Genetic population structure of black‐browed and Campbell albatrosses, and implications for assigning provenance of birds killed in fisheries

Burg, Theresa M.; Catry, Paulo; Ryan, Peter G.; Phillips, Richard A.

doi:10.1002/aqc.2765

Cited by 8 publications

(5 citation statements)

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“…Genetic assignment of bycaught white-chinned petrels has so far been limited to broad geographic region (Techow et al, 2016), but the use of SNPs, as in our study, can provide improved resolution. As in studies of other bycaught seabirds (e.g., Abbott et al, 2006;Burg, Catry, Ryan, & Phillips, 2017;Lombal et al, 2018), this would highlight white-chinned petrel populations that are disproportionately impacted, helping prioritise conservation effort.…”

Section: Genotyping Birds To Determine Provenancementioning

confidence: 87%

Genomics detects population structure within and between ocean basins in a circumpolar seabird: The white‐chinned petrel

et al. 2019

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The Southern Ocean represents a continuous stretch of circumpolar marine habitat, but the potential physical and ecological drivers of evolutionary genetic differentiation across this vast ecosystem remain unclear. We tested for genetic structure across the full circumpolar range of the white‐chinned petrel (Procellaria aequinoctialis) to unravel the potential drivers of population differentiation and test alternative population differentiation hypotheses. Following range‐wide comprehensive sampling, we applied genomic (genotyping‐by‐sequencing or GBS; 60,709 loci) and standard mitochondrial‐marker approaches (cytochrome b and first domain of control region) to quantify genetic diversity within and among island populations, test for isolation by distance, and quantify the number of genetic clusters using neutral and outlier (non‐neutral) loci. Our results supported the multi‐region hypothesis, with a range of analyses showing clear three‐region genetic population structure, split by ocean basin, within two evolutionary units. The most significant differentiation between these regions confirmed previous work distinguishing New Zealand and nominate subspecies. Although there was little evidence of structure within the island groups of the Indian or Atlantic oceans, a small set of highly‐discriminatory outlier loci could assign petrels to ocean basin and potentially to island group, though the latter needs further verification. Genomic data hold the key to revealing substantial regional genetic structure within wide‐ranging circumpolar species previously assumed to be panmictic.

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Section: Genotyping Birds To Determine Provenancementioning

confidence: 87%

Genomics detects population structure within and between ocean basins in a circumpolar seabird: The white‐chinned petrel

et al. 2019

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“…Of these four strategies, remaining exclusively in New Zealand waters was adopted by approximately 10% of birds, and the other three strategies in approximately equal proportions (30% of birds). In contrast, black‐browed albatrosses, which are very closely related to Campbell albatross (Burg & Croxall, 2001; Burg et al, 2017), typically adopt one predominant non‐breeding period strategy. For example, black‐browed albatrosses breeding at the Falkland Islands are predominantly resident, remaining on the Patagonian Shelf year‐round (Grémillet et al, 2000; Ponchon et al, 2019).…”

Section: Discussionmentioning

confidence: 99%

The year‐round distribution and habitat preferences of Campbell albatross (Thalassarche impavida)

Thompson

Goetz

Sagar

et al. 2021

Aquatic Conservation

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The use of miniaturized electronic tracking devices has illuminated our understanding of seabird distributions and habitat use, and how anthropogenic threats interact with seabirds in both space and time. To determine the year‐round distribution of adult Campbell albatross (Thalassarche impavida), a single‐island endemic, breeding only at Campbell Island in New Zealand's subantarctic, a total of 68 year‐long location data sets were acquired from light‐based geolocation data‐logging tags deployed on breeding birds in 2009 and 2010. During the incubation and chick‐guard phases of the breeding season, birds used cool (<10°C) waters over the Campbell Plateau, but also ranged over deeper, shelf‐break and oceanic waters (4,000–5,500 m) beyond the Plateau. Later in the breeding season, during post‐guard chick‐rearing, Campbell albatrosses exploited generally deep waters (4,000–5,000 m) beyond the Campbell Plateau. During the non‐breeding period, adults tended to move northwards into warmer (approximately 15°C) waters and occupied areas beyond western Australia in the west to offshore from Chile in the east. Overall, about 30% of adults spent some of their non‐breeding period in the central and eastern Pacific Ocean, substantially expanding the previously reported range for this species. One bird, that failed in its breeding attempt in October 2009, departed Campbell Island and circumnavigated the southern oceans before being recaptured back at Campbell Island in October 2010. This is the first example of an annually‐breeding albatross species completing a circumnavigation between breeding attempts. Overlap with fishing effort, using data from the Global Fishing Watch database, was assessed on a monthly and seasonal basis. Generally, levels of overlap between Campbell albatross and fishing effort were relatively low during the breeding season but were approximately 60% higher during the non‐breeding period, underlining the need for international initiatives to safeguard this species.

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“…These species-pairs are considerably closer genetically than Black-browed and White-capped Albatrosses according to the best-fit topology based on available DNA barcodes (Chambers et al 2009). Indeed, until recently the two royal albatrosses, and Black-browed and Campbell Albatrosses were considered to be subspecies (Chambers et al 2009, Burg et al 2017.…”

Section: Discussionmentioning

confidence: 99%

“…, Burg et al . ), and at Round Island (near Mauritius), where three species of gadfly petrels Pterodroma spp. established in the last century readily hybridize (Brown et al .…”

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confidence: 99%

“…Hybridization is important from an evolutionary perspective; where pre-and post-mating barriers are weak, hybridization following secondary contact is more likely and can affect genetic structure. This has occurred at Campbell Island (New Zealand), where Black-browed Albatrosses Thalassarche melanophris from multiple lineages have probably colonized only in the last 50 years (Moore et al 2001, Burg et al 2017, and at Round Island (near Mauritius), where three species of gadfly petrels Pterodroma spp. established in the last century readily hybridize (Brown et al 2011).…”

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Breeding‐site vagrancy and hybridization in albatrosses

Phillips

Cooper

Burg

2018

Ibis

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Given the rarity of hybridization in seabirds, which presumably relates to their very high philopatry, the degree of breeding‐site vagrancy should correspond with the incidence of mixed‐species pairing, although not necessarily with the production of hybrids if there are behavioural or genetic barriers to successful reproduction. Using molecular methods, we verified that two of the three chicks hatched by a vagrant male White‐capped Albatross Thalassarche steadi paired with a female Black‐browed Albatross Thalassarche melanophris at South Georgia were genuine hybrids (these chicks died before fledging, but a third chick – the result of an extra‐pair copulation – fledged successfully). In a wider review, we could find only five known or suspected mixed‐species pairs, and three different hybrids in albatrosses, mostly between closely related species. This appears to reflect behavioural barriers to hybridization in sympatric species and the low incidence of breeding‐site vagrancy (which mainly involves single individuals that invariably associate with the most phenotypically similar local taxon). Breeding‐site vagrancy is most frequent in the ‘shy‐albatross’ complex, which could explain why genetic divergence occurred more recently in this group than in other Thalassarche, and hence exploratory behaviour appears to be more important than numerical abundance or breeding distribution in driving colonization as well as hybridization processes in albatrosses.

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Genetic population structure of black‐browed and Campbell albatrosses, and implications for assigning provenance of birds killed in fisheries

Cited by 8 publications

References 40 publications

Genomics detects population structure within and between ocean basins in a circumpolar seabird: The white‐chinned petrel

Genomics detects population structure within and between ocean basins in a circumpolar seabird: The white‐chinned petrel

The year‐round distribution and habitat preferences of Campbell albatross (Thalassarche impavida)

Breeding‐site vagrancy and hybridization in albatrosses

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