scholarly journals Habitat deterioration promotes the evolution of direct development in metamorphosing species

Evolution ◽  
2020 ◽  
Vol 74 (8) ◽  
pp. 1826-1850
Author(s):  
Hanna ten Brink ◽  
Renske E. Onstein ◽  
André M. de Roos
Keyword(s):  
Direct Development ◽  
Habitat Deterioration

The Reproductive Biology of Ophiacantha Bidentata (Echinodermata: Ophiuroidea) From The Rockall Trough

1982 ◽  
Vol 62 (1) ◽  
pp. 45-55 ◽  
Author(s):  
P. A. Tyler ◽  
J. D. Gage
Keyword(s):  
Reproductive Biology ◽  
Deep Water ◽  
Larval Stage ◽  
North Pacific ◽  
Deep Sea ◽  
Direct Development ◽  
The Arctic ◽  
Shallow Waters ◽  
Arctic Seas ◽  
Rockall Trough

INTRODUCTIONOphiacantha bidentata (Retzius) is a widespread arctic-boreal ophiuroid with a circumpolar distribution in the shallow waters of the Arctic seas and penetrating into the deep sea of the.North Atlantic and North Pacific (Mortensen, 1927, 1933a; D'yakonov, 1954). Early observations of this species were confined to defining zoogeo-graphical and taxonomic criteria including the separation of deep water specimens as the variety fraterna (Farran, 1912; Grieg, 1921; Mortensen, 1933a). Mortensen (1910) and Thorson (1936, pp. 18–26) noted the large eggs (o.8 mm diameter) in specimens from Greenland and Thorson (1936) proposed that this species had ‘big eggs rich in yolk, shed directly into the sea. Much reduced larval stage or direct development’. This evidence is supported by observations of O. bidentata from the White and Barents Seas (Semenova, Mileikovsky & Nesis, 1964; Kaufman, 1974)..

PHOTOPERIODIC CONTROL OF DEVELOPMENT AND PHENOTYPE IN A SUBARCTIC POPULATION OF PIERIS OCCIDENTALIS (LEPIDOPTERA: PIERIDAE)

1975 ◽  
Vol 107 (7) ◽  
pp. 775-779 ◽  
Author(s):  
Arthur M. Shapiro
Keyword(s):  
Sierra Nevada ◽  
Continuous Light ◽  
Direct Development ◽  
Source Population ◽  
Photoperiodic Control ◽  
Temperature Regimes

AbstractPieris occidentalis nelsoni W. H. Edwards from Fairbanks, Alaska, was reared under a variety of photoperiod–temperature regimes. The source population is presumably univoltine and monophenic, with a phenotype resembling the vernal one produced by multivoltine, diphenic P. o. occidentalis Reakirt in Colorado and California. Photoperiods of 10 or 15 h produced 100% diapause pupae at 15 °C and circa 65% at 25 °C. Under continuous light 22% diapaused at 15 °C and < 1% at 25 °C. About 20% of non-diapause pupae produced adults resembling the estival phenotype of P. o. occidentalis, which is unknown in wild P. o. nelsoni. Although nelsoni is more likely to diapause than the nominate subspecies from the Sierra Nevada, its potential for direct development and polyphenism is interpreted as evidence that it is derived from a multivoltine ancestor.

scholarly journals Direct Development in the Sea UrchinPhyllacanthus parvispinus(Cidaroidea): Phylogenetic History and Functional Modification

1989 ◽  
Vol 177 (1) ◽  
pp. 96-109 ◽  
Author(s):  
ANNETTE L. PARKS ◽  
BRENT W. BISGROVE ◽  
GREGORY A. WRAY ◽  
RUDOLF A. RAFF
Keyword(s):  
Direct Development ◽  
Functional Modification

Silkworm strains that can be clearly destined towards either embryonic diapause or direct development by adjusting a single ambient parameter during the preceding generation

2014 ◽  
Vol 17 (4) ◽  
pp. 396-399 ◽  
Author(s):  
Yuichi Egi ◽  
Shion Akitomo ◽  
Tsuguru Fujii ◽  
Yutaka Banno ◽  
Katsuhiko Sakamoto
Keyword(s):  
Direct Development ◽  
Embryonic Diapause
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