Clustering of colonies in an expanding population of New Zealand fur seals (Arctocephalus forsteri)

Bradshaw, Corey J. A.; Lalas, Chris; Thompson, Caryn M.

doi:10.1017/s0952836900001096

Cited by 14 publications

(29 citation statements)

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“…Also, recently established colonies and those on the boundaries of the range may exhibit different demographic parameters and different trends than longer established colonies in the centre of the range [85]. These are all factors that may influence the contrasting trends that were evident between colonies (Tables 4 and 5, Fig 2).…”

Section: Discussionmentioning

confidence: 99%

Understanding meta-population trends of the Australian fur seal, with insights for adaptive monitoring

et al. 2018

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Effective ecosystem-based management requires estimates of abundance and population trends of species of interest. Trend analyses are often limited due to sparse or short-term abundance estimates for populations that can be logistically difficult to monitor over time. Therefore it is critical to assess regularly the quality of the metrics in long-term monitoring programs. For a monitoring program to provide meaningful data and remain relevant, it needs to incorporate technological improvements and the changing requirements of stakeholders, while maintaining the integrity of the data. In this paper we critically examine the monitoring program for the Australian fur seal (AFS) Arctocephalus pusillus doriferus as an example of an ad-hoc monitoring program that was co-ordinated across multiple stakeholders as a range-wide census of live pups in the Austral summers of 2002, 2007 and 2013. This 5-yearly census, combined with historic counts at individual sites, successfully tracked increasing population trends as signs of population recovery up to 2007. The 2013 census identified the first reduction in AFS pup numbers (14,248 live pups, -4.2% change per annum since 2007), however we have limited information to understand this change. We analyse the trends at breeding colonies and perform a power analysis to critically examine the reliability of those trends. We then assess the gaps in the monitoring program and discuss how we may transition this surveillance style program to an adaptive monitoring program than can evolve over time and achieve its goals. The census results are used for ecosystem-based modelling for fisheries management and emergency response planning. The ultimate goal for this program is to obtain the data we need with minimal cost, effort and impact on the fur seals. In conclusion we identify the importance of power analyses for interpreting trends, the value of regularly assessing long-term monitoring programs and proper design so that adaptive monitoring principles can be applied.

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Section: Discussionmentioning

confidence: 99%

Understanding meta-population trends of the Australian fur seal, with insights for adaptive monitoring

et al. 2018

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“…Oosthuizen and David 1988, Bradshaw et al 2000, Grandi et al 2008. The establishment has been attributed to saturation of spaceat-source breeding colonies (e.g.…”

Section: Discussionmentioning

confidence: 99%

“…The establishment has been attributed to saturation of spaceat-source breeding colonies (e.g. Bradshaw et al 2000, Grandi et al 2008), but another possible cause includes the convenience of haulout sites with respect to feeding grounds.…”

Section: Discussionmentioning

confidence: 99%

Recolonisation of the Robberg Peninsula (Plettenberg Bay, South Africa) by Cape fur seals

Huisamen

Kirkman

Watson

et al. 2011

African Journal of Marine Science

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The Cape fur seal Arctocephalus pusillus pusillus colony at Robberg Peninsula, Plettenberg Bay, on the south-east coast of South Africa, was driven to extinction by indiscriminate harvesting by the late 1800s. Seals only began to recolonise this site in the 1990s. This study describes the recolonisation process from 2000 to 2009, exploring both within-and between-year count data of seals using the site. Counts increased over the study period from <300 animals to >3 100. Generalised linear models indicated the importance of year and month in explaining variability in the counts. Withinyear variability in the counts decreased over the study period, which may be related to an increasing proportion of resident (as opposed to transient) seals in the colony. However, the colony is currently still in a transition phase with a low ratio of breeding to non-breeding animals, based on the low numbers of pups born in the colony (currently still <100 per year). The influx of seals to the Robberg area may be associated with shifts in prey availability at the ecosystem level. The colony benefits from the protection afforded by the reserve status of the Robberg Peninsula and the existence of a marine protected area adjacent to it. However, human interference associated with fishing and/or ecotourism on the peninsula may inhibit development into a substantial breeding colony. Potential interventions for the conservation and management of this colony are discussed.

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“…In New Zealand, wildlife biologists fully expect that fur seal breeding grounds will eventually be re-established across New Zealand, as human-related declines have been significantly mitigated (e.g., Bradshaw et al 2000Bradshaw et al , 2002. Given this outlook, it would be useful to know the locations of prehistoric rookeries so that conservation efforts can be focused at these specific localities.…”

Section: Applied Zooarchaeology: Wildlife Conservationmentioning

confidence: 99%

Antipodean Perspectives on Zooarchaeology: Behavioral Ecology, Taphonomy, and Applied Research

Nagaoka

Allen

2009

The Journal of Island and Coastal Archaeology

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Zooarchaeological research in New Zealand has a particularly long history, dating from the 1870s. Over the last century, it has both followed larger trends in the discipline and developed innovative approaches. Three types of research that reflect these broader movements and novel approaches are identified in this historical review of New Zealand archeofaunal studies. First, zooarchaeological studies have been used to not only illustrate human impacts on the environment, but also to examine the consequences of anthropogenic environmental change for resident human populations. Second, taphonomic research, beginning with Julius von Haast's qualitative examinations of moahunter butchering patterns, is considered, particularly studies relating to butchery and carnivore damage. Finally, examples of New Zealand research that are poised to make significant contributions to the burgeoning field of applied zooarchaeology are highlighted.

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Clustering of colonies in an expanding population of New Zealand fur seals (Arctocephalus forsteri)

Cited by 14 publications

References 0 publications

Understanding meta-population trends of the Australian fur seal, with insights for adaptive monitoring

Understanding meta-population trends of the Australian fur seal, with insights for adaptive monitoring

Recolonisation of the Robberg Peninsula (Plettenberg Bay, South Africa) by Cape fur seals

Antipodean Perspectives on Zooarchaeology: Behavioral Ecology, Taphonomy, and Applied Research

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