Influence of environmental variables on the abundance and distribution of the deep-water shrimps Nematocarcinus faxoni Burukovsky, 2001 and N. agassizii Faxon, 1893 (Crustacea, Decapoda, Nematocarcinidae) off Western Mexico
Papiol, V.; Hernandez-Payan, J.C.; Hendrickx, M.E. (2020). Influence of environmental variables on the abundance and distribution of the deep-water shrimps Nematocarcinus faxoni Burukovsky, 2001 and N. agassizii Faxon, 1893 (Crustacea, Decapoda, Nematocarcinidae) off Western Mexico, in: Hendrickx, M.E. Deep-sea pycnogonids and crustaceans of the Americas. pp. 273-292. https://dx.doi.org/10.1007/978-3-030-58410-8_11
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| Keywords |
Caridea [WoRMS]; Nematocarcinus agassizii Faxon, 1893 [WoRMS]; Nematocarcinus faxoni Burukovsky, 2001 [WoRMS]
Marine/Coastal |
| Author keywords |
Deep-sea; Caridean shrimps; Ecology; East Pacific; Oxygen minimum zone |
| Authors | | Top |
- Papiol, V.
- Hernandez-Payan, J.C.
- Hendrickx, M.E.
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| Abstract |
Two species of the deep-water caridean shrimp genus Nematocarcinus were collected off western Mexico: N. agassizii (6 samples) and N. faxoni (56 samples). The specimens were collected using benthic gear (i.e., benthic sledge and Agassiz dredge) during a series of 12 cruises (228 samples) in the Mexican Pacific and inside the Gulf of California. At each locality, near-bottom temperature, salinity, and dissolved oxygen were measured, and the organic carbon content in the sediments was analyzed. Nematocarcinus faxoni was distributed along all the Mexican Pacific coasts, and N. agassizii was only collected off the western Baja California Peninsula. The density of the two species peaked at different depths, N. agassizii at 701–1000 m and N. faxoni at 1001–1300 m, bathymetric changes in density being overall significant for both species. The females of both species were significantly larger than males, and ovigerous females were larger than the rest of the females. Ovigerous females of N. faxoni measured 17.96–28.33 mm (CL) and those of N. agassizii measured 23.32–31.90 mm. The size of N. faxoni changed with depth, smaller organisms were not collected deeper than 1600 m, and greater proportions of large organisms were found at greater depths. Overall sex ratio was M/F = 1:2, except at 1301–1600 (M/F = 1:1). High densities of N. faxoni were recorded at temperature ranging 3.5–6.5 °C, DO ranging 0–0.5 ml/l, and salinity ranging 34.5–34.6 and 34.7–34.8, and in sediments with 1–2% organic carbon content. Specimens of N. agassizii were mainly found at temperature between 5 and 6 °C and aggregated mostly at DO of 0–0.5 ml/l. No particular trend was found regarding salinity and organic carbon in the sediments. Generalized additive models revealed that the distribution of N. faxoni was associated with environments with intermediate salinity, low organic carbon content in the sediments, and high temperature. Nematocarcinus agassizii distribution was associated with lower salinity and higher organic carbon content than N. faxoni. |
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