Does the relative value of submerged aquatic vegetation for penaeid shrimps vary with proximity to a tidal inlet? Preliminary evidence from a subtropical coastal lagoon

2017 ◽  
Vol 68 (3) ◽  
pp. 581 ◽  
Author(s):  
Zeferino Blanco-Martínez ◽  
Roberto Pérez-Castañeda
Keyword(s):  
Submerged Aquatic Vegetation ◽  
Aquatic Vegetation ◽  
Explanatory Variable ◽  
Coastal Lagoons ◽  
Penaeid Shrimp ◽  
Preliminary Evidence ◽  
Tidal Inlet ◽  
Relative Value ◽  
A Site ◽  
Shrimp Abundance

The value of submerged aquatic vegetation (SAV) as a nursery habitat for penaeid shrimp has been recognised previously; however, the importance of SAV in terms of its distance from a tidal inlet (a site through which shrimp postlarvae migrate into coastal lagoons) has not been evaluated. In the present study, the effect of proximity to a tidal inlet on the relative importance of SAV beds for Farfantepenaeus shrimp was evaluated in the Laguna Madre of Tamaulipas (Mexico). Sampling was performed monthly from February to December 2005, diurnally and nocturnally, in two SAV bed areas, one 25km (distant) and the other 1km (nearby) from the inlet. Densities of shrimp (F. aztecus, F. duorarum and F. brasiliensis) were consistently higher in the nearby SAV bed during both the day and night. Water temperature was the most important explanatory variable of shrimp abundance in both SAV beds. The temperature–abundance relationship was negative in all cases, except in the distant SAV bed at night, when shrimp abundance was positively related to dissolved oxygen and salinity. The nearby SAV bed had higher recruit abundance and supported a greater numbers of juveniles and subadults. In contrast, shrimp abundance in the distant SAV bed was apparently limited by recruitment.

Variability in nitrogen content of submerged aquatic vegetation: utility as an indicator of N dynamics within and among lakes

2012 ◽  
Vol 65 (7) ◽  
pp. 1151-1157 ◽  
Author(s):  
Catherine Blanchet ◽  
Gabriel Maltais-Landry ◽  
Roxane Maranger
Keyword(s):  
Nitrogen Content ◽  
Plant Species ◽  
Aquatic Ecosystems ◽  
Submerged Aquatic Vegetation ◽  
Aquatic Vegetation ◽  
Spatial Scales ◽  
Single Site ◽  
N Availability ◽  
N Dynamics ◽  
A Site

Submerged aquatic vegetation (SAV) may serve as an integrative proxy of spatial and temporal nitrogen (N) availability in aquatic ecosystems as plants are physiologically capable of storing variable amounts of N. However, it is important to understand whether plant species behave similarly or differently within and among systems. We sampled different SAV species along a nutrient gradient at multiple sites within several lakes to determine variability in C:N ratios and % N content among species, among plants of the same species at a single site, among sites and among lakes. Species respond differently suggesting that not all plant types can be used universally as nutrient proxies. The greatest variability in % N and C:N ratios for Valliseneria americana was observed among lakes whereas for Elodea canadensis it was among sites within a lake and among plants within a site. This suggests that V. americana could be a particularly useful indicator of N availability at larger spatial scales (regional and within a large fluvial lake) but that E. canadensis was not a particularly useful proxy.

scholarly journals Density-dependent condition of juvenile penaeid shrimps in seagrass-dominated aquatic vegetation beds located at different distance from a tidal inlet

PeerJ ◽  
2020 ◽  
Vol 8 ◽  
pp. e10496
Author(s):  
Zeferino Blanco-Martínez ◽  
Roberto Pérez-Castañeda ◽  
Jesús Genaro Sánchez-Martínez ◽  
Flaviano Benavides-González ◽  
Jaime Luis Rábago-Castro ◽  
...  
Keyword(s):  
Aquatic Vegetation ◽  
Coastal Lagoons ◽  
Negative Relationship ◽  
Tidal Inlet ◽  
Seagrass Beds ◽  
Seagrass Bed ◽  
Density Dependent ◽  
Nursery Habitats ◽  
Shrimp Density ◽  
Penaeid Shrimps

Seagrasses are critical habitats for the recruitment and growth of juvenile penaeid shrimps within estuaries and coastal lagoons. The location of a seagrass bed within the lagoon can determine the value of a particular bed for shrimp populations. Consequently, differences in the abundance of shrimp can be found in seagrasses depending on their location. As shrimp density increases, density-dependent effects on biological parameters are more likely to occur. However, knowledge about density-dependent processes on shrimp populations in nursery habitats remains limited. The present investigation was undertaken to examine the effects of population density on shrimp condition in two selected seagrass beds, located at different distance from a tidal inlet, one 25 km away (distant) and the other 1 km away (nearby), in a subtropical coastal lagoon. The study was based on monthly samplings during one year in Laguna Madre (Mexico), performing a total of 36 shrimp trawls (100 m2 each one) within each seagrass bed (n = 3 trawls per bed per month for 12 months). Shrimp density was related to the proximity to the tidal inlet (higher density was consistently observed in the nearby seagrass bed), which in turn adversely affected the condition of both species studied (Penaeus aztecus and P. duorarum). In this regard, the present study provides the first evidence of density-dependent effects on shrimp condition inhabiting a nursery habitat. Both shrimp species exhibited a negative relationship between condition and shrimp density. However, this pattern differed depending on the proximity to the tidal inlet, suggesting that shrimp populations inhabiting the nearby seagrass bed are exposed to density-dependent effects on condition; whereas, such effects were not detected in the distant seagrass bed. Shrimp density within the distant seagrass bed was probably below carrying capacity, which is suggested by the better shrimp condition observed in that area of the lagoon. Intra and interspecific competition for food items is surmised to occur, predominantly within seagrass beds near the tidal inlet. However, this hypothesis needs to be tested in future studies.

Salinity as a Major Driver for Submerged Aquatic Vegetation in Coastal Lagoons: a Multi-Year Analysis in the Subtropical Laguna de Rocha

2014 ◽  
Vol 38 (2) ◽  
pp. 451-465 ◽  
Author(s):  
Lorena Rodríguez-Gallego ◽  
Viveka Sabaj ◽  
Silvana Masciadri ◽  
Carla Kruk ◽  
Rafael Arocena ◽  
...  
Keyword(s):  
Submerged Aquatic Vegetation ◽  
Aquatic Vegetation ◽  
Coastal Lagoons

Spatial and temporal distribution of submerged aquatic vegetation in a tropical coastal lagoon habitat in Viet Nam

2018 ◽  
Vol 61 (3) ◽  
pp. 213-224 ◽  
Author(s):  
T.T. Hang Phan ◽  
Iris Stiers ◽  
T.T. Huong Nguyen ◽  
T. Tuyet Pham ◽  
T. Phap Ton ◽  
...  
Keyword(s):  
Coastal Lagoon ◽  
Submerged Aquatic Vegetation ◽  
Aquatic Vegetation ◽  
Coastal Lagoons ◽  
Predictor Variable ◽  
Viet Nam ◽  
Total Biomass ◽  
Sediment Types ◽  
Najas Indica ◽  
Wide Range

Abstract Submerged aquatic vegetation (SAV) is considered as a keystone habitat, contributing significantly to structure and function of coastal lagoons. However, limited understanding of the factors driving SAV distribution and abundance across a wide range of salinity in tropical coastal lagoons has restricted the effectiveness of managing and preserving the ecosystem services in coastal lagoon habitats. This study examined the distribution and abundance of SAV species in the growing season in relation to water physico-chemical variables and grain sizes of sediment types in a tropical lagoon in Viet Nam. The results revealed that Najas indica and Halophila beccarii were the dominant species in the community of 7 SAV species, accounting for 70% of the total cover and 55% of the total biomass sampled. Variation partitioning showed that both water and sediment variables were important in explaining spatial distribution and abundance of SAV species across the coastal lagoon. Salinity was the most significant predictor variable that accounted for the variation of SAV species data. The study implied that changes of salinity and silt (versus sand) particles can lead to different SAV assemblages in the lagoon.

Distribution of Farfantepenaeus aztecus and F. duorarum on submerged aquatic vegetation habitats along a subtropical coastal lagoon (Laguna Madre, Mexico)

2009 ◽  
Vol 90 (3) ◽  
pp. 445-452 ◽  
Author(s):  
Roberto Pérez-Castañeda ◽  
Zeferino Blanco-Martínez ◽  
Jesús Genaro Sánchez-Martínez ◽  
Jaime L. Rábago-Castro ◽  
Gabriel Aguirre-Guzmán ◽  
...  
Keyword(s):  
Coastal Lagoon ◽  
Submerged Aquatic Vegetation ◽  
Aquatic Vegetation ◽  
Negative Relationship ◽  
Laguna Madre ◽  
Farfantepenaeus Aztecus ◽  
Seagrass Biomass ◽  
Hypersaline Coastal Lagoon ◽  
Drifting Algae ◽  
Shrimp Abundance

The spatial distribution of Farfantepenaeus shrimp was analysed in the Laguna Madre of Tamaulipas, Mexico. Sampling was carried out on submerged aquatic vegetation (SAV) habitats at five sites located along the coastal lagoon. Two nocturnal surveys were conducted during winter in 2005 (January–February), collecting a total of 3268 shrimp individuals. SAV beds were composed of a mixture of drift algae (mainly Digenia simplex), attached algae (mainly Penicillus capitatus and Udotea occidentalis) and seagrass (mainly Halodule wrightii). Farfantepenaeus aztecus was more abundant (39.5%) than F. duorarum (36.8%), and the remaining 23.7% corresponding to small unidentified Farfantepenaeus spp. were classified as recruits. Abundance of F. aztecus was significantly higher at sites 2 and 4, whereas F. duorarum did not show significant distribution differences along the Laguna Madre. Recruits, juveniles and total shrimp tended to decrease significantly at the northern part of the lagoon (site 1), where substrate was dominated by drifting algae and seagrasses were scarce or absent. The abundance of shrimp was positively related to seagrass biomass and/or water temperature, whereas there was a negligible or negative relationship with algal biomass. With the exception of subadults, a significant positive linear relationship between seagrass and shrimp abundance was fitted, indicating an increase in number of individuals of both species with increasing seagrass biomass. This suggests that seagrass is the most important component of SAV beds influencing the abundance of F. aztecus and F. duorarum along this hypersaline coastal lagoon.

scholarly journals Novel approach for large‐scale monitoring of submerged aquatic vegetation – a nationwide example from Sweden

2021 ◽  
Author(s):  
Silvia Huber ◽  
Lars B. Hansen ◽  
Lisbeth T. Nielsen ◽  
Mikkel L. Rasmussen ◽  
Jonas Sølvsteen ◽  
...  
Keyword(s):  
Large Scale ◽  
Submerged Aquatic Vegetation ◽  
Aquatic Vegetation ◽  
Novel Approach
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