Travel for sex: Long-range breeding dispersal and winter haulout fidelity in southern sea lion males

Giardino, Gisela V.; Mandiola, M. Agustina; Bastida, Julián; Denuncio, Pablo; Bastida, Ricardo; Rodríguez, Diego H.

doi:10.1016/j.mambio.2014.12.003

Cited by 28 publications

(24 citation statements)

References 43 publications

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“…A potential cost of foraging site fidelity is that individuals lack the flexibility to respond to environmental change (Bolnick et al, 2003;Wakefield et al, 2015). However, we did not detect foraging site fidelity in all males tracked, and the emerging picture from other male SASL satellite telemetry and marking studies is that male SASL nonbreeding movements are diverse and complex (ranging from foraging site fidelity to extended seasonal movements) (Giardino et al, 2016;Hückstädt et al, 2014). This implies that male SASL have a high degree of behavioral flexibility.…”

Section: Discussionmentioning

confidence: 55%

“…This is despite not being constrained by the need to care for dependent young ashore. Although SASL males at other breeding sites (Giardino et al., ), and males of other sea lion species (Raum‐Suryan et al., ; Robertson et al., ), undertake extended movements during the nonbreeding period, only one male SASL in our study undertook an extended foraging trip away from the Falkland Islands. All other foraging trips where short in distance and duration (127 ± 66 km and 4.1 ± 2.0 days, respectively) and cannot be characterized as extended seasonal movements.…”

Section: Discussionmentioning

confidence: 83%

“…This is despite not being constrained by the need to care for dependent young ashore. Although SASL males at other breeding sites (Giardino et al, 2016), and males of other sea lion species (Raum-Suryan et al, 2004;Robertson et al, 2006) Hamilton, 1939). Males and young animals are often regarded as the main drivers of breeding range expansion and gene flow (Greenwood, 1980;Raum-Suryan et al, 2004;Robertson et al, 2006).…”

Section: Discussionmentioning

confidence: 99%

“…Of the few studies that have assessed the nonbreeding movements of male SASL, juvenile male SASL captured in Chile either concentrate their foraging effort in areas associated with salmonoid aquaculture (southern Chile), or in the absence of aquaculture, travel extensively along the Chilean coast (central Chile) (Hückstädt et al, 2014;Sepulveda et al, 2015). Similarly, a bleach marking study revealed that male SASL in Argentina abandon breeding areas during the nonbreeding period and travel extended distances (>500 km) to winter in Patagonia or Uruguay (Giardino et al, 2016). These studies suggest that male SASL show little fidelity to breeding locations and range widely during the nonbreeding period.…”

Section: Introductionmentioning

confidence: 99%

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Habitat use and spatial fidelity of male South American sea lions during the nonbreeding period

Baylis

Orben

Costa

et al. 2017

Ecology and Evolution

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Conditions experienced during the nonbreeding period have profound long‐term effects on individual fitness and survival. Therefore, knowledge of habitat use during the nonbreeding period can provide insights into processes that regulate populations. At the Falkland Islands, the habitat use of South American sea lions (Otaria flavescens) during the nonbreeding period is of particular interest because the population is yet to recover from a catastrophic decline between the mid‐1930s and 1965, and nonbreeding movements are poorly understood. Here, we assessed the habitat use of adult male (n = 13) and juvenile male (n = 6) South American sea lions at the Falkland Islands using satellite tags and stable isotope analysis of vibrissae. Male South American sea lions behaved like central place foragers. Foraging trips were restricted to the Patagonian Shelf and were typically short in distance and duration (127 ± 66 km and 4.1 ± 2.0 days, respectively). Individual male foraging trips were also typically characterized by a high degree of foraging site fidelity. However, the isotopic niche of adult males was smaller than juvenile males, which suggested that adult males were more consistent in their use of foraging habitats and prey over time. Our findings differ from male South American sea lions in Chile and Argentina, which undertake extended movements during the nonbreeding period. Hence, throughout their breeding range, male South American sea lions have diverse movement patterns during the nonbreeding period that intuitively reflects differences in the predictability or accessibility of preferred prey. Our findings challenge the long‐standing notion that South American sea lions undertake a winter migration away from the Falkland Islands. Therefore, impediments to South American sea lion population recovery likely originate locally and conservation measures at a national level are likely to be effective in addressing the decline and the failure of the population to recover.

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Section: Discussionmentioning

confidence: 55%

Section: Discussionmentioning

confidence: 83%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Habitat use and spatial fidelity of male South American sea lions during the nonbreeding period

Baylis

Orben

Costa

et al. 2017

Ecology and Evolution

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“…exist as well, both in historic (Zenteno et al 2015) and modern times (Giardino et al 2016). Those changes in the distribution of that species could be considered either natural or human induced.…”

Section: Temporal and Spatial Native Rangementioning

confidence: 99%

Rethinking the native range concept

Pereyra

2019

Conservation Biology

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A species is not native outside its native range, but native range is not precisely defined. The invasion literature contains wide discussion of the core concepts such as naturalization, invasiveness, and ecological impact, but the concept of native range has received so little attention that a formal definition does not exist. I considered, among other impediments to a formal definition of native range, the sometimes arbitrariness of the spatial and temporal limits assigned to native range. Broad questions that remain include whether invasion theory can be used to define the native range for species without non‐native ranges.

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Operational interactions between South American sea lions and gillnet fishing in southern Brazil

Machado

Ott

Moreno

et al. 2015

Aquatic Conservation

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1. This study describes operational interactions between coastal gillnet fishing and South American sea lions (Otaria flavescens) off the southern Brazilian coast.2. In total, 263 onboard surveys were carried out during three periods between 1992 and 2012 in fishing boats from two harbours on the northern coast of Rio Grande do Sul State: Passo de Torres (29°19'S; 49°43'W) and Imbé (29°58'S; 50°07'W).3. Interactions of South American sea lions were observed in 116 (24.0%) out of 484 fishing operations. These interactions were more frequent in fishing boats from Passo de Torres (frequency of occurrence FO = 42.8%) than those from Imbé (FO = 14.8%; P < 0.001) and during autumn and winter months.4. Interactions between South American sea lions and fishing activities with fixed bottom gillnets in Imbé were most frequent during period III of the study (2011/2012) (FO = 52.0%; P = 0.032).5. These results demonstrated that interactions are not as high as reported/complained about by the local fishermen who tend to exaggerate the impact of these interactions.6. It is suggested that reduced fish stock and increased fishing effort during recent decades is raising the frequency of encounters with South American sea lions during fishing activities off the southern Brazilian coast. Therefore, the implementation of fishery management measures that reduce fishing effort and that integrate environmental education programmes are essential to reduce conflicts between fishing activities and the sea lions in the region.

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Travel for sex: Long-range breeding dispersal and winter haulout fidelity in southern sea lion males

Cited by 28 publications

References 43 publications

Habitat use and spatial fidelity of male South American sea lions during the nonbreeding period

Habitat use and spatial fidelity of male South American sea lions during the nonbreeding period

Rethinking the native range concept

Operational interactions between South American sea lions and gillnet fishing in southern Brazil

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