Download PDF by Tadashi Kawai, Neil Cumberlidge: A Global Overview of the Conservation of Freshwater Decapod

By Tadashi Kawai, Neil Cumberlidge

ISBN-10: 3319425250

ISBN-13: 9783319425252

ISBN-10: 3319425277

ISBN-13: 9783319425276

This e-book introduces up to date info on conservation matters, offering an summary of what's had to strengthen the worldwide conservation of freshwater decapods equivalent to freshwater crabs, crayfish, and shrimps.

Biodiversity loss generally is optimum in organisms that rely on intact freshwater habitats, simply because freshwater ecosystems world wide are soreness excessive threats from a number of assets. Our figuring out of the quantity and placement of threatened species of decapods, and of the character in their extinction threats has more desirable tremendously lately, and has enabled the advance of species conservation suggestions.

This quantity specializes in saving threatened species from extinction, and emphasizes the significance of the profitable implementation of conservation motion plans via cooperation among scientists, conservationists, educators, investment businesses, coverage makers, and conservation agencies.

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A few species (Aegla microphthalma Bond-Buckup and Buckup 1994, A. cavernicola Türkay 1972 and A. leptochela Bond-Buckup and Buckup 1994) are obligate cave dwellers or troglobites (Fig. 4b). Troglobitic species exhibit troglomorphic traits, such as depigmentation of the cuticle (Fig. 3i), shorter eyestalks, a reduced pigmented area of the cornea (Fig. 5), proportionately longer walking legs (Fig. 3d), and longer antennal flagella (Bond-Buckup and Buckup 1994; Moracchioli 1994; Alves 2007). Troglobitic species are highly endemic, with distributions restricted to the type-locality inside the cave (Türkay 1972; Trajano 1987; Bond-Buckup and Buckup 1994; Gnaspini and Trajano 1994; Moracchioli 1994, Maia et al.

Soon after the introduction of P. clarkii to the lake their populations rose to levels high enough to support a thriving commercial export fishery. However, the high densities of crayfish in the lake had a devastating impact on the aquatic vegetation due to overgrazing and there was a subsequent collapse of crayfish populations. The eventual recovery of the lake’s aquatic plants allowed crayfish populations to expand and once again they overgrazed the lake’s vegetation. The dominance of P. clarkii in Kenyan freshwater ecosystems and its cyclical effects on the lake’s primary producers also caused population crashes of native freshwater crabs (Potamonautes loveni) (Gherardi et al.

A Aegla schmitti, sexual dimorphism of the pair of chelipeds between male (left) and female (right). Sexual dimorphism regarding the size of pleonal somites 2, 3 and 4 can also be noted. Bar 1 cm. 7 mm) sampled in November 2005 and February 2006, respectively. CL: carapace length taken from right orbital sinus to posterior midpoint border of carapace. Bar 1 cm documented in freshwater aeglids (Bahamonde and López 1961; López 1965; Colpo et al. 2005; Viau et al. 2006; Bueno and Shimizu 2009). The increase in claw dimensions in adult male decapods is often associated with agonistic and/or reproductive behaviour (Mariappan et al.

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A Global Overview of the Conservation of Freshwater Decapod Crustaceans by Tadashi Kawai, Neil Cumberlidge

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