Variability in the foraging range of <i>Eudyptula minor</i> across breeding sites in central New Zealand

Poupart, Timothée; Waugh, Susan M.; Bost, CA; Bost, Charles‐André; Dennis, Todd E.; Lane, Reuben; Rogers, Karyne M.; Sugishita, Junichi; Taylor, Graeme A.; Wilson, Kerry‐Jayne; Zhang, Jingjing; Arnould, John P. Y.

doi:10.1080/03014223.2017.1302970

Cited by 16 publications

(18 citation statements)

References 73 publications

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“…Additional research is needed to resolve land-based and fisheries threats to the species. The stability of the Westland Petrel's core foraging areas makes it possible to institute marine spatial management to reduce adverse impacts of fishing or seabed mining on multiple threatened endemic top marine predators in the region (e.g., Bräger and Schneider 1998, Walker and Elliott 2006, Poupart et al 2017, such as through the implementation of marine reserves or restrictions on damaging activities (BirdLife International 2009, Department of Conservation and Ministry of Fisheries 2011, . Such areas will need to be at a scale that will cover key habitat requirements to be effective.…”

Section: Discussionmentioning

confidence: 99%

Environmental factors and fisheries influence the foraging patterns of a subtropical seabird, the Westland Petrel (Procellaria westlandica), in the Tasman Sea

et al. 2018

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Environmental and anthropogenic influences in the marine environment are primary drivers of behavior and demographic outcomes for marine birds. We examined factors influencing the foraging patterns of the Westland Petrel (Procellaria westlandica), a highly threatened, endemic petrel that inhabits subtropical water masses primarily in the Tasman Sea, with a poorly known at-sea distribution. Risk assessments place the species at moderate risk of population impacts from fisheries-related mortality. Studies in the 1990s indicated that trawl fisheries would have an important influence on the Westland Petrel's foraging behavior. We investigated the influence of climatic conditions, marine productivity, bathymetry, the core fishery zone, concurrent fishing activity, light conditions, sex, and breeding stage on Westland Petrel foraging patterns. We analyzed the stable isotopes of carbon and nitrogen from blood sampled during the incubation period and examined changes in isotopic niche width over a 6-yr period. We found that the Westland Petrel's foraging zone varied only slightly between years and that the location of intensively used areas was strongly influenced by bathymetric slope and latitude, and negatively influenced by chlorophyll-a. The core fishery zone had a secondary influence, suggesting that these petrels co-occur with fisheries, but are not dependent on waste for food. Trophic niche width was significantly wider during strong El Niño conditions, indicating that food type, rather than location, was most affected by climatic variation. Consistent use of one marine area across varying times and conditions increases the risk of adverse effects of climate or human-induced impacts on the species. However, marine spatial management tools become viable in these conditions. Further, with rapid increases in sea surface temperatures and extreme values recorded in the region in recent periods, changes to fisheries zones and distributions of natural prey of the species are likely to occur and may change the population's sustainability. Direct all requests to reproduce journal content to the AOS Publications Office at pubs@americanornithology.org que les pétrels cohabitent avec les activités de pêche mais ne sont pas dépendants des rejets de pêche pour s'alimenter. Les niches trophiquesétaient significativement plus larges lorsque fortes dans des conditions El Niño, ce qui indique que le type de nourriture, plutôt que la localisation,était le plus affecté par la variation du climat. Une utilisation continue d'une zone marineà différents moments et dans diverses conditions augmente le risque d'impacts climatiques ou anthropiques négatifs sur l'espèce. Cependant, les outils de gestion spatiale du milieu marin deviennent viables dans ces conditions. De plus, avec de rapides augmentations de la SST et des valeurs extrêmes enregistrées dans la région récemment, des changements aux zones de pêches et dans la répartition naturelle des proies de l'espèce sont susceptibles de se produire et peuvent affecter la pérennité de la po...

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Section: Discussionmentioning

confidence: 99%

Environmental factors and fisheries influence the foraging patterns of a subtropical seabird, the Westland Petrel (Procellaria westlandica), in the Tasman Sea

et al. 2018

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“…Other influences that need consideration include water and wind movement (e.g. currents, eddies or upwellings) that can enhance nutrients and productivity in an area (Torres 2013;Poupart et al 2017). Both Pearl and Motuara Islands are located in areas with strong currents and tidal and upwelling movements, which are likely to provide potential differences in prey abundance and distribution (Chiswell 1995).…”

Section: Discussionmentioning

confidence: 99%

“…Foraging behaviour during incubation and chick rearing (including diving behaviour, foraging range and trip length) impacts the reproductive success of little blue penguins (Dann et al 2000;Nisbet & Dann 2009;Chiaradia et al 2010). Poupart et al (2017) undertook foraging location research on Motuara Island little blue penguins contemporaneously with this study in 2014, and again in 2015. They reported significant differences in foraging range and area between individuals, breeding stages (incubation vs chick rearing, with foraging range and trip distances being significantly greater during incubation) and years during the chick rearing stage.…”

Section: Foraging Behaviour and Reproductive Successmentioning

confidence: 99%

“…Penguin foraging ranges are generally reduced during the breeding period, particularly when provisioning chicks, as they must return to land to brood and feed offspring on a regular basis. It is commonly thought that individuals rely on the availability of prey within close proximity of their nesting site (Chiaradia et al 2007;Ropert-Coudert et al 2009;McCutcheon et al 2011); however, recent research in New Zealand indicates that during incubation foraging distances can be quite extensive (Poupart et al 2017). If little blue penguins are reliant on near-shore marine ecosystems with variable productivity (prey availability) during chick rearing, there is likely to be immediate impacts on penguin breeding success and possibly flow-on effects in population size and distribution (Boersma 2008).…”

Section: Introductionmentioning

confidence: 99%

“…Their foraging ranges also vary significantly between locations and in some areas between breeding stages (i.e. incubation compared with chick rearing; Poupart et al 2017). In New Zealand, little blue penguins are visual predators, foraging predominantly on squid (Nototodarus spp.)…”

Section: Introductionmentioning

confidence: 99%

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Variability of little blue penguin (Eudyptula minor) diving behaviour across New Zealand

Chilvers¹

2019

NZJE

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Foraging strategies of penguin species can vary according to the quality of the marine environment, and this influences their abundance and breeding success. Little blue penguins (Eudyptula minor) are considered a candidate species for assessing near-shore marine productivity due to their usually limited foraging ranges and reliance on local resources, particularly while rearing chicks. Understanding the variability of little blue penguins diving behaviours will inform whether the species can be used as an environmental monitor. This research investigates diving behaviours and feather stable isotope values (as indicators of diet) of little blue penguins from Motuara Island, Marlborough Sounds, New Zealand, and compares them with little blue penguins from three other locations distributed across the country. The diving behaviour of little blue penguins, including dive depth and duration, were highly variable indicating that little blue penguins are an environmentally adaptable species. Because of the highly variable marine environments they inhabit, the use of little blue penguins as local monitors of New Zealand's changing marine environment requires an understanding of area and population specific diving and foraging behaviour.

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Shallow divers, deep waters and the rise of behavioural stochasticity

et al. 2017

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Variability in the foraging range of Eudyptula minor across breeding sites in central New Zealand

Cited by 16 publications

References 73 publications

Environmental factors and fisheries influence the foraging patterns of a subtropical seabird, the Westland Petrel (Procellaria westlandica), in the Tasman Sea

Environmental factors and fisheries influence the foraging patterns of a subtropical seabird, the Westland Petrel (Procellaria westlandica), in the Tasman Sea

Variability of little blue penguin (Eudyptula minor) diving behaviour across New Zealand

Shallow divers, deep waters and the rise of behavioural stochasticity

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