180,173 research outputs found
Consumption of submerged aquatic macrophytes by rudd (scardinius erythrophthalmus L.) in New Zealand
No full textIn experiments in New Zealand, rudd (Scardinius erythrophthalmus L.) of 108–277mm fork length (FL) ate a wide range of native and introduced submerged aquatic macrophytes in captivity and in the field. Rudd consumed the native charophytes Chara globularis Thuill., Chara fibrosa Ag. ex Bruz., and Nitella spp., the native macrophytes Potamogeton ochreatus Raoul. and Myriophyllum propinquum A. Cunn., and the introduced macrophytes Elodea canadensis Michx., Egeria densa Planch., Lagarosiphon major L., and Ceratophyllum demersum L. Rudd consistently consumed the Nitella spp. and Potamogeton ochreatus before Ceratophyllum demersum. From the results of experiments in tanks and in the field, we found the order of highest to lowest palatability was: Nitella spp. > Potamogeton ochreatus > Elodea canadensis> Chara globularis = Chara fibrosa> Egeria densa = Lagarosiphon major > Myriophyllum propinquum > Ceratophyllum demersum. The order of consumption was subject to some variation with season, especially for Egeria densa, Lagarosiphon major, and Myriophyllum propinquum. Rudd
consumed up to 20% of their body weight per day of Egeria densa in spring, and 22% of their body weight per day of Nitella spp. in summer. Consumption rates were considerably lower in winter than in summer. The results of our field trial suggested that the order of consumption also applies in the field and that rudd are having a profound impact on vulnerable native aquatic plant communities in New Zealand. Nitella spp. and Potamogeton ochreatus are likely to be selectively eaten, and herbivory by rudd might prevent the re-establishment of these species in
restoration efforts
Biology and potential impacts of rudd (Scardinius erythrophthalmus L.) in New Zealand
No full textRudd (Scardinius erythrophthalmus) is a cyprinid fish native to Europe that was illegally introduced into New Zealand in 1967. Between the 1960s and 1980s rudd were illegally spread to a number of lakes, ponds, and rivers in New Zealand, principally from the Waikato north. They now also occur in the Wanganui, Manawatu, Nelson, and Canterbury regions. Rudd undergo
ontogenetic changes in diet as they grow. Young-of-the-year rudd (58–65 mm mean fork length (FL)) ate a mixture of planktonic cladocerans and chironomid pupae, and potentially competed for these foods with common smelt (Retropinna retropinna). Larger rudd (100–149 mm FL) were primarily benthivorous, and potentially competed with perch (Perca fluviatilis) of the same size, brown bullhead catfish (Ameiurus nebulosus), and probably common bullies (Gobiomorphus cotidianus). Rudd of still larger sizes were
increasingly herbivorous, until at >200 mm FL their diet was >80% plant material. As rudd prefer native species of aquatic macrophytes to the introduced species, they can probably modify native plant communities and aid the invasion of introduced aquatic weeds. They may also have contributed to
the switch of Hamilton Lake from a macrophyte-dominated state to a phytoplankton-dominated state. It is time for the threats posed by rudd to be recognised, and for an education campaign to be mounted. As past rudd introductions have been done outside the law, increasing the severity of penalties for further illegal transfers is unlikely to be effective, and the coarse angling community should instead be included in management decisions concerning rudd
Christopher Rudd, 46
No full textChristopher R. Rudd, a Redwood City resident who grew up in Palo Alto has died. He was 46
Rudd, R A, NX69721
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/414659Surname: RUDD. Given Name(s) or Initials: R A. Military Service Number or Last Known Location: NX69721. Missing, Wounded and Prisoner of War Enquiry Card Index Number: 13471.234186
Item: [2016.0049.46920] "Rudd, R A, NX69721
Marriage record of Byrum, George R. and Rudd, Bessie D.
No full textMarriage license for George R. Byrum and Bessie D. Rudd. W.C. McCall was the officiant
The Autobiography of Dr. Russell R. Rudd (1898-1998): From Memoirs Written in 1989, Chapter II
Full text linkThe Autobiography of Dr. Russell R. Rudd (1898-1998): From Memoirs Written in 1989, Chapter II
Dr. Russell R. Rud
The Autobiography of Dr. Russell R. Rudd (1898-1998) From Memoirs Written in 1989, Chapter I
Full text linkThe Autobiography of Dr. Russell R. Rudd (1898-1998) From Memoirs Written in 1989, Chapter I
Dr. Russell R. Rud
[The Steele Rudd Amateur Dramatic Company] [picture] .
No full textCondition : Fair, some flaking and marks.; Title from caption on compactus card.; "Rudd, Steele, The Steele Rudd Amateur Dramatic Company, formed in Toowoomba in 1915 - produced his play 'Duncan McClure', formed to raise funds for patriotic purposes" --Compactus card. Members of company: back row left to right: R. Dibley, B. Bunny, R. O'Connor, L. Hopkins [?], J.R. Nolan, G. Barlow, K. McKinney, A. Drew, L. Wilkinson, J. McMaster. Middle row: A. Black, Miss J. Groom, R.A. Elliott, A.H. Davis (Steele Rudd), Mrs V. Yaldwin, M. McWaters [?]. Front row: Miss E. Shepherd [?], Miss V. Yaldwin, Miss E. Dayley, Miss G. Warren
Letter (page 9- 10) to R. Meyler from G. Rudd
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/239660Re: thanks for kindness to my spouse.129747
Sub-Item: [1980.0075.04679] "Letter (page 9- 10) to R. Meyler from G. Rudd
Letter (page 1-5) to R. Meyler from G. Rudd
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/239658Re: Family financial matters.129745
Sub-Item: [1980.0075.04677] "Letter (page 1-5) to R. Meyler from G. Rudd
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