scholarly journals Trees, Shrubs and Vines for the North-eastern United States

Nature ◽  
1946 ◽  
Vol 158 (4022) ◽  
pp. 772-772
Author(s):  
N. K. GOULD
Keyword(s):  
United States ◽  
Eastern United States ◽  
The North ◽  
North Eastern

Regional variability in extinction thresholds for forest birds in the north-eastern United States: an examination of potential drivers using long-term breeding bird atlas datasets

2015 ◽  
Vol 21 (6) ◽  
pp. 686-697 ◽  
Author(s):  
Yntze van der Hoek ◽  
Andrew M. Wilson ◽  
Rosalind Renfrew ◽  
Joan Walsh ◽  
Paul G. Rodewald ◽  
...  
Keyword(s):  
United States ◽  
Forest Birds ◽  
Eastern United States ◽  
Regional Variability ◽  
Breeding Bird ◽  
The North ◽  
Breeding Bird Atlas ◽  
North Eastern

A Sibling Species Group of Hydractinia in the North-Eastern United States

1989 ◽  
Vol 69 (4) ◽  
pp. 857-874 ◽  
Author(s):  
Leo W. Buss ◽  
Philip O. Yund
Keyword(s):  
United States ◽  
Sibling Species ◽  
Host Species ◽  
Larval Dispersal ◽  
Phylogenetic Reconstruction ◽  
Species Group ◽  
Eastern United States ◽  
The North ◽  
North Eastern ◽  
Symbiotic Organisms

Many symbiotic organisms are narrowly distributed on one or a few host species. These associations are intriguing, as they invite the development of hypotheses regarding the pattern and process of speciation and serve as laboratories for the testing of methods of phylogenetic reconstruction (Kraus, 1978; Futuyma & Slatkin, 1983; Stone & Hawks worth, 1986). The evolution of host-specificity in the sea may be expected to be severely constrained by the difficulty of achieving reproductive isolation in taxa whose gametes are freely released into the water column and/or whose larvae are potentially widely distributed (Scheltema, 1977). Yet this difficulty may well be overestimated, given the recent demonstrations of limited gamete (Pennington, 1985; Yund, in press) and larval dispersal (Knight-Jones & Moyse, 1961; Ryland, 1981; Olsen, 1985; Jackson & Coates, 1986; Grosberg, 1987). Indeed, if gamete and larval dispersal are as limited as has recently been contended (Jackson, 1986), local isolation of populations may be a routine occurence, offering repeated opportunities for speciation.

scholarly journals The recent development of melanism in the larvæ of certain species of Lepidoptera, with an account of its inheritance in Selenia bilunaria esp

1932 ◽  
Vol 111 (770) ◽  
pp. 188-200 ◽  
Keyword(s):  
United States ◽  
Central Europe ◽  
The United States ◽  
Eastern United States ◽  
Evolutionary Processes ◽  
Number Of Species ◽  
The North ◽  
North Eastern ◽  
Geometrid Moth ◽  
State Of Affairs

One of the most remarkable evolutionary processes, the more striking since it has occured before our eyes, has been the rise and spread of melanism and melanochroism amongst the Lepidopetera. Commencing about 1850 in the Manchester area in England with the Geometrid moth Amphidasys betularia L., which yielded the black form carbonaria Jord. ( doubledayaria Mill.), this development has proceeded so rapidly, and become so widespread, that now there is scarcely a country in Northern and Central Europe which does not produce its quota of melanic insects. Moreover, the same state of affairs exists in the North-Eastern United States, although there the number of species affected, up to the present, is not so great as in Europe. Another important feature about these changes lies in the circumstance that, almost uniformly, in Europe and in the United States, the first species to exhibit melanism in any given area have been Amphidasys betularia and Tephrosia crepuscularia . From the beginning, the Geometridæ, more especially the subfamily Boarmiinæ, have provided not only the bulk of the melanic varieties, but also the greatest numbers of individuals. In many areas, as for example in the case of A. betularia and Y psipetes trifasciata , only black examples occur. Nevertheless, other groups include species which have gone black; for instance, the Noctuidæ present black forms of Aplecta nebulosa Hufn., the Cymatophoridæ of Cymatophora or F., the Arctiidæ of Spilosoma lubricipeda L., the Gelechiidæ of Chimabacche fagella F., and so on.

Rates of retained and discarded catches from demersal fish trawling off the north-eastern United States

1997 ◽  
Vol 48 (3) ◽  
pp. 185 ◽  
Author(s):  
S. J. Kennelly ◽  
S. C. Drew ◽  
C. D. Delano Gagnon
Keyword(s):  
United States ◽  
Large Scale ◽  
Demersal Fish ◽  
Statistical Analyses ◽  
Individual Species ◽  
Eastern United States ◽  
Spatial And Temporal Patterns ◽  
The North ◽  
North Eastern ◽  
Catch Rates

The retained- and discarded-catch rates of fish, crustaceans and molluscs caught by demersal fish trawlers were quantified in a large-scale observer survey of fleets working off the north-eastern United States. The data presented come from catches sampled from 7757 tows on 1010 fishing trips during the four-year period from July 1990 to June 1994 and are summarized as the weights retained and discarded (per hour of trawling) for many of the important commercial and recreational species in the region. Problems with the spatial and temporal design of the programme restricted statistical analyses of the data and prevented summaries across all statistical areas and months. However, separate summaries for individual areas (over all months) and individual months (over all areas) identified several spatial and temporal patterns in retained- and discarded-catch rates for individual species and combinations of species. Noticeable increases and decreases in catch rates during the four-year period provided information on the relative health of certain stocks, and overall discard percentages indicated relative selectivities of the trawling operations sampled.

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