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Influence of Pit Tags on Growth and Survival of Banded Sculpin (Cottus carolinae): Implications for Endangered Grotto Sculpin (Cottus specus)
Başlık:
Influence of Pit Tags on Growth and Survival of Banded Sculpin (Cottus carolinae): Implications for Endangered Grotto Sculpin (Cottus specus)
Yazar:
Fernholz, Jacob, author.
ISBN:
9780438000704
Yazar Ek Girişi:
Fiziksel Tanımlama:
1 electronic resource (51 pages)
Genel Not:
Source: Masters Abstracts International, Volume: 57-06M(E).
Advisors: John S. Scheibe; James E. Champine Committee members: Timothy M. Judd; John C. Kraemer; Charles McAllister; Quinton Phelps.
Özet:
Chapter A-To make appropriate restoration decisions, fisheries scientists must be knowledgeable about life history, population dynamics, and ecological role of a species of interest. However, acquisition of such information is considerably more challenging for species with low abundance and that occupy difficult to sample habitats. One such species that inhabits areas that are difficult to sample is the recently listed endangered, cave-dwelling grotto sculpin, Cottus specus. To understand more about the grotto sculpin's ecological function and quantify its population demographics, a mark-recapture study is warranted. However, the effects of PIT tagging on grotto sculpin are unknown, so a passive integrated transponder (PIT) tagging study was performed. Banded sculpin, Cottus carolinae, were used as a surrogate for grotto sculpin due to genetic and morphological similarities. Banded sculpin were implanted with 8.3 3 1.4 mm and 12.0 3 2.15 mm PIT tags to determine tag retention rates, growth, and mortality. Our results suggest sculpin species of the genus Cottus implanted with 8.3 3 1.4 mm tags exhibited higher growth, survival, and tag retention rates than those implanted with 12.0 3 2.15 mm tags. To this end, we recommend 8.3 3 1.4 mm PIT tags as a feasible option for tagging adult sculpin (. 60 mm total length) with minimal impacts on growth and mortality.
Chapter B-Sensitive species with isolated ranges are strongly influenced by human perturbations that may result in extinction. These sensitive species are often placed on the endangered species list, commonly because of anthropogenic disturbance. One such endangered species that is affected by human perturbations such as sedimentation and pollution, is the Grotto Sculpin (Cottus specus). The Grotto Sculpin has an isolated range and only occurs in two karst systems within Perry County, Missouri. In order to gain insight into the habitat requirements of the Grotto Sculpin, a habitat selectivity study was conducted. We completed a habitat assessment in three cave systems that support Grotto Sculpin populations. This data was collected within Tom Moore, Mystery, and Running Bull Caves to determine available depth, substrate, velocity and macrohabitat (i.e., riffle, run, pool). This habitat assessment was used in conjunction with a visual assessment of the spatial distribution of individuals to determine habitat selectivity of Grotto Sculpin among life stage groups. Our data collection and predictive modeling results suggest Grotto Sculpin select for pools featuring slow velocity and cobble substrate, in comparison to other available habitats. Smaller size classes utilized a wider variety of habitats, which could be attributed to direct intraspecific competition. The most selected for substrate type, macrohabitat type, and velocity type available for Grotto Sculpin are not the most prevalent in any of the caves sampled; therefore, habitat could be the reason for potential intraspecific competition. In order to protect Grotto Sculpin, we recommend implementing conservation efforts aimed at conserving pools, cobble substrates and low velocity areas. Such conservation efforts could include minimizing sedimentation and siltation within caves and mitigating potential pollution effects by planting buffer strips around sink hole and cave locations.
Notlar:
School code: 1176
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Yer Numarası | Demirbaş Numarası | Shelf Location | Lokasyon / Statüsü / İade Tarihi |
---|---|---|---|
XX(690514.1) | 690514-1001 | Proquest E-Tez Koleksiyonu | Arıyor... |
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