Chilean dolphins on the Argentine Atlantic coast

Morgenthaler, Annick; Fernández, Julia Martínez; Moraga, Rodrigo; Olavarría, Carlos

doi:10.1111/mms.12052

Cited by 5 publications

(6 citation statements)

References 12 publications

(12 reference statements)

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“…These findings echo the -Lobo et al, 1998;Capella, Gibbons, & Vilina, 1999;Goodall et al, 1988;Morgenthaler, Fernández, Moraga, & Olavarría, 2014;Zamorano-Abramson et al, 2010). These findings echo the -Lobo et al, 1998;Capella, Gibbons, & Vilina, 1999;Goodall et al, 1988;Morgenthaler, Fernández, Moraga, & Olavarría, 2014;Zamorano-Abramson et al, 2010).…”

Section: Species-habitat Relationshipssupporting

confidence: 69%

“…Predicted mean occurrence of Chilean dolphins (a) and Peale's dolphins (d) in the the southern study area, together with upper (b, e) and lower (c, f) 95% CI few other habitat studies conducted off the open coast to the north (Pérez-Alvarez, Alvarez, Aguayo-Lobo, & Olavarría, 2007) and in channels south of Chiloé (Viddi, Harcourt, & Hucke-Gaete, 2015), as well as most of the incidental sighting locations reported for this species(Aguayo-Lobo et al, 1998;Capella, Gibbons, & Vilina, 1999;Goodall et al, 1988;Morgenthaler, Fernández, Moraga, & Olavarría, 2014;Zamorano-Abramson et al, 2010). The four dolphins of the genus Cephalorhynchus, to which the Chilean dolphin belongs, are all characterized as coastal shallow-water species(Dawson, 2018), with Commerson's dolphins (C. commersonnii) and Hector's dolphins (C.…”

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confidence: 90%

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Fine‐scale habitat partitioning of Chilean and Peale's dolphins and their overlap with aquaculture

Heinrich

Genov

Riquelme

et al. 2019

Aquatic Conservation

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1. Predictive species distribution models (SDMs) have become powerful tools to determine habitat use patterns of mobile marine predators and their spatial overlap with potentially impacting anthropogenic activities.2. This study used SDMs to investigate fine-scale habitat use patterns of two poorly known and broadly sympatric coastal delphinids, Chilean dolphins (Cephalorhynchus eutropia) and Peale's dolphins (Lagenorhynchus australis), and their spatial interactions with intense aquaculture farming activities in the Chiloé archipelago, southern Chile. A long-term dataset (2002-2012) of boat-based dolphin sightings and concur-rently in situ collected environmental and anthropogenic variables was analysed using binomial Generalized Additive Models to investigate ecological drivers of each species' fine-scale distribution and to predict dolphin occurrence spatially.4. Chilean dolphins preferred shallow (<30 m deep), turbid waters, close to shore (<500 m) and river mouths which often placed them in sheltered bays and channels used intensively by shellfish farms. Peale's dolphins were also found in shallow waters but occurred over a wider range of conditions along more open or exposed coastlines. Both species had to navigate extensive salmon and shellfish farming sites to transit between areas of important habitat.5. Sightings and predicted occurrence maps showed a clear pattern of spatial habitat partitioning between species, which remained stable across the 11 year study period. The identification of important habitat for Chilean dolphins warrants the consideration of spatially explicit conservation measures to limit the potential effects of overlapping salmon and shellfish farming.6. The observed differences in ecological plasticity of the two sympatric species should be considered when evaluating and mitigating the effects of environmental change and ongoing anthropogenic pressures on their nearshore habitat. The estimated species-environment relationships could also be used to predict where dolphin habitat and anthropogenic activities are most likely to overlap in other parts of the species' ranges.

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Section: Species-habitat Relationshipssupporting

confidence: 69%

mentioning

confidence: 90%

Fine‐scale habitat partitioning of Chilean and Peale's dolphins and their overlap with aquaculture

Heinrich

Genov

Riquelme

et al. 2019

Aquatic Conservation

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“…The Chilean dolphin, is the only endemic cetacean species of Chile [ 32 ], although recently a few individuals have been reported in the Argentine coast [ 33 ]. It inhabits two different but contiguous coastal habitats: a northern habitat with exposed coastlines, bays and estuaries from Valparaíso (33°02′S) to Chiloé (42°00′S), and a southern habitat with highly fragmented inshore coastline, channels and fjords between Chiloé and Navarino Island (55°14′S) [ 34 ].…”

Section: Introductionmentioning

confidence: 99%

Microsatellite Markers Reveal Strong Genetic Structure in the Endemic Chilean Dolphin

Pérez‐Álvarez

Olavarría

Moraga³

et al. 2015

PLoS ONE

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Understanding genetic differentiation and speciation processes in marine species with high dispersal capabilities is challenging. The Chilean dolphin, Cephalorhynchus eutropia, is the only endemic cetacean of Chile and is found in two different coastal habitats: a northern habitat with exposed coastlines, bays and estuaries from Valparaíso (33°02′S) to Chiloé (42°00′S), and a southern habitat with highly fragmented inshore coastline, channels and fjords between Chiloé and Navarino Island (55°14′S). With the aim of evaluating the potential existence of conservation units for this species, we analyzed the genetic diversity and population structure of the Chilean dolphin along its entire range. We genotyped 21 dinucleotide microsatellites for 53 skin samples collected between 1998 and 2012 (swab: n = 8, biopsy: n = 38, entanglement n = 7). Bayesian clustering and spatial model analyses identified two genetically distinct populations corresponding to the northern and southern habitats. Genetic diversity levels were similar in the two populations (He: 0.42 v/s 0.45 for southern and northern populations, respectively), while effective size population was higher in the southern area (Ne: 101 v/s 39). Genetic differentiation between these two populations was high and significant (FST = 0.15 and RST = 0.19), indicating little or no current gene flow. Because of the absence of evident geographical barriers between the northern and southern populations, we propose that genetic differentiation may reflect ecological adaptation to the different habitat conditions and resource uses. Therefore, the two genetic populations of this endemic and Near Threatened species should be considered as different conservation units with independent management strategies.

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“…An underlying issue likely common to both subfamilies—a relatively recent and rapid radiation, possibly complicated further by reticulation (hybridization events between recently diverged species, e.g., Morgenthaler et al . ) or even potential hybrid origin of species (Amaral et al . )—adds to the difficultly of teasing apart evolutionary histories.…”

Section: Discussion and Proposed Taxonomic Revisionsmentioning

confidence: 99%

“…), S. obscurus (Van Waerebeek ), C. commersonii (Iñíguez and Tossenberger , but also see Morgenthaler et al . who considered the individuals in question to be C. commersonii x C. eutropia hybrids), L. borealis (Nishiwaki , Leatherwood et al . ), and even a possible hybridization between S. obscurus and L. peronii (Yazdi ).…”

Section: Knowledge Gaps and Future Researchmentioning

confidence: 99%

Taxonomic revision of the dolphin genusLagenorhynchus

Vollmer

Ashe²,

Brownell

et al. 2019

Marine Mammal Science

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Evolutionary relationships among cetaceans within the family Delphinidae have been difficult to resolve due to the high number of species and their relatively rapid radiation. This is the case for the dolphin species currently placed in the genus Lagenorhynchus, and their relations to Cephalorhynchus and Lissodelphis species. Phylogenetic relationships among these species have been investigated using multiple lines of evidence, and that evidence consistently suggests that the six species currently assigned to Lagenorhynchus do not form a monophyletic group. Here, we summarize findings from studies of morphology, genetics, historical biogeography, and acoustics that offer insight into the phylogenetics of these taxa. We present the taxonomic basis for revision of Lagenorhynchus, propose retention of Lagenorhynchus albirostris and reassignment of the remaining five species into other existing generic names, namely Leucopleurus acutus, Sagmatias australis, Sagmatias cruciger, Sagmatias obliquidens, and Sagmatias obscurus. Making these revisions now so that the taxonomy better reflects evolutionary relationships among these species will ensure that future studies include the most appropriate taxa for investigating the 1 957 complex phylogenetic and systematic relationships among cetaceans. However, comprehensive analyses using multiple lines of evidence are still needed to clarify the phylogenetic relationships within and among the Lissodelphininae genera Cephalorhynchus, Lissodelphis, and Sagmatias.

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Chilean dolphins on the Argentine Atlantic coast

Cited by 5 publications

References 12 publications

Fine‐scale habitat partitioning of Chilean and Peale's dolphins and their overlap with aquaculture

Fine‐scale habitat partitioning of Chilean and Peale's dolphins and their overlap with aquaculture

Microsatellite Markers Reveal Strong Genetic Structure in the Endemic Chilean Dolphin

Taxonomic revision of the dolphin genusLagenorhynchus

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