Use of mixing models for Humboldt squid diet analysis: Reply to Field et al. (2014) REPLY

被引:0
|
作者
Miller, Todd W. [1 ]
Bosley, Keith L. [2 ]
Shibata, Junya [1 ]
Brodeur, Richard D.
Omori, Koji [1 ]
Emmett, Robert [3 ]
机构
[1] Ehime Univ, Global Ctr Excellence, Ctr Marine Environm Studies, Matsuyama, Ehime 7908577, Japan
[2] NOAA, NW Fisheries Sci Ctr, Natl Marine Fisheries Serv, Fishery Resource Anal & Monitoring Div, Newport, OR 97365 USA
[3] NOAA, NW Fisheries Sci Ctr, Natl Marine Fisheries Serv, Fish Ecol Div, Newport, OR 97365 USA
关键词
Dosidicus gigas; Stable isotopes; Trophic level; Source production; NORTHERN CALIFORNIA CURRENT; EUPHAUSIID EUPHAUSIA-PACIFICA; STABLE-ISOTOPE ANALYSIS; DOSIDICUS-GIGAS; VERTICAL MIGRATION; PREY; DELTA-C-13; CARBON;
D O I
10.3354/meps10759
中图分类号
Q14 [生态学(生物生态学)];
学科分类号
071012 ; 0713 ;
摘要
Field et al. (2014; Mar Ecol Prog Ser 500: 281-285) comment on our application of a Bayesian isotope-mixing model (SIAR) to examine the relative contribution of prey from different regions to Dosidicus gigas diet, and point out that our model violated assumptions of D. gigas feeding. We agree in part with their position that the use of SIAR for assessing contributions of sources from different regions for an omnivorous species may be unreliable. However, the results from our study and from the prevailing literature and data indicate that the D. gigas we collected in the Northern California Current (NCC) isotopically matched the NCC baseline and were isotopically distinct from prey resources in the Southern California Current. Field et al.'s (2014) comments on the distribution and abundance of D. gigas in the NCC missed results from the primary literature which show that D. gigas and their purported prey are predominantly distributed along the shelf-slope waters of the NCC, well within the offshore extent of our study. The discrepancy of not finding myctophids as significant sources to D. gigas diet in our study may lie in the fact that our isotope values of myctophids came from adults only, and that smaller conspecifics with lower relative delta N-15 values would have shown a greater contribution from this trophic group. The conclusion we reached of lower trophic level feeding by D. gigas in our study relative to previous diet studies remains valid.
引用
收藏
页码:287 / 290
页数:4
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