48,794 research outputs found
Results of the 1976 southern California pismo clam census
A Pismo clam, Tivela stultorum, census was conducted
in January 1976 on selected southern California beaches.
Effort and catch information was collected through
clamer interviews. Estimates for January 17 on beaches
sampled were 3,296 clammer-hours, 2,170 clammers, and
10,739 legal clams (4.5 inches or larger) harvested.
Clams were collected for age and growth studies.
Samples of clams from the Long Beach to Newport Beach pier
area demonstrate the fastest growth rates of any Pismo
clams reported in the literature. Clams begin to be recruited to the fishery at age 40 months. (14pp.)
The 1974 year class was the largest on beaches
sampled. Recruitment to the fishery will be poor for the
1976-77 and 1977-78 seasons and clamming will be dependent
on large older clams
Pismo clams and sea otters
Sea otter foraging along Monterey Bay beaches and at Atascadero State Beach has precluded recreational Pismo clam fisheries at six major clamming beaches. Outside the sea otter's foraging range Pismo clam stocks are yielding good catches; apparently the stringent controls on the recreational fishery is adequate to maintain the State's Pismo clam stocks. Clammer interviews at Orange and Los Angeles County beaches and at beaches near Pismo Beach and Morro Bay and in Monterey Bay revealed the clam stocks to be on a healthy, sustainable yield basis. Exceptionally
large numbers of small 1.5 to 3.5 inch Pismo clams were reported at all clam beaches surveyed north of Pt. Conception indicating good year class survival in recent years. Sea otters forage dense Pismo clam beds by moving along a "front", progressively foraging from one beach to the next, reducing the clams to low levels before moving on. Some sea otters continue to forage throughout the areas previously depleted by the larger aggregate moving northward, thus the large numbers of sublegal clams
in the 1.5 to 3.5 inch size group in these intertidal and shallow subtidal areas are not expected to reach legal size in numbers sufficient to develop a recreational fishery. In Monterey Bay about 60,000 Pismo clams were removed or killed by human activity in the April 1974 to March 1975 period. A rough estimate of the Pismo clams consumed by sea otters during this same period in Monterey Bay is over 500,000 clams. (51pp.
Results of the 1977 southern California pismo clam survey
A Pismo clam, Tivela stultorum, survey was conducted
in January 1977 on selected southern California beaches.
Effort and catch information was collected through clammer interviews. Estimates for the two day survey were 1,596
clammers spending 2,506 hours to take 6,139 clams. Comparisons were made between the 1977 survey results and
previous surveys.
Clams were collected for length and age studies. Compliance
to the 4.5-inch (114.3 mm) minimum size limit appeared to be good. (15pp.
Review of Dysmorphoptilidae Handlirsch (Hemiptera: Cicadomorpha) from the Argentinean Triassic, with description of a new subfamily, and a new species
This contribution presents new fossil insect taxa of the order Hemiptera (Cicadomorpha, Dysmorphoptilidae, Gallegomorphoptilinae subfam. n.) from the Ischichuca Formation (late Middle Triassic to early Late Triassic) from La Rioja Province (Argentina). One subfamily, one new species, and three new combinations, are proposed: Gallegomorphoptila kotejai sp. n., G. acostai comb. n., G. gigantea comb. n., G. pulcherrima comb. n. Also, a wide review of the family Dysmorphoptilidae HANDLIRSCH (diverse and well represented in the Argentinean Triassic levels), is madeFil: Martins-Neto, R.G.. Universidade Federal de Juiz de Fora, Minas Gerais; BrasilFil: Gallego, Oscar Florencio. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Nordeste. Centro de Ecología Aplicada del Litoral. Universidad Nacional del Nordeste. Centro de Ecología Aplicada del Litoral; Argentin
O pismu ugarsko-hrvatske kraljice Elizabete (Zadar, 3. studenoga 1383)
Autor u radu upozorava na potrebu opreznoga pristupa dokumentima iz poljičke povijesti koji su prepisani i objavljeni u pojedinim časopisima ili radovima. U prilog tomu navodi nekoliko primjera. Primjećuje nadalje da je ugarsko-hrvatska kraljica Elizabeta, supruga Ludovika Anžuvinca, napisala u Zadru pismo hrvatskomu banu 3. studenoga 1383., a ne 3. studenoga 1333., kako se u historiografiji uglavnom navodi. To pismo se drži jednim od važnijih dokumenata iz poljičke povijest.
Possessive Adjectives Formed from Personal Names in Polish Translations of the New Testament
The study focused on possessive adjectives derived by means of the suffixes -ow(y), -in, -sk- formed from proper personal names in old and contemporary translations of the New Testament.
Adjectival derivatives have been excerpted from 15 full and 6 incomplete translations of the New Testament, which date back to the 16th, 17th and 20th century. These translations differ in methods of
translation (loose and word-for-word; philological, interlinear, ecumenical, dynamic and artistic)
and its basis (Greek original or Latin Vulgate). The comparative analysis of old and contemporary
translations shows that possessive adjectives, though used frequently in former times, are now going out of use and the substantival genitival attribute is taking their place. This phenomenon is reflected in processes linked with the development of the Polish language. Moreover, tracking the use of the type of adjectives analysed can be used to distinguish various methods of translation. The use of possessive adjectives in contemporary texts suggests respect for the tradition of translation, whereas the failure to use them – the modernization of Polish
The accentuation of neuter nouns in Slovene and West Bulgarian
The Slovene neo-circumflex is our major source of information for the reconstruction of Proto-Slavic long vowels in posttonic syllables (cf. Kortlandt 1976)
Reproduction, body condition, age, and growth of a large sandy intertidal bivalve, Tivela stultorum
The iconic Pismo clam Tivela stultorum (Mawe, 1823) once supported a thriving commercial and recreational fishery in California, but populations have declined statewide in recent decades, in part due to overfishing. To manage and restore populations, fishery managers need accurate life history information, but critical data on reproductive cycles, maturity, and growth rates is either unknown or many decades old. This project aimed to (1) determine annual reproductive cycles and body condition of Pismo clams; (2) identify environmental drivers of reproduction and body condition; (3) determine size-age relationships among clams in California; and (4) estimate growth rates. Up to 70 clams mo-1 were collected from Pismo Beach, CA, for histological analysis to determine reproductive stage, measure a body condition index, and estimate ages from shells. Additional clams and shells were collected from sites north and south of Point Conception to compare growth and age at legal size between these 2 major oceanographic zones. Data suggests that reproductive timing deviates only slightly from historical records, with clams spawning later in the year than decades ago. Body condition indices correlate with reproductive stage 3 Ripe, providing an inexpensive proxy to monitor Pismo clam reproduction. Growth was faster in warmer Southern California compared to Central California, but still substantially slower than historical estimates; we estimate that Pismo clams reach the current legal size (114 mm) in 11.1 yr, several years later than previous estimates. Collectively, these data are critical to improve and guide management decisions for this once-abundant species
Size and Abundance of Pismo Clams in the Intertidal and Subtidal
Pismo clams, Tivela stultorum, were observed at Rincon Beach, CA to find patterns of abundance and size distribution along a depth gradient from the intertidal, where recreational clammers have access on foot, to the subtidal, where clammers only have access with more specialized snorkeling or SCUBA equipment. Size and abundance patterns were compared between the intertidal and subtidal regions. A heuristic model was created to predict the effects of predation and wave action on clam density. Clam abundance was significantly greater in the intertidal than the subtidal and displayed a Gaussian distribution across the entire distance sampled. While Pismo clam abundance was greater in the intertidal region, the mean clam size was significantly greater in the subtidal region. Moreover there was no difference in the distribution of sublegal clams between regions. However, there were significantly more legal sized clams in the subtidal than the intertidal. Our results suggest that recreational fishing pressure and exposure to the wash zone, in addition to other factors, influence the distribution of clams at Rincon Beach, CA. Further elucidating the patterns and mechanisms contributing to the distribution trends of the Pismo clam could aid in overall population estimates and the future management of the Pismo clam fishery
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