H.A. Lawrence's research while affiliated with Manaaki Whenua - Landcare Research and other places
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Publications (16)
Although described as a distinct species in 1869, for more than a century now New Zealand's grey-faced petrel (Pterodroma macroptera gouldi Hutton, 1869) has been regarded as a subspecies of the great-winged petrel (P. macroptera A. Smith, 1840). However, several authors have recently questioned whether the taxon once again deserves full species st...
Seabirds are highly vagile yet many have restricted gene flow owing to physical barriers (e. g. land or ice) or non-physical barriers (e. g. philopatry), which often results in population divergence. Identification of distinct units is important for defining conservation status, guiding restoration of populations and coastal ecosystems, and managin...
A unique Pterodroma petrel shot at sea near the Antipodes Islands in 1926 has features intermediate between white-headed petrel (Pterodroma lessonii) and soft-plumaged petrel (Pt. mollis). Its mitochondrial DNA indicates that its mother was a Pt. mollis and we conclude that it is a hybrid. We theorise that Pt. mollis had begun colonising Antipodes...
Hochstetters frog (Leiopelma hochstetteri) is one of only four endemic frog species within New Zealand. Here we describe the first 11 polymorphic microsatellite loci
for this species developed using high-throughput genomic sequencing technology. Genetic diversity was assessed in 34 individuals
sampled from a single location. We also tested these in...
A lone petrel was shot from the decks of an Italian warship (the 'Magenta') while it was sailing the South Pacific Ocean in 1867, far from land. The species, unknown to science, was named the 'Magenta petrel' (Procellariiformes, Procellariidae, Pterodroma magentae). No other specimens of this bird were collected and the species it represented remai...
The Chatham Island Taiko (Tchaik, Pterodroma magentae) is one of the world's rarest seabirds. In the past there were millions of breeding pairs of Taiko and it was the most abundant burrowing petrel on Chatham Island. The present population consists of just 120-150 birds, including only 8-15 breeding pairs. Surprisingly high genetic variation was r...
Interpreting the levels of genetic diversity in organisms with diverse life and population histories can be difficult. The
processes and mechanisms regulating this diversity are complex and still poorly understood. However, endangered species typically
have low genetic variation as a consequence of the effects of genetic drift in small populations....
Many rare and endangered species are difficult to locate, observe, and study. Consequently, many individuals, breeding pairs, and even populations of such species could remain undetected. Genetic markers can potentially be used to detect the existence of undiscovered individuals and populations, and we propose a method to do so that requires 3 cond...
The Chatham Island taiko Pterodroma magentae (tchaik) is one of the World's most endangered seabirds with a population size of between 120-150 individuals that includes only 8-15 breeding pairs. Molecular techniques were used to identify the sex of taiko, which is difficult to assign morphologically. Blood samples were obtained from almost the enti...
Citations
... A comprehensive assessment including morphology, phenotype, vocalisations, phenology, other behaviour, and genetics to compare the taxon with the White-necked Petrel, and elucidate its taxonomic affinities with other Pterodroma petrels, is desirable (e.g. Wood et al. 2017). ...
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... Мягкопëрый буревестник обособлен от других систематически близких симпатричных видов буревестников, хотя был установлен уникальный случай гибридизации его с белоголовым буревестником Pterodroma lessonii (Garnot, 1826) (Tennyson et al. 2013). Это полиморфный вид. ...
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... For example, stable isotope analysis provided support for the movement of individuals between populations of the North Atlantic Leach's storm petrel (Hydrobates leucorhous), with migration into one population likely to be mitigating substantial predation losses that may otherwise lead to its collapse (Bicknell et al. 2014). In a study of the New Zealand grey-faced petrel (Pterodroma gouldi), genetic data found a lack of population structure between colonies, which together with mark-recapture data suggests a high level of connectivity between them despite the natal philopatry exhibited by the species (Lawrence et al. 2014). This data highlights the potential of establishing new grey-faced petrel breeding colonies that can bolster population numbers and support customary harvest aspirations of Indigenous Māori (Lawrence et al. 2014). ...
... This poses a particular risk to L. hamiltoni, since relict island populations have often been shown to have genetic variation reduced further than populations of the same species on the mainland (Frankham 1997;Boessenkool et al. 2007;Cardoso et al. 2009). Populations of Leiopelma have low genetic diversity compared with other anurans (Green 1994;Clay et al. 2010;Easton 2018). ...
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... Instead, retained ancestral variation due to a long generation time (11.7 years, BirdLife International 2023) may have prevented the loss of genetic diversity in red-tailed tropicbird colonies that have suffered past population declines resulting from human disturbance on nesting islands. Previous studies reported high genetic diversity in seabird populations exhibiting population declines caused by human disturbance (e.g., Genovart et al. 2007;Lawrence et al. 2008;Welch et al. 2012, Antaky et al. 2020. For example, the endangered Hawaiian band-rumped storm petrel, Hydrobates castro is thought to have suffered severe population declines; however, SNPs analyses showed low inbreeding estimates and high genetic diversity probably resulting from promiscuous mating behavior or sex-biased dispersal (Antaky et al. 2020). ...
... We obtained feather samples from ten greatwinged petrel museum specimens that represented individuals from several islands within their breeding range (Table S1; Fig. 1). DNA extractions and PCR set-ups on these were carried out in a dedicated ancient DNA laboratory (following the protocols of Lawrence et al., 2009). We also extracted DNA from tissue samples of three white-headed petrel museum Figure 1. ...
... Specimens are very rare in museum collections: in addition to the holotype, Te Papa Tongarewa (Museum of New Zealand) holds an adult male and a juvenile (https://collections.tepapa.govt.nz/topic/2802) and the Canterbury Museum, New Zealand, a fourth specimen (Pacific Ocean, ante 1910), misidentified until 2008 as Tahiti Petrel Pseudobulweria rostrata (Lawrence et al. 2008). Remarks.-Orazio ...
... Another key concern was the number of isolated single males occupying burrows and failing to find partners (Lawrence et al., 2008). With no practical options to protect and enhance breeding sites with a predator-proof fence in the remote forested interior, a decision was made in conjunction with supportive private landowners to fence off a forested hilltop near the coast. ...
... DNA extraction and PCR set-up were carried out in the Allan Wilson Centre for Molecular Ecology and Evolution Ancient DNA A hybrid Pterodroma off the Antipodes Islands Laboratory at Massey University Albany, Auckland. DNA was extracted and amplified twice on separate occasions and sequenced in both directions using primers LCytB679 and HCytB780 (Lawrence et al. 2008a; methods as in Lawrence et al. 2009). We aligned the 102 base pair (bp) sequence (GenBank accession no. ...
... Table 11.1 lists case studies where molecular data have been used to infer population processes that can help inform conservation decisions. Geneticmarker data may also be used to estimate the connectedness and conservation status of natural populations in the face of global change , Lawrence et al. 2008. Although neutral genetic divergence (based on molecular techniques) does tend to positively correlate with variation in actual phenotypic traits, it is also important to note that for many species, the relationship is weak or absent and thus may grant little predictive power (McKay and Latta 2002, Leinonen et al. 2008). ...
