Trends in fish prey capture by common terns following zebra mussel invasion : do terns track fish species abundance? /

The Common Tern (Sterna hirundo) is a ground nesting colonial seabird. Terns rely primarily on small prey fishes which they obtain through plunge diving for their survival as well as the survival of their offspring during the breeding season. The zebra mussel (Dreissena polymorpha) is a small bivalve mollusk that invaded North American waters in the late 1980's. Through its suspension feeding, the zebra mussel has the ability to alter the entire aquatic ecosystem, ultimately leading to a reduction in pelagic organisms including small prey fish. The objective of the study was to determine what (if any) indirect effects the invasion of the zebra mussel has had on fish prey captured by terns. The study took place in two separate two-year periods, 1990-91 and 1995-96 on a concrete breakwall off the north shore of Lake Erie near Port Colborne, Ontario. Daily nest checks revealed clutch initiation dates, egg-laying chronology, hatching success and morphological egg characteristics (length and breadth). Behavioural observations included time each sex spent in attendance with its brood, the frequency of feeding chicks and the prey species composition and size fed to chicks as well as to females (courtship feeding). Egg sizes did not differ between study periods, nor did feeding rates to chicks, suggesting that food was not a limiting resource. Terns spent less time with their broods (more time foraging) in the 1995-96 period. However, they also had significantly larger broods and fledged more offspring. The time of each individual foraging trip decreased, suggesting that fish were easier to obtain in 1995 and 1996. Lastly, kleptoparasitism rates decreased, suggesting that the costs of foraging (time, energy) actually decreased as fewer birds adopted this strategy to compensate for what I assumed to be a lack of available food (fish). The only significant difference between the periods of 1990, 1991 and 1995, 1996 was a change in diet. Terns delivered significantly fewer rainbow smelt and more emerald shiner in 1995 and 1996. However, the average size of fish delivered did not change. Thus, there was little impact on prey captured by Common Terns in Lake Erie since the invasion of the zebra mussel.

Analytical modelling of bacterial migration and accumulation with rate-limited sorption in discrete fractures

An analytical model for bacterial accumulation in a discrete fractllre has been developed. The transport and accumlllation processes incorporate into the model include advection, dispersion, rate-limited adsorption, rate-limited desorption, irreversible adsorption, attachment, detachment, growth and first order decay botl1 in sorbed and aqueous phases. An analytical solution in Laplace space is derived and nlln1erically inverted. The model is implemented in the code BIOFRAC vvhich is written in Fortran 99. The model is derived for two phases, Phase I, where adsorption-desorption are dominant, and Phase II, where attachment-detachment are dominant. Phase I ends yvhen enollgh bacteria to fully cover the substratllm have accllillulated. The model for Phase I vvas verified by comparing to the Ogata-Banks solution and the model for Phase II was verified by comparing to a nonHomogenous version of the Ogata-Banks solution. After verification, a sensitiv"ity analysis on the inpllt parameters was performed. The sensitivity analysis was condllcted by varying one inpllt parameter vvhile all others were fixed and observing the impact on the shape of the clirve describing bacterial concentration verSllS time. Increasing fracture apertllre allovvs more transport and thus more accllffilliation, "Vvhich diminishes the dllration of Phase I. The larger the bacteria size, the faster the sllbstratum will be covered. Increasing adsorption rate, was observed to increase the dllration of Phase I. Contrary to the aSSllmption ofllniform biofilm thickness, the accllffilliation starts frOll1 the inlet, and the bacterial concentration in aqlleous phase moving towards the olitiet declines, sloyving the accumulation at the outlet. Increasing the desorption rate, redllces the dliration of Phase I, speeding IIp the accllmlilation. It was also observed that Phase II is of longer duration than Phase I. Increasing the attachment rate lengthens the accliffililation period. High rates of detachment speeds up the transport. The grovvth and decay rates have no significant effect on transport, althollgh increases the concentrations in both aqueous and sorbed phases are observed. Irreversible adsorption can stop accllillulation completely if the vallIes are high.

Letter from George W. Campbell, esq., late Secretary of the Treasury, to the Chairman of the Committee appointed to inquire into the causes and particulars of the invasion of the City of Washington, and the neighboring town of Alexandria, in the month of August last. --

Laid before the House by the Chairman of the said Committee, and ordered to be printed January 2, 1815.

X-ray diffraction of a gram-negative bacterial membrane mimetic

This thesis applies x-ray diffraction to measure he membrane structure of lipopolysaccharides and to develop a better model of a LPS bacterial melilbrane that can be used for biophysical research on antibiotics that attack cell membranes. \iVe ha'e Inodified the Physics department x-ray machine for use 3.'3 a thin film diffractometer, and have lesigned a new temperature and relative humidity controlled sample cell.\Ve tested the sample eel: by measuring the one-dimensional electron density profiles of bilayers of pope with 0%, 1%, 1G :VcJ, and 100% by weight lipo-polysaccharide from Pse'udo'lTwna aeTuginosa. Background VVe now know that traditional p,ntibiotics ,I,re losing their effectiveness against ever-evolving bacteria. This is because traditional antibiotic: work against specific targets within the bacterial cell, and with genetic mutations over time, themtibiotic no longer works. One possible solution are antimicrobial peptides. These are short proteins that are part of the immune systems of many animals, and some of them attack bacteria directly at the membrane of the cell, causing the bacterium to rupture and die. Since the membranes of most bacteria share common structural features, and these featuret, are unlikely to evolve very much, these peptides should effectively kill many types of bacteria wi Lhout much evolved resistance. But why do these peptides kill bacterial cel: '3 , but not the cells of the host animal? For gramnegative bacteria, the most likely reason is that t Ileir outer membrane is made of lipopolysaccharides (LPS), which is very different from an animal :;ell membrane. Up to now, what we knovv about how these peptides work was likely done with r !10spholipid models of animal cell membranes, and not with the more complex lipopolysa,echaricies, If we want to make better pepticies, ones that we can use to fight all types of infection, we need a more accurate molecular picture of how they \vork. This will hopefully be one step forward to the ( esign of better treatments for bacterial infections.

Letter from George W. Campbell the Chairman of the Committee appointed to inquire into the causes and particulars of the invasion of the City of Washington

Full Title: Letter from George W. Campbell, esq., late Secretary of the Treasury, to the Chairman of the Committee appointed to inquire into the causes and particulars of the invasion of the City of Washington, and the neighboring town of Alexandria, in the month of August last Laid before the House by the Chairman of the said Committee, and ordered to be printed January 2, 1815. 13th Congress, 3rd Session. House. Doc. 38. Printed by Roger C. Weightman

Broadside reporting the Fenian Invasion of Canada, June 2, 1866

The Fenians were a group intent on securing Irish independence from England. The movement had its origins in Ireland in1857, under the leadership of James Stephens, with the assistance of John O'Mahony, an American who had raised funds for the cause. The American branch of this movement was especially successful, having raised $500 000 and enlisting about 10 000 American Civil War veterans. The group split into two separate factions, one desiring an invasion of Canada and the other preferring an uprising in Ireland. It soon became apparent that an uprising in Ireland was not imminent, and a decision was made to invade Canada. In April, 1866, a raid was launched against New Brunswick. It proved unsuccessful, and another raid was attempted on June 1, 1866, this time in Ridgeway, near Fort Erie, Ontario. The Canadian militiamen were defeated, but the Fenians subsequently withdrew. A third incident occurred on June 7, this time at Missisquoi Bay in Quebec, when the Fenians crossed the border, remained there for 2 days, and withdrew. A failed uprising in Ireland in 1867 signaled the demise of the movement. The Fenian threat helped to promote a sense of union among Canadians and provided an incentive for Confederation.

Broadside reporting the Fenian Invasion of Canada, June 2, 1866

The Fenians were a group intent on securing Irish independence from England. The movement had its origins in Ireland in1857, under the leadership of James Stephens, with the assistance of John O'Mahony, an American who had raised funds for the cause. The American branch of this movement was especially successful, having raised $500 000 and enlisting about 10 000 American Civil War veterans. The group split into two separate factions, one desiring an invasion of Canada and the other preferring an uprising in Ireland. It soon became apparent that an uprising in Ireland was not imminent, and a decision was made to invade Canada. In April, 1866, a raid was launched against New Brunswick. It proved unsuccessful, and another raid was attempted on June 1, 1866, this time in Ridgeway, near Fort Erie, Ontario. The Canadian militiamen were defeated, but the Fenians subsequently withdrew. A third incident occurred on June 7, this time at Missisquoi Bay in Quebec, when the Fenians crossed the border, remained there for 2 days, and withdrew. A failed uprising in Ireland in 1867 signaled the demise of the movement. The Fenian threat helped to promote a sense of union among Canadians and provided an incentive for Confederation.

Broadside Reporting the Fenian Invasion of Canada, June 3 1866

The collection consists of 6 broadsides reporting the events of the Fenian invasion of Canada on June 2 and 3, 1866. This broadside is titled Globe Extra and is from the evening of June 3rd, 1866. Some of the headings include: "Numerous Fenian Prisoners in our Hands", "All Quiet at Sarnia!" and "Further from Montreal! Troops Leaving for the Front".

Broadside Reporting the Fenian Invasion of Canada, June 4 1866

The collection consists of 6 broadsides reporting the events of the Fenian invasion of Canada on June 2 and 3, 1866. Three of the broadsides are titled Leader Extra, two are titled Globe Extra, and the last is titled News Extra. This one is titled Leader Extra and leads with the heading "Fenian Prisoners Twenty-One of them in Toronto Jail. Also included, "Latest American Reports: Interesting News from the East".

Broadside Reporting the Fenian Invasion, June 2 1866

The collection consists of 6 broadsides reporting the events of the Fenian invasion of Canada on June 2 and 3, 1866. Three of the broadsides are titled Leader Extra, two are titled Globe Extra, and the last is titled News Extra. This one is titled Leader Extra and begins with 2nd edition and ends with 8th edition. The headings include: "First Engagement: Our Gallant Volunteers foremost in the Attack", "Victory! Victory!", "Fenian Leader Shot", Battle at Fort Erie".

Broadside Reporting the Fenian Invasion, June 3 1866

The collection consists of 6 broadsides reporting the events of the Fenian invasion of Canada on June 2 and 3, 1866. Three of the broadsides are titled Leader Extra, two are titled Globe Extra, and the last is titled News Extra. This one is titled "Globe Extra!" and headings include "Colonel Peacock's Force", "Col. Lowry Joins Col. Peacock with Reinforcements", "Colonel Dennis' Skirmish", "Colonel Booker's Skirmish!", "Fenian Movements at Ogdensburg", "Tereatened Raid at St. Albans", "Preparations at Cornwall!", "Latest! Bad News! The Fenians Escaped! The Whole Horde Fled Across the River."

Broadside Reporting the Fenian Invasion, June 2 1866 (evening)

The collection consists of 6 broadsides reporting the events of the Fenian invasion of Canada on June 2 and 3, 1866. Three of the broadsides are titled Leader Extra, two are titled Globe Extra, and the last is titled News Extra. This one is titled "Leader Extra" and the headings include: "From St. Catharines: The Queen's Own Behaved Well", "The Fort Erie Affair: List of our Men Taken Prisoners", From Port Colborne. Muir and Fahey only Wounded", "The Ridgeway Affair: List of Killed and Wounded", "Militia General Orders. More Troops Called Out", "Military Preparations. Latest from Head Quarters", "The Preparations in the East", "From Montreal. The American Authorities Waked up in the East", "Report from New Germany", "The Evacuation of Fort Erie. The Fenians Cross at two this morning".