La Perouse Research Articles

Recruitment and the Timing of Reproduction in Lesser Snow Geese (Chen caerulescens caerulescens)

Abstract Recruitment of offspring into a breeding population of Lesser Snow Geese (Chen caerulescens caerulescens) at La Perouse Bay, Manitoba was used as a measure of reproductive success to assess the relative fitness of females who hatched their clutches early, middle, and late in the breeding season. In three of seven seasons investigated, goslings from early-hatching clutches showed significantly greater recruitment rates than their middle- or late-hatching counterparts. No significant differences in recruitment rates were detected in the other four seasons, although early-hatching clutches showed numerically higher recruitment rates in three of these seasons. There is, therefore, some indication of directional selection for early breeding. This conclusion contrasts with that drawn by Cooke and Findlay (1982), who, using fledging success as a measure of reproductive fitness, showed that females whose clutches hatched in the middle period had the highest fitness and concluded that the population was being exposed to stabilizing selection for synchronization. The discrepancy between these results and those presented in this paper indicates that conclusions concerning the action of selection in natural populations depend heavily upon the stage of the life cycle during which reproductive success is estimated. As such, evolutionary biologists must be cautious of relying too heavily on measures taken too early in the life of the organism.

Temporal and spatial variability in the community structure of the fauna of four sandy beaches in south-eastern New South Wales.

Four intertidal sandy beaches with different exposures, La Perouse, Ocean Beach, Dolls Point, and Towra Point, were studied for temporal and spatial changes in faunal composition and community structure. Each of these beaches was sampled from 6 to 12 times between July 1980 and July 1981 using a 500 �m sieve. A stratified random sampling procedure across the intertidal zone isolated 40 660 individuals representing 85 species. Distribution and abundance of species were strongly influenced by tidal level. Densities changed during the year but no seasonal changes in intertidal zonation patterns were found. Changes in density were correlated with the reproductive activities of the abundant species, especially Pseudolana concinna and Exoediceros maculosus at La Perouse, and Spio pacifica at Dolls Point and Towra Point. The number of species increased from high to low tide, and also increased with decreasing exposure to wave action. Crustaceans dominated the fauna in the most exposed site and decreased in abundance with increasing protection. Ocean Beach experienced the least fluctuation in physical factors such as wave action, salinity, and temperature, and its fauna exhibited the highest diversity index (H') and evenness (J'), the most stable density, and the greatest stability in faunal composition through time. The highest densities and the most species were found at Towra Point, which also was the most protected site.

Life history studies of the Lesser Snow Goose (Anser caerulescens caerulescens)

We examined the spatial distribution of nesting cohorts of female Lesser Snow Geese (Anser caerulescens caerulescens) in a small colony located at La Perouse Bay, Manitoba. In general, cohorts show a heterogeneous spatial distribution, which arises from a tendency of females of the same cohort affiliation to cluster together. Further-more these associations are maintained through time, such that cohorts tend to dominate particular regions of the colony over several breeding seasons. These findings provide further evidence for breeding site fidelity among female lesser snow geese.

Structure and Petrology of the La Perouse Gabbro Intrusion, Fairweather Range, Southeastern Alaska

Structure and Petrology of the La Perouse Gabbro Intrusion, Fairweather Range, Southeastern Alaska

Pt, Pd, and Rh analyses and beneficiation of mineralized mafic rocks from the La Perouse Layered Gabbro, Alaska

Pt, Pd, and Rh analyses for 34 whole-rock samples and concentrates from the La Perouse Layered Gabbro in Alaska show that concentrations of these elements are normal for sulfide melts which give rise to Ni-Cu ores. Average Pt + Pd + Rh concentrations are 0.18 ppm in ultramarie and gabbroic rocks and 1.2 to 1.5 ppm in massive sulfide and flotation concentrates. Recovery of Pt, Pd, and Rh could have substantial impact on mining economics.

Further radiocarbon dates from Westland National Park and the Omoeroa River mouth, New Zealand

Abstract New radiocarbon dates fix an advance of the Franz Josef Glacier at c. 11 000 yr B.P., and refine the chronology already reported for the La Perouse and Horace Walker Glaciers. A radiocarbon date of 3 550 ° 80 yr B.P. is reported for a forest bed at the mouth of the Omoeroa River.

Zoned Cr, Fe-spinel from the La Perouse layered gabbro, Fairweather Range, Alaska

Zoned spinel of unusual composition and morphology has been found in massive pyrrhotite-chalcopyrite-pent-landite ore from the La Perouse layered gabbro intrusion in the Fairweather Range, southeastern Alaska. The spinel grains show continuous zoning from cores with up to 53 wt.% Cr 2O 3 to rims with less than 11 wt.% Cr 2O 3. Their composition is exceptional because they contain less than 0.32 wt.% MgO and less than 0.10 wt.% Al 2O 3 and TiO 2. Also notable are the concentrations of MnO and V 2O 3, which reach 4.73 and 4.50 wt.%, respectively, in the cores. The spinel is thought to have crystallized at low oxygen fugacity and at temperatures above 900°C, directly from a sulfide melt that separated by immiscibility from the gabbroic parental magma.

Study Centres for Aboriginal Children in New South Wales

Over the last decade a number of study centres for Aboriginals have been established in both urban and rural situations. Most of these centres have not been able to continue for long beyond the initial burst of enthusiasm which brought them into existence. Others have failed for other reasons. Most were established under the aegis of the Aboriginal Education Council (N.S.W.) and in 1973 the President of the Council was unable to say whether or not any of the centres, apart from the one at La Perouse, were still in existence.

A Genetic Analysis of Lesser Snow Goose Families

ALTHOUGH genetic polymorphism is well-documented with respect to avian plumage color, surprisingly few studies have investigated the genetic basis of the polymorphism. The major limitations on studies of this nature have been an inadequate sample size and a lack of expression of the polymorphic character at some stage in the life cycle. In the Lesser Snow Goose, Anser caerulescens caerulescens, these limitations do not apply and it has been possible to undertake an investigation into the blue and white phases of this species. Earlier work has indicated that the dimorphism is regulated by a single pair of alleles with the blue phase dominant over white (Cooke and Cooch, 1968). This conclusion was based on analyses where data from several different families were pooled to give genetic ratios. This method, while adequate to show the probable genetic basis for the polymorphism, would have been more convincing if individual families had been available for analysis. Further, it gave no clear indication as to whether the gene controlling color was sex-linked or not. During the summers of 1968, 1969, and 1970 it was possible to collect individual family data from the La Perouse Bay colony near Churchill, Manitoba. An analysis of data from families collected from this colony has supported the earlier findings of Cooke and Cooch as well as demonstrating that the gene is autosomal and not sex linked. METHODS Collection of data.-In the breeding colony, nests were marked with stakes and numbered several days prior to hatch. Much of the colony was marked in this manner, and it is thought that no sampling bias exists. At hatch both parents remain near the nest, and at this time the phenotypes of parents and goslings could be scored. The color phases were recorded according to the criteria of Cooke and Cooch (1968), and little difficulty was encountered in assigning birds a given color category. Families were recorded only at the marked nest site. If all goslings had not hatched when a given nest was visited, the family was recorded as having only those offspring that had hatched, even though the final family size would presumably be larger. This could give the data some bias if certain genotypes hatch earlier than others. Families with more than five offspring were ignored in the statistical analysis, as it has been shown (Cooch, 1961), and the present study confirms,that large families have a tendency to arise from two or more females laying eggs in the same nest. Segregation analysis.-A number of features of the Lesser Snow Goose restricted the type of genetic analysis that could be attempted on the sample population.

Structure of terrestrial crust in southern Sakhalin and adjacent aquatoria

Recent deep seismic sounding and other data suggest presence of a deep rift which cuts across southern Sakhalin, Aniva Bay, La Perouse Strait, and Hokkaido Island, a suboceanic type of crust in the Sea of Okhotsk, and a continental one in Sakhalin. The density-velocities relationship determined here may account for the observed gravity anomalies as due primarily to variations in thickness of the crust (fig. 6), without resorting to other hypotheses.

Glaciation of the Mt La Perouse area

Glacial ice has been dominant in sculpturing the landscape of the Mt La Perouse area. Glacial erosional features, moraines and periglacial and nivational deposits indicated that the geomorphology of the area can be accounted for by one period of glaciation accompanied by periglacialion and nivation.

Sakhalin Island: Soviet Outpost in Northeast Asia

S oviet Sakhalin (area: 30,500 square miles) is one of most economically promising and strategically important areas in Northeast Asia. The island's rich natural resources (fisheries, forests, coal, and oil) have played a vital role in development of Soviet Far East. Located between of Hokkaido and mouth of Amur River, Sakhalin forms a natural bridge between Japanese islands and Asiatic continent. Sakhalin not only controls entrance to Amur River, but it presides over two straits (Tatary and La Perouse) that connect Sea of Japan with Sea of Okhotsk. Soviet observers are fully cognizant of Sakhalin's contribution to region's defense and economic development and have characterized it as our treasure island and the forepost of Soviet nation on Pacific Ocean.' Historically, Sakhalin is East Asia's Alsace-Lorraine. Each of great nations surrounding it (China, Russia, Japan) have at one time exercised sovereignty there. The Sino-Soviet and Soviet-Japanese territorial disputes do not at present involve Sakhalin,2 but it would be premature to conclude that has ceased to be an issue of international rivalries. Since end of Second World War, accurate information regarding Sakhalin's internal development has been difficult to obtain. As a sensitive frontier area, is off limits to all foreigners, and even Russian visitors require special passes to set foot on Sakhalin. The Japanese who ruled southern Sakhalin from 1905 to 1945 and whose northern frontier approaches to within 25 miles of island, have paid little attention to Sakhalin's postwar development. This article attempts to fill partially in-

John Ledyard: The American Traveler and His Sentimental Journeys

IT IS not much to our credit if, as students of the eighteenth century, we seldom accord more than a footnote, if indeed that much, to the field of eighteenth-century accomplishment that is represented by names like Anson and Commodore Byron, Bligh and Carteret and Wallis, Bougainville and La Perouse, Kerguelen and Marion du Fresne. There are signs that a generation which has learned to concern itself, however superficially, with ecology may redress this balance and teach us that we cannot know the European Enlightenment unless we know its navigators and hydrographers, who are necessarily also its first experimental ethnologists and zoologists. It is high time. And the consequences may be extraordinary and astonishing. What happens, for instance, to our image of the age of sensibility, if we try to accommodate, as a massive and defining enterprise of that age, the most momentous and heroically sustained navigations of all, the three voyages of Captain James Cook? What does Cook amount to, in the image that we make for ourselves of that Europe of the 1760s and 1770s which Cook departed from, and returned to? So far as I am aware, the question has been asked, and a tentative answer to it has been ventured, by only one scholar-by J. C. Beaglehole, whose magnificent erudition on everything that concerns the great hydrographer is monumentally summed up in his great editions of Cook's journals. Beaglehole, more than any one else, has the right to ask the questions:

ON THE IDENTITY OF BRODSKY'S EPILABIDOCERA AMPHITRITES AND PONTELLA PULVINATA WILSON, 1950 WITH PONTELLA LONGIPEDATA SATO, 1913 (COPEPODA : CALANOIDA)

The calanoid copepod Epilabidocera amphitrites of the family Pontellidae was originally described by McMuRRICH (1916) as Paralabidocera amphitrites n. g., n. sp. from the west coast of Vancouver Island, British Columbia, Canada. However, since the generic name Paralabidocera had been preoccupied by WoLFENDEN (1908) for a far different generic group of copepods which is now classified in the family Acartiidae, WILSON ( 1932, p. 558) proposed a new name Epilabidocera as a substitute for McMuRRICH's Paralabidocera. Now, Epilabidocera amphitrites is recorded from the eastern North Pacific and the Arctic Sea, including the west coast of the United States north of San Francisco Bay, the Gulf of Alaska, the eastern Bering Sea, the Chukchi Sea and off Point Barrow, northern Alaska (WILLEY 1920; EsTERLY 1924; CAMPBELL 1929; JoHNSON 1932, 1953, 1956, 1958; DAvis 1949; BEKLEMISHEV 1961; OMORI 1965; etc.) It was BRODSKY ( 1948) that recorded Epilabidocera amphitrites for the first time in the western North Pacific from the west coast of Kamchatka and Furugelma Island near Vladivostok in the northwestern Japan Sea. The same author again referred to this pontellid under the same name in his monograph (BRODSKY 1950) on the Copepoda Calanoida of the Far-Eastern seas of the U.S.S.R. and the Polar basin, and mention­ ed that its distribution in the western North Pacific covered the both coasts of Kam­ chatka and the east coast of Sakhalin (Karafuto) as well as the northwestern Japan Sea. Since then, !£· amphitrites has been recorded repeatedly in the western North Pacific by the Russian authors as shown below: PoNOMAREVA (1954)-From the Soya (La Perouse) Straits. BRODSKY ( 195 7)-Possjet Bay south of Vladivostok; southwestern Sakhalin; the northern area of the Mamiya (Tartary) Straits; southern Kuriles; eastern Sakhalin (also, the eastern Bering Sea and the Chukchi Sea). BRODSKY (1959)-Terpenija (Patience) Bay, Sakhalin, where it occurs in dense

AGE OF LAVA FLOWS ON HALEAKALA, MAUI, HAWAII

La Perouse9s chart of the Hawaiian Islands, drawn in 1786, was compared with Vancouver9s chart of 1793 in an attempt to date the lava flow near La Perouse Bay, Maui. The prominent bulge formed by the flow is shown by Vancouver but not the accurately drawn chart of La Perouse, so that the date of eruption of the flow may be set at 1790 ± 4 years.

FLUCTUATIONS OF CRILLON GLACIER SYSTEM, SOUTHEAST ALASKA

Abstract Crillon Glacier system (Lat. 58° 37′ N, Long. 137° 23′w) consisting of two long feeding arms and a common T-shaped ending along the Fairweather Fault, with two cliffed termini, has been advancing. La Perouse's sketch map in 1786 suggests that North and South Crillon Glaciers were back far enough to have separate termini in Lituya Bay, so they must have advanced at about 30 m/yr for 150 years. More detailed maps and photos show that North Crillon terminus did advance 28 m/yr into open water positions from 1894 to 1933. Some of this 4.5 km advance may well be just the result of consolidation of two long calving ice cliffs into one deep water front. South Crillon front in the other arm of the “T”, where no junction of fronts is involved, also advanced into Crillon Lake 10 m/yr between 1929 and 1961. This implies that the basic cause was some increased snowfall on the high mountains. At the same time glaciers from lower peaks just to the east of Glacier Bay lost nearly all accumulation by a rising sn...

極東亞産スゲ屬植物の分布 (續報)

1. Carices of this region are much more connected to the outer regions through Saghalien than the Kurile Isls..2. The Kurile Isis. may be divided into three districts on the phytogeographical point of view.3. Some Saghalien species are found in south-eastern Hokkaido or Isl. Shikotan, and the species existing in Honshiu are partly found only in the central to eastern Hokkaido.4. La Perouse Strait and Tsugaru Strait divide the distributions, but not so evidently.5. Quelpaert are more closely related to Japan than the Korean peninsula.6. Some species grow in Central China, (Southern Korea) and Japan.7. Utricles float for a long time, showing the most important factor for the distribution, and the sea currents are useful for this purpose.8. The distributions have much references along with the climatic and edaphic conditions since Tertiary period, and also width of habitats in respective species.9. Some Australian species resemble those of this region, and the endemic species in the small islands show remarkable features. These facts suggest us the formation of the new species of Carices rather in short times.

Early Botanical Explorers on the Pacific Coast and the Trees They Found There

Research Article| December 01 1939 Early Botanical Explorers on the Pacific Coast and the Trees They Found There Alice Eastwood Alice Eastwood Search for other works by this author on: This Site PubMed Google Scholar California Historical Society Quarterly (1939) 18 (4): 335–346. https://doi.org/10.2307/25160840 Views Icon Views Article contents Figures & tables Video Audio Supplementary Data Peer Review Share Icon Share Twitter LinkedIn Tools Icon Tools Get Permissions Cite Icon Cite Search Site Citation Alice Eastwood; Early Botanical Explorers on the Pacific Coast and the Trees They Found There. California Historical Society Quarterly 1 December 1939; 18 (4): 335–346. doi: https://doi.org/10.2307/25160840 Download citation file: Ris (Zotero) Reference Manager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex toolbar search Search Dropdown Menu nav search search input Search input auto suggest search filter All ContentCalifornia History Search This content is only available via PDF. Copyright 1939 The California Historical Society Article PDF first page preview Close Modal You do not currently have access to this content.

Petrology of the Hawaiian Islands, V; The Leeward Islands

The lavas of the volcanic Leeward Hawaiian Islands, including Niihau, Nihoa, Necker, La Perouse, and Gardner, are predominantly, if not entirely, basaltic. Assuming that the specimens studied by us are representative, andesine basalt is comparatively rare, olivine-free labradorite basalt is more abundant, olivine-labradorite basalt is most common, and picrite basalt is somewhat less so. One specimen of nephelitic basalt and one of limburgitic basalt were found. There seem to be no andesites and no trachytic rocks or oligoclasite. The general facies is one of decidedly femic rocks, low in silica and alkalies, with high lime and very high magnesia and iron oxides. Titanium is high, but phosphorus is low. There appears to be an increase westward in olivine, as well as in magnesia and titanium, with a concomitant decrease in silica.

Eustatic Bench of Islands of the North Pacific

Introduction Daly 2 has compiled descriptions of raised wave-cut platforms from about thirty places scattered about the world. The present authors have been struck by the fact that a bench from 4 to 12 feet above mean sea-level exists on all of the volcanic islands of the Hawaiian chain, without exception. Every island in the chain shows it. One or the other of us has observed the bench on La Perouse Rock at French Frigates Shoal, Necker Island, Nihoa Island, Kaula Island, Kauai, Oahu, Molokai, Lanai, Maui, Kahoolawe, and Hawaii. Study of photographs in the files of the Honolulu office of the Hawaiian District of the United States Lighthouse Service indicates that the bench exists on Lehua and Molokini. A photograph, blurred by the motion of the surfboat from which it was taken, suggests that Gardner has the bench. Reliable oral testimony indicates that the bench is to be found on . . .