Integrating Hydroacoustic and Optical Video Technologies to Identify the Riverbed Substrate at the Spawning Reach of Chinese Sturgeon

2014 ◽  
Vol 955-959 ◽  
pp. 1235-1240 ◽  
Author(s):  
Hui Zhang ◽  
Cheng You Wang ◽  
Hao Du ◽  
Jin Ming Wu ◽  
Li Shen ◽  
...  
Keyword(s):  
Fish Species ◽  
Site Selection ◽  
Critically Endangered ◽  
Chinese Sturgeon ◽  
Endangered Fish ◽  
Acoustic Backscattering ◽  
Spawning Site ◽  
The Relationship ◽  
Medium Diameter ◽  
Selection Of

Riverbed substrate is important to many riverine organisms, however, it is normally difficult to study the substrate intensively especially in large and fast flowing rivers. The Chinese sturgeon Acipenser sinensis is a critically endangered fish species, it spawns on a specific riverbed substrate. In this paper, the hydroacoustic and underwater optical video technologies were integrated to study the riverbed substrate at the only remaining spawning area of the fish. Sixteen samples were firstly studied to verify the relationship between acoustic backscattering characteristics (hardness and roughness) and video observed characteristics (embeddedness and medium diameter of the grain). Then eight vertical mobile hydroacoustic surveys were conducted to acoustically map the 16 km spawning reach. The results revealed that the heterogeneous mix of boulder/cobble and sand was the dominant substrate at the spawning reach. However, the embeddedness and medium diameter of the grain varied within the area which tend to affect the spawning site selection of the fish. This study indicated that the combination of hydroacoustic and optical video technologies could be very useful to study the riverbed substrate in river ecological issues.

Spawning Site Selection of the Endangered Horseshoe Crab Tachyplenus Tridentatus at Tsuyazaki Cove in Fukuoka, Japan

APAC 2019 ◽  
2019 ◽  
pp. 959-963
Author(s):  
Shinji Itaya ◽  
Satoque Seino ◽  
Mari Shuuno ◽  
Ayumu Sakurada ◽  
Ryuto Koshiguchi
Keyword(s):  
Site Selection ◽  
Horseshoe Crab ◽  
Spawning Site ◽  
Selection Of

scholarly journals The Effect of Different Habitat Types and Ontogenetic Stages on the Diet Shift of a Critically Endangered Fish Species, Coreius guichenoti (Sauvage and Dabry de Thiersant, 1874)

2018 ◽  
Vol 15 (10) ◽  
pp. 2240 ◽  
Author(s):  
Zhi Yang ◽  
Xiaojuan Chen ◽  
Na Zhao ◽  
Huiyuan Tang ◽  
Jiangping Tao ◽  
...  
Keyword(s):  
Fish Species ◽  
Critically Endangered ◽  
Food Sources ◽  
Three Gorges Reservoir Area ◽  
Diet Shift ◽  
Isotopic Niche ◽  
Spawning Ground ◽  
Habitat Types ◽  
Endangered Fish ◽  
Ontogenetic Stages

This study examined the effect of habitat types and ontogenetic stages on the diet shift of Coreius guichenoti (Sauvage and Dabry de Thiersant, 1874), a critically endangered fish species. Based on the stable isotope analysis method, the following was explored: the variations in δ13C and δ15N values, isotopic niche width and four basal food sources (Mollusks, Macrocrustaceans, Aquatic insect larvae and particulate organic matters (POMs)) among three essential habitat types (the spawning ground, natural riverine feeding and nursery area, and Three Gorges Reservoir area) and between two ontogenetic stages (immature and fully mature stages). A diet shift associated with habitat type changes was observed, but there were no obvious differences in diet composition between the two ontogenetic stages. Dietary plasticity and a preference for specific foods were the important determinants of feeding behavior through the life history of this species. POM was important for the survival of this species in the resource-limited spawning ground, but this species fed more heavily on higher-order consumers in resource-abundant areas. This study highlights the importance of maintaining free connectivity among different habitats (particularly spawning grounds) to ensure the long-term sustainability of potamodromous fish species as well as the full investigation of all types of critical habitats for understanding the trophic ecology of a single fish species.

scholarly journals Habitat use by two extremophile, highly endemic, and critically endangered fish species (Gambusia eurystoma and Poecilia sulphuraria ; Poeciliidae)

2016 ◽  
Vol 26 (6) ◽  
pp. 1155-1167 ◽  
Author(s):  
Zachary W. Culumber ◽  
Garrett W. Hopper ◽  
Nicholas Barts ◽  
Courtney N. Passow ◽  
Samuel Morgan ◽  
...  
Keyword(s):  
Habitat Use ◽  
Fish Species ◽  
Critically Endangered ◽  
Endangered Fish

Salt tolerance of Rana temporaria: spawning site selection and survival during embryonic development (Amphibia, Anura)

1999 ◽  
Vol 20 (2) ◽  
pp. 161-171 ◽  
Author(s):  
Bruno Viertel
Keyword(s):  
Salt Tolerance ◽  
Site Selection ◽  
Nature Reserve ◽  
Developmental Stages ◽  
Rana Temporaria ◽  
Ion Concentrations ◽  
Spawning Site ◽  
Time Period ◽  
Effect Concentration ◽  
Selection Of

AbstractSpawning site selection of Rana temporaria is dependent on the salinity of the water. In the nature reserve 'Salzwiesen von Münzenberg' (Germany) the frogs avoided increased conductivity values, Cl- ion concentrations and salinities and selected lower values for spawning. In the laboratory Gosner stages 20/21 to 22/23 were more sensitive to sodium than the earlier G stages 8 to 20/21 (exposition for 72 h) though they were exposed for the shorter time period of 24 h. The 'no observed effect concentration' (NOEC) between G stages 8/9 and 20/21 was 648 ppm (3350 μS, 2.2‰ salinity) for Na+ and 1872 ppm (6500 μS, 4.0‰ salinity) for K+. The NOEC between G stages 20/21 and 22/23 was 1490 ppm (7400 μS, 4.5‰ salinity) for Na+ and for K+ also 1872 ppm (6500 μS, 4.0‰ salinity). All developmental stages tolerated much higher ion concentrations and conductivity values in the laboratory than the adult frogs selected for spawning.

scholarly journals Assessment of instream structures for habitat improvement for two critically endangered fish species

2010 ◽  
Vol 45 (1) ◽  
pp. 113-124 ◽  
Author(s):  
I. Boavida ◽  
J. M. Santos ◽  
R. V. Cortes ◽  
A. N. Pinheiro ◽  
M. T. Ferreira
Keyword(s):  
Fish Species ◽  
Critically Endangered ◽  
Endangered Fish ◽  
Habitat Improvement

Habitat attributes and chestnut-backed chickadee nest site selection in uncut and partial-cut forests

2007 ◽  
Vol 37 (7) ◽  
pp. 1272-1285 ◽  
Author(s):  
C. Lisa Mahon ◽  
Kathy Martin ◽  
J.D. Steventon
Keyword(s):  
Site Selection ◽  
Resource Selection ◽  
Nest Site ◽  
Spatial Scales ◽  
Nest Site Selection ◽  
Large Trees ◽  
Poecile Rufescens ◽  
The Relationship ◽  
Patch Scale ◽  
Selection Of

We examined the relationship between habitat attributes and nest-site selection by chestnut-backed chickadees ( Poecile rufescens (Townsend, 1837); hereinafter chickadees) in uncut and partial-cut forests in northwest British Columbia. We described the characteristics of uncut sites and compared them with structurally modified partial-cut sites (mature and old forests). We then compared the use and selection of habitat by chickadees at uncut and partial-cut sites at three spatial scales: (1) the stand (19–24 ha uncut or partial-cut stand), (2) the nest patch (a 0.031 ha patch centered on nest trees), and (3) the nest tree. At the stand scale, we found no correlation between the density of breeding chickadees and the characteristics of uncut and partial-cut sites. At the nest-patch scale, chickadees in uncut and old partial-cut sites selected nest patches with higher densities of broken-top trees compared with available habitat within territories. At the nest-tree scale, chickadees selected nest trees with boring insects and broken tops in uncut and mature partial-cut sites and large trees with boring insects in old partial-cut sites. Our results suggest that chickadees exhibited flexibility in resource selection but also selected resources with similar attributes at the nest-patch and nest-tree scales. Managed stands that maintain a range of tree species and conditions, including live trees with areas of disease, insect attack, and damage, will provide the specific structural attributes used for nesting by weak cavity excavators such as the chickadee.

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