Role of vegetation in the life cycle of pike

Bry, C.

doi:10.1007/978-94-015-8775-4_3

Cited by 63 publications

(58 citation statements)

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“…They were used on an individual basis (one free embryo per tube) for the following reasons: (1) this procedure allowed to establish individual temporal patterns of body orientation and of position along the vertical axis; and (2) the trajectory of a given free embryo could not be influenced by displacements of other free embryos, as would have been the case in a multi-individual approach. The depth of 25 cm was selected as representative of the shallow waters (5-60 cm) where most pike spawning activity takes place (Raat, 1988;Bry, 1996). One day before the expected start of hatching, 25 embryos from a given brood were transferred to 25 tubes.…”

Section: > Experimental Systemmentioning

confidence: 99%

“…Using a glass pipette (inner diameter: 5.5 mm), each embryo was gently deposited on a weighted and slightly curved mesh support (15 × 15 mm; 1-mm mesh) suspended in the tube at 5 cm above bottom. This procedure was followed in order to mimic the fact that immediately after fertilization pike eggs generally stick to the vegetation at some level in the water column, until hatching (Raat, 1988;Bry, 1996). Once a given free embryo had left the hatching site to cling to the tube wall, the corresponding mesh support was removed carefully.…”

Section: > Experimental Systemmentioning

confidence: 99%

“…A depth of 60 cm is considered as close to the upper depth limit of typical egg deposition in flooded areas and in small spawning ponds (Bry, 1996;Casselman and Lewis, 1996), although pike eggs may also be deposited in deeper littoral habitats (up to 6 m) at the end of a protracted spawning season (Farrell et al, 2006). From each brood, 25 embryos were assigned to individual 60-cm columns, and 10 to the determination of start feeding.…”

Section: > Free Embryo Observationsmentioning

confidence: 99%

“…On the subject of spatial distribution, it has been unanimously noted that newly hatched pike typically move upward in the water column and attach themselves vertically to plant stems or leaves, or to decaying vegetation. Clearly, the presence of macrophytes is of utmost importance during this particular step of pike ontogeny (Bry, 1996;Craig, 2008) and emergent vegetative associations generally are a key component of nursery habitats (Casselman and Lewis, 1996). Attachment is made possible by the presence of cement secreting glands, a transient embryonic specialization.…”

Section: Introductionmentioning

confidence: 99%

“…We hypothesized that free moving young fishes, albeit embryos, would display a notable inter-individual variability in spatial position, body orientation and mobility during at least some periods of their development. Since pike free embryos readily adhere to glass or plastic walls when in captivity (Bry, 1996), artificial water columns dedicated to monitoring pike individuals were used under controlled environmental conditions.…”

Section: Introductionmentioning

confidence: 99%

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Temporal changes in vertical distribution, body orientation and mobility of pike (Esox luciusL.) free embryos: Individual observations under controlled conditions

Bry

Davigny

2010

Knowl. Managt. Aquatic Ecosyst.

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Key-words:Esox lucius free embryos, 0+ pike, vertical distribution, attachment behaviour, eleutheroembryo mobilityThe vertical distribution, body orientation and mobility of pike free embryos were studied at 10• C in 25-cm individual water columns. Five steps were identified: (1) a resting phase, up to day (D) 4 post-hatching; (2) an ascent phase (D1-D4); (3) a plateau (D5-D8), characterized by a wall-attachment behaviour in the subsurface zone; (4) a break-off phase (D9-D13); and (5) a final localization between mid-water and surface, corresponding to the air filling of the swim bladder and to the transition to active, horizontal swimming (D14-D17). Free embryos could be: side-lying (phase 1, late phase 4 and phase 5); lying upright (phases 4 and 5); vertically suspended with adhesion to the wall (phases 2-3 and early phase 4); and in oblique or horizontal position (phase 5). The opening of mouth and anus occurred during phases 2 and 3 and swim bladder filling started on days 13-14. Free embryo mobility was low and stable during the first 5 days and increased regularly thereafter to reach maximal levels on days 14-16. This research provides evidence for a more complex and more variable temporal pattern of free embryo vertical distribution, posture and mobility than previously thought. au cours des phases 2 et 3 et le remplissage de la vessie natatoire a débuté à J13 ou J14. Le degré de mobilité de l'embryon libre, peu élevé et stable au cours des 5 premiers jours, a ensuite augmenté de façon régulière pour atteindre les valeurs les plus élevées entre J14 et J16. La présente étude met en évidence pour la répartition spatiale, la posture et la mobilité de l'embryon libre l'existence d'une séquence temporelle plus complexe et plus variable que ne le suggéraient les connaissances antérieures.

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Section: > Experimental Systemmentioning

confidence: 99%

Section: > Experimental Systemmentioning

confidence: 99%

Section: > Free Embryo Observationsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Temporal changes in vertical distribution, body orientation and mobility of pike (Esox luciusL.) free embryos: Individual observations under controlled conditions

Bry

Davigny

2010

Knowl. Managt. Aquatic Ecosyst.

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Prey selection by larval northern pike (Esox lucius) exposed to different zooplankton assemblages representing seasonally flooded wetland and nearshore bay habitats

Massa

Farrell

2018

Limnology & Oceanography

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A prey selection experiment was designed to investigate whether northern pike larvae, at swim-up and advanced stages, select similar zooplankton prey in seasonally flooded wetlands and nearshore littoral zones, which represent primary St. Lawrence River northern pike spawning habitats. At first exogenous feeding, naïve swim-up larvae exposed to both wetland and nearshore zooplankton were generalist consumers, feeding primarily on cyclopoid copepods and small cladocerans. No positive selection was observed for any prey taxa. Advanced larvae began to exhibit positive selection for large cladocerans. Significantly larger-sized prey were consumed by advanced larvae given wetland vs. nearshore zooplankton. Large cladocerans made up a greater proportion of the assemblage originating from seasonally flooded wetlands vs. nearshore habitats, and may explain the difference in size selectivity. Our laboratory experiment suggests pike hatched in wetland environments have greater access to preferred, large cladoceran prey, and differences in spatial and temporal spawning distributions may have important implications for zooplankton availability and hence food consumption during the critical larval period.

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Combining environmental DNA with remote sensing variables to map fish species distributions along a large river

Zong,

Brantschen,

Zhang

et al. 2023

Remote Sens Ecol Conserv

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Biodiversity loss in river ecosystems is much faster and more severe than in terrestrial systems, and spatial conservation and restoration plans are needed to halt this erosion. Reliable and highly resolved data on the state of and change in biodiversity and species distributions are critical for effective measures. However, high‐resolution maps of fish distribution remain limited for large riverine systems. Coupling data from global satellite sensors with broad‐scale environmental DNA (eDNA) and machine learning could enable rapid and precise mapping of the distribution of river organisms. Here, we investigated the potential for combining these methods using a fish eDNA dataset from 110 sites sampled along the full length of the Rhone River in Switzerland and France. Using Sentinel 2 and Landsat 8 images, we generated a set of ecological variables describing both the aquatic and the terrestrial habitats surrounding the river corridor. We combined these variables with eDNA‐based presence and absence data on 29 fish species and used three machine‐learning models to assess environmental suitability for these species. Most models showed good performance, indicating that ecological variables derived from remote sensing can approximate the ecological determinants of fish species distributions, but water‐derived variables had stronger associations than the terrestrial variables surrounding the river. The species range mapping indicated a significant transition in the species occupancy along the Rhone, from its source in the Swiss Alps to outlet into the Mediterranean Sea in southern France. Our study demonstrates the feasibility of combining remote sensing and eDNA to map species distributions in a large river. This method can be expanded to any large river to support conservation schemes.

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Role of vegetation in the life cycle of pike

Cited by 63 publications

References 0 publications

Temporal changes in vertical distribution, body orientation and mobility of pike (Esox luciusL.) free embryos: Individual observations under controlled conditions

Temporal changes in vertical distribution, body orientation and mobility of pike (Esox luciusL.) free embryos: Individual observations under controlled conditions

Prey selection by larval northern pike (Esox lucius) exposed to different zooplankton assemblages representing seasonally flooded wetland and nearshore bay habitats

Combining environmental DNA with remote sensing variables to map fish species distributions along a large river

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