Reconstructing historical range and population size of an endangered mollusc: long-term decline of Popenaias popeii in the Rio Grande, Texas

Karatayev, Alexander Y.; Burlakova, Lyubov E.; Miller, Thomas D.; Perrelli, Mary F.

doi:10.1007/s10750-015-2551-3

Cited by 17 publications

(11 citation statements)

References 34 publications

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“…The interaction between mussels and their host fishes was addressed in three papers that evaluate the effects of stress (Douda et al, 2016), cross-immunity (Chowdhury et al, 2017) and temperature (Schneider et al, 2017) on the reproduction of freshwater mussels. Three papers describe distribution patterns with distinct spatial and temporal scales: the population trends of Unionidae in Romania (Sîrbu and Benedek, 2017), the distribution of freshwater mussels and their host fishes in Texas (Dascher et al, 2017) and a study that reconstructs the historical range and population size of the threatened species Popenaias popeii (Karatayev et al, 2015). On a smaller scale, a study on the longitudinal variation in freshwater mussel assemblages within two rivers is presented by Chambers & Woolnough (2016), while Dittman et al (2017) evaluate the microhabitat and biology of the poorly studied pea clam Sphaerium striatinum.…”

Section: The Proceedings Of the Second International Meeting On Biolomentioning

confidence: 99%

Conservation of freshwater bivalves at the global scale: diversity, threats and research needs

et al. 2018

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Bivalves are ubiquitous members of freshwater ecosystems and responsible for important functions and services. The present paper revises freshwater bivalve diversity, conservation status and threats at the global scale and discusses future research needs and management actions. The diversity patterns are uneven across the globe with hotspots in the interior basin in the United States of America (USA), Central America, Indian subcontinent and Southeast Asia. Freshwater bivalves are affected by multiple threats that vary across the globe; however, pollution and natural system (habitat) modifications being consistently found as the most impacting. Freshwater bivalves are among the most threatened groups in the world with 40% of the species being near threatened, threatened or extinct, and among them the order Unionida is the most endangered. We suggest that global cooperation between scientists, managers, politicians and general public, and application of new technologies (new generation sequencing and remote sensing, among others) will strengthen the quality of studies on the natural history and conservation of freshwater bivalves. Finally, we introduce

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Section: The Proceedings Of the Second International Meeting On Biolomentioning

confidence: 99%

Conservation of freshwater bivalves at the global scale: diversity, threats and research needs

et al. 2018

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“…For instance, despite the loss of P. popeii from 75% of its historical range in the Rio Grande, relatively large sections of suitable habitats remain (~15-28 patches, Karatayev et al 2018). However, such constricted populations are particularly vulnerable to further temporary or long-term habitat loss and fragmentation, for example due to dessication during droughts or organic pollution that occur in our study area (Karatayev et al 2018). In these cases, flow restoration places greater importance on protecting existing habitats.…”

Section: When Restoring Peak Flows Might Reduce Local Persistencementioning

confidence: 84%

“…4) in 2011-2012. Previously in this system Karatayev et al (2018) found P. popeii almost exclusively in narrow gaps beneath large sandstone rocks resting atop bedrock. In this study we first searched for these P. popeii habitats, which were found in discrete sections ("patches") along the river; by sampling from an airboat at low water allowed us to easily detect all patches.…”

Section: Case Study: Habitat Distribution Of P Popeiimentioning

confidence: 85%

Advection and habitat loss interactively reduce persistence: maintaining threatened riverine populations while restoring natural flow regimes

Va¹,

Burlakova

et al. 2019

Preprint

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Author contributions: VAK conceived the model and conducted data analysis. VAK and LY analyzed the model. LEB, AYK, and TM conceived and conducted the field study.VAK wrote the manuscript, with substantial input from LEB, AYK, and LY. Abstract:Modification of flow regimes and habitat degradation are the strongest, most common, and often co-occurring human activities affecting riverine populations. Ongoing efforts to restore peak flow events found under pristine flow regimes could increase advection-driven dispersal for many species. In rivers with extensive habitat loss, increased advection could transport individuals from remnant populations into degraded downstream areas, causing restored flow regimes to decrease persistence of threatened species. To resolve the capacity for such 'washout' effects across imperiled taxa, we evaluate population growth in spatial matrix models of insect, fish, and mollusc taxa experiencing advective dispersal and either long-term habitat loss or temporary disturbances. As a case study to quantify advective dispersal in threatened species, we use intensive mark-recapture methods in a Rio Grande population of the federally endangered unionid mussel Texas horhshell (Popenaias popeii). Among unionids, the most threatened freshwater taxa of North America, we find high levels of annual downstream emigration (16-51%) of adult P. popeii, concomitant with strong immigration from upstream habitats. For different taxa experiencing such advective dispersal during specific life stages, our population model shows that washout effects strongly reduce population recovery under high levels of habitat loss. Averting this negative consequence of restoring hydrology requires simultaneously restoring or protecting long, contiguous stretches of suitable habitats. Across taxa in heavily impacted systems, we suggest integrating hydrodynamic studies and field surveys to detect the presence of advective dispersal and prioritize areas for habitat restoration to enhance population persistence.

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“…The skin was shaved, slightly roughened with sandpaper, to remove surface epithelial layers and disinfected. Inter-electrode impedance was checked to be <5 kΩ 23,36…”

Section: Emg Analysismentioning

confidence: 99%

Neuromuscular shoulder activity during exercises with different combinations of stable and unstable weight mass.

Baritello

Khajooei

Engel

et al. 2020

Preprint

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Background:Recent shoulder injury prevention programs have utilized resistance exercises combined with different forms of instability, with the goal of eliciting functional adaptations and thereby reducing the risk of injury. However, it is still unknown how an unstable weight mass affects the muscular activity of the shoulder stabilizers.Aim of the study was to analyze the neuromuscular activity of the dynamic shoulder stabilizers under four conditions of stable and unstable weight mass during three shoulder exercises. It was hypothesized that a combined condition of weight with unstable mass would elicit significantly greater activation due to the increased stabilization demand.MethodsSixteen participants (7 m/9 f) were included in this cross-sectional study and prepared with an EMG-setup for the: Mm. upper/lower trapezius (U.TA/L.TA), lateral deltoid (DE), latissimus dorsi (LD), serratus anterior (SA) and pectoralis major (PE). A maximal voluntary isometric contraction test (MVIC; 5 sec.) was performed on an isokinetic dynamometer. Next, internal/external rotation (In/Ex), abduction/adduction (Ab/Ad) and diagonal flexion/extension (F/E) exercises (5 reps.) were performed with four custom-made-pipes representing different training conditions. First, the empty-pipe (P; 0.5 kg) and then, randomly ordered, water-filled-pipe (PW; 1 kg), weight-pipe (PG; 4.5 kg) and weight + water-filled-pipe (PWG; 4.5 kg), while EMG was recorded. Raw root mean square values (RMS) were normalized to MVIC (%MVIC). Differences between conditions for RMS%MVIC, scapular stabilizer (SR: U.TA/L.TA; U.TA/SA) and contraction (CR: concentric/eccentric) ratios were analyzed (paired t-test; a = 0.05; Bonferroni adjusted a = 0.008) ResultsPWG showed significantly greater muscle activity for all exercises and all muscles except for PE compared to P and PW. Condition PG elicited muscular activity comparable to PWG (p > 0.008) with significantly lower activation of L.TA and SA in the In/Ex rotation. The SR ratio was significantly higher in PWG compared to P and PW. No significant differences were found for the CR ratio in all exercises and for all muscles.ConclusionHigher weight generated greater muscle activation whereas an unstable weight mass behavior raised the neuromuscular activity, increasing the stabilization demands. Especially in the In/Ex rotation, an unstable weight mass increased the RMS%MVIC and SR ratio. This might improve training effects in shoulder prevention and rehabilitation programs.Trial Registration: not applicable

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Reconstructing historical range and population size of an endangered mollusc: long-term decline of Popenaias popeii in the Rio Grande, Texas

Cited by 17 publications

References 34 publications

Conservation of freshwater bivalves at the global scale: diversity, threats and research needs

Conservation of freshwater bivalves at the global scale: diversity, threats and research needs

Advection and habitat loss interactively reduce persistence: maintaining threatened riverine populations while restoring natural flow regimes

Neuromuscular shoulder activity during exercises with different combinations of stable and unstable weight mass.

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