ix, 55 p. : ill., maps. A print copy of this thesis is available through the UO Libraries. Search the library catalog for the location and call number. / Aggressive behaviors in many animals increase juvenile survival and reproductive success. I explored the role of aggressive behavior in maternal care and male-male competition in caprellid amphipods. Attacks of females in three reproductive states toward male and female conspecific and congeneric caprellids were quantified. Parental females showed greatest aggression toward males of both species, suggesting these caprellids may pose threats to juveniles. Paired males were exposed to females in three reproductive states and other males and fought most often in the presence of nonbrooding females. This finding suggests that males recognize and fight over receptive females. Males fight with the second gnathopods and "poison tooth," which may cause fatalities in conflicts. Mortality rates of males with and without (removed) poison teeth were not significantly different, but the highest observed mortality rate was no-tooth caprellids when paired with toothed males, suggesting presence of the teeth may impact the outcome of male-male conflicts.

Typescript. Includes vita and abstract. Bibliography: Includes bibliographical references (leaves 94-98). Description: vii, 98 leaves : ill. ; 29 cm.

Typescript. Includes vita and abstract. Bibliography: Includes bibliographical references (leaves 208-216). Description: xiv, 216 leaves : maps ; 29 cm.

Typescript. Includes vita and abstract. Bibliography: Includes bibliographical references (leaves 42-46).

Typescript. Includes vita and abstract. Bibliography: Includes bibliographical references (leaves 283-301). Description: xxx, 301 leaves : ill. ; 29 cm.

xv, 151 p. : ill. A print copy of this thesis is available through the UO Libraries. Search the library catalog for the location and call number. / The sea anemone Metridium senile occurs along a salinity gradient in the South Slough Estuary, Oregon, where it is subjected to frequent and sometimes large fluctuations in salinity. This study determined how hypo-osmotic stress contributes to the survival and distribution of this population. In the laboratory, chronic exposure ofM. senile to 50% and 75% seawater for twenty-eight days resulted in partial regulation of volume and magnesium ions. Anemones transplanted to the field exhibited increased mortality and partial regulation of volume, osmolality, and magnesium ions with decreased salinity during the wet season (December-February) and less regulation during the dry season (June-August). This pattern of physiological tolerance coincides with observed trends of seasonal abundance and distribution. Previous studies describe M senile as a marine osmoconformer, however this estuarine population is able to withstand moderate hypo-osmotic stress through partial regulation of tissue osmolality and magnesium ions. / Committee in Charge: Dr. Craig M. Young, Chair; Dr. Nora B. Terwilliger; Dr. Steven S. Rumrill; Dr. Caren E. Braby

This work presents the first in-depth analysis of Miluk Coos, a language previously spoken on the southern Oregon Coast. Miluk is normally classified as a member of the Oregon Coast Penutian group, a sub-branch of the Penutian phylum. However, Miluk demonstrates a number of affinities with the Salish language family. These similarities can be seen in a variety of domains. There are morphosyntactic features in Miluk which appear to resemble phenomena seen in Salishan languages. Additionally, some apparent cognates with Proto-Salish are discussed, including some which seem to exhibit regular correspondences. / 10000-01-01

xiv, 154 p. : ill. A print copy of this title is available through the UO Libraries. Search the library catalog for the location and call number. / The polychaete worm Owenia collaris (Family Oweniidae) is found in soft sediment habitats along the northeastern Pacific coast, particularly within bays and estuaries. Seasonally, these small tubeworms spawn gametes freely into the water column where they develop into planktotrophic mitraria larvae. After three to four weeks at ambient temperatures, they undergo a dramatic metamorphosis and return to the bottom. The reproductive and larval biology of a population of O. collaris in Coos Bay, OR was investigated over several years. The development of this polychaete has several unusual features, including a stomodeum not derived from the blastopore and continued proliferation of trochoblast descendents, producing simple cilia on monociliated cells. The description of larval and juvenile structures provided morphological characteristics useful for distinguishing this species from the congener O. fusiformis . The consequences of the unusual larval morphology of O. collaris (i.e. simple cilia, convoluted ciliated band) were investigated by comparing the feeding performance and growth of this species with those of invertebrate larvae representative of the more typical tornaria-type larval forms found in deuterostomes and trochophore-type larval forms found in the lophotrochozoa. Feeding and growth patterns were similar in the convergent mitraria and deuterostome larval forms. In an experiment designed to test the relationship between abiotic factors and the seasonal reproduction, the onset of breeding was cued by photoperiod, but seasonal trends in temperature, alkalinity, food availability for larvae, and salinity may drive reproductive patterns as well. Within the Coos Bay estuary, the intertidal distribution of O. collaris is related to adult salinity tolerances. Low salinity limits horizontal distribution and also reduces potential for reproduction. Most life-history stages are tolerant of a wide range of temperatures, both higher and lower than those typically seen in Coos Bay. There is little evidence to support the hypothesis that sediment characteristics limit distribution within the bay, although settling juveniles show some preference for small grain sizes and may not be able to recruit to mudflats that completely lack these size fractions.

xi, 134 leaves : ill. ; 28 cm Notes Typescript Thesis (M.A.)--University of Oregon Includes vita and abstract Bibliography: leaves 130-134 Another copy on microfilm is located in Archives

vii, 97 leaves : ill., maps ; 28 cm Notes Typescript Thesis (M.S.)--University of Oregon, 1985 Includes vita and abstract Bibliography: leaves 92-97 Another copy on microfilm is located in Archives