...

Field validation of chronic sublethal dredged material laboratory bioassays: program design. (Abstracts).(Abstract)
August 1, 2002... Federal regulations require the evaluation of potential dredged material for unacceptable environmental effects prior to disposal. Standard evaluation of dredged material includes measuring acute toxicity in benthic organisms over a ten day...

Flower density effects on pollination of artichoke thistle (Cynara Cardunculus L. Asteraceae). (Abstracts).(Abstract)
August 1, 2002... Pollination studies of non-native plant species are few. Cynara cardunculus is a non-native, invasive weed of lower elevation coastal regions in central and southern California. Due to the large size and showy appearance of its inflorescence,...

Copper tolerance and remediation potential of Salix lasiolepis: a native California willow. (Abstracts).(Abstract)(Statistical Data Included)
August 1, 2002... Urbanization, manufacturing and agricultural practices have increased copper in many S. California rivers/streams, making it an important waterway contaminant. Increased copper levels may limit success of trees commonly used to remediate...

What does it take to be a herbivore?-gut structure and function in three species of new world silverside fishes (Telostei: Atherinopsidae) with different Diets. (Abstracts).(Abstract)
August 1, 2002... We explored the possible diet-related specializations of the gut in stomachless fishes by comparing the brush-border surface areas and enterocyte inclusions (in progress) of the gut epithelium and the digestive enzyme profiles (in progress) in...

Feeding preferences and assimilation efficiencies in the herbivorous marine snail Lithopoma undosum (Turbinidae). (Abstracts).(Abstract)
August 1, 2002... Many studies have examined factors that contribute to food choice in herbivorous marine invertebrates. However, few have considered relationships between preferences and the assimilation efficiencies of food items. The purpose of this research...

Whence have they come, the abyssal grenadiers? (Abstracts).(Abstract)
August 1, 2002... Truly abyssal species of the grenadier genus Coryphaenoides are relatively few, represented in the eastern North Pacific Ocean only by Coryphaenoides (Nematonurus) armatus variabilis (Gunther), Coryphaenoides (Nematonurus) yaquinae Iwamoto and...

Physiological responses to variations in salinity and nutrients by the bloom-forming macroalga Enteromorpha intestinalis: implications for use as a bioindicator of freshwater and nutrient influx to estuarine and coastal areas. (Abstracts).(Brief Article)
August 1, 2002... Enteromorpha intestinalis is a bloom-forming species of macroalgae associated with eutrophication. The objective of this study was to quantify the response of E. intestinalis to two factors that co-occur with eutrophication, salinity reduction...

The use of aquatic invertebrates to identify ecological trends in urban freshwater streams. (Abstracts).(Brief Article)
August 1, 2002... As urban development in Southern California progresses, watershed management issues become increasingly important. Recognition of the effects of non-point source pollution and physical degradation to freshwater streams and drainages can be...

Comparison of feeding guild structures of intertidal fishes from California and Chile: a measure of community convergence. (Abstracts).(Brief Article)
August 1, 2002... Spatially separated intertidal fish communities in similar environments may face the same selection pressures. The intertidal fish community of central California is represented mainly by cottids and zoarcoids, while the intertidal fishes of...

Digestive enzyme activity in herbivorous and carnivorous prickle-back fishes (Stichaeidae): ontogenetic and phylogenetic effects. (Abstracts).(Brief Article)
August 1, 2002... We measured the activities of proteases and carbohydrases in four closely related species of pricklebacks to determine whether these fishes are genetically predisposed to digest a specific diet. Both Cebidichthys violaceus and Xiphister mucosus...