phylogenetic relationships among the true porpoises (cetacea:phocoenidae).portions of the cytochrome b gene and control region of the mitochondrial dna molecule were sequenced to investigate systematic relationships among the six extant species of true porpoises, (cetacea: phocoenidae). phylogenetic analyses of mitochondrial cytochrome b sequences support a close relationship between burmeister's porpoise, phocoena spinipinnis, and the vaquita, phocoena sinus, and the association of these two species with the spectacled porpoise, australophocaena dioptrica. the latter ...19958747302
genetic drift vs. natural selection in a long-term small isolated population: major histocompatibility complex class ii variation in the gulf of california endemic porpoise (phocoena sinus).although many studies confirm long-term small isolated populations (e.g. island endemics) commonly sustain low neutral genetic variation as a result of genetic drift, it is less clear how selection on adaptive or detrimental genes interplay with random forces. we investigated sequence variation at two major histocompatibility complex (mhc) class ii loci on a porpoise endemic to the upper gulf of california, méxico (phocoena sinus, or vaquita). its unique declining population is estimated around ...200717727623
functional variants of the melanocortin-4 receptor associated with the odontoceti and mysticeti suborders of cetaceans.cetaceans, a group of mammals adapted to the aquatic environment that descended from terrestrial artiodactyls, exhibit tremendous interspecific differences in a number of phenotypes, including feeding behavior, such as filter feeding in the mysticeti vs prey-hunting odontoceti, and size, with the smallest cetacean, the vaquita, at 1.4 meters and the largest, the blue whale, reaching 33 meters. the melanocortin-4 receptor (mc4r) regulates food intake, energy balance, and somatic growth in both ma ...201728720755
morphology and variation in porpoise (cetacea: phocoenidae) cranial endocasts.evolution of endocranial anatomy in cetaceans is important from the perspective of echolocation ability, intelligence, social structure, and alternate pathways for circulation to the brain. apart from the importance of studying brain shape and asymmetries as they relate to aspects of behavior and intelligence, cranial endocasts can show a close correspondence to the hydrostatic shape of the brain in life, and canals and grooves can preserve features of the circulatory system. multiple samples ar ...201323613315
conservation biology. can captive breeding save mexico's vaquita? 201627516576
passive acoustic monitoring of the decline of mexico's critically endangered vaquita.the vaquita (phocoena sinus) is the world's most endangered marine mammal with approximately 245 individuals remaining in 2008. this species of porpoise is endemic to the northern gulf of california, mexico, and historically the population has declined because of unsustainable bycatch in gillnets. an illegal gillnet fishery for an endangered fish, the totoaba (totoaba macdonaldi), has recently resurged throughout the vaquita's range. the secretive but lucrative wildlife trade with china for toto ...201727338145
indirect effects of conservation policies on the coupled human-natural ecosystem of the upper gulf of california.high bycatch of non-target species and species of conservation concern often drives the implementation of fisheries policies. however, species- or fishery-specific policies may lead to indirect consequences, positive or negative, for other species or fisheries. we use an atlantis ecosystem model of the northern gulf of california to evaluate the effects of fisheries policies directed at reducing bycatch of vaquita (phocoena sinus) on other species of conservation concern, priority target species ...201323691155
exploring trade-offs between fisheries and conservation of the vaquita porpoise (phocoena sinus) using an atlantis ecosystem model.minimizing fishery bycatch threats might involve trade-offs between maintaining viable populations and economic benefits. understanding these trade-offs can help managers reconcile conflicting goals. an example is a set of bycatch reduction measures for the critically endangered vaquita porpoise (phocoena sinus), in the northern gulf of california, mexico. the vaquita is an endemic species threatened with extinction by artisanal net bycatch within its limited range; in this area fisheries are th ...201222916180
assessment of the effect of natural and anthropogenic aquatic noise on vaquita (phocoena sinus) through a numerical simulation. 201222278505
conservation biology. can the vaquita be saved? 200818687936
saving the vaquita: immediate action, not more data. 200718173491
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