Joshua Hatch (Integrated Statistics, Inc., Falmouth, Massachusetts, USA) and colleagues have published in the journal Conservation Letters on tracking Great Shearwaters Puffinus gravis in the Gulf of Maine.

The paper’s abstract follows:

“Identifying the overlap of commercial fishing grounds and seabird habitat can suggest areas of high bycatch risk and inform management and mitigation measures.  We used Bayesian state space modeling to describe the movements of 10 satellite-tagged Great Shearwaters and a bivariate kernel density technique to investigate spatial overlap with commercial fishing effort to predict areas of high bycatch in the Gulf of Maine.  We then used contemporaneous fishery observer data to test the validity of our predictions, highlighting an area constituting 1% of the Gulf of Maine as having the highest bycatch risk that accounted for 50% of observed takes.  Fishery observer data also provided insights into characteristics of the seabird-fishery interactions.  Our results indicate that a relatively small number of satellite-tagged seabirds, when combined with fishery-dependent data, can lead to identifying high-bycatch areas, particular fishing practices that might increase risk, and fishing communities that could be targeted for education/mitigation.”

Click here for the unedited version of the manuscript.

Great Shearwater, photograph by John Graham

Reference:

Hatch, J.M., Wiley, D., Murray, K.T.& Welch, L. 2015.  Integrating satellite-tagged seabird and fishery-dependent data: a case study of Great Shearwaters (Puffinus gravis) and the U.S. New England sink gillnet fishery.  Conservation Letters DOI: 10.1111/conl.12178.

John Cooper, ACAP Information Officer, 24 July 2015

Rhiannon Meier (National Oceanography Centre, Southampton, UK) and colleagues have published open-access in the journal Biological Conservation on at-sea movements of the ACAP-listed Balearic Shearwater Puffinus mauretanicus.

The paper’s abstract follows:

“Unprecedented changes to the marine environment and growth of bio-logging science make detailed study of the movement ecology of threatened marine species timely.  Here, we study spatial and temporal patterns of marine space use by a critically endangered seabird: the Balearic shearwater Puffinus mauretanicus.  Using a suite of bio-logging systems, 67 foraging trips were recorded during incubation periods between 2011 and 2014 from one of the species’ largest colonies (Sa Cella, Mallorca).  Most birds followed narrow flight corridors to restricted neritic foraging grounds on the Iberian continental shelf.  Productive foraging areas along the Catalan coast (NE Spain) were consistent across multiple years and between sexes, indicating extensive use of predictable resources.  While our study emphasises the vulnerability of this species to anthropogenic activity in nearshore waters, consisteant commuting corridors and foraging grounds represent tractable habitat for protection and offer hope for developing area-based management approaches.  Preferred foraging areas showed strong overlap with recently declared Special Protection Areas, strengthening the evidence base for targeted management at these sites.”

Balearic Shearwater, photograph by Pep Arcos

Reference:

Meier, R.E., Wynn, R.B., Votier, S.C., McMinn Grivé, M., Rodríguez, A., Maurice, L., van Loon, E.E., Jones, A.R., Suberg, L., Arcos, J.M., Morgan, G., Josey, S.A. & Guilford, T. 2015.  Consistent foraging areas and commuting corridors of the critically endangered Balearic shearwater Puffinus mauretanicus in the northwestern Mediterranean.  Biological Conservation 190: 87–97

John Cooper, ACAP Information Officer, 23 July 2015

Guilherme Frainer (Laboratório de Sistemática e Ecologia de Aves e Mamíferos Marinhos, Departamento de Zoologia, Universidade Federal do Rio Grande do Sul, Porto Alegre, Brazil) and colleagues have published in the journal Marine Biodiversity Records on three aberrantly plumaged White-chinned Petrels Procellaria aequinoctialis.

The paper’s abstract follows:

“We report on three aberrantly plumaged White-chinned Petrels Procellaria aequinoctialis from the Brazilian Economic Exclusive Zone in the south-west Atlantic Ocean – the first reports based upon tangible evidence for the region.  Two of them showed a low degree of colour aberration (some white around the eyes and on the upper-wing coverts), whereas the third exhibited the highest degree of plumage aberration so far reported for the species: a plumage mostly white with brown freckles on the upper- and under-parts, head and nape.  We also commented on problems related to at-sea identification of aberrantly plumaged seabirds.”

Normally-plumaged White-chinned Petrels, photograph by Ben Phalan 

Reference:

Guilherme Frainer, G., Daudt, N.W. & Carlos, C.J. 2015.  Aberrantly plumaged White-chinned Petrels Procellaria aequinoctialis in the Brazilian waters, south-west Atlantic Ocean.  Marine Biodiversity Records 8.  DOI: http://dx.doi.org/10.1017/S1755267215000871.

John Cooper, ACAP Information Officer, 22 July 2015

Hsiang-Wen Huang (National Taiwan Ocean University, Institute of Marine Affairs and Resource Management, Keelung, Taiwan) has written in the journal Fisheries Research on seabirds, including ACAP-listed albatrosses and petrels, killed by Taiwanese longliners in the Pacific.

The paper’s abstract follows:

“To understand the sea turtle and seabird bycatch of Taiwanese tuna longline fleets for conservation purposes, this research analyzed the data collected by onboard observers between 2008 and 2013.  In total, data from 149 trips and 24.3 million hooks were analyzed, including 50 albacore large-scale tuna longline vessel (LTLVs) trips, 72 bigeye LTLVs trips, and 27 small-scale tuna longline vessel (STLVs) trips.  Seabird bycatch was mostly from the albacore LTLVs.  The highest bycatch rate was 0.320 bird per thousand hooks in the southwest Pacific Ocean in the first quarter, followed by the same area in the second quarter (0.046 bird per thousand hooks) by the albacore LTLVs.  For seabird bycatch species, 81.7% were albatrosses, including wandering albatross (Diomedea exulans), Laysan albatross (Phoebastria immutabilis), white-capped albatross (Thalassarche steadi), black-footed albatross (Phoebastria nigripes), and black-browed albatrosses (Diomedea melanophris); other seabird species included white-chinned petrel (Procellaria aequinoctialis), flesh-footed shearwater (Puffinus carneipes), frigate bird and booby.  Regarding sea turtles, the bycatch rate peaked in the second quarter in the western tropical Pacific Ocean by STLVs (0.034 turtle per thousand hooks), followed by albacore LTLVs (0.028 turtle per thousand hooks) during the same time period in the same region. The major bycatch species included olive ridley (Lepidochelys olivacea), followed by green (Chelonia mydas), and leatherback (Dermochelys coriacea).  Observer training for seabird species identification and detailed information collection for mitigation measures should be implemented to ensure better data quality.  This will help implement mitigation measures in areas and fisheries where a large number of birds are taken as bycatch.”

Black-browed Albatross killed on  longline hook, photograph by Graham Robertson

Reference:

Huang, H.W. 2015.  Incidental catch of seabirds and sea turtles by Taiwanese longline fleets in the Pacific Ocean.  Fisheries Research 170: 79-189.

John Cooper, ACAP Information Officer, 21 July 2015