Predictive habitat modelling for the population census of a burrowing seabird: A study of the endangered Cook’s petrel

Rayner, Matt J.; Clout, Mick N.; Stamp, Rosalie K.; Imber, Michael J.; Brunton, Dianne H.; Hauber, Márk E.

doi:10.1016/j.biocon.2007.04.021

Cited by 42 publications

(55 citation statements)

References 38 publications

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“…More detailed classification of vegetation at finer spatial scales might have improved our model fits. So why did Rayner et al (2007) find improvement in estimates from spatial modelling whereas we did not? Possible explanations include ecological and social differences, or differences in crowding between the study populations, but more studies employing similar spatial modelling techniques are required before any generalisations about their efficacy will emerge.…”

Section: Potential Spatial Auto-correlation Effects On Population Estmentioning

confidence: 99%

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Predictive habitat modelling to estimate petrel breeding colony sizes: Sooty shearwaters (Puffinus griseus) and mottled petrels (Pterodroma inexpectata) on Whenua Hou Island

Scott

Møller²,

Fletcher

et al. 2009

New Zealand Journal of Zoology

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to predict the presence of a colony, and a normal general linear model was used to predict the density of entrances within colonies. Aerial photography, GIS and a Digital Elevation Model were used to extract relevant habitat and location variables, and a combination of both regression models was used to predict the density of breeding burrows within each 5.32 m 2 pixel on the island. This complex GIS and habitat prediction modelling approach gave population estimates very similar to a more traditional simple area extrapolation method and gave no improvement in precision. However, correction for the slope of the land increased our simple area estimates of population size by 11%. We estimate populations of sooty shearwater and mottled petrel breeding pairs at 173 000 (162 000-190 000) and 160 000 (123 000-197 000) respectively. Based on this number of breeding pairs, we calculate that Whenua Hou supports a total population of 868 000 (554 000-1 270 000) sooty shearwaters. Our estimate of the total mottled petrel population 202 000 pairs (162 000-242 000) is comparable with the only published estimate, but could be an underestimate because mottled petrels are sometimes found in large burrows. More research for robust estimation of population trends is needed to assess the conservation status of mottled petrels.

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Section: Potential Spatial Auto-correlation Effects On Population Estmentioning

confidence: 99%

“…36 cuthbert 2004. extensive surveys of burrow-nesting species are further hampered by the lack of reliable tools for detecting and identifying burrow occupants (ramos et al 1997;Hamilton 1998;Mckechnie et al 2007;rayner et al 2007).…”

Section: Introductionmentioning

confidence: 99%

Predictive habitat modelling to estimate petrel breeding colony sizes: Sooty shearwaters (Puffinus griseus) and mottled petrels (Pterodroma inexpectata) on Whenua Hou Island

Scott

Møller²,

Fletcher

et al. 2009

New Zealand Journal of Zoology

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“…Positive relationships between colony size and area of foraging grounds, maximum foraging range, foraging trip duration and provisioning rate have been demonstrated in a range of colonial seabirds, with resource depletion and increased interference competition close to the colonies assumed to be driving this process (Lewis et al 2001, Ainley et al 2003, 2004. Data for Cook's petrel are inconsistent with this hypothesis, as maximum foraging ranges of birds at LBI were significantly shorter than those at CDF, despite a population sizẽ 50 times greater (286 000 breeding pairs at LBI vs. 6000 breeding pairs at CDF; Rayner et al 2007cRayner et al , 2008. Two non-exclusive explanations could account for this discrepancy.…”

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confidence: 99%

Foraging ecology of the Cook’s petrel Pterodroma cookii during the austral breeding season: a comparison of its two populations

Rayner¹,

Hauber²,

Clout³

et al. 2008

Mar. Ecol. Prog. Ser.

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This study examined divergence in the foraging distribution, at-sea behaviour and provisioning strategies of a small procellarid, the Cook's petrel Pterodroma cookii, during chick-rearing at 2 islands off New Zealand, separated latitudinally by ~1000 km. There was little overlap in foraging distribution between adults from Little Barrier Island (LBI), which ranged to the west into the Northern Tasman Sea and east into the Pacific Ocean, and conspecifics from Codfish Island (CDF), which foraged west of the South Island in the south Tasman Sea in association with the subtropical convergence zone. Although birds from CDF ranged further than those from LBI, there was no difference in mean foraging trip duration. Cook's petrels from CDF foraged over deeper, cooler water, with higher primary productivity, than conspecifics from LBI. At-sea behaviour also differed: adults from LBI spent less time in flight, and showed less variation in total flight time per day. Overall, Cook's petrels spend much more time in flight than albatrosses, and approximately the same amounts of time on the water during the night as during the day, suggesting a high portion of nocturnal foraging. Dive depths did not differ between colonies but were greater than expected for a gadfly petrel. Stable isotope signatures of blood indicated population-specific diets, and suggested that birds from LBI primarily consume cephalopods and fish, whereas those from CDF eat more crustaceans. Chicks at CDF received more food. These results suggest a broad divergence in foraging strategies between geographically well-separated colonies in response to regional differences in oceanography. KEY WORDS: Foraging distribution · Geolocation loggers · Stable isotopes · Subtropical convergence · Gadfly petrel Resale or republication not permitted without written consent of the publisherMar Ecol Prog Ser 370: [271][272][273][274][275][276][277][278][279][280][281][282][283][284] 2008 ever, there have been relatively few studies of highly pelagic species from more widely separated populations, where there is nonetheless the potential for some overlap and interaction at sea. Such comparisons are particularly interesting given the potential for genetic isolation between populations, as most seabirds display a high degree of natal philopatry (Warham 1996). In addition, the high degree of behavioural flexibility of adults may also lead to divergence in foraging strategies, particularly between distant colonies in dissimilar oceanographic domains.Until recently, owing to the relatively large size of the available technology, detailed studies on the movements of pelagic seabirds had been restricted to medium to large species to which attachment of equipment was feasible without impacting the animal's behaviour (Weimerskirch et al. 1993, Stahl & Sagar 2000a. Information on the distribution and behaviour of smaller species (< 300 g) at sea was therefore restricted to band recoveries (Patterson & Hunter 2000) and shipboard observations (Bartle et al. 1990). However,...

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“…Although some species congregate in relatively discrete areas (e.g. Rayner et al 2007, Stevick et al 2008, challenges arise when estimating abundance for species that undertake extensive seasonal migrations and range over large, poorly defined areas. For long-lived, slow-breeding species with large home ranges, such as baleen whales, there are several challenges to estimating abundance, especially when managing recovering populations (Hammond 1990, Stevick et al 2003.…”

Section: Introductionmentioning

confidence: 99%

Abundance of humpback whales in Oceania using photo-identification and microsatellite genotyping

Constantine¹,

Jackson²,

Steel³

et al. 2012

Mar. Ecol. Prog. Ser.

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Estimating the abundance of long-lived, migratory animals is challenging but essential for managing populations. We provide the first abundance estimates of endangered humpback whales Megaptera novaeangliae from their breeding grounds in Oceania, South Pacific. Using fluke photo-identification (1999−2004, n = 660 individuals) and microsatellite genotypes (1999−2005, n = 840 individuals), we estimated abundance with open capture-recapture statistical models. Total Oceania abundance and trends were estimated from 4 primary and 5 secondary sampling sites across the region. Sex-specific genotype data enabled us to account for the difference in capturability of males and females, by doubling male-specific estimates of abundance derived from genotypes. Abundance estimates were congruent between primary-and secondaryregion data sets, suggesting that the primary regions are representative of all Oceania. The best estimate of total abundance was 4329 whales (3345−5313) in 2005, from a sex-specific POPAN super-population model, which includes resident whales and those migrating through the surveyed areas. A doubled-male POPAN abundance estimate from 2003 (n = 2941, 95% CI = 1648−4234) was considered the most plausible for the 4 primary survey areas and was similar to the 2003 doubled-male estimate derived from Pradel capture probabilities (n = 2952, 95% CI = 2043−4325). Our results confirm that Oceania is the least abundant humpback whale breeding population in the southern hemisphere. Pradel models showed no significant trend in abundance, which contradicts the recovery seen in most other populations throughout the world. Thus we suggest that the whales in this area warrant continued study and management attention.KEY WORDS: Megaptera novaeangliae · South Pacific · Capture-recapture · Genotyping · Endangered speciesResale or republication not permitted without written consent of the publisher

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Predictive habitat modelling for the population census of a burrowing seabird: A study of the endangered Cook’s petrel

Cited by 42 publications

References 38 publications

Predictive habitat modelling to estimate petrel breeding colony sizes: Sooty shearwaters (Puffinus griseus) and mottled petrels (Pterodroma inexpectata) on Whenua Hou Island

Predictive habitat modelling to estimate petrel breeding colony sizes: Sooty shearwaters (Puffinus griseus) and mottled petrels (Pterodroma inexpectata) on Whenua Hou Island

Foraging ecology of the Cook’s petrel Pterodroma cookii during the austral breeding season: a comparison of its two populations

Abundance of humpback whales in Oceania using photo-identification and microsatellite genotyping

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