Browsing by Subject "invertebrates"
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Item The Effect Of Travel Loss On Evolutionarily Stable Distributions Of Populations In Space(2011-07) DeAngelis, Donald L.; Wolkowicz, Gail S. K.; Lou, Yuan; Jiang, Yuexin X.; Novak, Mark; Svanback, Richard; Araujo, Márcio S.; Jo, YoungSeung; Cleary, Erin A.; Jiang, Yuexin X.A key assumption of the ideal free distribution (IFD) is that there are no costs in moving between habitat patches. However, because many populations exhibit more or less continuous population movement between patches and traveling cost is a frequent factor, it is important to determine the effects of costs on expected population movement patterns and spatial distributions. We consider a food chain (tritrophic or bitrophic) in which one species moves between patches, with energy cost or mortality risk in movement. In the two-patch case, assuming forced movement in one direction, an evolutionarily stable strategy requires bidirectional movement, even if costs during movement are high. In the N-patch case, assuming that at least one patch is linked bidirectionally to all other patches, optimal movement rates can lead to source-sink dynamics where patches with negative growth rates are maintained by other patches with positive growth rates. As well, dispersal between patches is not balanced (even in the two-patch case), leading to a deviation from the IFD. Our results indicate that cost-associated forced movement can have important consequences for spatial metapopulation dynamics. Relevance to marine reserve design and the study of stream communities subject to drift is discussed.Item Letter to Eugene Coan from H.B. Stenzel on 1966-10-13(1966-10-13) Stenzel, Henryk B.Item Letter to H.B. Stenzel from H.J. Sawin on 1962-06-09(1962-06-09) Sawin, H.J.Item Letter to H.B. Stenzel from Jean Roger on 1970-09-18(1970-09-18) Roger, JeanItem Letter to H.B. Stenzel from Llewellyn Ivor Price on 1952-07-05(1952-07-05) Price, Llewellyn IvorItem Letter to H.B. Stenzel from Lois Chambers Taylor on 1946-09-12(1946-09-12) Taylor, Lois ChambersItem Letter to Jean-Pierre Lehman from H.B. Stenzel on 1962-10-22(1962-10-22) Stenzel, H.B.Item Letter to Katherine Van Winkle Palmer from H.B. Stenzel on 1943-01-06(1943-01-06) Stenzel, H.B.Item Letter to Lloyd W. Stephenson from H.B. Stenzel on 1935-09-18(1935-09-18) Stenzel, Henryk B.Item Letter to R.S. Lull from H.B. Stenzel on 1943-10-28(1943-10-28) Stenzel, H.B.Item Letter to Tamio Kotaka from H.B. Stenzel on 1961-01-19(1961-01-19) Stenzel, H.B.Item A Provisional List of Systematic Literature on Marine and Brackish Water Invertebrates of the Western Gulf of Mexico(Texas A&M Research Foundation, 1948-02-11) Hedgpeth, Joel W.Item Status of Biotic Integrity, Water Quality, and Physical Habitat in East Texas Wadeable Streams(TPWD, 2004-02) Kleinsasser, L.J.; and 13 othersItem Submerged Lands of Texas, Brownsville-Harlingen Area: Sediments, Geochemistry, Benthic Macroinvertebrates..(1984) White, William Allen, 1939-; Calnan, Thomas R.; Morton, Robert A.Surface sediment textures, sediment geochemistry, and benthic fauna of the State-owned submerged lands were mapped and described using bottom samples collected at 1-mi (1.6-km) intervals from bays, estuaries, and lagoons, and the inner continental shelf. In one area of Laguna Madre samples were collected at 0.5-mi (0.8-km) intervals. In addition, the distribution of wetlands in adjacent areas was mapped using color infrared photographs taken primarily in 1979. Textural maps of the Brownsville-Harlingen area show that sand and muddy sand, having a mean grain size of between 2.5 and 5, are the dominant sediment types in bay-estuary-lagoon and inner-shelf areas. Generally, in Laguna Madre sands occur on the barrier island side of the lagoon, whereas muddier sediments are more abundant along the mainland side and in deeper areas. Muddy sand is dominant in the relatively wide southern end of Laguna Madre, and sand is dominant along the narrower, northern two-thirds of the lagoon where broad sandy wind-tidal flats on Padre Island grade into shallow subaqueous lagoon sands. Dominantly sand-sized sediments blanket most of the inner shelf and extend about 10 mi (16 km) offshore from Padre Island. The greatest extent of sand is associated with marine reworked late Pleistocene fluvial-deltaic deposits that underlie much of the inner shelf. Water depths average about 90 ft (30 m) at the outer limits of this sand-rich area. A nearshore patch of mud occurs near the mouth of the Rio Grande and represents the most recent deposition of the river. To the east and north the mud grades into muddy sand that represents a mixture of relict shelf sands and more modern fluvial muds.