Výsledky vyhledávání - "S. L. Petersen"

Recent trends in numbers of four species of penguins at the Prince Edward Islands

Autor: Peter G. Ryan, PA Whittington, R Jm Crawford, Bruce M. Dyer, S. L. Petersen, L Upfold, John Cooper

Publikováno v: African Journal of Marine Science; Vol 31, No 3 (2009)

Four species of penguin breed regularly at South Africa’s Prince Edward Islands: king penguin Aptenodytes patagonicus, gentoo penguin Pygoscelis papua, macaroni penguin Eudyptes chrysolophus and southern rockhopper penguin E. chrysocome. In Decembe

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::d171d553ab89ef5733d66b49399cc07c
https://doi.org/10.2989/ajms.2009.31.3.14.1002

Zobrazit plný text záznamu

Overlap between vulnerable top predators and fisheries in the Benguela upwelling system: implications for marine protected areas

Autor: J. J. van der Westhuizen, CD van der Lingen, David Grémillet, Sue Lewis, Peter G. Ryan, Lorien Pichegru, C. Le Bohec, Rene A. Navarro, S. L. Petersen

Publikováno v: Pichegru, L, Ryan, P G, Le Bohec, C, van der Lingen, C D, Navarro, R, Petersen, S, Lewis, S, van der Westhuizen, J & Gremillet, D 2009, ' Overlap between vulnerable top predators and fisheries in the Benguela upwelling system: implications for marine protected areas ', Marine Ecology Progress Series, vol. 391, pp. 199-208 . https://doi.org/10.3354/meps08283

Industrial-scale fisheries are often thought to reduce food availability for top predators. It is essential to estimate the spatial and temporal overlap over a fine scale between fisheries and pre- dators during their breeding season, when their ener

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::ba9691ecaed0cb8a3fc776759a8719ad
https://doi.org/10.3354/meps08283

Zobrazit plný text záznamu

Interactions between seabirds and deep-water hake trawl gear: an assessment of impacts in South African waters

Autor: B. P. Watkins, S. L. Petersen, Peter G. Ryan

Publikováno v: Animal Conservation. 11:247-254

Many seabirds are killed or injured by fishing gear, contributing to the high proportion of threatened seabirds. This study estimates the impact of the South African deep-water hake Merluccius spp. trawl fishery on seabirds. At least 30 birds were ki

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::61a56af6d3ed9c03c30d591a6573ed7a
https://doi.org/10.1111/j.1469-1795.2008.00192.x

Zobrazit plný text záznamu

Reducing bycatch in the South African pelagic longline fishery: the utility of different approaches to fisheries closures

Autor: S. L. Petersen, Hugh P. Possingham, Hedley S. Grantham

Publikováno v: Endangered Species Research. 5:291-299

Seabirds, turtles and sharks are often of conservation concern because they are frequently bycatch in fisheries. Fisheries managers shifting from a target species focus to an ecosystem-based approach are being required to consider the impact of fishe

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::a8735e981999e27f11c7c48eedffd805
https://doi.org/10.3354/esr00159

Zobrazit plný text záznamu

Revegetation Methods for High-Elevation Roadsides at Bryce Canyon National Park, Utah

Autor: S L Petersen, Raymond L. Bryant, Bruce A. Roundy

Publikováno v: Restoration Ecology. 12:248-257

Establishment of native plant populations on disturbed roadsides was investigated at Bryce Canyon National Park (BCNP) in relation to several revegetation and seedbed preparation techniques. In 1994, the BCNP Rim Road (2,683–2,770 m elevation) was

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::0b40514316974e0272edfd32ce16387d
https://doi.org/10.1111/j.1061-2971.2004.00321.x

Zobrazit plný text záznamu

Decrease in Numbers of the Eastern Rockhopper PenguinEudyptes Chrysocome Filholiat Marion Island, 1994/95–2002/03

Autor: John Cooper, Deon Nel, S. L. Petersen, N. T. W. Klages, A. C. Wolfaardt, Jeanne L. Nel, R. J. M. Crawford, B. M. Dyer, M. D. Greyling

Publikováno v: African Journal of Marine Science. 25:487-498

The number of eastern rockhopper penguins Eudyptes chrysocome filholi breeding at subantarctic Marion Island decreased from about 173 000 pairs in 1994/95 to about 67 000 pairs in 2001/02. During 1994/95–2002/03 pairs fledged on average 0.40 chicks

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::7222da4fa29ac9fc1a78df81497310b6
https://doi.org/10.2989/18142320309504037

Zobrazit plný text záznamu

Population, Breeding, Diet and Conservation of the Crozet ShagPhalacrocorax [atriceps] Melanogenisat Marion Island, 1994/95–2002/03

Autor: D. G. Keith, Jeanne L. Nel, M. D. Greyling, C. L. Holness, B. Hanise, A. C. Wolfaardt, B. M. Dyer, R. J. M. Crawford, M. Du Toit, K. Spencer, D. Tshingana, S. L. Petersen, John Cooper

Publikováno v: African Journal of Marine Science. 25:537-547

The number of Crozet shags or cormorants Phalacrocorax [atriceps] melanogenis breeding at subantarctic Marion Island decreased by 68% from 841 pairs in 1994/95 to 272 pairs in 2002/03. The mean number of pairs at colonies also decreased and was signi

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::54f14d8af7f2406d5ab37bd3928b89b1
https://doi.org/10.2989/18142320309504043

Zobrazit plný text záznamu

Nest Densities of the Wandering AlbatrossDiomedea Exulansat the Prince Edward Islands, Estimated Using Gps

Autor: John Cooper, S. L. Petersen, Les G. Underhill

Publikováno v: African Journal of Marine Science. 25:529-535

Hand-held Global Positioning System (GPS) receivers provide opportunities for detailed and rapid mapping of features, including biological ones, further enhanced by the removal during 2000 of “selective availability”. GPS was used to map, describ

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::b839013ccdfec07c5ac0f0d4e974d463
https://doi.org/10.2989/18142320309504042

Zobrazit plný text záznamu

Absence of Haematozoa in Breeding MacaroniEudyptes Chrysolophusand RockhopperE. ChrysocomePenguins at Marion Island

Autor: S. L. Petersen, A. Schultz

Publikováno v: African Journal of Marine Science. 25:499-502

Haematozoan infections cause the death of penguins in captivity, but seldom in the wild. No haematozoa were found in 89 blood smears taken from macaroni penguins Eudyptes chrysolophus or 80 smears from eastern rockhopper penguins E. chrysocome filhol

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::c525e9797e2f2e2366155215a13f9087
https://doi.org/10.2989/18142320309504038

Zobrazit plný text záznamu

Vyhledávací nástroje:

Upřesnit hledání