Data Availability
The raw data for Tables 1-3 and Figures 5-6 are online with the supplemental information.
Supplemental Information
Supplemental information for this article are online at …………………………
http://dx.doi.org/10.7717/ peerj.2770#supplemental-information.

Readme file: 

Supplemental Tables-S1 and Table S2 (Table-S1_Durkina_et_al_PeerJ-4841 and Table-S2_Durkina_et_al_PeerJ-4841) are self-explanatory

Blanks in the data set are indicated by “-“

The variables for “Data_Tables-1-3_Durkina_et_al_PeerJ-4841” are:
Date mm/dd/yyyy
Body length (mm)
Brood development- See ms brood development stages F0, FII and FIV
Embryo or oocyte development
Oocyte or ovary condition
Embryo diameter (mm)
Oocyte diameter (mm) F0 females
Oocyte diameter (mm) FII females
Oocyte diameter (mm) FIV females

The variables for “Data_Figure-5_Durkina_et_al_PeerJ-4841” are:
Source (Publication author or date of record for this report)
Species (Genus and species given in publication or used herein)
Average_Body_Length_(mm)
Average_Brood_Count
Embryo_Diameter_(mm)
2015_ED (egg diameter)
A._e._oocytes (Ampelisca eschrichtii oocytes)
F0_VO    ------brood development of female containing vitelogenic oocytes
FII_VO    ------brood development of female containing vitelogenic oocytes
FIV_VO    ------brood development of female containing vitelogenic oocytes
2002+2011 (diameters (mm) of embryos collected from A. eschrichtii in 2002 or 2011)
Wt_Est._ED  (embryo weight estimated from egg diameter)
Coll._Date (date that samples were collected
Fem._Dev. (brood development Fo, FII or FIV)
Development (of eggs or ova)
Condition (overall condition of ova)

The variables for “Data_Figure-6_Durkina_et_al_PeerJ-4841” are:
Species; 
Site; 
Sample#; 
Collection_Region; 
Body_Length_mm; 
Sex; 
Female_Brood_stage (brood development Fo, FII or FIV); 
Jul+Sep2015#Embryos; 
Embryo_Cell_development; 
Collection_Date; 
Expected_Brood_Size; 
Longitude; 
Latitude; 
Depth, m; 
Sediment (composition notes); 
Note (sources of data previous to this report)
1