Life history told by a whale-louse: a possible interaction of a southern right whale Eubalaena australis calf with humpback whales Megaptera novaeangliae

Iwasa-Arai, Tammy; Siciliano, Salvatore; Serejo, Cristiana S.; Rodríguez-Rey, Ghennie T.

doi:10.1186/s10152-017-0486-y

Cited by 8 publications

(4 citation statements)

References 20 publications

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“…It could also reflect a less rapid evolution of in I. deltobranchium or effective dispersion between hosts in the North Sea ( Trobajo et al, 2010 ; Kaliszewska et al, 2005 ), however, I. deltobranchium sequences from other parts of the North Atlantic are required to support this. The intra-specific differences observed in sequences of I. delphinii specimens from the pilot whale could be a support for a faster evolution rate in the parasite than the host ( Kaliszewska et al, 2005 ; Iwasa-Arai et al, 2017b ). Phylogenetic comparison with other cyamid species COI sequences available in GenBank revealed two distinct clades, the Isocyamus and Cyamus clades.…”

Section: Discussionmentioning

confidence: 95%

Whale lice (Isocyamus deltobranchium & Isocyamus delphinii; Cyamidae) prevalence in odontocetes off the German and Dutch coasts – morphological and molecular characterization and health implications

Lehnert

IJsseldijk

et al. 2021

International Journal for Parasitology: Parasites and Wildlife

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Whale lice (Cyamidae; Amphipoda) are ectoparasitic crustaceans adapted to the marine environment with cetaceans as their host. There are few reports of cyamids occurring in odontocetes from the North Sea, and long-term studies are lacking. Marine mammal health was monitored along the German and Dutch coasts in the past decades, with extensive post mortem investigations conducted. The aim of this study was to analyse archived ectoparasite samples from stranded cetaceans from the North Sea (2010–2019), to determine species, prevalence and impact of ectoparasite infection. Ectoparasites were found on two cetacean species – harbour porpoises ( Phocoena phocoena ), as the most abundant cetacean species in the North Sea, and on a pilot whale ( Globicephala melas ), as a rare species here. Prevalence of ectoparasitic crustaceans in cetaceans was low: 7.6% in porpoises stranded in the Netherlands (n = 608) and 1.6% in porpoises stranded in Germany (n = 122). All whale lice infections were found on hosts with skin lesions characterised by ulcerations. Morphological investigations revealed characteristic differences between the cyamid species Isocyamus (I.) delphinii and I. deltobranchium identified. Isocyamus deltobranchium was determined in all infected harbour porpoises. I. delphinii was identified on only the pilot whale. Molecular analyses showed 88% similarity of mDNA sequences of I. delphinii with I. deltobranchium supporting them as separate species. Phylogenetic analyses of additional gene loci are required to fully assess the diversity and exchange of whale lice species between geographical regions as well as host specificity. Differing whale lice prevalences in porpoises stranded in the Netherlands and Germany could indicate a difference in severity of skin lesions between these areas. It should be further investigated if more inter- or intraspecific contact, e.g., due to a higher density of porpoises or contact with other cetaceans, or a poorer health status of porpoises in the southern North Sea could explain these differences.

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Section: Discussionmentioning

confidence: 95%

Whale lice (Isocyamus deltobranchium & Isocyamus delphinii; Cyamidae) prevalence in odontocetes off the German and Dutch coasts – morphological and molecular characterization and health implications

Lehnert

IJsseldijk

et al. 2021

International Journal for Parasitology: Parasites and Wildlife

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“…COI (Iwasa-Arai et al, 2017a; GenBank FJ751158; FJ751159; MT551876; OK562816-OK562832), COII, COIII, ATP6, ATP8, ND3 (Kaliszewska et al, 2005) and the complete mitochondrial genome (GenBank MT458501) 2000; Alonso de Pina and Giuffra, 2003;Carvalho et al, 2010;Iwasa-Arai et al, 2016;Iwasa-Arai et al, 2017b;Groch et al, 2018;Iwasa-Arai et al, 2021;Qiao et al, 2020 Cyamus catodontis (Margolis, 1954)…”

Section: Molecular Sequencesmentioning

confidence: 99%

“…Remarks Lehnert et al (2021) pose that some records around the 1970-90s misidentified this species and refer to Isocyamus deltobranchium Sedlak-Weinstein, 1992, which has triangular accessory gills (vs. cylindrical in I. delphinii). Iwasa-Arai et al, 2017a;Kobayashi et al, 2021 Isocyamus kogiae (Sedlak-Weinstein, 1992)…”

Section: Use As Indicatormentioning

confidence: 99%

Epibiotic Fauna on Cetaceans Worldwide: A Systematic Review of Records and Indicator Potential

2022

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Each individual cetacean is an ecosystem itself, potentially harboring a great variety of animals that travel with it. Despite being often despised or overlooked, many of these epizoites have been proven to be suitable bio-indicators of their cetacean hosts, informing on health status, social interactions, migration patterns, population structure or phylogeography. Moreover, epizoites are advantageous over internal parasites in that many of them can be detected by direct observation (e.g., boat surveys), thus no capture or dissection of cetaceans are necessary. Previous reviews of epizoites of cetaceans have focused on specific geographical areas, cetacean species or epibiotic taxa, but fall short to include the increasing number of records and scientific findings about these animals. Here we present an updated review of all records of associations between cetaceans and their epibiotic fauna (i.e., commensals, ecto- or mesoparasites, and mutualists). We gathered nearly 500 publications and found a total of 58 facultative or obligate epibiotic taxa from 11 orders of arthropods, vertebrates, cnidarians, and a nematode that are associated to the external surface of 66 cetacean species around the globe. We also provide information on the use as an indicator species in the literature, if any, and about other relevant traits, such as geographic range, host specificity, genetic data, and life-cycle. We encourage researchers, not only to provide quantitative data (i.e., prevalence, abundance) on the epizoites they find on cetaceans, but also to inform on their absence. The inferences drawn from epizoites can greatly benefit conservation plans of both cetaceans and their epizoites.

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“…Yet, they often maintain a strong fidelity to key components of their habitat, including reproductive sites, particularly for animals that reproduce on land, such as a high number of pinniped species, to which they return at specific times of the year. This requires accurate time keeping and navigation skills using a range of clues, such as Earth magnetic fields (Lohmann et al, 2004;Lohmann, 2010;Cresci et al, 2017;Naisbett-Jones et al, 2017), to migrate along persistent oceanic corridors or highways (Rose, 1993;Shaffer et al, 2006;Horton et al, 2017;Iwasa-Arai et al, 2017). Migration highways are more often observed in strongly social animals, such as marine mammals, in contrast to solitary animals, such as turtles and sharks (Queiroz et al, 2016), (Broderick et al, 2007).…”

Section: Introductionmentioning

confidence: 99%

Coherent movement patterns of female northern elephant seals across the NE Pacific Ocean

Pei,

Zhang,

Eguíluz

et al. 2023

Front. Mar. Sci.

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Northern elephant seals engage in large-scale foraging migrations traveling up to 15,000 Km over 8 months in the northeast Pacific. While traditionally considered solitary migrants, we demonstrate here that female seals migrate in a surprisingly coherent manner, for individual northern elephant seals traveling in over such a large region of the ocean. Animal movement remained coherent, in terms of the direction of individual swimming relative to group movement, throughout much of their migrations. Movement coherence remained well above the value expected if the movement was independent until the migrating seals were further than 1,000 Km from the colony, beyond which movement coherence declined. Migrating seals presented regional aggregations consisting of female seals traveling within the center of the aggregation, closely following the main migration pathway, with individuals isolated on the extremes of the aggregation. These formations were preserved in the out-and-return migration trips. Animals at the edges of the group show an absence of correlation in their movement with the rest of animals. The observed movements exhibited a lag in the group movement patterns that was greater for female animals > 1,000 Km apart. A model that reproduced movement based on the average individual movement properties failed to reproduce the observed movement patterns. In turn, when a parameter was introduced that reflected group behavior, the resulting modelled movement conformed to the observed patterns, thereby demonstrating the presence of coherent, or synchronized, movement. Whereas the duration of female migration is ultimately constrained by reproductive biology, the coherent movement may involve both endogenous and exogenous cues determining the timing of the initiation of return across 25 million Km2 in the northeast Pacific.

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Life history told by a whale-louse: a possible interaction of a southern right whale Eubalaena australis calf with humpback whales Megaptera novaeangliae

Cited by 8 publications

References 20 publications

Whale lice (Isocyamus deltobranchium & Isocyamus delphinii; Cyamidae) prevalence in odontocetes off the German and Dutch coasts – morphological and molecular characterization and health implications

Whale lice (Isocyamus deltobranchium & Isocyamus delphinii; Cyamidae) prevalence in odontocetes off the German and Dutch coasts – morphological and molecular characterization and health implications

Epibiotic Fauna on Cetaceans Worldwide: A Systematic Review of Records and Indicator Potential

Coherent movement patterns of female northern elephant seals across the NE Pacific Ocean

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