328,476 research outputs found
Freshwater fish and crayfish communities of the tributaries of the Margaret River
No full textTributaries and headwaters of major rivers are known to be important spawning and nursery habitats of freshwater endemic fishes in south-western Australia (see for example the Collie River in Pen & Potter 1990, and the Blackwood River in Beatty et al. 2006, 2008). Fishes of the Margaret River have previously been examined by Morgan et al. (1998) and Morgan & Beatty (2003) with the monitoring of the functioning of the two fishways on the river documented in Morgan & Beatty (2004, 2007) and Beatty & Morgan (2008). The river is known to be of conservation importance due to it housing five of the eight endemic freshwater fishes of the south-west region, as well as housing the majority (five of the six species) of the Cherax species of freshwater crayfishes found in the south-west; including the Margaret River endemic Critically Endangered Hairy Marron.
Despite this known value and considerable volume of research on the fishes in the main channel of the Margaret River, little is known on the fishes and freshwater crayfishes of the river 19s major tributaries. The aim of this study is to document the freshwater fish distribution in the major tributaries of the Margaret River (i.e. Bramley, Darch, and Yalgardup Brooks) during or close to the breeding period for the majority of the species and to provide a broad assessment and comparison of population demographics of the different species in the different tributaries. This information is required for the formulation of River Action Plans for these systems by the Cape to Cape Catchments Group
Risk assessment of Record Brook interbasin water transfer scheme to the aquatic fauna of the Donnelly and Warren Rivers
No full textThis report describes the fishes and freshwater crayfishes of the Donnelly and Warren River catchments and provides a risk assessment to these fauna of the proposed extraction of water from Record Brook (tributary of the Donnelly River) and subsequent transfer to Scabby Gully Dam (Warren River catchment). The proposed location of the structure in Record Brook is at the gauging station ~1 km upstream from the confluence with the Donnelly River. The project aims to divert peak flows in the winter and spring flow period, transferring around 500 ML each year. The size and shape of the interception structure is yet to be determined, but are likely to incorporate a concrete weir < 5m high and a reservoir.
A total of six sites in Record Brook, Donnelly River and Scabby Gully Dam were sampled and these data were collated with additional historical information on the aquatic fauna of both catchments. An overview of fishes and freshwater crayfishes in the Donnelly River is summarised in Morgan & Beatty (2006), the authors recorded a high diversity of native freshwater species [Salamanderfish, Western Minnow, Black-stripe Minnow, Western Mud Minnow, Nightfish, Western Pygmy Perch, Balston’s Pygmy Perch, Freshwater Cobbler, (metamorphosed) ammocoetes of the Pouched Lamprey, Marron, (Restricted) Gilgie, Koonac, Freshwater Shrimp] as well as several estuarine [Western Hardyhead, Blue-spot Goby, South-west Goby] and non-native species [Mosquitofish, Redfin Perch, Rainbow Trout and Brown Trout]. The Donnelly River system is one of only two in south-western Australia that houses all of the endemic fishes of the region. The fauna of Record Brook contrasted that within the main channel sites of the Donnelly River. Within Record Brook, the fauna was dominated by the Pouched Lamprey, Koonac and Rainbow Trout, with the occasional Marron, Western Minnow and Western Pygmy Perch recorded. Within the Donnelly River main channel sites, the captures included Nightfish, Blue-spot Gobies, the Restricted Gilgie, Freshwater Shrimp and introduced Eastern Mosquitofish.The ichthyofauna of the Warren River consists of 14 fish species and is similar to the Donnelly River with the notable absence of Balston’s Pygmy Perch and Salamanderfish. However, in Scabby Gully dam only Marron and Redfin Perch were observed.
The risks of transfer of parasites and disease, feral/native fish or crayfish from Record Brook to Scabby Gully Dam are low. Threats to fish and freshwater crayfish in Record Brook include changes to water quality (altered flow, altered habitat and/or changes in temperature, oxygen, salinity) and requires ongoing monitoring should the project be implemented. The highest threat to fish and freshwater fish would be the barrier to fish movement by construction of the proposed dam. The construction of a fishway at the proposed dam would reduce some of the negative impacts to fish migration but would also require ongoing monitoring. No specially protected fish and/or crayfish species have been recorded in Record Brook. However, Record Brook acts as an important nursery area for the Pouched Lamprey and this species is listed as a Priority Species (Priority 1) by the Department of Environment and Conservation. The contents of this report are intended to inform of future management options and do not constitute, or replace any assessment or approval processes that may be required in accordance with the Environmental Protection Act 1986 and/or Environmental Protection and Biodiversity Conservation Act 1999
Margaret River Fishway
No full textIn order to enhance the migrations of fish species in the Margaret River, the Margaret River Regional Environment Centre, in conjunction with the Department of Environment, constructed a rock ramp fishway at the Margaret River Weir (Apex Weir) between March and April 2003. Morgan and Beatty (2003) surveyed the fish fauna of the river during March 2003, capturing 9206 fish from five native species, one feral species and the pouched lamprey (Geotria australis) (see Plate 1). All of the native fishes of the river are endemic to south-western Australia while the feral species is the mosquitofish (Gambusia holbrooki). The only other records of fish from the river are those recorded by Morgan et al. (1998) and there are also a few records in the Western Australian Museum.
Large numbers of native fishes were known to be impeded by the town weir on their upstream migration during winter and spring. These native fishes included the western minnow (Galaxias occidentalis), western pygmy perch (Edelia vittata) and nightfish (Bostockia porosa). Furthermore, adult lampreys were often observed negotiating the weirs on Margaret River with the occasional dead animal also observed. The reservoir above the Margaret River Weir had the highest abundance of the feral mosquitofish with this section of the river also containing western minnows, nightfish and western pygmy perch, and beds for larval lampreys (ammocoetes) (Morgan and Beatty 2003). It was thus deemed appropriate that the construction of a fishway on the Margaret River would be beneficial to fish and lamprey migrations in the Margaret River
Beatty ratios, algorithms related to Sturmian sequences and uniform distribution theory
No full textThis dissertation is divided into three main sections. The main result of Section 1 is that, for
, irrational, the quantity is ``not too far'' from the series of fractional parts
i.e, the absolute value of the difference of these two quantities is less than one plus a ``small'' constant .
In order to prove this result, we first study
properties of ratios of elements of Beatty sequences and their
connection with Sturmian sequences. If we write for a real number and , then we are
concerned with ratios of the form
\noindent as well as their reciprocals. These types of quotients have various
properties. For example, the element of a Sturmian sequence with slope
can be defined by a difference of ratios
for some irrational numbers , , i.e, is positive or
negative depending on whether or not is an integer in the Sturmian
sequence with slope . We also study partial sums of the form
\begin{equation}
\label{thabs1}
\sum_{n\leq x} \frac{ a_{n+k}}{a_n}
\end{equation}
and find asymptotics for them. Next, we consider the series
\begin{equation*}
\sum_{n=1}^{\infty} \left(\frac{ a_{n+k}}{a_n}-\frac{ b_{n+k}}{b_n}\right)
\end{equation*}
\noindent and show that it satisfies an identity involving and for
the case when and are irrationals. This identity bears a
superficial resemblance to a discrete analogue of Frullani's integral.
The main result of the section is deduced as a corollary from this identity.
The identity is proved by using Sturmian sequences to write the sum
\eqref{thabs1} over the positive integers, finding asymptotics for
partial sums of elements of the Beatty sequences, and using summation by
parts techniques together with some combinatorial arguments.
In the second portion of this thesis we present a Minimum Excluded
with Skipping (MES) algorithm that generalizes minimum excluded type
algorithms. This algorithm has one sequence as input and another
sequence as output. We study this algorithm in connection with Beatty,
nonhomogeneous Sturmian, and other (not necessarily quasilinear) types
of sequences. A complete characterization of this algorithm is
presented in the case of an Beatty sequence. The proofs
of these theorems use Diophantine approximation, continued fractions
and various number theoretic and combinatorial arguments.
The third portion of this thesis deals with a topic related to a
theorem that begun as a conjecture of Steinhaus. This well known Three Gap Theorem states that
there are at most three gap sizes in the sequence of fractional parts
. The main discovery of this section is that if we
average over a short interval , the distribution
becomes continuous. Moreover, this continuous distribution is
universal in the sense that it is the same for any and any
interval around . Under these circumstances one would expect
that the above averaging process would introduce enough randomness in
the sequence so that the limiting distribution would be Poissonian.
However, we will prove that, surprisingly, this is not the case.Item withdrawn by Mark Zulauf ([email protected]) on 2012-07-07T17:25:03Z
Item was in collections:
University of Illinois Theses & Dissertations (ID: 1)
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Marriage record of Mirus, Joseph S. and Beatty, Josephine Ester
No full textMarriage license for Joseph S. Mirus and Josephine Ester Beatty. William Wilson de Hart was the officiant
David Beatty, "Admiral Sir David Beatty"
No full textI. O. Anverso: "ADMIRAL SIR DAVID BEATTY. PHOTO BY SPEAIGHT, LTD. 430.S. BEAGLES POSTCARDS". Reverso: "J. BEAGLES & CO. LTD., E. C., PRINTERS & PUBLISHERS GUARANTEED REAL PHOTOGRAPH. POST TRADE MARK CARD. BEST IN THE WORLD FOR CORRESPONDENCE FOR ADDRESS ONLY". Sello: "PRINTED IN ENGLAND BY BEAGLES & CO. LTD., LONDON E. C". Sello: "BRAGLES POST CARDS". Nota: David Richard Beatty (1871-1936) fue un almirante de la Royal Navy
Pilesize Dynamic One-Pile Nim And Beatty's Theorem
No full textIn [4] we proved a generalization of Beatty's Theorem which we stated came from the Nim value analysis of a game. In this paper we give the Nim value analysis of this game and show its relationship with Beatty's Theorem. The game is a one-pile counter pickup game for which the maximum number of counters that can be removed on each successive move changes during the play of the game. The move size is bounded by a move function f whose arguments are pile sizes. After analyzing this game, we discuss a blocking version of this game as well as the misere version
Ascending the Avon: fishes of the Northam Pool, and the Swan-Avon catchment
No full textThe fish fauna in the vicinity of the Northam Pool Weir was sampled seasonally between winter 2008 and autumn 2009. The results indicate that the fish community was characterised by species that are halotolerant including two estuarine species, the Western Hardyhead and Swan River Goby that are likely to have undergone large upstream expansions in the Swan‐Avon catchment due to secondary salinisation. However, two freshwater endemic species, the Western Minnow and Nightfish were also recorded in the vicinity of the weir. These, and other freshwater endemic species, have undergone large range reductions in this catchment as a result of salinisation. The study found evidence that the weir may be impeding the upstream movements of native fishes as found elsewhere in south‐western Australia and that construction of a well‐designed fishway would enhance population connectivity and increase their sustainability. It is recommended that additional sampling occurs during the major spawning periods of the freshwater species immediately below the weir to determine precisely when a future fishway would need to operate to allow maximum usage by resident native species. It is also recommended that fresh refuge habitats for freshwater fishes be identified to allow effective management measures to be implemented in those systems to halt their decline and reduce the risk of complete loss of these species from the Swan‐Avon catchment
Beatty, C, 407888
No full textThis record was harvested from a previous catalogue system and will be withdrawn in 2025. Information in this record may be superseded or incomplete. Visit this record in UMA's new catalogue at: https://archives.library.unimelb.edu.au/nodes/view/370891Surname: BEATTY
Given Name(s) or Initials: C
Military Service Number or Last Known Location: 407888
Missing, Wounded and Prisoner of War Enquiry Card Index Number: 37154181246
Item: [2016.0049.03218] "Beatty, C, 407888
Beatty, William, [No Service Number]
No full textThis record was harvested from a previous catalogue system and will be withdrawn in 2025. Information in this record may be superseded or incomplete. Visit this record in UMA's new catalogue at: https://archives.library.unimelb.edu.au/nodes/view/370892Surname: BEATTY
Given Name(s) or Initials: WILLIAM
Military Service Number or Last Known Location: No Service Number
Missing, Wounded and Prisoner of War Enquiry Card Index Number: 58135181247
Item: [2016.0049.03219] "Beatty, William, [No Service Number]
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