A5027899657- Avian ecology and behavior
- Marine and fisheries research
- Marine animal studies overview
- Animal Behavior and Reproduction
- Marine and coastal plant biology
- Fish Ecology and Management Studies
- Animal Vocal Communication and Behavior
- Coral and Marine Ecosystems Studies
- Bird parasitology and diseases
- Coastal and Marine Management
- Wildlife Ecology and Conservation
- Microplastics and Plastic Pollution
- Plant and animal studies
- Recycling and Waste Management Techniques
- Isotope Analysis in Ecology
- Species Distribution and Climate Change
- Climate variability and models
- Ecology and Vegetation Dynamics Studies
- Animal and Plant Science Education
- Orthoptera Research and Taxonomy
- Scientific Computing and Data Management
- Arctic and Russian Policy Studies
- Music and Audio Processing
- Underwater Acoustics Research
- Marine Biology and Environmental Chemistry
Nelson Mandela University
2015-2024
University of Cape Town
2008-2024
Google (United States)
2021
National Research Foundation
2013-2020
FitzPatrick Institute of African Ornithology
2014
Centre National de la Recherche Scientifique
2006-2009
Centre d'Écologie Fonctionnelle et Évolutive
2008
Éco-Anthropologie
2006
Worldwide fisheries generate large volumes of fishery waste and it is often assumed that this additional food beneficial to populations marine top-predators. We challenge concept via a detailed study foraging Cape gannets Morus capensis their feeding environment in the Benguela upwelling zone. The natural prey (pelagic fishes) depleted birds now feed extensively on wastes. These are non-breeding birds, which show reduced effort high survival. By contrast, breeding double diving an attempt...
No-take zones may protect populations of targeted marine species and restore the integrity ecosystems, but it is unclear whether they benefit top predators that rely on mobile pelagic fishes. In South Africa, foraging effort breeding African penguins decreased by 30 per cent within three months closing a 20 km zone to competing purse-seine fisheries around their largest colony. After fishing ban, most from this island had shifted feeding inside closed area. Birds at another colony situated...
The number of African penguins Spheniscus demersus breeding in South Africa collapsed from about 56 000 pairs 2001 to some 21 2009, a loss 35 (>60%) eight years. This reduced the global population 26 pairs, when including Namibian breeders, and led classification species as Endangered. In Africa, breed two regions, Western Cape Algoa Bay (Eastern Cape), their localities these regions being separated by c. 600 km. Their main food is anchovy Engraulis encrasicolus sardine Sardinops sagax,...
Global forage-fish landings are increasing, with potentially grave consequences for marine ecosystems. Predators of forage fish may be influenced by this harvest, but the nature these effects is contentious. Experimental fishery manipulations offer best solution to quantify population-level impacts, rare. We used Bayesian inference examine changes in chick survival, body condition and population growth rate endangered African penguins Spheniscus demersus response 8 years alternating...
In the context of marine anthropogenic debris management, monitoring is essential to assess whether mitigation measures reduce amounts waste plastic entering environment are being effective. South Africa, baselines against which changes can be assessed include data from 1970s 1990s on microplastics floating at sea, macro- and microplastic beach debris, interactions with biota. However, detecting in abundance sea complicated by high spatial temporal heterogeneity net samples. Beach easier...
To support sustainable growth of ocean-based economies, many countries are engaging in marine spatial planning (MSP) processes, which require robust decision-support tools. Systematic conservation (SCP) is commonly used decision-making to guide spatially efficient protected area expansion. Here we contend that SCP can also be streamline MSP negotiations by developing a coherent, integrated portfolio sites for multiple sectors depend on biodiversity being maintained good state, as...
MEPS Marine Ecology Progress Series Contact the journal Facebook Twitter RSS Mailing List Subscribe to our mailing list via Mailchimp HomeLatest VolumeAbout JournalEditorsTheme Sections 350:127-136 (2007) - DOI: https://doi.org/10.3354/meps07128 Foraging behaviour and energetics of Cape gannets Morus capensis feeding on live prey fishery discards in Benguela upwelling system Lorien Pichegru1,2,*, Peter G. Ryan2, Carl D. van der Lingen3, Janet Coetzee3, Yan Ropert-Coudert4, David Grémillet1,2...
MEPS Marine Ecology Progress Series Contact the journal Facebook Twitter RSS Mailing List Subscribe to our mailing list via Mailchimp HomeLatest VolumeAbout JournalEditorsTheme Sections 391:199-208 (2009) - DOI: https://doi.org/10.3354/meps08283 Overlap between vulnerable top predators and fisheries in Benguela upwelling system: implications for marine protected areas L. Pichegru1,2,*, P. G. Ryan2, C. Le Bohec1, D. van der Lingen3,4, R. Navarro4,5, S. Petersen2, Lewis6, J. Westhuizen3,...
Breeding Spheniscus penguins are central place foragers that feed primarily on schooling pelagic fish. They visual hunters, but it is unclear how they locate prey patches a coarse scale. Many petrels and storm (Procellariiformes), the penguins' closest relatives, use olfactory cues to concentrations at sea, this has not been demonstrated for penguins. Procellariiforms attracted variety of cues, including dimethyl sulphide (DMS), an organosulphur compound released when phytoplankton grazed,...
Marine piscivores have evolved a variety of morphological and behavioural adaptations, including group foraging, to optimize foraging efficiency when targeting shoaling fish. For penguins that are known associate at sea feed on these prey resources, there is nonetheless lack empirical evidence support improved with conspecifics. We examined the hunting strategies performance breeding African equipped animal-borne video recorders. Individuals pursued both solitary as well schooling pelagic...
Seismic surveys in search for oil or gas under the seabed, produce most intense man-made ocean noise with known impacts on invertebrates, fish and marine mammals. No evidence to date exists, however, about potential seabirds. Penguins may be expected particularly affected by loud underwater sounds, due their largely aquatic existence. This study investigated behavioural response of breeding endangered African Spheniscus demersus seismic within 100 km colony South Africa, using a multi-year...
Abstract Understanding changes in abundance is crucial for conservation, but population growth rates often vary over space and time. We use 40 years of count data (1979–2019) Bayesian state‐space models to assess the African penguin Spheniscus demersus under IUCN Red List Criterion A. deconstruct overall decline time identify where urgent conservation action needed. The global met threshold Endangered with a high probability (97%), having declined by almost 65% since 1989. An historical low...
In the mid 1970s, breeding populations of migrant White Stork Ciconia ciconia were close to extinction in northeastern region France (Alsace). A re‐introduction project was implemented, resulting year‐round settlement some individuals region, which rely on additional food supplied by humans during winter. Today, both resident and birds breed same areas take from rubbish dumps (farmers). The effects these anthropogenic influences, altering behaviour, reproductive success are not known. aim...
Summary Climate change and fishing impact marine ecosystems, potentially modifying the availability of small pelagic fish to top predators. Some seabirds that primarily rely upon these resources have switched feeding on fishery waste. It has therefore been argued might become dependent this artificial resource. To test hypothesis, we studied foraging behaviour Cape gannets M orus capensis breeding off coast South Africa using high‐resolution Global Positioning System‐tracking in relation...
MEPS Marine Ecology Progress Series Contact the journal Facebook Twitter RSS Mailing List Subscribe to our mailing list via Mailchimp HomeLatest VolumeAbout JournalEditorsTheme Sections 505:281-293 (2014) - DOI: https://doi.org/10.3354/meps10762 Changes in prey availability impact foraging behaviour and fitness of Cape gannets over a decade Lea A. Cohen1,*, Lorien Pichegru2,3, David Grémillet1,4, Janet Coetzee5, Leshia Upfold6, Peter G. Ryan1 1DST/NRF Centre Excellence at Percy FitzPatrick...
Abstract Ecosystem‐based management of fisheries aims to allow sustainable use fished stocks while keeping impacts upon ecosystems within safe ecological limits. Both the FAO Code Conduct for Responsible Fisheries and Aichi Biodiversity Targets promote these aims. We evaluate implementation ecosystem‐based in six case‐study which potential indirect bird or mammal predators are well publicized studied. In particular, we consider components needed enable strategies respond information from...
ESR Endangered Species Research Contact the journal Facebook Twitter RSS Mailing List Subscribe to our mailing list via Mailchimp HomeLatest VolumeAbout JournalEditorsSpecials 19:255-264 (2013) - DOI: https://doi.org/10.3354/esr00477 Sex-specific foraging behaviour and a field sexing technique for African penguins L. Pichegru1,*, T. Cook1, J. Handley2, N. Voogt2, Watermeyer2, Nupen1, C. D. McQuaid2 1DST/NRF Centre of Excellence at Percy FitzPatrick Institute, University Cape Town, Rondebosch...
In 2016, South Africa became the first African country to draft Marine Spatial Planning (MSP) legislation. The underlying legal framework supports achievement of ecological, social and economic objectives, but a national policy grow oceans economy provides challenge for ecosystem-based approaches MSP. During 2018 International Conservation Congress in Borneo, we convened special session discuss particular challenges that will likely apply any developing seeking increase profits from...