Sea otter predation and the distribution of bivalve prey in the Elkhorn Slough National Estuarine Research Reserve

The California sea otter population is gradually expanding in size and geographic range and is consequently invading new feeding grounds, including bays and estuaries that are home to extensive populations of bivalve prey. One such area is the Elkhorn Slough, where otters have apparently established a spring and summer communal feeding and resting area. In anticipation of future otter foraging in the slough, an extensive baseline database on bivalve densities, size distributions, biomasses, and burrow depths has been established for three potential bivalve prey species, Saxidomus nuttalli, Tresus nutallii, and Zirphaea pilsbryi. In 1986, the Elkhorn Slough otters were foraging predominately at two areas immediately east and west of the Highway 1 bridge (Skipper's and the PG&E Outfall). Extensive subtidal populations of Saxidomus nuttalli and Tresus nuttallii occur in these areas. Shell records collected at these study areas indicated that sea otters were foraging selectively on Saxidomus over Tresus. The reason for this apparent preference was not clear. At the Skipper's study site, 51% of the shell record was composed of Saxidomus, yet this species accounted for only 16% of the in situ biomass, and only 39% of the available clams. Tresus represented 49% of the shell record at Skipper's, yet this species accounted for 84% of the in situ biomass and 61% of the available clams. There was no difference in mean burrow depth between the two species at this site so availability does not explain the disparity in consumption. At the PG&E Outfall, Saxidomus represents 66% of the in situ biomass and 81% of the available clams, while Tresus accounts for 34% of the in situ biomass and 19% of the available clams. Saxidomus accounts for 96% of the shell record at this site vs. 4% for Tresus, again indicating that the otters were preying on Saxidomus out of proportion to their density or biomass. High densities and biomasses of a third species, Zirphaea pilsbryi, occur in areas where sea otters were observed to be foraging, yet no cast-off Zirphaea shells were found. Although it is possible this species was not represented in the shell record because the otters were simply chewing up the shells, it is more likely this species is avoided by sea otters. There were relatively few sea otters in the Elkhorn Slough in 1986 compared to the previous two years. This, coupled with high bivalve densities, precluded any quantitative comparison of bivalve densities before and after the 1986 sea otter occupation. Qualitative observations made during the course of this study, and quantitative observations from previous studies indicate that, after 3 years, sea otters are not yet significantly affecting bivalve densities in the Elkhorn Slough.

Edwin B. Forsythe National Wildlife Refuge /

Includes location map (inset).

Pinelands National Reserve /

"*GPO:2008--339-126/80035."

Thomas Edison : Thomas Edison National Historical Park, New Jersey /

"*GPO:2008--339-126/80165."

National compensation survey.

Latest issue consulted: Jan. 2005, [Issued] Sept. 2005.

CHRONOMETRY OF LATE ENEOLITHIC AND ‘EARLY BRONZE’ CULTURES IN THE MIDDLE DNIESTER AREA: INVESTIGATIONS OF THE YAMPIL BARROW COMPLEX

The paper discusses the 2010-2015 studies of the radiocarbon chronology of Podolia ‘barrow cultures’ on the left bank of the middle dniester . The studies have relied on series of 14 C dates for the Klembivka 1, Pidlisivka 1, Porohy 3a and Prydnistryanske 1 sites determined in Kyiv and Poznań laboratories . They are the first attempt to construct a regional (‘Yampil’) radiocarbon scale for ‘Early Bronze’ funerary rites (4th/3rd-2nd millennium BC) as practised by barrow builders – the communities of the Tripolye and Yamnaya cultures – and the secondary barrow users – the designers of necropolises located on barrows – belonging to the Catacomb, Babyno and Noua cultures.

THE MIDDLE-DNIESTER CULTURAL CONTACT AREA OF EARLY METAL AGE SOCIETIES. THE FRONTIER OF PONTIC AND BALTIC DRAINAGE BASINS IN THE 4TH/3RD-2ND MILLENNIUM BC.

The paper discusses the taxonomy and autogenesis of the cycle of early ‘barrow cultures’ developed by the local communities of the middle Dniester Area or, in a broader comparative context, the north-western Black Sea Coast, in the 4th/3rd-2nd millennium BC . The purpose of the study is to conduct an analytical and conceptual entry point to the research questions of the dniester Contact area, specifically the contacts between autochthonous ‘late Eneolithic’ communities (Yamnaya, Catacomb and Babyno cultures) and incoming communities from the Baltic basin . The discussion of these cultures continues in other papers presented in this volume of Baltic-Pontic Studies.

‘YAMPIL INSPIRATIONS’: A STUDY OF THE DNIESTER CULTURAL CONTACT AREA AT THE FRONTIER OF PONTIC AND BALTIC DRAINAGE BASINS

The article presents the present state of research on the general issue of the dniester region of cultural contacts between communities settling the Baltic and Pontic drainage basins . Some five domains of research shall be brought to discussion in which it is possible to see fresh opportunities for archaeological study, on the basis of ‘Yampil studies’ on dniester-Podolia (forest-steppe) barrow-culture ceremonial centres from the latter half of the 4th millennium and first half of the 3rd millennium BC . This relates to the peoples of the Eneolithic and the Early Bronze age . in terms of topogenesis, embracing the Pontic-Tripolye, Yamnaya and Catacomb cultures, as well as Globular amphora and Corded ware in central prehistoric Europe .

National compensation survey.

Not distributed to depository libraries in a physical form, <2001->

National compensation survey.

Not distributed to depository libraries in a physical form, <2001->

National compensation survey.

Not distributed to depository libraries in a physical form, <2001->.

Entrepreneurship education in Portugal: 2004/2005 national survey

Education in entrepreneurship is a relatively new addition to the curriculum of institutions of higher education in Portugal. Forty-one percent of the current courses were first offered in 2003 or 2004. This recent awakening to the importance of entrepreneurship education is both reactive to the needs of the market as well as pro-active through the interests of professors. As the developing phenomenon of entrepreneurship education grows there is an urgent need to better understand and develop this area through academic research. Pedagogy, course content, the use of technology as well as other parallel initiatives related to entrepreneurship education in Portugal are the primary focus of this national survey of academic year 2004/2005. The majority (76.5%) of professors surveyed stated that their university has plans to create an entrepreneurship/innovation center. However, it is believed that roles and activities that a “center” must have to be effective are, as of yet, not well-defined in the Portuguese context. In developing future initiatives, Portugal could benefit by looking at models from other countries that have well-developed entrepreneurship educational offerings and support structures. Findings indicate that current course pedagogy in Portugal relies heavily on business plan creation and theoretical lectures and seldom makes use of computer business simulations, role-playing or internships. In addition, greater use of the Internet as a method for disseminating information to students and entrepreneurs could help “market” entrepreneurship education better and improve the perception of those students not currently taking an entrepreneurship course.

Olympic National Park, Washington /

Relief shown by shading and spot heights.

Development of site-specific sediment quality guidelines for North and South Atlantic littoral zones: Comparison against national and international sediment quality benchmarks

We aimed to develop site-specific sediment quality guidelines (SQGs) for two estuarine and port zones in Southeastern Brazil (Santos Estuarine System and Paranagua Estuarine System) and three in Southern Spain (Ria of Huelva, Bay of Cadiz, and Bay of Algeciras), and compare these values against national and traditionally used international benchmark values. Site-specific SQGs were derived based on sediment physical-chemical, toxicological, and benthic community data integrated through multivariate analysis. This technique allowed the identification of chemicals of concern and the establishment of effects range correlatively to individual concentrations of contaminants for each site of study. The results revealed that sediments from Santos channel, as well as inner portions of the SES, are considered highly polluted (exceeding SQGs-high) by metals, PAHs and PCBs. High pollution by PAHs and some metals was found in Sao Vicente channel. In PES, sediments from inner portions (proximities of the Ponta do Mix port's terminal and the Port of Paranagua) are highly polluted by metals and PAHs, including one zone inside the limits of an environmental protection area. In Gulf of Cadiz, SQGs exceedences were found in Ria of Huelva (all analysed metals and PAHs), in the surroundings of the Port of CAdiz (Bay of CAdiz) (metals), and in Bay of Algeciras (Ni and PAHs). The site-specific SQGs derived in this study are more restricted than national SQGs applied in Brazil and Spain, as well as international guidelines. This finding confirms the importance of the development of site-specific SQGs to support the characterisation of sediments and dredged material. The use of the same methodology to derive SQGs in Brazilian and Spanish port zones confirmed the applicability of this technique with an international scope and provided a harmonised methodology for site-specific SQGs derivation. (C) 2009 Elsevier B.V. All rights reserved.

Obstacle courses… nature, recreation, and health abstract

Obstacle courses are an activity that brings a group of people together, in which teams are organized to navigate an established route during a set period of time, completing tasks (clues, riddles, or challenges) to meet a defined goal.  Rules and safety norms are explained to all participants; however, they are not informed of the location of the clues, riddles, or challenges.  The following should be considered when organizing an obstacle course: objective, topic to be developed, location, materials needed, clues, riddles or challenges that may be included, and how to supervise that all teams pass the checkpoints.  Like any other activity with a touch of competitiveness, fair play and respect should be above any interest.  If, for any reason, any of the teams has an emergency, solidarity should prevail, and the activity can be used to teach values.  An adventurous spirit is also essential in this activity.  The desire for the unknown and the new challenges individuals and groups.  This activity helps groups of friends, children, adults, families, etc. share a nice and healthy day together in contact with nature, rescuing concepts such as cooperation, cleverness and, particularly, team work.