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61 results for “fin whale”
Data from: Mitogenomic phylogenetics of fin whales (Balaenoptera physalus spp.): genetic evidence for revision of subspecies
There are three described subspecies of fin whales (Balaenoptera physalus): B. p. physalus Linnaeus, 1758 in the Northern Hemisphere, B. p. quoyi Fischer, 1829 in the Southern Hemisphere, and a recently described pygmy form, B. p. patachonica Burmeister, 1865. The discrete distribution in the North Pacific and North Atlantic raises the question of whether a single Northern Hemisphere subspecies is valid. We assess phylogenetic patterns using ~16 K base pairs of the complete mitogenome for 154 fin whales from the North Pacific, North Atlantic - including the Mediterranean Sea - and Southern Hemisphere. A Bayesian tree of the resulting 136 haplotypes revealed several well-supported clades representing each ocean basin, with no haplotypes shared among ocean basins. The North Atlantic haplotypes (n = 12) form a sister clade to those from the Southern Hemisphere (n = 42). The estimated time to most recent common ancestor (TMRCA) for this Atlantic/Southern Hemisphere clade and 81 of the 97 samples from the North Pacific was approximately 2 Ma. 14 of the remaining North Pacific samples formed a well-supported clade within the Southern Hemisphere. The TMRCA for this node suggests that at least one female from the Southern Hemisphere immigrated to the North Pacific approximately 0.37 Ma. These results provide strong evidence that North Pacific and North Atlantic fin whales should not be considered the same subspecies, and suggest the need for revision of the global taxonomy of the species.
Fig. 3 in Age- and sex-specific survivorship of the Southern Hemisphere long-finned pilot whale (Globicephala melas edwardii)
Fig. 3.—Age-specific mortality rates (qx) for male and female longfinned pilot whales (Globicephala melas edwardii) mass-stranded on the New Zealand coast between 2006 and 2017. Points are based on traditional life table calculations (qx) and smoothed curves were fitted using the Siler model (Siler qx). Age-class = age x to x + 1.
Fig. 1 in Age- and sex-specific survivorship of the Southern Hemisphere long-finned pilot whale (Globicephala melas edwardii)
Fig. 1.—Age distribution of female (n = 227), male (n = 154), and unknown sex (n = 3) long-finned pilot whales (Globicephala melas edwardii) mass-stranded on the New Zealand coast between 2006 and 2017.
Fig. 2 in Age- and sex-specific survivorship of the Southern Hemisphere long-finned pilot whale (Globicephala melas edwardii)
Fig. 2.—Age-specific survivorship (lx) for male and female longfinned pilot whales (Globicephala melas edwardii) mass-stranded on the New Zealand coast between 2006 and 2017. Points are based on traditional life table calculations (lx) and smoothed curves were fitted using the Siler model (Siler lx). Age-class = age x to x + 1.
Data for: Lack of intergenerational reproductive conflict, rather than lack of inclusive fitness benefits, likely explains absence of post-reproductive lifespan in long-finned pilot whales
<p>Life history theory suggests that individuals should reproduce until death, yet females of a small number of mammals live for a significant period after ceasing reproduction, a phenomenon known as post-reproductive lifespan. It is thought that the evolution of this trait is facilitated by increasing local relatedness throughout a female's lifetime. This allows older females to gain inclusive fitness through helping their offspring (known as a mother effect) and/or grandoffspring (known as a grandmother effect), rather than gaining direct fitness through reproducing. However, older females may only benefit from stopping reproducing when their direct offspring compete with those of their daughters. Here, we investigate whether a lack of post-reproductive lifespan in long-finned pilot whales (<em>Globicephala melas</em>) results from minimal benefits incurred from the presence of older females, or from a lack of costs resulting from mother-daughter co-reproduction. Using microsatellite data, we conducted parentage analysis on individuals from 25 pods and find that younger females were more likely to have offspring if their mother was present in their pod, indicating that mothers may assist inexperienced daughters to reproduce. However, we found no evidence of reproductive conflict between co-reproducing mothers and daughters, indicating that females may be able to reproduce into old age whilst simultaneously aiding their daughters in reproduction. This highlights the importance of reproductive conflict in the evolution of a post-reproductive lifespan and demonstrates that mother and grandmother effects alone do not result in the evolution of a post-reproductive lifespan.</p>
Data from: Mitogenomic phylogenetics of fin whales (Balaenoptera physalus spp.): genetic evidence for revision of subspecies
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Data from: Vocal foragers and silent crowds: context-dependent vocal variation in Northeast Atlantic long-finned pilot whales
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Data from: Familial social structure and socially-driven genetic differentiation in Hawaiian short-finned pilot whales
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Data from: Why don’t long-finned pilot whales have post-reproductive lifespan? insights from genetic data
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Data from: Seasonal and diel cycles of fin whale acoustic occurence near Elephant Island, Antarctica
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Data from: Decline in abundance and apparent survival rates of fin whales (Balaenoptera physalus) in the northern Gulf of St. Lawrence
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Data from: Fin whale (Balaenoptera physalus) mitogenomics: a cautionary tale of defining sub-species from mitochondrial sequence monophyly
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Data for: Lack of intergenerational reproductive conflict, rather than lack of inclusive fitness benefits, likely explains absence of post-reproductive lifespan in long-finned pilot whales
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Data from: Long-term isolation at a low effective population size greatly reduced genetic diversity in Gulf of California fin whales
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Australian long-finned pilot whales (Globicephala melas) emit stereotypical, variable, biphonic, multi-component, and sequenced vocalisations, similar to those recorded in the northern hemisphere
<p>While in the northern hemisphere, many studies have been conducted on the vocal repertoire of long-finned pilot whales (<i>Globicephala melas</i>), no such study has been conducted in the southern hemisphere. Presented here, is the first study on the vocalisations of long-finned pilot whales along the southern coast of mainland Australia. Multiple measures were taken of<b> </b>2 028 vocalisations recorded over five years in several locations. These vocalisations included tonal sounds with and without overtones, sounds of burst-pulse character, graded sounds, biphonations, and calls of multiple components. Vocalisations were further categorised based on spectrographic features into 18 contour classes. Altogether, vocalisations ranged from approximately 200 Hz to 25 kHz in fundamental frequency and from 0.03 s to 2.07 s in duration. These measures compared well with those from northern hemisphere pilot whales. Some call types were almost identical to northern hemisphere vocalisations, even though the geographic ranges of the two populations are far apart. Other call types were unique to Australia. Striking similarities with calls of short-finned pilot whales (<i>Globicephala macrorhynchus</i>) and sometimes sympatric killer whales (<i>Orcinus orca</i>) were also found. Theories for call convergence and divergence are discussed.</p>
Figure S4.17. Dynamic weekly suitability map for fin whales around São Miguel island, Azores.
<p>Dynamic weekly suitability map for fin whales around São Miguel island, Azores.</p>
Figure S.4.3. Dynamic weekly suitability map for short-finned pilot whales around São Miguel island, Azores.
<p>Dynamic weekly suitability map for short-finned pilot whales around São Miguel island, Azores.</p>
Fig. 2. Larval Crassicauda spp. a, b in Morphological and molecular characterization of adults and larvae of Crassicauda spp. (Nematoda: Spirurida) from Mediterranean fin whales Balaenoptera physalus (Linnaeus, 1758)
Fig. 2. Larval Crassicauda spp. a, b) Cephalic and caudal end of larvae from intestinal nodules (a, bar = 40 μm; b, bar = 60 μm). c, d. Cephalic and caudal end of larvae isolated from mesenteric arteries wall (c, bar = 25 μm; d, bar = 65 μm). In a and c the black arrow indicates lips with terminal tooth, while in b and d black arrow indicates the anus. e, f) Cephalic and caudal end of larvae isolated from intestinal lumen, with caudal papillae visible in f (black arrow) (e, bar = 60 μm; f, bar = 70 μm).
Fig. 1. Adult Crassicauda boopis. a in Morphological and molecular characterization of adults and larvae of Crassicauda spp. (Nematoda: Spirurida) from Mediterranean fin whales Balaenoptera physalus (Linnaeus, 1758)
Fig. 1. Adult Crassicauda boopis. a) Female. Cephalic end (bar = 120 μm) with particular of the buccal cavity (arrowhead in the upper inset, lateral view; bar = 60 μm) and of lateral and submedial cephalic papillae situated along the margin of a cuticular plate (arrowheads in lower inset, apical view; bar = 25 μm). b) Female. Paired uteri opening in the vulva (arrowhead) (bar = 600 μm). c) Male. Coiled caudal extremity with caudal papillae (arrowhead) (stereomicroscope) (bar = 1 mm).
Australian long-finned pilot whales (Globicephala melas) emit stereotypical, variable, biphonic, multi-component, and sequenced vocalisations, similar to those recorded in the northern hemisphere
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International Brain Laboratory public data
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OpenNeuro
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