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Larval and Spawning Ecology of the Blue Crab, Callinectes sapidus, in the Northern Gulf of Mexico
Başlık:
Larval and Spawning Ecology of the Blue Crab, Callinectes sapidus, in the Northern Gulf of Mexico
Yazar:
Giltz, Sarah M., author.
ISBN:
9780438073449
Yazar Ek Girişi:
Fiziksel Tanımlama:
1 electronic resource (110 pages)
Genel Not:
Source: Dissertation Abstracts International, Volume: 79-10(E), Section: B.
Advisors: Caz Taylor.
Özet:
Details of the spawning and larval ecology of marine invertebrates are often unknown or poorly understood. The northern Gulf of Mexico (nGOM) supports fishing, tourism, oil industry, and coastal populations but is understudied. The Deepwater Horizon oil spill put a spotlight on the region, highlighting research gaps. This dissertation is intended to fill gaps in our knowledge through focusing on one commercially important species: the blue crab, Callinectes sapidus. To estimate spawning locations, I model movement of larvae in reverse to four known settlement sites. Most larvae were spawned within the same state's waters from 57% in Florida to 100% in Louisiana. High settlement numbers occurred with larvae from more distant sites. The variation in distance traveled by larvae explained some of the variation in settlement numbers seen in previous empirical studies. In 2010 and 2011 I surveyed the surface zooplankton off the Louisiana coast to identify possible changes to the community composition, biomass, or abundance. The largest changes occurred in the region closest to the spill and the Mississippi River, with an increase in diversity, richness, biomass, abundance, and larval crab abundance from 2010 to 2011. The oil spill occurred closest to our easternmost sampling region, as did the increased discharge of the Mississippi River, confounding the reason for the changes. I experimentally observed the survival and development of larval and juvenile blue crabs when exposed to crude oil and in lowered pH, representing anticipated future conditions of increasing ocean acidification. Larvae were resilient to oil exposure, showing no difference in size or mortality. Juvenile crabs showed increased time between molts, indicating physiological stress. Conversely larval crabs were smaller in a lower pH environment while juveniles showed no discernable differences. Larval crabs also exhibited a greater tendency toward group die-offs at a lower pH. This dissertation contributes to knowledge of invertebrate spawning and larval ecology and zooplankton community composition in the nGOM. We are better equipped to manage the blue crab fishery and protect the species in a changing world with more knowledge of the sources of planktonic larvae, the zooplankton community, and the effects of anthropogenic stressors.
Notlar:
School code: 0494
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Yer Numarası | Demirbaş Numarası | Shelf Location | Lokasyon / Statüsü / İade Tarihi |
---|---|---|---|
XX(677981.1) | 677981-1001 | Proquest E-Tez Koleksiyonu | Arıyor... |
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