Subtropical pupping ground for a cold-water shark

2010 ◽  
Vol 67 (5) ◽  
pp. 769-773 ◽  
Author(s):  
Steven E. Campana ◽  
Warren Joyce ◽  
Mark Fowler
Keyword(s):  
Life History ◽  
Continental Shelf ◽  
Gulf Stream ◽  
Cold Water ◽  
Mature Female ◽  
Life History Stage ◽  
Sargasso Sea ◽  
Eastern Canada ◽  
Northern And Southern Hemispheres ◽  
Conservation And Management

Porbeagle sharks ( Lamna nasus ) are large pelagic sharks apparently restricted to the cold temperate waters of the northern and southern hemispheres. Despite considerable knowledge of their biology, their pupping (birthing) grounds have never been identified. Pop-up archival transmission tags applied to 21 sharks off eastern Canada indicated that males and immature sharks of both sexes remained primarily on the continental shelf for periods of up to 348 days after tagging. However, mature female porbeagles migrated up to 2356 km through the winter, at depths down to 1360 m beneath the Gulf Stream, to a subtropical pupping ground in the Sargasso Sea. In addition to this pupping ground being well south of their documented range, the placement of such a key life history stage in international, largely unregulated waters poses problems for the conservation and management of a species that is largely fished in Canadian waters.

scholarly journals Mesoscale eddies influence the movements of mature female white sharks in the Gulf Stream and Sargasso Sea

2018 ◽  
Vol 8 (1) ◽  
Author(s):  
Peter Gaube ◽  
Camrin D. Braun ◽  
Gareth L. Lawson ◽  
Dennis J. McGillicuddy ◽  
Alice Della Penna ◽  
...  
Keyword(s):  
Gulf Stream ◽  
Mesoscale Eddies ◽  
Mature Female ◽  
Sargasso Sea

Relationships between temperature and Pacific hake distribution vary across latitude and life-history stage

2020 ◽  
Vol 639 ◽  
pp. 185-197 ◽  
Author(s):  
MJ Malick ◽  
ME Hunsicker ◽  
MA Haltuch ◽  
SL Parker-Stetter ◽  
AM Berger ◽  
...  
Keyword(s):  
Life History ◽  
Environmental Effects ◽  
Environmental Conditions ◽  
Vancouver Island ◽  
Additive Models ◽  
Life History Stage ◽  
Fish Stocks ◽  
Merluccius Productus ◽  
Multiple Dimensions ◽  
Effects Of Temperature

Environmental conditions can have spatially complex effects on the dynamics of marine fish stocks that change across life-history stages. Yet the potential for non-stationary environmental effects across multiple dimensions, e.g. space and ontogeny, are rarely considered. In this study, we examined the evidence for spatial and ontogenetic non-stationary temperature effects on Pacific hake Merluccius productus biomass along the west coast of North America. Specifically, we used Bayesian additive models to estimate the effects of temperature on Pacific hake biomass distribution and whether the effects change across space or life-history stage. We found latitudinal differences in the effects of temperature on mature Pacific hake distribution (i.e. age 3 and older); warmer than average subsurface temperatures were associated with higher biomass north of Vancouver Island, but lower biomass offshore of Washington and southern Vancouver Island. In contrast, immature Pacific hake distribution (i.e. age 2) was better explained by a nonlinear temperature effect; cooler than average temperatures were associated with higher biomass coastwide. Together, our results suggest that Pacific hake distribution is driven by interactions between age composition and environmental conditions and highlight the importance of accounting for varying environmental effects across multiple dimensions.

scholarly journals An extraordinary breach of the Gulf Stream north wall by a cold water intrusion

2002 ◽  
Vol 29 (15) ◽  
pp. 8-1-8-4 ◽  
Author(s):  
Xiaofeng Li ◽  
Timothy F. Donato ◽  
Quanan Zheng ◽  
William G. Pichel ◽  
Pablo Clemente-Colón
Keyword(s):  
Gulf Stream ◽  
Cold Water ◽  
Water Intrusion ◽  
North Wall

Copper complexation in sargasso sea and gulf stream warm-core ring waters

1988 ◽  
Vol 23 (1-2) ◽  
pp. 181-203 ◽  
Author(s):  
Alfred K Hanson ◽  
Carole M Sakamoto-Arnold ◽  
Douglas L Huizenga ◽  
Dana R Kester
Keyword(s):  
Gulf Stream ◽  
Sargasso Sea ◽  
Warm Core ◽  
Warm Core Ring ◽  
Copper Complexation

scholarly journals Involving fishers in scaling up the restoration of cold-water coral gardens on the Mediterranean continental shelf

2021 ◽  
Vol 262 ◽  
pp. 109301
Author(s):  
Maria Montseny ◽  
Cristina Linares ◽  
Núria Viladrich ◽  
Marina Biel ◽  
Nuno Gracias ◽  
...  
Keyword(s):  
Continental Shelf ◽  
Cold Water ◽  
Scaling Up ◽  
The Mediterranean ◽  
Water Coral

Evidence of long and discontinuous juvenile periods in Trillium catesbaei under contrasting levels of herbivory

Botany ◽  
2014 ◽  
Vol 92 (1) ◽  
pp. 77-81 ◽  
Author(s):  
Christopher R. Webster ◽  
Michael A. Jenkins
Keyword(s):  
Life History ◽  
Reproductive Success ◽  
Age Structure ◽  
Morphological Characteristics ◽  
Population Viability ◽  
Plant Age ◽  
Life History Stage ◽  
Structure And Morphology ◽  
Single Leaf ◽  
Poor Indicator

We investigated the influence of chronic herbivory by white-tailed deer (Odocoileus virginianus (Zimmermann, 1780)) on the age structure and morphology of Trillium catesbaei Elliott. At sites with contrasting histories of deer abundance (Cades Cove, high; Whiteoak Sink, low), we measured morphological characteristics and determined minimum plant age for 60 plants (30 per site) in the single-leaf life-history stage. We chose this stage because its presence is considered an indication of successful reproduction by the previous generation, but its value could be inflated if plants regress or remain in this stage for extended periods. Our results suggest that T. catesbaei may spend upwards of a decade in this stage. Cades Cove single leaves were significantly older (p = 0.011) than those at Whiteoak Sink. Rhizome recession (decay of the oldest portion) was more common at Cades Cove, suggesting greater regression to this stage from three-leaf stages. Although minimum plant age was significantly associated with vegetative attributes (p < 0.002) at Whiteoak Sink, these attributes were decoupled at Cades Cove (p ≥ 0.642). Collectively, our results suggest that chronic herbivory may lead to a long and regressive residency period in the single-leaf stage. Consequently, in Trillium populations heavily impacted by deer, the number of single-leaf plants may be a poor indicator of reproductive success and population viability.

scholarly journals Direct observations of American eels migrating across the continental shelf to the Sargasso Sea

2015 ◽  
Vol 6 (1) ◽  
Author(s):  
Mélanie Béguer-Pon ◽  
Martin Castonguay ◽  
Shiliang Shan ◽  
José Benchetrit ◽  
Julian J. Dodson
Keyword(s):  
Continental Shelf ◽  
Sargasso Sea ◽  
Direct Observations ◽  
American Eels

Notes on Life-History and Parasites of Syngrapha epigaea (Grt.) (Lepidoptera: Noctuidae)

1960 ◽  
Vol 92 (10) ◽  
pp. 759-761
Author(s):  
G. W. Wood ◽  
W. T. A. Neilson
Keyword(s):  
Life History ◽  
Insect Pests ◽  
Common Species ◽  
Eastern Canada ◽  
Lepidoptera Noctuidae

It is perhaps because of their unimportance as insect pests that larvae of the genus Syngrapha have been so little studied. Syngrapha epigaea is no exception to this; but since it is one of the most common species of larvae found in commercial blueberry fields of eastern Canada, the following notes on its life-history and parasitism are here recorded.

scholarly journals Impact of the Atlantic Meridional Mode on Gulf Stream North Wall Position

2018 ◽  
Vol 31 (21) ◽  
pp. 8875-8894 ◽  
Author(s):  
Sultan Hameed ◽  
Christopher L. P. Wolfe ◽  
Lequan Chi
Keyword(s):  
Gulf Stream ◽  
Cold Water ◽  
Meridional Overturning Circulation ◽  
Major Influence ◽  
Tropical Atlantic ◽  
The North ◽  
Meridional Mode ◽  
North Wall ◽  
Atlantic Meridional Mode ◽  
Wall Position

The path of the Gulf Stream as it leaves the continental shelf near Cape Hatteras is marked by a sharp gradient in ocean temperature known as the North Wall. Previous work in the literature has considered processes related to the North Atlantic Oscillation (NAO) in triggering latitudinal displacements of the North Wall position. This paper presents evidence that the Atlantic meridional mode (AMM) also impacts interannual variations of the North Wall position. The AMM signal from the tropics propagates to the Gulf Stream near the 200-m depth, and there are two time scales for this interaction. Anomalous Ekman suction induced by AMM cools the tropical Atlantic. The cold water in the Caribbean Sea is entrained into the currents feeding the Gulf Stream, and this cooling signal reaches the North Wall within a year. A second mechanism involves cold anomalies in the western tropical Atlantic, which initially propagate westward as baroclinic planetary waves, reaching the Gulf Stream and resulting in a southward shift in the North Wall position after a delay of about one year. In an analysis for the period 1961–2015, AMM’s signal dominates North Wall fluctuations in the upper 300 m, while NAO is the major influence below ~500 m; the influence of both the teleconnections is seen between 300 and 500 m. The relationship between the Atlantic meridional overturning circulation (AMOC) and the North Wall is investigated for the 2005–15 period and found to be statistically significant only at the sea surface in one of the three North Wall indices used.

scholarly journals Thermal strategies vary with life history stage

2018 ◽  
Vol 221 (8) ◽  
pp. jeb171629 ◽  
Author(s):  
Manuela Truebano ◽  
Phillip Fenner ◽  
Oliver Tills ◽  
Simon D. Rundle ◽  
Enrico L. Rezende
Keyword(s):  
Life History ◽  
Life History Stage
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