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Seasonal changes of fish assemblages in a subtropical lagoon in the SE Gulf of California.

Amezcua F, Amezcua-Linares F - ScientificWorldJournal (2014)

Bottom Line: The majority of the species found were demersal but in every season at least one pelagic or benthopelagic species showed high abundances.The species composition changed seasonally; results from the Simpson diversity index and the cumulative species curve show that seasonally almost all the species in the system for a given season were found.These changes were also reflected in the multivariate results.

View Article: PubMed Central - PubMed

Affiliation: Instituto de Ciencias del Mar y Limnología, Universidad Nacional Autónoma de México, Joel Montes Camarena S/N, Mazatlán, Sin., 82040, Mexico.

ABSTRACT
The composition and seasonal changes of the fish assemblage in a coastal lagoon system in southeastern Gulf of California were assessed from December 2001 to July 2005. A total of 20,877 organisms belonging to 191 species and 47 families were analyzed. We determined that almost all the species inhabiting the system were found; however some rare species were not captured in our study. The majority of the species found were demersal but in every season at least one pelagic or benthopelagic species showed high abundances. The moonfish, Selene peruviana, was the most abundant species, whilst the puffer, Sphoeroides annulatus, was the main species in terms of biomass. The species composition changed seasonally; results from the Simpson diversity index and the cumulative species curve show that seasonally almost all the species in the system for a given season were found. These changes were also reflected in the multivariate results. The seasonal variations could be attributed to the migration of species out of the system as they grow and the arrival of new ones, which could also be related to temperature patterns since this environmental factor changes considerably through the year.

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MDS plot showing the ordination of the samples according to season and year.
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Related In: Results  -  Collection


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fig6: MDS plot showing the ordination of the samples according to season and year.

Mentions: Season and year influenced the arrangement of the fish assemblage, and groups were formed according to these two factors (MDS plot, stress = 0.14) (Figure 6); data from the different seasons was grouped together, as well as data from the same years. These groups were corroborated by the ANOSIM; data from winter was significantly different from that of spring (R-statistic = 0.778, P < 0.1) and summer (R-statistic = 0.878, P < 0.1), with no significant differences between spring and summer seasons (R-statistic = 0.0, P > 0.5). The data from 2002 was significantly different from the data of 2004 (R-statistic = 0.985, P < 0.1) and 2005 (R-statistic = 0.979, P < 0.1), with no differences found between 2004 and 2005 (R-statistic = 0.002, P > 0.5). The species responsible for these differences varied seasonally. SIMPER results indicated that Opisthopterus dovii and Peprilus medius were more abundant during spring, and E. currani and Sphoeroides lobatus were more abundant during summer than winter. In terms of annual differences, E. crossotus was more abundant during 2004-2005 than during 2002, E. gracilis was more abundant during 2004, and P. nitidus was more abundant during 2005 than during 2002.


Seasonal changes of fish assemblages in a subtropical lagoon in the SE Gulf of California.

Amezcua F, Amezcua-Linares F - ScientificWorldJournal (2014)

MDS plot showing the ordination of the samples according to season and year.
© Copyright Policy - open-access
Related In: Results  -  Collection

Show All Figures
getmorefigures.php?uid=PMC3927869&req=5

fig6: MDS plot showing the ordination of the samples according to season and year.
Mentions: Season and year influenced the arrangement of the fish assemblage, and groups were formed according to these two factors (MDS plot, stress = 0.14) (Figure 6); data from the different seasons was grouped together, as well as data from the same years. These groups were corroborated by the ANOSIM; data from winter was significantly different from that of spring (R-statistic = 0.778, P < 0.1) and summer (R-statistic = 0.878, P < 0.1), with no significant differences between spring and summer seasons (R-statistic = 0.0, P > 0.5). The data from 2002 was significantly different from the data of 2004 (R-statistic = 0.985, P < 0.1) and 2005 (R-statistic = 0.979, P < 0.1), with no differences found between 2004 and 2005 (R-statistic = 0.002, P > 0.5). The species responsible for these differences varied seasonally. SIMPER results indicated that Opisthopterus dovii and Peprilus medius were more abundant during spring, and E. currani and Sphoeroides lobatus were more abundant during summer than winter. In terms of annual differences, E. crossotus was more abundant during 2004-2005 than during 2002, E. gracilis was more abundant during 2004, and P. nitidus was more abundant during 2005 than during 2002.

Bottom Line: The majority of the species found were demersal but in every season at least one pelagic or benthopelagic species showed high abundances.The species composition changed seasonally; results from the Simpson diversity index and the cumulative species curve show that seasonally almost all the species in the system for a given season were found.These changes were also reflected in the multivariate results.

View Article: PubMed Central - PubMed

Affiliation: Instituto de Ciencias del Mar y Limnología, Universidad Nacional Autónoma de México, Joel Montes Camarena S/N, Mazatlán, Sin., 82040, Mexico.

ABSTRACT
The composition and seasonal changes of the fish assemblage in a coastal lagoon system in southeastern Gulf of California were assessed from December 2001 to July 2005. A total of 20,877 organisms belonging to 191 species and 47 families were analyzed. We determined that almost all the species inhabiting the system were found; however some rare species were not captured in our study. The majority of the species found were demersal but in every season at least one pelagic or benthopelagic species showed high abundances. The moonfish, Selene peruviana, was the most abundant species, whilst the puffer, Sphoeroides annulatus, was the main species in terms of biomass. The species composition changed seasonally; results from the Simpson diversity index and the cumulative species curve show that seasonally almost all the species in the system for a given season were found. These changes were also reflected in the multivariate results. The seasonal variations could be attributed to the migration of species out of the system as they grow and the arrival of new ones, which could also be related to temperature patterns since this environmental factor changes considerably through the year.

Show MeSH