عنوان

Cold-Water Prey Fish Monitoring and Ecology in Lake Oahe

شماره

TLpq2408554373

زبان متن نوشتاري يا گفتاري و مانند آن

انگلیسی

عنوان اصلي

Cold-Water Prey Fish Monitoring and Ecology in Lake Oahe

نام عام مواد

[Thesis]

نام نخستين پديدآور

Kludt, Nicholas B.

نام ساير پديدآوران

Graeb, Brian D.S.;Fincel, Mark J.

نام ناشر، پخش کننده و غيره

South Dakota State University

تاریخ نشرو بخش و غیره

2020

نام خاص و کميت اثر

197

جزئيات پايان نامه و نوع درجه آن

Ph.D.

کسي که مدرک را اعطا کرده

South Dakota State University

امتياز متن

2020

متن يادداشت

In Lake Oahe, a large mainstem Missouri river reservoir that spans 375 river kilometers in central North and South Dakota, naturalized Rainbow Smelt are the primary forage species for a regionally important Walleye Sander vitreus fishery. Walleye condition in Lake Oahe is highly correlated to Rainbow Smelt relative abundance through time, the latter species being typified by erratic abundance trends since accidental introduction in 1971. Cisco Coregonus artedii were introduced in the early 1990s to augment the cold-water prey base. We evaluated Lake Oahe cold-water prey base monitoring and dynamics through: 1.) a comparison of two hydroacoustic survey designs, 2.) an evaluation of survey timing and effort for the cold-water prey base, 3.) an evaluation of Rainbow Smelt spawning ecology, 4.) an evaluation of Rainbow Smelt larval life history, and 5.) an analysis of Rainbow Smelt and Cisco recruitment dynamics with extensions to Lake Oahe Walleye. We demonstrated that an abbreviated survey technique using short, longitudinally oriented transects generated comparable data to the more time-intensive historic monitoring plan. We also documented relatively consistent estimates regardless of survey timing. The number of transects required to achieve an acceptable degree of accuracy reflected current practices. Rainbow Smelt spawning was strongly related to water temperature, consistent with observations elsewhere in their range. Steeply sloping and deeper habitats were associated with greater spawning abundance, becoming more pronounced as spring warming proceeded. We also documented faster larval Rainbow Smelt growth at these sites, despite cooler water temperatures. Rainbow Smelt recruitment was related to heating degree days, indicating stronger year class production in earlier springs. Recruitment was also related to lower reservoir elevations, perhaps linked to greater availability of preferred adult spawning habitat. Greater Cisco recruitment was observed following Rainbow Smelt population collapses, consistent with other systems with concurrent populations. Walleye condition, historically responsive to Rainbow Smelt abundances, may have recently decoupled with the availability of alternative prey. Although beneficial to the management of Lake Oahe, the work presented here contributes to the general understanding of Rainbow Smelt and Cisco interactions and recruitment, and offers a simplified methodology for the monitoring and estimation of cold-water prey abundances.

موضوع مستند نشده

Cisco

موضوع مستند نشده

Hydroacoustics

موضوع مستند نشده

Monitoring

موضوع مستند نشده

Rainbow smelt

موضوع مستند نشده

Reservoir ecology

موضوع مستند نشده

Walleye

مستند نام اشخاص تاييد نشده

Graeb, Brian D.S.

مستند نام اشخاص تاييد نشده

Kludt, Nicholas B.

مستند نام اشخاص تاييد نشده

Fincel, Mark J.

نام الکترونيکي

فرمت انتشار

p

نوع ماده

[Thesis]

کد کاربرگه

276903

سطح دسترسي

a

تكميل شده

Y