scholarly journals Natural stranding of Atlantic sturgeon (Acipenser oxyrinchus Mitchill, 1815) in Scot's Bay, Bay of Fundy, Nova Scotia, from populations of concern in the United States and Canada

2017 ◽  
Vol 33 (3) ◽  
pp. 317-322 ◽  
Author(s):  
N. D. Stewart ◽  
Y. Cormier ◽  
L. M. Logan-Chesney ◽  
G. Gibson ◽  
I. Wirgin ◽  
...  
Keyword(s):  
United States ◽  
Nova Scotia ◽  
The United States ◽  
Bay Of Fundy ◽  
Atlantic Sturgeon ◽  
Acipenser Oxyrinchus

Life in the Slow Lane: Ecology and Conservation of Long-Lived Marine Animals

1999 ◽  
Keyword(s):  
United States ◽  
The United States ◽  
Delaware Bay ◽  
Atlantic Sturgeon ◽  
Population Growth Rates ◽  
Period 1880 ◽  
Spawning Stock ◽  
External Sources ◽  
New Recruits ◽  
Acipenser Oxyrinchus

<em>Abstract.</em> —Atlantic sturgeon <em>Acipenser oxyrinchus oxyrinchus </em> stocks are extremely depleted throughout their range in the United States. We examined two aspects of restoration of Atlantic sturgeon—what level of abundance should be recovered and how long might this level of recovery require? To provide perspective on restoration benchmarks, we estimated historical fishery records for Delaware Bay Atlantic sturgeon. During the period 1880–1900, the Delaware Bay supported the most abundant and commercially important population in the United States. The Leslie depletion method was used to estimate abundance in 1890, a year followed by a 9-yr period of constant depletion. Assumptions of this method were partially met by limited distribution points for the fishery (accuracy of reporting), similarity of fishing practices and fish size during the period of depletion (stable catchability over size-classes) and a 15–20 year lag between depletion of spawning stock and loss of new recruits. Predicted abundance of females, the principal target of the Delaware Bay fishery, was estimated at approximately 1.8 ×10<sup>5</sup>. Based upon a scenario of no directed fishery but continued bycatch of juveniles and constant low annual recruitment of yearlings, restoration to historical levels would require well over a century. Low natural mortality rate in Atlantic sturgeon indicates that additional external sources of mortality, for instance bycatch mortality, can have proportionately large effects on population growth rates.

Anadromous Sturgeons: Habitats, Threats, and Management

2007 ◽  
Keyword(s):  
Large Scale ◽  
Atlantic Coast ◽  
The United States ◽  
Management Plan ◽  
Commercial Fishing ◽  
Atlantic Sturgeon ◽  
Coastal Fisheries ◽  
Number Of Factors ◽  
Acipenser Oxyrinchus ◽  
The U.S

<em>Abstract.</em>—Large-scale commercial fisheries for Atlantic sturgeon <em>Acipenser oxyrinchus</em> in the late 1880s eventually led to substantial reductions in the population size. The coastwide Atlantic sturgeon population of the United States has not recovered to the levels seen prior to the 1900s. A number of factors have contributed to the slow recovery or continued decline of Atlantic sturgeon populations, including continued commercial fishing and the targeting of females for caviar, bycatch in other fisheries, and changes in habitat due to dam construction and water quality degradation. The Atlantic States Marine Fisheries Commission (ASMFC) developed the first coastwide management plan for Atlantic sturgeon in 1990. In response to the shortcomings of that plan, the ASMFC applied new standards and the authority granted to it by the U.S. Congress to adopt a coastwide moratorium on all harvesting in 1998. A federal status review conducted in 1998 concluded that the continued existence of Atlantic sturgeon was not threatened given the situation at the time. Since then, monitoring programs have indicated varying levels of relative abundance in several water bodies along the Atlantic coast. The U.S. government is responsible for undertaking a status review to document any changes since the last review and determining whether those findings warrant a threatened or endangered listing for the species. The government’s findings may have far-reaching effects on many other Atlantic coastal fisheries.

DISTRIBUTION OF CHRYSOLINA SPP. (COLEOPTERA: CHRYSOMELIDAE) IN EASTERN ONTARIO, 18 YEARS AFTER THEIR INITIAL RELEASE

1988 ◽  
Vol 120 (10) ◽  
pp. 937-938 ◽  
Author(s):  
Paul G. Fields ◽  
John T. Arnason ◽  
Bernard J.R. Philogène
Keyword(s):  
United States ◽  
British Columbia ◽  
Weight Gain ◽  
Nova Scotia ◽  
Hypericum Perforatum ◽  
The United States ◽  
Biocontrol Agents ◽  
St John's Wort ◽  
Initial Release ◽  
Eastern Ontario

Hypericum perforatum L., St. John's - wort (Hypericaceae), is a cosmopolitan weed that, when eaten by livestock, causes photodermatitis, reduced weight gain, and, in extreme cases, death (Giese 1980). Chrysolina hyperici (Forester) and Chrysolina quadrigemina (Suffr.) (Coleoptera: Chrysomelidae) dramatically reduced populations of H. perforatum when introduced into Australia (Clark 1953) and the United States (Holloway and Huffaker 1951; Holloway 1957). These species also have served as effective biocontrol agents when introduced into central British Columbia (Smith 1958), Ontario, and Nova Scotia (Harris and Maw 1984). This paper surveys the distribution of Chrysolina spp. in eastern Ontario, 18 years after initial release of both species.

Phryxe vulgaris (Fall.) (Diptera: Tachinidae), a New Parasite of Pieris rapae (L.) (Lepidoptera: Pieridae) in Canada

1957 ◽  
Vol 89 (12) ◽  
pp. 546-546 ◽  
Author(s):  
Marcel Hudon
Keyword(s):  
United States ◽  
Nova Scotia ◽  
New Brunswick ◽  
Pieris Rapae ◽  
The United States ◽  
European Countries ◽  
Pseudaletia Unipuncta ◽  
Northern European ◽  
Parasitic Larva ◽  
Experimental Plots

In July, 1956, a pupa of the imported cabbageworm, Pieris rapae (L.), was found attached to the undersurface of a corn leaf in experimental plots at St. Jean. After the pupa had been incubated at 75°F. for six months, a dipterous parasitic larva emerged and pupated immediately; a tachinid fly emerged two weeks later. The parasite was identified by Mr. J. G. T. Chillcott, Entomology Division, Ottawa, as Phryxe vulgaris (Fall.). P. vulgaris has been reported as a parasite of Pieris rapae, P. brassicae (L.), P. napi (L.), and Vanessa urticae (L.) from many central and northern European countries (Thompson, 1946, pp. 467-469; 1947, p. 598). Aldrich and Webber (1924), Chittenden (1926), and Schaffner and Griswold (1934) reported this parasite from P. rapae in the United States. P. vulgaris has been reported from Canada only on larvae of the armyworm, Pseudaletia unipuncta (Haw.), in Nova Scotia and New Brunswick (Gibson, 1915, p. 14).

The annual marine feeding aggregation of Atlantic sturgeon Acipenser oxyrinchus in the inner Bay of Fundy: population characteristics and movement

2016 ◽  
Vol 89 (4) ◽  
pp. 2107-2132 ◽  
Author(s):  
M. J. Dadswell ◽  
S. A. Wehrell ◽  
A. D. Spares ◽  
M. F. Mclean ◽  
J. W. Beardsall ◽  
...  
Keyword(s):  
Population Characteristics ◽  
Bay Of Fundy ◽  
Atlantic Sturgeon ◽  
Acipenser Oxyrinchus ◽  
Feeding Aggregation
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