Genetic-linked polymodal emergence
Posted: Wed Oct 05, 2022 9:05 pm
The Tiger Swallowtails (Papilio glaucus) of Upstate NY and Ontario CA exhibit a bimodal emergence; this has of late been attributed to the later flight being called "Mid Summer Tiger Swallowtail" (MST) by the Canadians, and many of you know I have a running thread on this.
But I stumbled on this in the paper Polymodal emergence of the tiger swallowtail, Papilio glaucus (Lepidoptera: Papilionidae): source of a false second generation in central New York State ROBERT H. HAGEN and ROBERT C. LEDERHOUSE* 1985:
early recognition of polymodal emergence in Eurytides rnarcellus was due solely to phenological differences in the adults associated with emergence time (Edwards, 1897). Our results suggest that polymodal emergence within a season may be masked by its resemblance to a truly bivoltine life cycle.
Looking for this paper I stumbled on POLYMORPHIC TERMINATION OF DIPAUSE in' CECROPIA: GENETIC AND GEOGRAPHICAL ASPECTS G. P. WALDBAUER AND J. G. STERNBURG 1973. This paper demonstrates that (at least in part of Illinois in 1970s) cecropia were split into two distinct groups which had different emergence periods. One group did not beget the other; the first group's offspring would emerge when the parents did, and the second group likewise. In other words, the early group would always emerge early, never later- so it's not like one generation emerging at two periods, it's two separate generations emerging at two separate times.
Further, the above reference states: It has long been known that the emergence of the zebra swallowtail (Eurytides mar cell us) from overwintering pupae is bimodal, and that in this case the dimorphism involves color and form as well as physiology (Scudder, 1889,pages 1273- 1278).
It may have been known, or as put in another publication "we've known" a long time that the "spring form" and "summer form" of marcellus are not two generations of progeny from the same group, but in fact are separate groups that have different morphology, however NOBODY EVER TOLD ME.
That cecropia exhibits bimodal emergence is amazing to me. I wonder if the spring and summer forms of luna are bimodal emergence.
Anyone have any more insights into this thing that's been kept secret from me?
But I stumbled on this in the paper Polymodal emergence of the tiger swallowtail, Papilio glaucus (Lepidoptera: Papilionidae): source of a false second generation in central New York State ROBERT H. HAGEN and ROBERT C. LEDERHOUSE* 1985:
early recognition of polymodal emergence in Eurytides rnarcellus was due solely to phenological differences in the adults associated with emergence time (Edwards, 1897). Our results suggest that polymodal emergence within a season may be masked by its resemblance to a truly bivoltine life cycle.
Looking for this paper I stumbled on POLYMORPHIC TERMINATION OF DIPAUSE in' CECROPIA: GENETIC AND GEOGRAPHICAL ASPECTS G. P. WALDBAUER AND J. G. STERNBURG 1973. This paper demonstrates that (at least in part of Illinois in 1970s) cecropia were split into two distinct groups which had different emergence periods. One group did not beget the other; the first group's offspring would emerge when the parents did, and the second group likewise. In other words, the early group would always emerge early, never later- so it's not like one generation emerging at two periods, it's two separate generations emerging at two separate times.
Further, the above reference states: It has long been known that the emergence of the zebra swallowtail (Eurytides mar cell us) from overwintering pupae is bimodal, and that in this case the dimorphism involves color and form as well as physiology (Scudder, 1889,pages 1273- 1278).
It may have been known, or as put in another publication "we've known" a long time that the "spring form" and "summer form" of marcellus are not two generations of progeny from the same group, but in fact are separate groups that have different morphology, however NOBODY EVER TOLD ME.
That cecropia exhibits bimodal emergence is amazing to me. I wonder if the spring and summer forms of luna are bimodal emergence.
Anyone have any more insights into this thing that's been kept secret from me?