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Ectoparasites of the Critically Endangered Giant Shovelnose Ray Glaucostegus typus in the Eastern Indian Ocean, with a Summary of the Known Metazoan Parasites
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Ectoparasites of the Critically Endangered Giant Shovelnose Ray Glaucostegus typus in the Eastern Indian Ocean, with a Summary of the Known Metazoan Parasites
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Journal Article
Ectoparasites of the Critically Endangered Giant Shovelnose Ray Glaucostegus typus in the Eastern Indian Ocean, with a Summary of the Known Metazoan Parasites
2024
Overview
Purpose
This study examined the metazoan ectoparasites of the Critically Endangered giant shovelnose ray,
Glaucostegus typus
, in the eastern Indian Ocean.
Methods
We screened 186
G
.
typus
for ectoparasites in four coastal regions of Western Australia between 2020 and 2022: the Pilbara Region, Exmouth Gulf, Ningaloo Coast and Shark Bay.
Results
Five parasite taxa were encountered on 186
G
.
typus
:
Caligus furcisetifer
(Copepoda: Caligidae),
Dermopristis cairae
(Monopisthocotyla: Microbothriidae),
Branchellion plicobranchus
and
Stibarobdella macrothela
(Hirudinida: Piscicolidae), and praniza larvae of unidentified gnathiid isopod/s (Isopoda: Gnathiidae). Two of these species,
B. plicobranchus
and
S. macrothela
, are reported for the first time on
G. typus
. Only
C
.
furcisetifer
and
S
.
macrothela
were relatively common, encountered on 31% and 40% of
G
.
typus
, respectively. Gnathiids were observed infrequently, encountered on 13% of
G
.
typus
, and
D
.
cairae
and
B. plicobranchus
were scarce, encountered on 1% and 2% of
G
.
typus
, respectively. Intensity of infection for
C
.
furcisetifer
and gnathiids increased with host length. Likelihood of infection varied seasonally for
C. furcisetifer
, being considerably lower in summer, and regionally for gnathiids, being greatest at Shark Bay. Intensity and likelihood of infection for
S
.
macrothela
increased with host length and varied regionally, being greatest at Shark Bay.
Conclusion
These findings improve our understanding of the downstream impacts for dependent parasites that might arise should populations of
G
.
typus
continue to decline.
Publisher
Springer International Publishing,Springer Nature B.V
Subject
Animal Systematics/Taxonomy/Biogeography
/ Animals
/ Biomedical and Life Sciences
/ Ecology
/ Ectoparasitic Infestations - epidemiology
/ Ectoparasitic Infestations - parasitology
/ Ectoparasitic Infestations - veterinary
/ Endangered & extinct species
/ Fish Diseases - epidemiology
/ Fish Diseases - parasitology
/ Sharks
