Seasonal dynamics of the cestode fauna in spiny dogfish,Squalus acanthias(Squaliformes: Squalidae)

Parasitology ◽  
2014 ◽  
Vol 141 (7) ◽  
pp. 940-947 ◽  
Author(s):  
MARIA PICKERING ◽  
JANINE N. CAIRA
Keyword(s):  
Linear Models ◽  
Squalus Acanthias ◽  
Life History Strategies ◽  
Spiny Dogfish ◽  
Intermediate Hosts ◽  
Cestode Species ◽  
Northwest Atlantic ◽  
Host Diet ◽  
Infection Parameters ◽  
Ocean Environment

SUMMARYThis study furthers understanding of cestode infections in a marine environment through time and space by following seasonal fluctuations in infection parameters of three cestode species (Gilquinia squali, Trilocularia gracilisandPhyllobothrium squali) parasitizing spiny dogfish (Squalus acanthias) in the northwest Atlantic and comparing them to work previously published from the northeast Atlantic onT. gracilis. For each cestode species, host size, season and presence of the other cestode species were analysed using generalized linear models to determine if they were good predictors of prevalence and intensity. Infection parameters differed across season for the three cestode species. However, withinT. gracilisseasonal trends were found to be remarkably similar on both sides of the Atlantic, differing only in a somewhat delayed decline in prevalence in the northwest Atlantic. The differences seen in infection measures across cestode species likely reflect the unique life history strategies of different parasite species. While general trends appear to be maintained across disparate localities, variation seen is likely due to differences in accessibility to intermediate hosts and host diet across sites. The knowledge gained from understanding cestode infections in the vast ocean environment allows us to speculate about the factors driving fluctuations in parasite infections in elasmobranchs.

scholarly journals Observations on spiny dogfish (Squalus acanthias) captured in late spring in a North Carolina estuary

F1000Research ◽  
2014 ◽  
Vol 3 ◽  
pp. 189
Author(s):  
Charles Bangley ◽  
Roger Rulifson
Keyword(s):  
North Carolina ◽  
Dissolved Oxygen ◽  
Squalus Acanthias ◽  
Late Spring ◽  
Spiny Dogfish ◽  
Northwest Atlantic ◽  
Atlantic Population ◽  
Total Length ◽  
North Carolina Estuary

Five spiny dogfish were captured in early-mid May during gillnet and longline sampling targeting juvenile coastal sharks in inshore North Carolina waters.  Dogfish captures were made within Back Sound and Core Sound, North Carolina. All dogfish were females measuring 849-905 mm total length, well over the size at 50% maturity. Dogfish were caught at stations 1.8-2.7 m in depth, with temperatures 22.9-24.2 °C, 32.8-33.4 ppt salinity, and 6.9-8.0 mg/L dissolved oxygen. These observations are among the latest in the spring for spiny dogfish in the southeastern U.S. and occurred at higher temperatures than previously recorded for this species.  It is unclear whether late-occurring spiny dogfish in this area represent a cryptic late-migrating or resident segment of the Northwest Atlantic population.

Implications of recent increases in catches on the dynamics of Northwest Atlantic spiny dogfish (Squalus acanthias)

1998 ◽  
Vol 39 (2) ◽  
pp. 165-181 ◽  
Author(s):  
P.J. Rago ◽  
K.A. Sosebee ◽  
J.K.T. Brodziak ◽  
S.A. Murawski ◽  
E.D. Anderson
Keyword(s):  
Squalus Acanthias ◽  
Spiny Dogfish ◽  
Northwest Atlantic

Influence of host diet and phylogeny on parasite sharing by fish in a diverse tropical floodplain

Parasitology ◽  
2015 ◽  
Vol 143 (3) ◽  
pp. 343-349 ◽  
Author(s):  
L. B. LIMA ◽  
S. BELLAY ◽  
H. C. GIACOMINI ◽  
A. ISAAC ◽  
D. P. LIMA-JUNIOR
Keyword(s):  
Life History ◽  
Fish Species ◽  
Feeding Habits ◽  
Life History Strategies ◽  
Freshwater Ecosystem ◽  
Fish Diet ◽  
Ecosystem Structure ◽  
Intermediate Hosts ◽  
Host Diet ◽  
Ecological Importance

SUMMARYThe patterns of parasite sharing among hosts have important implications for ecosystem structure and functioning, and are influenced by several ecological and evolutionary factors associated with both hosts and parasites. Here we evaluated the influence of fish diet and phylogenetic relatedness on the pattern of infection by parasites with contrasting life history strategies in a freshwater ecosystem of key ecological importance in South America. The studied network of interactions included 52 fish species, which consumed 58 food types and were infected with 303 parasite taxa. Our results show that both diet and evolutionary history of hosts significantly explained parasite sharing; phylogenetically close fish species and/or species sharing food types tend to share more parasites. However, the effect of diet was observed only for endoparasites in contrast to ectoparasites. These results are consistent with the different life history strategies and selective pressures imposed on these groups: endoparasites are in general acquired via ingestion by their intermediate hosts, whereas ectoparasites actively seek and attach to the gills, body surface or nostrils of its sole host, thus not depending directly on its feeding habits.

scholarly journals Non-dioxin like polychlorinated biphenyl indicator congeners in Northwest Atlantic spiny dogfish (Squalus acanthias)

2017 ◽  
Vol 120 (1-2) ◽  
pp. 414-421 ◽  
Author(s):  
Adam T. St-Gelais ◽  
Christoph Aeppli ◽  
Craig A. Burnell ◽  
Barry A. Costa-Pierce
Keyword(s):  
Polychlorinated Biphenyl ◽  
Squalus Acanthias ◽  
Spiny Dogfish ◽  
Northwest Atlantic

Transatlantic Migrations of Spiny Dogfish (Squalus acanthias)

1976 ◽  
Vol 33 (11) ◽  
pp. 2605-2609 ◽  
Author(s):  
Wilfred Templeman
Keyword(s):  
North Sea ◽  
First Record ◽  
Squalus Acanthias ◽  
Spiny Dogfish ◽  
Northwest Atlantic ◽  
Northern North Sea ◽  
Sea Area

The first record of a west to east transatlantic migration of a tagged spiny dogfish (Squalus acanthias) is reported, 11 yr after liberation at St. Pierre Bank to recapture in the Shetland Isles–northern North Sea area. The most northward and eastward records of spiny dogfish in the northwest Atlantic are presented and discussed in relation to the probable frequency of transatlantic migration. It is concluded that transatlantic migration is not great but probably not highly unusual.

scholarly journals Observations on spiny dogfish (Squalus acanthias) captured in late spring in a North Carolina estuary

F1000Research ◽  
2014 ◽  
Vol 3 ◽  
pp. 189 ◽  
Author(s):  
Charles Bangley ◽  
Roger Rulifson
Keyword(s):  
North Carolina ◽  
Dissolved Oxygen ◽  
Squalus Acanthias ◽  
Late Spring ◽  
Spiny Dogfish ◽  
Size At Maturity ◽  
Seagrass Bed ◽  
Northwest Atlantic ◽  
Atlantic Population ◽  
North Carolina Estuary

Five spiny dogfish were captured in early-mid May during gillnet and longline sampling targeting juvenile coastal sharks in inshore North Carolina waters.  Dogfish captures were made within Back Sound and Core Sound, North Carolina.  All dogfish were females over the size at maturity, and were caught at stations 1.77-2.74 m in depth, with temperatures 22.9-24.2 °C, 32.8-33.4 ppt salinity, and 6.9-8.0 mg/L dissolved oxygen.  Stations where dogfish were captured were approximately 6.5-15.7 km from the nearest inlet and 43.4-247.1 m from the nearest seagrass bed.  These observations are among the latest in the spring for spiny dogfish in the southeastern U.S. and occurred at higher temperatures than previously recorded for this species.  It is unclear whether late-occurring spiny dogfish in this area represent a cryptic late-migrating or resident segment of the Northwest Atlantic population.

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