TY - JOUR
T1 - Temporal abundance and population parameters of the invasive medusa blackfordia virginica mayer, 1910 (Hydroidomedusae: Blackfordiidae) in pueblo viejo lagoon, mexico
AU - Ocaña-Luna, Alberto
AU - Sánchez-Ramírez, Marina
AU - Islas-García, Alejandro
N1 - Publisher Copyright:
© Ocaña-Luna et al.
PY - 2021/11
Y1 - 2021/11
N2 - The sex ratio, size at first maturity, morphological variations and abundance of the invasive species Blackfordia virginica, were analysed in the lagoon of Pueblo Viejo. Zooplankton were collected with a 505 µm net throughout the lagoon during October and December 1992, March, April, June and August 1993, and March 2009. Data were recorded simultaneously for salinity and temperature. A female/male sex ratio of 0.95:1.00 and a minimum size of gonadic maturity of = 5.25 ± 0.17 mm umbrella diameter were recorded. Blackfordia virginica presented 33 types of morphological variations. The number of marginal tentacles (53–104) increased with size (2.5–13.0 mm). Medusae were collected in this lagoon only in March and April 1993, with average densities of 1,946.75 and 2,508.83 ind/100 m3 respectively. These medusae were recorded at temperatures of 19.0–28.0 °C and salinities of 11.0– 21.0 PSU. The density of B. virginica was highly correlated with salinity (rs = 0.796, n = 114, P < 0.001). The high density of specimens, the wide range of sizes, and the presence of both mature females and males as juveniles indicate that this species can reproduce and develop in this lagoon system. The absence of medusae in March 2009 indicates that the species is not a resident in the system in response to the oligohaline conditions (0.0–7.0 PSU) that are characteristic during June to October.
AB - The sex ratio, size at first maturity, morphological variations and abundance of the invasive species Blackfordia virginica, were analysed in the lagoon of Pueblo Viejo. Zooplankton were collected with a 505 µm net throughout the lagoon during October and December 1992, March, April, June and August 1993, and March 2009. Data were recorded simultaneously for salinity and temperature. A female/male sex ratio of 0.95:1.00 and a minimum size of gonadic maturity of = 5.25 ± 0.17 mm umbrella diameter were recorded. Blackfordia virginica presented 33 types of morphological variations. The number of marginal tentacles (53–104) increased with size (2.5–13.0 mm). Medusae were collected in this lagoon only in March and April 1993, with average densities of 1,946.75 and 2,508.83 ind/100 m3 respectively. These medusae were recorded at temperatures of 19.0–28.0 °C and salinities of 11.0– 21.0 PSU. The density of B. virginica was highly correlated with salinity (rs = 0.796, n = 114, P < 0.001). The high density of specimens, the wide range of sizes, and the presence of both mature females and males as juveniles indicate that this species can reproduce and develop in this lagoon system. The absence of medusae in March 2009 indicates that the species is not a resident in the system in response to the oligohaline conditions (0.0–7.0 PSU) that are characteristic during June to October.
KW - Gonadic maturity
KW - Leptomedusae
KW - Morphological variations
KW - Non-indigenous species
KW - Sex proportion
UR - http://www.scopus.com/inward/record.url?scp=85121258305&partnerID=8YFLogxK
U2 - 10.3391/bir.2021.10.4.07
DO - 10.3391/bir.2021.10.4.07
M3 - Artículo
AN - SCOPUS:85121258305
SN - 2242-1300
VL - 10
SP - 826
EP - 837
JO - BioInvasions Records
JF - BioInvasions Records
IS - 4
ER -