Individual variation in movements of satellite-tracked humpback whales Megaptera novaeangliae in the eastern Aleutian Islands and Bering Sea

Kennedy, Amy S.; Zerbini, Alexandre N.; Rone, Brenda K.; Clapham, Phillip J.

doi:10.3354/esr00570

Cited by 32 publications

(28 citation statements)

References 46 publications

(26 reference statements)

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“…Many crustaceans (Hines 1982, Stone andO'Clair 2001), echinoderms (Mattison et al 1976, Cieciel et al 2009), rockfishes and lingcod (Jorgensen et al 2006, Mitamura et al 2009, Tolimieri et al 2009, Beaudreau and Essington 2011, Green and Starr 2011, Freiwald 2012, harbor seals (Peterson et al 2012, Ward et al 2012, some seabirds (Peery et al 2009, Barbaree et al 2015, Lorenz et al 2017, and some flatfishes (Moser et al 2013), exhibit restricted patterns of movement and are likely to exploit one to several major subpopulations, but generally not the entire spatial distribution of the metapopulation (stock). In contrast, humpback whales (Dalla Rosa et al 2008, Kennedy et al 2014), orcas (Hauser et al 2007, Fearnbach et al 2014, some seabirds (Pearce et al 2005), sea lions (Merrick and Loughlin 1997, Fearnbach et al 2014, Kuhn and Costa 2014, fur seals , halibut (Loher 2008, Seitz et al 2011, Nielsen et al 2014, and gadiforms (Wespestad et al 1983, Hanselman et al 2014, Rand et al 2014 can, given ranges reported, access the geographic area covered by the stock (Table 4, see DataS1: Home_Range_Literature). Thus, herring provide food resources to groups with varying movement constraints.…”

Section: Insights Into the Benefits Of Population Portfolios To Managmentioning

confidence: 99%

Spatial variation in exploited metapopulations obscures risk of collapse

Okamoto

Hessing‐Lewis

Samhouri

et al. 2020

Ecological Applications

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Unanticipated declines among exploited species have commonly occurred despite harvests that appeared sustainable prior to collapse. This is particularly true in the oceans where spatial scales of management are often mismatched with spatially complex metapopulations. We explore causes, consequences, and potential solutions for spatial mismatches in harvested metapopulations in three ways. First, we generate novel theory illustrating when and how harvesting metapopulations increases spatial variability and in turn masks local‐scale volatility. Second, we illustrate why spatial variability in harvested metapopulations leads to negative consequences using an empirical example of a Pacific herring metapopulation. Finally, we construct a numerical management strategy evaluation model to identify and highlight potential solutions for mismatches in spatial scale and spatial variability. Our results highlight that spatial complexity can promote stability at large scales, however, ignoring spatial complexity produces cryptic and negative consequences for people and animals that interact with resources at small scales. Harvesting metapopulations magnifies spatial variability, which creates discrepancies between regional and local trends while increasing risk of local population collapses. Such effects asymmetrically impact locally constrained fishers and predators, which are more exposed to risks of localized collapses. Importantly, we show that dynamically optimizing harvest can minimize local risk without sacrificing yield. Thus, multiple nested scales of management may be necessary to avoid cryptic collapses in metapopulations and the ensuing ecological, social, and economic consequences.

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Section: Insights Into the Benefits Of Population Portfolios To Managmentioning

confidence: 99%

Spatial variation in exploited metapopulations obscures risk of collapse

Okamoto

Hessing‐Lewis

Samhouri

et al. 2020

Ecological Applications

View full text Add to dashboard Cite

show abstract

“…Pendoley et al 2014 and additionally; tuna: Block et al 2005; sharks: Domeier and Nasby-Lucas 2008; albatrosses: Weimerskirch et al 2006; seals: Field et al 2005; whales: Zerbini et al 2006). Understanding and quantifying the intra-species connectivity between distant habitats is important for conservation and management (Webster et al 2002; Gerber and Heppell 2004; Kennedy et al 2014) and may necessitate international cooperation and collaboration for effective species protection (Jodice and Suryan 2010). Tagging and satellite tracking technologies have revealed a wealth of information on marine vertebrate life histories and migratory behaviour (Cooke 2008; Block et al 2011) and genetic studies have revealed cryptic population structures (e.g.…”

Section: Introductionmentioning

confidence: 99%

Linking loggerhead locations: using multiple methods to determine the origin of sea turtles in feeding grounds

et al. 2017

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Many marine megavertebrate taxa, including sea turtles, disperse widely from their hatching or birthing locations but display natal homing as adults. We used flipper tagging, satellite tracking and genetics to identify the origin of loggerhead turtles living in Amvrakikos Gulf, Greece. This location has been identified as hosting regionally important numbers of large-juvenile to adult sized turtles that display long-term residency and/or association to the area, and also presents a male biased sex ratio for adults. A total of 20 individuals were linked to nesting areas in Greece through flipper tagging and satellite telemetry, with the majority (16) associated with Zakynthos Island. One additional female was tracked from Amvrakikos Gulf to Turkey where she likely nested. Mitochondrial DNA mixed stock analyses of turtles captured in Amvrakikos Gulf (n = 95) indicated 82% of individuals originated from Greek nesting stocks, mainly from Zakynthos Island (63%), with lesser contributions from central Turkey, Cyprus and Libya. These results suggest that the male-biased sex ratio found in Amvrakikos Gulf may be driven by the fact that males breed twice as frequently on Zakynthos, resulting in their using foraging grounds of greater proximity to the breeding site. Conservation measures in localised foraging habitats for the protection of marine vertebrates, such as sea turtles, may have positive impacts on several disparate breeding stocks and the use of multiple methods to determine source populations can indicate the relative effectiveness of these measures.Electronic supplementary materialThe online version of this article (doi:10.1007/s00227-016-3055-z) contains supplementary material, which is available to authorized users.

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“…Watkins & Schevill 1979, Mayo & Marx 1990) and has been broadly utilised in similar studies (e.g. Bailey et al 2009, Silva et al 2013, Kennedy et al 2014.…”

Section: Switching State-space Modelmentioning

confidence: 99%

Sei whale movements and behaviour in the North Atlantic inferred from satellite telemetry

Prieto¹,

Silva²,

Waring³

et al. 2014

Endang. Species. Res.

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The stock structure of the sei whale Balaenoptera borealis in the North Atlantic is unknown, despite years of commercial hunting. New and up-to-date data on distribution and movements are essential for the creation of plausible hypotheses about the stock structure of this species. Between 2008 and 2009 satellite tracks of 8 sei whales were obtained, 7 during spring and 1 in late September. Using a hierarchical switching state-space model we investigated the movements, behaviour and the role of distinct areas in their life history. Two distinct phases corresponding to migratory and foraging movements were identified. A migratory corridor between the Azores and the Labrador Sea is clearly identifiable from the data. Behaviour consistent with foraging was observed frequently in the Labrador Sea, showing that it constitutes an important feeding ground. A link between the Labrador Sea and other feeding grounds to the east is deemed likely. The data also support a discrete feeding ground in the Gulf of Maine and off Nova Scotia. A possible link between the feeding grounds in the Labrador Sea and wintering grounds off northwestern Africa is proposed.

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Individual variation in movements of satellite-tracked humpback whales Megaptera novaeangliae in the eastern Aleutian Islands and Bering Sea

Cited by 32 publications

References 46 publications

Spatial variation in exploited metapopulations obscures risk of collapse

Spatial variation in exploited metapopulations obscures risk of collapse

Linking loggerhead locations: using multiple methods to determine the origin of sea turtles in feeding grounds

Sei whale movements and behaviour in the North Atlantic inferred from satellite telemetry

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