Sex-based differences in spawning behavior account for male-biased harvest in Lake Erie walleye (Sander vitreus)

2019 ◽  
Vol 76 (11) ◽  
pp. 2003-2012 ◽  
Author(s):  
Andrew P. Bade ◽  
Thomas R. Binder ◽  
Matthew D. Faust ◽  
Christopher S. Vandergoot ◽  
Travis J. Hartman ◽  
...  
Keyword(s):  
Reproductive Behavior ◽  
Lake Erie ◽  
Spawning Season ◽  
Sander Vitreus ◽  
Spawning Behavior ◽  
Behavioral Differences ◽  
Sex Composition ◽  
Reproductive Behaviors ◽  
Reef Complex ◽  
Undue Risk

Sex- and size-specific reproductive behaviors can increase the vulnerability of certain demographic components of fish populations to exploitation, potentially leading to unsustainable harvest. Lake Erie’s largest walleye (Sander vitreus) spawning population, which aggregates on the Ohio reef complex during spring, is subject to angling. Information on the sex composition of harvest or how reproductive behavior might influence harvest is lacking. To address these uncertainties, we implanted 337 reef-spawning individuals with acoustic transmitters, and their spawning behavior on the reef complex was monitored for 4 years using acoustic telemetry. Males arrived on spawning grounds earlier and remained on them longer than females. These behavioral differences led us to predict that recreational angler harvest during the spawning season would be male-biased. Creel surveys confirmed this prediction, although sex composition of the harvest was influenced by angling technique. Collectively, these findings suggest that sex-based differences in reproductive behaviors bias the recreational harvest toward males on the reef complex during the spawning season. This male-biased harvest seems unlikely to pose an undue risk to Lake Erie’s walleye fishery.

The influence of larval growth rate on juvenile recruitment in Lake Erie walleye (Sander vitreus)

2020 ◽  
Vol 77 (3) ◽  
pp. 548-555
Author(s):  
Cassandra J. May ◽  
Stuart A. Ludsin ◽  
David C. Glover ◽  
Elizabeth A. Marschall
Keyword(s):  
Lake Erie ◽  
Larval Growth ◽  
Late Summer ◽  
Freshwater Fishes ◽  
Fast Growth ◽  
Sander Vitreus ◽  
Selective Mortality ◽  
Growth Selection ◽  
Poor Recruitment ◽  
The Relationship

Growth-selective mortality as larvae can influence recruitment in marine fishes. Its importance in freshwater fishes, however, remains speculative. We quantified growth trajectories within annual cohorts (2011–2013) of Lake Erie walleye (Sander vitreus) and their relationship with recruitment. We hypothesized that selection against slow or fast growth would be associated with high mortality and poor recruitment, whereas weak or nonexistent growth-selective mortality co-occurring with fast growth would be associated with good recruitment. We used otoliths to reconstruct growth rates during the first 15 days of life from larvae collected during spring and juvenile recruits (survivors) collected during late summer. We documented growth-selective mortality during 2011 and 2013, which exhibited poor recruitment as expected. During 2012, growth selection was absent, but growth was slow when compared to historical averages, resulting in poor recruitment. Growth was also considered slow in 2011 and 2013, due to multiple interacting conditions. Our study indicates that the relationship among larval growth, mortality, and future recruitment is complex, highlighting the need for continued research into how larval processes affect recruitment dynamics in freshwater fishes.

Does hypoxia reduce habitat quality for Lake Erie walleye (Sander vitreus)? A bioenergetics perspective

2011 ◽  
Vol 68 (5) ◽  
pp. 857-879 ◽  
Author(s):  
Stephen B. Brandt ◽  
Marco Costantini ◽  
Sarah Kolesar ◽  
Stuart A. Ludsin ◽  
Doran M. Mason ◽  
...  
Keyword(s):  
Habitat Quality ◽  
Lake Erie ◽  
Prey Availability ◽  
Spatial Arrangement ◽  
Spatially Explicit ◽  
Sander Vitreus ◽  
Light Conditions ◽  
The Impact ◽  
Favorable Temperature ◽  
East West

In Lake Erie, the duration and extent of hypoxia (dissolved oxygen (DO)  ≤ 2 mg·L–1) has increased in recent years, yet little is known on the corresponding impact on its fish, particularly the highly valued walleye ( Sander vitreus ) fishery. Here, we quantified the impact of hypoxia on walleye habitat quality, using a spatially explicit growth rate potential (GRP) modeling approach, which integrates the spatial arrangement of biological (prey availability) and environmental (DO, temperature, irradiance) measures. Data were collected along two types of transects: 60 km north–south transects (each sampled once during day and night) and 5 km east–west transects (sampled every 4 h for 24 h) during August (pre-hypoxia), September (peak-hypoxia), and October (post-hypoxia) 2005. Overall, the average monthly amount of high quality habitat (GRP > 0 g·g–1·day–1) for walleye declined slightly with hypoxia (<2.0%); however, hypoxia appeared to enhance habitat quality by concentrating prey in favorable temperature, DO, and light conditions. In September, percentages of walleye growth rates were at the upper end of the range, much more so than during August or October. Although an understanding of walleye distributions, foraging, and growth in relation to hypoxia is needed, our results do not suggest that hypoxia is negatively influencing walleye through reduced habitat quality.

Multiple captures of fulvous harvest mice (Reithrodontomys fulvescens) and northern pygmy mice (Baiomys taylori): evidence for short-term co-traveling

2012 ◽  
Vol 90 (3) ◽  
pp. 313-319
Author(s):  
N.S. Green ◽  
C.E. Early ◽  
L.K. Beard ◽  
K.T. Wilkins
Keyword(s):  
Sex Ratio ◽  
Small Mammals ◽  
Reproductive Behavior ◽  
Capture Probability ◽  
Pair Bonding ◽  
Sex Composition ◽  
Short Term ◽  
Trap Bias

Multiple captures of small mammals (finding >1 animal in a single trap) are often used to infer pair-bonding activity in arvicoline and cricetine rodents. We analyzed data from a 2-year trapping study to determine whether fulvous harvest mice ( Reithrodontomys fulvescens J.A. Allen, 1894) and (or) northern pygmy mice (Baiomys taylori (Thomas, 1887)) travel in mixed-sex mated pairs. A significant majority of multiple capture events (MCEs) in R. fulvescens were mixed-sex, whereas sex composition of pairs in B. taylori did not differ from random. Multiple capture probability was significantly positively related to abundance and unrelated to sex ratio in both species. Multiple captures of B. taylori were more common in winter, suggesting that individuals may associate to huddle for warmth. Masses of singly captured and multiply captured individuals were not significantly different in either species, contraindicating trap bias. Only one co-captured mixed-sex pair was recaptured as a pair (in R. fulvescens) and several animals of both sexes in both species were co-captured with multiple individuals. We concluded that R. fulvescens co-travels with mates for variable lengths of time, but we found no evidence that multiple captures of B. taylori are related to reproductive behavior.

scholarly journals Flowering, reproductive behaviors and their effects on grain yields of newly bred single cross hybrids of yellow maize (Zea mays L.) in winter in subtropical Nepalese Himalayan foot plain

2015 ◽  
Author(s):  
Nav Raj Adhikari ◽  
Surya Kant Ghimire ◽  
Shrawan Kumar Sah ◽  
Keshab Babu Koirala
Keyword(s):  
Reproductive Behavior ◽  
Plant Population ◽  
Reproductive Behaviors ◽  
Stressful Environment ◽  
Maize Population ◽  
Single Cross ◽  
Apical Node ◽  
Male Organ ◽  
Kernel Set ◽  
Single Cross Hybrids

Introduction: All the plants of a maize population or hybrid PP (plant population) do not dehisce anthers and do not emerge silk simultaneously. Generally, male flowering or anther dehiscence (anthesis) is leading and female flowering (silk emergence or silking) is lagging under both conducive and stressful environment. Enough and timely pollen availability is indispensible when silks come out of maize ears for largest number of kernel set. So, study of flowering and reproductive behavior of newly bred maize hybrids are indispensible to confirm high grain yielding hybrid with trait of simultaneous anthesis and silking (synchrony). Materials and methods: Flowering and reproductive behaviors of fifteen newly bred single cross hybrids of yellow maize have been examined in winter growing them in an RCBD trial planting their seeds on October 3, 2012 in subtropical foot plain of Himalaya. For flowering (FB); emergence of male organ (emergence of tassel or tasseling or TSS) from apical node of the stem, anthesis, silking, browning of silk or withering of silk (silk senescence or S SEN), tassel-anthesis interval (TAI), anthesis-silking interval (ASI), silking-silk senescence interval (S INI-S SEN Interval) of the hybrids have been examined dissecting the plant population (PP) into four equal parts (percent) as the first earliest, second earliest, third earliest and terminal 25% of the PP denominated as 25, 50, 75 and 100% respectively of the each of the fifteen hybrids. So, whether third earliest 25% and terminal 25% silk emerging PP denominated as SILK 75 and SILK 100% respectively will get enough pollen from the PP of the same hybrid can be determined through ASI 75 and ASI 100 of the hybrid PP. Results and discussion: A polynomial grain yield estimating regression equation (t ha-1) Y = - 11922 + 507.3*(TSS25) - 7.183*(TSS25)2 + 0.03387*(TSS25)3 with r2 value 66% has been discovered from days taken for TSS25 (TSS of earliest 25% PP). Similarly, high r2 bearing polynomial equations were from days for anthesis and silking of the PPs of the fifteen hybrids. Equations with the lowest r2 were for the days required for the silk senescence (S SEN). Reason of low r2 is that the observation of silk browning or withering could not be precise for naked eye since the silks looked fresh longer in high humidity, low temperature and cloudy day in the winter although it lost receptivity earlier. In addition, Interval duration from S INI to S SEN cannot be the duration of silk receptivity in the winter of subtropical Nepalese Himalayan foot plain. For reproductive behavior; number of functional egg cells that became successful zygotes to pull assimilates for complete kernel development can reflect aroma about reproductive strength (RS) of the hybrid. Accordingly, hybrids 8 and 5 have been found of the highest RS.

scholarly journals Flowering, reproductive behaviors and their effects on grain yields of newly bred single cross hybrids of yellow maize (Zea mays L.) in winter in subtropical Nepalese Himalayan foot plain

2015 ◽  
Author(s):  
Nav Raj Adhikari ◽  
Surya Kant Ghimire ◽  
Shrawan Kumar Sah ◽  
Keshab Babu Koirala
Keyword(s):  
Coming Out ◽  
Reproductive Behavior ◽  
Polynomial Regression ◽  
Regression Equations ◽  
Reproductive Behaviors ◽  
Stressful Environment ◽  
Maize Population ◽  
Single Cross ◽  
Kernel Set ◽  
Single Cross Hybrids

Introduction: All the plants of a maize population or hybrid PP (plant population) do not dehisce anthers and do not emerge silk simultaneously. Generally, male flowering or anther dehiscence (anthesis) is leading and female flowering (silk emergence or silking) is lagging under both optimum and stressful environment. Enough and timely pollen availability is indispensable when silks come out of maize ears for largest number of kernel set. So; study of flowering and reproductive behavior of newly bred maize hybrids are indispensable to confirm high grain yielding hybrid with traits of synchrony in anthesis and silking, coming out of all silks and enough pollen availability in short duration. Materials and methods: Flowering and reproductive behaviors of fifteen newly bred single cross hybrids of yellow maize have been examined growing them in an RCBD trial planting their seeds on October 3, 2012 to expose flowering to the natural winter in subtropical foot plain of Himalaya. For flowering behavior; emergence of tassel, anthesis, silking, silk senescence, tassel-anthesis interval, anthesis-silking interval, silking-silk senescence interval of the hybrids have been examined dissecting the PP into four equal parts (percent) as the first earliest, second earliest, third earliest and terminal 25% of the hybrid PP denominated as 25, 50, 75 and 100% respectively of the each of the fifteen hybrids. So, whether third earliest 25% and terminal 25% silk emerging PP of each of the hybrids (SILK75 and SILK100%) respectively received enough pollen from the PP of the same hybrid can be determined through ASI 75 and ASI 100 of the hybrid PP. Results and discussion: Among some polynomial regression equations (PREs) discovered based on floral traits, a grain yield estimating PRE (t ha-1) Y = - 11922 + 507.3*(TSS25)1 - 7.183*(TSS25)2 + 0.03387*(TSS25)3 with r2 value 66% has been discovered from days taken for TSS25. Similarly, high r2 bearing PREs were from days for anthesis and silking. PREs with the lowest r2 were for the days required for the silk senescence (S SEN). Reasons of the low r2 are: the observation of silk browning or withering could not be precise for naked eye since the silks looked fresh longer in high humidity, well-irrigated state, low temperature, low sun-shine and foggy or cloudy day although the silks lost receptivity earlier in the winter. In addition, interval duration from SILK INI to S SEN cannot be the duration of silk receptivity in the winter of subtropical Nepalese Himalayan foot plain. For reproductive behavior; number of functional egg cells that became successful zygotes to pull assimilates for complete kernel development can reflect aroma about reproductive strength (RS) of the hybrid. Accordingly, hybrids 8 and 5 have been found of the highest RS.

scholarly journals Compensatory responses by managers, commercial and recreational harvesters to variation in stock abundance of Lake Erie walleye (Sander vitreus vitreus)

2016 ◽  
Author(s):  
Katrine Turgeon ◽  
Kevin B. Reid ◽  
John M. Fryxell ◽  
Thomas D. Nudds
Keyword(s):  
Lake Erie ◽  
Fishing Effort ◽  
Assessment Process ◽  
Risk Governance ◽  
Sander Vitreus ◽  
Commercial Harvest ◽  
Stock Assessments ◽  
Governance Processes ◽  
Fishery Collapse ◽  
Stock Abundance

AbstractDelayed quota adjustments, and/or lagged fishing effort and catch by harvesters, to changes in stock abundance may induce unstable population dynamics and exacerbate the risk of fishery collapse. We examined a 39-y time series of change to quotas by managers, and to effort and catch by both commercial harvesters and anglers, in response to changes in Lake Erie walleye abundance (Sander vitreus) estimated both contemporaneously and retrospectively. Quotas, commercial effort and catch were entrained by contemporaneous estimates of stock abundance. Recreational effort and harvest were not; they had better tracked abundance, as better estimated today, than did the commercial fishery. During the 1990s, a significant mismatch developed between the quota-driven commercial harvest and stock abundance that persisted until a new assessment process obtained. The quasi-open access recreational fishery, instead, freed anglers to respond better to stock abundance. Further elaboration of adaptive risk governance processes, including multi-model inference for stock assessments, may bode well to further reduce risk to fisheries imposed by lagged adjustments to variation in stock abundance.

Stock-specific advection of larval walleye (Sander vitreus) in western Lake Erie: Implications for larval growth, mixing, and stock discrimination

2015 ◽  
Vol 41 (3) ◽  
pp. 830-845 ◽  
Author(s):  
Michael E. Fraker ◽  
Eric J. Anderson ◽  
Cassandra J. May ◽  
Kuan-Yu Chen ◽  
Jeremiah J. Davis ◽  
...  
Keyword(s):  
Lake Erie ◽  
Larval Growth ◽  
Sander Vitreus ◽  
Stock Discrimination ◽  
Western Lake ◽  
Western Lake Erie

Suitable habitat model for walleye (Sander vitreus) in Lake Erie: Implications for inter-jurisdictional harvest quota allocations

2013 ◽  
Vol 39 (4) ◽  
pp. 591-601 ◽  
Author(s):  
Shubha N. Pandit ◽  
Yingming Zhao ◽  
Jan J.H. Ciborowski ◽  
Ann Marie Gorman ◽  
Carey T. Knight
Keyword(s):  
Lake Erie ◽  
Habitat Model ◽  
Suitable Habitat ◽  
Sander Vitreus

Reproductive biology of the commercial sea cucumber Parastichopus californicus (Stimpson) (Echinodermata: Holothuroidea). I. Reproductive periodicity and spawning behavior

1986 ◽  
Vol 64 (1) ◽  
pp. 168-175 ◽  
Author(s):  
J. Lane Cameron ◽  
Peter V. Fankboner
Keyword(s):  
British Columbia ◽  
Reproductive Biology ◽  
Reproductive Cycle ◽  
Sea Cucumber ◽  
Late Spring ◽  
Spawning Season ◽  
Inland Waters ◽  
Spawning Behavior ◽  
Annual Reproductive Cycle

The commercial sea cucumber Parastichopus californicus (Stimpson) has an annual reproductive cycle, with spawning occurring in the late spring through summer within the inland waters of southwestern British Columbia, Canada. The sexes are separate and occur at a 1:1 ratio within the population studied. Ovarian and testicular tubules regenerate and proliferate preceding the spawning season each year. Spawning is partially synchronous and may be mediated by an increase in the intensity and duration of insolation.

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