Predicting fisheries bycatch: A case study and field test for pilot whales in a pelagic longline fishery

Abstract

For aims and scope, manuscript preparation and submission instruc tions, subscription and all other information, see the inside back cover and visit: http://wileyonlinelibrary.com/journal/ddi

Do bigger bodies require bigger radiators? Insights into thermal ecology from closely related marine mammal species and implications for ecogeographic rules

“…Therefore, strandings could not be associated with a specific location or environmental variable such as water temperature. However, water temperature is known to be an important factor contributing to the habitat use of these species, and is used by managers in the eastern United States to separate sighting of the two species in regions of overlap (Garrison & Rosel, ; Hayes et al, ; Thorne, Webster, Stepanuk, & Read, ; Thorne et al, ). To further investigate Bergmann's rule and Allen's rule in pilot whales in situ water temperature measurements should be combined with morphological data to understand the relationship between SA:V and environmental temperature.…”

When large marine predators feed on fisheries catches: Global patterns of the depredation conflict and directions for coexistence

“…In some regions, the use of satellite tagging increased knowledge on preferred areas of predators, and therefore, on areas where fishers were the most likely to be subject to depredation (e.g. Cronin, Gerritsen, Reid, & Jessopp, 2016;Oksanen, Niemi, Ahola, & Kunnasranta, 2015;Stepanuk, Read, Baird, Webster, & Thorne, 2018;Straley et al, 2014;Thorne, Baird, Webster, Stepanuk, & Read, 2019). Move-on practices, although commonly used by fishers, were shown effective only when vessels travelled distances sufficiently large to reduce the chances of being actively followed by predators (Forney, Kobayashi, Johnston, Marchetti, & Marsik, 2011;Janc et al, 2018;Tixier et al, 2018;Tixier, Vacquie Garcia, Gasco, Duhamel, & Guinet, 2015).…”

The impact of temperature at depth on estimates of thermal habitat for short‐finned pilot whales

“…At all stations and in all seasons, a wide range of temperatures was observed in available thermal habitat (Table 2). At stations 1 and 2, where pilot whales are thought to occur year‐round (Thorne et al 2017, 2019), temperature at depth differed from surface temperatures by as much as 18°C.…”

“…The distribution of these animals is often associated with oceanographic features, such as thermal fronts, which can create enhanced foraging opportunities (Brown and Winn, 1989; Doniol‐Valcroze et al, 2007; Griffin, 1999; Murase et al, 2002; Whitehead and Carscadden, 1985). Due to the association between temperature and marine mammal habitats, predictive spatial models often incorporate sea surface temperature (SST) as an important model parameter (e.g., Becker et al, 2010; Forney et al, 2012; Hazen et al 2017; Kaschner et al, 2006; Thorne et al 2019). To date, most studies have relied on measurements of surface temperature, and the role of temperature at depth in driving the habitat use, seasonal movements, and spatial distribution of most marine mammal species is very poorly understood.…”

“…Recent telemetry studies have provided extensive observations of the movement and behavior of short-finned pilot whales in both horizontal and vertical dimensions (Quick et al, 2016;Thorne et al, 2017;Wells et al, 2013). Shortfinned pilot whales are known to occur year-round at the shelf break at Cape Hatteras, off the Atlantic coast of the United States, but use waters further north during warmer months (Thorne et al 2017(Thorne et al , 2019. To date, however, studies examining how temperature influences patterns of habitat use in short-finned pilot whales have only relied on measurements of temperature at the surface (Garrison, 2007;Stepanuk, Read, Baird, Webster, & Thorne, 2018;Thorne et al, 2019).…”